Alloy cable tensile strength testing method and system

Abstract

The invention discloses an alloy cable tensile strength test method and system, and relates to the technical field of cable test.Through continuous execution of steps S1 to S4, under the condition that existing tensile machine hardware conditions are not changed, a baseline output set Out1 can be established, a cyclic output set Out2 can be obtained through cyclic loading, and a final strength set Ufn can be measured after fatigue action; compared with an existing mode which only depends on a single static tensile strength test, the method has the advantages that the strength attenuation law of the alloy cable under the low-amplitude cyclic loading effect can be directly quantified, a strength judgment result which is closer to a long-term service condition is provided, and the fatigue coupling coefficient Fec is obtained through calculation. Not only is the defect that the traditional test cannot simulate strength degradation in practical application solved, but also the residual service capability of the alloy cable is clearly revealed through the fatigue coupling coefficient Fec, so that a scientific and reliable strength evaluation basis is provided for engineering application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable testing, in particular to a kind of alloy cable tensile strength test method and system. BACKGROUND

[0002] Alloy materials are widely used in power, communication and aerospace and many other engineering fields due to their excellent electrical conductivity, mechanical properties and corrosion resistance. In these applications, cables are the core carriers for energy transmission and information transmission, and high-performance wires represented by alloy cables have gradually become an important direction for industry development.

[0003] In the existing alloy cable tensile strength test process, a one-time static tensile test is generally used, that is, the ultimate tensile strength value is obtained by single loading until fracture. Although this method can quickly give the upper limit of the carrying capacity of the cable, it cannot reflect the mechanical evolution process under long-term service conditions. In particular, in actual engineering, alloy cables are often subjected to low-amplitude, multiple-cycle tensile or environmental loads. This cyclic load gradually weakens the internal organizational stability, leading to implicit strength decay. However, the existing test method does not systematically evaluate this fatigue effect, resulting in a significant gap between experimental data and actual service performance. This defect means that the results obtained from a single static tensile test cannot predict the true safety boundary of alloy cables during long-term use. SUMMARY

[0004] To overcome the shortcomings of the prior art, the present application provides an alloy cable tensile strength test method and system, which solves the problems mentioned in the background art.

[0005] To achieve the above purpose, the present application realizes the following technical scheme: an alloy cable tensile strength test method, comprising the following steps: S1, sample grouping and baseline establishment: collect alloy cables of the same batch, construct a sample set Sam, and divide it into a baseline group Bas and a cycle group Cyc for processing according to a random manner, to obtain a baseline output set Out1; S2, low-amplitude cyclic loading configuration and execution: based on the baseline output set Out1, use a tension machine control sequence to establish a cyclic loading configuration set Cfg, and automatically restart the cycle phase of the sample according to the cyclic loading configuration set Cfg until the cycle phase record set Rec meets the stability criterion, to output a cycle output set Out2; S3, determination of ultimate strength after cycling: based on the cycle output set Out2, obtain the cycle group Cyc of low-amplitude cycling, and simultaneously perform a review to obtain a final strength set Ufn; S4, fatigue coupling calculation: based on the initial strength set Uin and the final strength set Ufn, the fatigue coupling coefficient Fec is calculated to generate the alloy cable tensile strength test results.

[0006] Preferably, S1 includes S11; S11, sample grouping and basic environment collection: collect the same batch of alloy cables to build a sample set Sam; divide the sample set Sam into baseline group Bas and cycle group Cyc according to the random principle; The baseline group Bas is collected synchronously under the environmental conditions before loading to obtain the environmental temperature Tmp, the environmental humidity Hum, the loading rate Rat, the clamping stability index Stb, and the original signal set Raw; The environmental temperature Tmp is collected by a temperature sensor arranged in the test environment; The environmental humidity Hum is collected by a humidity sensor placed in the test area; The loading rate Rat is directly read by the control system of the tensile testing machine and recorded by the loading control module during each stretching process; The clamping stability index Stb is monitored by a combination of displacement sensors and force sensors at the tensile testing machine clamp; The original signal set Raw is output by the data acquisition of the alloy cable tensile testing machine, including real-time mechanical curves, electrical signals, displacement signals and related raw data.

[0007] Preferably, S1 also includes S12; S12, single stretching execution and baseline output establishment: using the existing tensile testing machine, the baseline group Bas is stretched one by one until fracture, and the fracture load Fbr is obtained at the moment of fracture; the fracture stress Sig is calculated based on the pre-determined cross-sectional area Are; and the fracture stress Sig is taken as the baseline strength value of the sample; all the fracture stresses Sig of the samples are integrated to form the initial strength set Uin; The clamping stability index Stb is continuously monitored during the stretching process; when the clamping stability index Stb is lower than the preset clamping threshold Thr, an abnormal event set Evt is generated and the corresponding sample is excluded from the initial strength set Uin, and the exclusion process is repeated until there is no sample to be excluded, forming the initial strength set Uin, and simultaneously assigning a unique sample identifier Sid to all samples in the initial strength set Uin; The initial strength set Uin is integrated with the environmental temperature Tmp, the environmental humidity Hum, the loading rate Rat, and the clamping stability index Stb to output the baseline output set Out1 = {initial strength set Uin, environmental temperature Tmp, environmental humidity Hum, loading rate Rat, clamping stability index Stb}.

[0008] Preferably, the S2 comprises S21; The S21, the cyclic loading configuration is established and the environment consistency is checked: based on the initial intensity set Uin, the environment temperature Tmp, the environment humidity Hum and the loading rate Rat recorded in the baseline output set Out1, the cyclic loading configuration set Cfg is established; in the cyclic loading configuration set Cfg, the cyclic amplitude coefficient Caf, the cycle number Cnt, the cyclic holding time Hol and the cyclic intermittent time Rst are determined; The determination method of the cyclic amplitude coefficient Caf is as follows: The average value of all samples is calculated from the initial intensity set Uin to obtain the average breaking stress Sav; the cable test of 20% of the average breaking stress Sav is set as a fixed proportion, and is set as the cyclic amplitude coefficient Caf; The cycle number Cnt is calculated and obtained according to the loading rate Rat and the average value of the initial intensity set Uin, the average breaking stress Sav; the loading rate Rat is set as the cable test R, and the cycle number Cnt is obtained through the formula Cnt= (K×Sav) / R; The cyclic holding time Hol is set based on the environment temperature Tmp and the environment humidity Hum, and the specific calculation formula is as follows: Hol=T0×{1+((|Tmp-25|) / 25+)(Hum / 100)}; Wherein, T0 is the cable test of the baseline holding time; The cyclic intermittent time Rst is determined according to the environment temperature Tmp and the clamping stability index Stb, and the calculation formula of the cyclic intermittent time Rst is as follows: Rst=R0×{1+(T / 50)+(1-S) / 50}; Wherein, R0 is the cable test of the baseline intermittent time; After the configuration is completed, the environment temperature Tmp, the environment humidity Hum and the loading rate Rat are checked for consistency: if the conditions to be executed deviate from the allowable range recorded in the baseline output set Out1, the scheduling of the cyclic holding time Hol and the cyclic intermittent time Rst in the cyclic loading configuration set Cfg is adjusted to avoid the abnormal period, until the environment and the loading conditions meet the consistency requirements, and then the cyclic loading configuration set Cfg for driving subsequent cyclic execution is formed; The allowable range includes the temperature allowable interval Twd, the humidity allowable interval Hwd and the rate allowable interval Rwd; The temperature allowable interval Twd is set to ambient temperature Tmp±2; the humidity allowable interval Hwd is set to ±5; and the rate allowable interval Rwd is set to ±5%.

[0009] Preferably, the S2 further comprises S22. The S22 applies low-amplitude cyclic loading to each sample in the cyclic group Cyc one by one according to the parameter settings of the cyclic loading configuration set Cfg; during the cyclic loading process, the cyclic stage record set Rec and the raw signal set Raw are collected and recorded in real time, and the clamping stability indicator Stb is continuously monitored; When the clamping stability indicator Stb is monitored to decrease by more than 20% of the initial value of the cable test, or the stress difference between adjacent two samples in the raw signal set Raw is more than 15% of the average breaking stress Sav of the cable test, an abnormal event set Evt is generated; And the cyclic process of the current sample is automatically restarted, and the parameter settings in the cyclic loading configuration set Cfg are kept unchanged during the restart; In a complete cyclic stage, when the cyclic stage record set Rec meets the cyclic determination condition, it is determined that the cyclic loading is effective; Wherein, the stress value represents the instantaneous stress value obtained by converting the instantaneous load F(t) collected at a fixed frequency during the loading process of the tensile testing machine through the sample cross-sectional area Are; After completing the cyclic loading of all samples, the cyclic amplitude coefficient Caf, the cyclic number Cnt and the cyclic stage record set Rec that are confirmed to be effective are integrated and output as the cyclic output set Out2={cyclic amplitude coefficient Caf, cyclic number Cnt, cyclic stage record set Rec}.

[0010] Preferably, the cyclic determination condition is as follows: Cyclic determination condition one: during the cyclic loading process, the absolute value of the deviation of any sampling stress value from the cyclic average stress Sigm does not exceed ±10% of the cable test of the cyclic average stress Sigm; Cyclic determination condition two: the clamping stability indicator Stb remains no less than 85% of the initial value of the cable test during the entire cyclic process; Cyclic determination condition three: in the raw signal set Raw, the stress difference between adjacent two samples does not exceed 10% of the cable test of the cyclic average stress Sigm; Cyclic determination condition four: environmental parameter constraint: the ambient temperature Tmp is kept within the range of ±2℃ recorded in the baseline output set Out1, and the ambient humidity Hum is kept within the range of ±5% of the cable test recorded in the baseline output set Out1.

[0011] Preferably, the S3 comprises S31. S31, in the cycle group Cyc after completing the low-amplitude cyclic loading, a single tensile test until fracture is performed on each sample one by one; the fracture load Fbr is collected at the moment of fracture, and the fracture stress Sig is converted based on the pre-determined cross-sectional area Are; the fracture stress Sig is taken as the final strength value of the sample, and the final strength values of all samples are integrated to form a final strength set Ufn.

[0012] Preferably, the S3 further comprises S32; S32, while completing the final strength set Ufn acquisition, the environmental temperature Tmp, the environmental humidity Hum and the loading rate Rat during the fracture determination process of each sample are reviewed for consistency; if all three fall within the allowed range set defined by the previous baseline output set Out1, the fracture stress Sig corresponding to the sample is determined as a valid result, and continues to be retained in the final strength set Ufn; if any parameter deviates from the allowed range set Alw, the sample is marked into the abnormal event set Evt, and the low-amplitude cyclic loading and single tensile test until fracture are re-performed according to the corresponding cyclic loading configuration set Cfg in the cycle output set Out2, until a valid fracture stress Sig that meets the conditions is obtained.

[0013] Preferably, the S4 comprises S41; S41, based on the initial strength set Uin and the final strength set Ufn, for each sample, the fatigue coupling coefficient Fec of the sample is defined, which quantifies the ratio of the fracture stress in the final strength set Ufn to the fracture stress in the initial strength set Uin; When the fatigue coupling coefficient Fec is greater than or equal to 0.8, it indicates that the strength attenuation of the sample after cyclic loading is small, and it is determined that the alloy cable after the tensile strength test meets the long-term service safety requirements of the project under actual service conditions; When the fatigue coupling coefficient Fec is less than 0.8, it indicates that the strength attenuation of the sample after cyclic loading is significant, and it is determined that the alloy cable after the tensile strength test does not meet the long-term service safety requirements of the project under actual service conditions; The fatigue coupling coefficients Fec of all samples are integrated to form a fatigue coupling result set Res, which is indexed according to the sample identification Sid, and has a corresponding relationship with the cyclic amplitude coefficient Caf and the cycle number Cnt in the cycle output set Out2.

[0014] An alloy cable tensile strength test system, comprising a cable grouping module, a cable cycle configuration and execution module, a cable test module and a cable strength determination module; The cable grouping module collects alloy cables of the same batch, constructs a sample set Sam, and divides them into a baseline group Bas and a cycle group Cyc for processing according to a random manner, to obtain a baseline output set Out1; The cable cycle configuration and execution module establishes a cycle loading configuration set Cfg based on the baseline output set Out1 using a tension machine control sequence, and automatically restarts the cycle phase of the sample according to the cycle loading configuration set Cfg until the cycle phase record set Rec meets the stability criterion, and outputs a cycle output set Out2; The cable test module obtains a cycle group Cyc of the low-amplitude cycle based on the cycle output set Out2, synchronously performs rechecking, and obtains a final strength set Ufn; The cable strength determination module calculates a fatigue coupling coefficient Fec based on the initial strength set Uin and the final strength set Ufn, and generates a tensile strength test result of the alloy cable.

[0015] The application provides a tensile strength test method and system of an alloy cable, which has the following beneficial effects: (1) Through the continuous execution of steps S1 to S4, the baseline output set Out1 can be established without changing the existing tension machine hardware conditions, the cycle output set Out2 can be obtained through cycle loading, the final strength set Ufn can be measured after fatigue, and the initial strength set Uin is compared to further calculate the fatigue coupling coefficient Fec. Compared with the existing method of only relying on single static tensile strength test, the method can directly quantify the strength attenuation law of the alloy cable under the action of low-amplitude cycle loading, and provide a strength determination result closer to the long-term service condition. Therefore, the defects of the traditional test that cannot simulate the strength degradation in actual application are solved, and the residual service ability of the alloy cable is clearly revealed through the fatigue coupling coefficient Fec, thereby providing a scientific and reliable strength evaluation basis for engineering application.

[0016] (2) The cycle loading configuration set Cfg is established based on the parameters of the baseline output set Out1, and the quantitative setting of the cycle amplitude coefficient Caf, the cycle number Cnt, the cycle holding time Hol and the cycle intermittent time Rst is combined to realize the repeatable execution and dynamic correction of the low-amplitude cycle loading, thereby avoiding the deviation caused by environmental extremization, realizing the automatic identification and elimination of non-real fatigue effects such as fixture slip and instantaneous abnormal impact, and ensuring the data continuity and authenticity of the results.

[0017] (3) In the cycle group Cyc after completing the low-amplitude cycle loading, the final strength set Ufn is collected, and the initial strength set Uin is combined to form a complete comparison of the strengths before and after service, so that the residual tensile capacity of the alloy cable under the simulated service condition is directly quantified, which not only makes up for the defects of the traditional single tensile method that cannot reflect the strength state after service fatigue, but also provides a verifiable strength reference for the service life of the cable under different environments and working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1A schematic diagram of steps of a tensile strength test method for an alloy cable according to the present application; Figure 2 A block diagram schematic of a tensile strength test system for an alloy cable according to the present application; Figure 3 A schematic diagram of a fatigue coupling coefficient Fec broken line. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application. EMBODIMENT

[0020] The present application provides a tensile strength test method for an alloy cable, please refer to Figure 1 , comprising the following steps: S1, sample grouping and baseline establishment: collect alloy cables of the same batch, construct a sample set Sam, and divide them into a baseline group Bas and a cycle group Cyc for processing according to a random manner, and obtain a baseline output set Out1; S2, low-amplitude cyclic loading configuration and execution: based on the baseline output set Out1, use a tension machine control sequence to establish a cyclic loading configuration set Cfg, and automatically restart the cyclic phase of the sample according to the cyclic loading configuration set Cfg until the cyclic phase record set Rec meets the stability criterion, and output a cyclic output set Out2; S3, post-cyclic ultimate strength determination: based on the cyclic output set Out2, obtain the cycle group Cyc of the low-amplitude cycle, and simultaneously perform a review to obtain a final strength set Ufn; S4, fatigue coupling calculation: based on the initial strength set Uin and the final strength set Ufn, calculate the fatigue coupling coefficient Fec to generate the tensile strength test result of the alloy cable.

[0021] In this embodiment, through the continuous execution of steps S1 to S4, the baseline output set Out1 can be established without changing the existing tensile machine hardware conditions, the cyclic output set Out2 is obtained through cyclic loading, the final strength set Ufn is measured after fatigue action, and is compared with the initial strength set Uin, and the fatigue coupling coefficient Fec is further calculated. Compared with the existing method which only relies on single static tensile strength test, the present method can directly quantify the strength attenuation law of the alloy cable under low-amplitude cyclic loading, and provide strength determination results closer to long-term service conditions. Thus, not only the defect that the traditional test cannot simulate the strength degradation in actual application is solved, but also the residual service capacity of the alloy cable is clearly revealed through the fatigue coupling coefficient Fec, thereby providing a scientific and reliable strength evaluation basis for engineering application. Embodiment

[0022] Specifically, the S1 comprises an S11. The S11 comprises sample grouping and basic environment collection: collecting alloy cables of the same batch to build a sample set Sam; dividing the sample set Sam into a baseline group Bas and a cyclic group Cyc according to a random principle; The baseline group Bas is subjected to synchronous collection of environmental conditions before loading to obtain environmental temperature Tmp, environmental humidity Hum, loading rate Rat, and clamping stability index Stb, and an original signal set Raw; The environmental temperature Tmp is collected by a temperature sensor arranged in the test environment, the sensor is connected with the environmental control system of the tensile machine, and can record the temperature value in the laboratory or test space in real time; used for reflecting the influence of external environmental temperature on the performance of the alloy cable during the test, ensuring that the subsequent strength data correspond to the environmental temperature one by one; used for eliminating abnormal results caused by temperature deviation in subsequent fatigue coupling calculation; The environmental humidity Hum is collected by a humidity sensor placed in the test area, and the humidity sensor is in real-time linkage with the data acquisition system; humidity can affect the friction coefficient and possible corrosion reaction of the alloy surface, and has a direct influence on the repeatability of the strength test; therefore, the purpose of collecting the environmental humidity Hum is to establish the baseline condition and serve as a subsequent data comparison; The loading rate Rat is directly read from the control system of the tensile machine and is recorded by the loading control module in each tensile process; the loading rate Rat can significantly affect the strength performance of the material (faster loading shows more brittleness, and slower loading shows more ductility); therefore, the purpose of collecting the loading rate Rat is to ensure the standardization of the experimental process and serve as a correction parameter for the strength data; The clamping stability index Stb is monitored by a combination of displacement sensors and force sensors at the tensile machine clamp, and the system automatically calculates the clamping slip rate and load transfer stability to form a stability index; for determining whether the sample is clamped stably, to avoid the non-real fracture phenomenon caused by clamp slipping, offsetting, etc.; the purpose is to perform data quality control in the initial strength set Uin formation process; The raw signal set Raw is output by the data acquisition of the alloy cable tensile machine, including real-time mechanical curve, electrical signal, displacement signal and related raw data; as the basis for subsequent data analysis and abnormal comparison, if the clamping stability index Stb triggers an exception, the raw signal set Raw can be reviewed and traced to ensure that the rejected samples indeed have problems.

[0023] The S1 further includes S12; S12, single stretching execution and baseline output establishment: using the existing tensile machine to perform single stretching on the baseline group Bas one by one until fracture, obtaining the fracture load Fbr at the moment of fracture; calculating the fracture stress Sig based on the pre-determined cross-sectional area Are (obtained by converting the geometric size of the sample gauge section); and taking the fracture stress Sig as the baseline strength value of the sample; integrating the fracture stresses Sig of all samples to form the initial strength set Uin; The clamping stability index Stb is continuously monitored during the stretching process; when the clamping stability index Stb is lower than the preset clamping threshold Thr, an abnormal event set Evt is generated and the corresponding sample is removed from the initial strength set Uin, and the removal process is repeated until there is no sample to be removed, forming an effective initial strength set Uin, and simultaneously assigning a unique sample identifier Sid to all samples in the initial strength set Uin; The initial strength set Uin is integrated with the environmental temperature Tmp, the environmental humidity Hum, the loading rate Rat, and the clamping stability index Stb, and the baseline output set Out1 = {initial strength set Uin, environmental temperature Tmp, environmental humidity Hum, loading rate Rat, clamping stability index Stb} is output.

[0024] In this embodiment, through the execution of step S1, the present application not only obtains the initial strength set Uin as a reference for subsequent fatigue determination, but also synchronously collects and checks the environmental temperature Tmp, the environmental humidity Hum, the loading rate Rat and the clamping stability index Stb at the initial stage of the test, and traces the abnormality in combination with the original signal set Raw, so as to ensure the effectiveness and comparability of the data at the source. Specifically, the collection of the environmental humidity Hum avoids the strength deviation caused by the corrosion of the metal surface in a high-humidity area (such as a coastal power transmission line or an underground cable trench); the introduction of the loading rate Rat ensures that the material performance difference in a fast-charging electric vehicle power cable or a high-frequency vibration environment is truly reflected, rather than false strength mixed with rate effect; and the setting of the clamping stability index Stb avoids the non-real fracture data caused by the slipping of the clamp, and ensures that the initial strength set Uin is completely derived from the mechanical properties of the sample itself. The final output baseline output set Out1={initial strength set Uin, environmental temperature Tmp, environmental humidity Hum, loading rate Rat, clamping stability index Stb} provides standardized and traceable basic conditions for subsequent low-amplitude cyclic loading and fatigue coupling calculation, so that the test results can maintain consistency between different batches and different environments. Embodiment

[0025] Specifically: the S2 comprises S21; S21, cyclic loading configuration establishment and environmental consistency check: based on the initial strength set Uin, the environmental temperature Tmp, the environmental humidity Hum and the loading rate Rat recorded in the baseline output set Out1, the cyclic loading configuration set Cfg is established without changing the hardware; in the cyclic loading configuration set Cfg, the cyclic amplitude coefficient Caf, the cycle number Cnt, the cycle holding time Hol and the cycle intermittent time Rst are determined; The determination method of the cyclic amplitude coefficient Caf is as follows: The average value of all samples is calculated from the initial strength set Uin to obtain the average fracture stress Sav; the cable test of 20% of the average fracture stress Sav is set as the fixed proportion of the cyclic amplitude coefficient Caf; by directly taking the fixed proportion of the average strength, the cyclic amplitude coefficient Caf can not only represent the overall strength level, but also ensure that all samples are loaded under low-amplitude stress to avoid premature fracture, and the purpose is to construct a low-amplitude fatigue loading reference under long-term service conditions; The cycle number Cnt is calculated according to the average fracture stress Sav of the loading rate Rat and the average value of the initial intensity set Uin; the cycle number Cnt is obtained by the formula Cnt=(K×Sav) / R, wherein the loading rate Rat is the cable test R; the higher the loading rate Rat, the smaller the cycle number Cnt, so as to avoid too fast accumulation of fatigue damage; otherwise, at a lower rate, the cycle number Cnt is larger, so as to ensure the accumulation of fatigue effect, and the purpose is to ensure that the cycle conditions of each sample are comparable in quantity through the explicit calculation rule; The cycle holding time Hol is set based on the ambient temperature Tmp and the ambient humidity Hum, and the specific calculation formula is as follows: Hol=T0×{1+((|Tmp-25|) / 25+)(Hum / 100)}; Wherein, T0 is the reference holding time of the cable test, preferably 5 seconds; when the ambient temperature Tmp deviates from the normal temperature or the ambient humidity Hum is high, the formula automatically prolongs the holding time, so as to ensure that the stress is fully transmitted in the sample; the purpose is to compensate the interference of environmental factors on the loading curve through the holding time without changing the hardware; The cycle intermittent time Rst is determined according to the ambient temperature Tmp and the clamping stability index Stb, and the calculation formula of the cycle intermittent time Rst is as follows: Rst=R0×{1+(T / 50)+(1-S) / 50}; Wherein, R0 is the reference intermittent time of the cable test, preferably 3 seconds; when the ambient temperature Tmp rises or the clamping stability index Stb is lower than the stable range, the cycle intermittent time Rst is automatically increased, which provides a buffer for the sample and the equipment, and the purpose is to keep the consistency of the loading conditions between different cycles, and improve the effectiveness and repeatability of the cycle stage record set Rec; After the configuration is completed, the consistency of the ambient temperature Tmp, the ambient humidity Hum and the loading rate Rat is checked: if the conditions to be executed deviate from the allowed range of the baseline output set Out1 record, the scheduling of the cycle holding time Hol and the cycle intermittent time Rst in the cycle loading configuration set Cfg is adjusted to avoid the abnormal period, until the environment and the loading conditions meet the consistency requirements, and then the cycle loading configuration set Cfg for driving subsequent cycle execution is formed; The allowed range includes the temperature allowed interval Twd, the humidity allowed interval Hwd and the rate allowed interval Rwd; The temperature allowed interval Twd is set to ambient temperature Tmp±2; the humidity allowed interval Hwd is set to ±5; and the rate allowed interval Rwd is set to ±5%. When the environmental temperature Tmp at the execution time is in the temperature allowable interval Twd, the environmental humidity Hum is in the humidity allowable interval Hwd, and the loading rate Rat is in the rate allowable interval Rwd, it is determined that the consistency is passed.

[0026] The S2 further comprises S22; S22, according to the setting of the cyclic loading configuration set Cfg, the low-amplitude cyclic loading is applied to each sample in the cyclic group Cyc one by one; during the cyclic loading process, the cyclic stage record set Rec and the original signal set Raw are collected and recorded in real time, and the clamping stability index Stb is continuously monitored; When the clamping stability index Stb is monitored to drop by more than 20% of the initial value of the cable test, or the stress difference between adjacent two samples in the original signal set Raw is more than 15% of the average breaking stress Sav of the cable test, the abnormal event set Evt is generated; And the cyclic process of the current sample is automatically restarted, and the parameter setting in the cyclic loading configuration set Cfg is kept unchanged during the restart; In a complete cyclic stage, when the cyclic stage record set Rec meets the cyclic determination condition, it is determined that the cyclic loading is effective; It should be noted that: in the cyclic loading process of the present application, the stress is obtained based on the conversion result of the load borne by the sample and the cross-sectional area of the sample, and the specific definition is as follows: It should be noted that: in the cyclic loading process of the present application, the stress is obtained based on the conversion result of the load borne by the sample and the cross-sectional area of the sample, and the specific definition is as follows: During the cyclic loading process, the data acquisition system of the tension machine obtains the instantaneous load F(t) at a fixed sampling frequency, and obtains the instantaneous stress based on the cross-sectional area Are of the sample, which is defined as the stress value cable test Sig(t); Wherein, the instantaneous load F(t) is derived from the original signal set Raw, the cross-sectional area Are is derived from the geometric size of the sample determined in advance, and the stress value cable test Sig(t) is the basis quantity of the cyclic loading determination condition and the abnormal determination condition; The cyclic average stress cable test Sigm represents that in a complete cyclic stage, the stress value cable test Sig(t) in the cycle is taken as an arithmetic average, which is defined as the average stress of the cycle, and is recorded as the cyclic average stress cable test Sigm; The stress difference value cable test ΔSig represents the absolute value of the difference between the stress value cable test Sig(t) of adjacent two samples in the original signal set Raw, which is defined as the stress difference value cable test ΔSig; The average breaking stress Sav represents a statistical value obtained by taking an arithmetic average of all breaking stresses Sig of the initial strength set Uin in the baseline output set Out1; After completing the cyclic loading of all samples, the valid cyclic amplitude coefficient Caf, the cycle number Cnt and the cycle phase record set Rec are integrated to output the cycle output set Out2 = {cyclic amplitude coefficient Caf, cycle number Cnt, cycle phase record set Rec}, and the abnormal event set Evt is kept as a whole process trace record.

[0027] The cycle determination condition is specifically as follows: Cycle determination condition one: during the cyclic loading process, the absolute value of the deviation of any sampling stress value from the cyclic average stress Sigm does not exceed the cable test ±10% of the cyclic average stress Sigm; Cycle determination condition two: the clamping stability index Stb remains not less than 85% of the initial value during the entire cycle process; Cycle determination condition three: in the original signal set Raw, the stress difference between the adjacent two samplings does not exceed 10% of the cable test of the cyclic average stress Sigm; Cycle determination condition four: environmental parameter constraint: the environmental temperature Tmp is kept within the ±2℃ range recorded in the baseline output set Out1, and the environmental humidity Hum is kept within the ±5% cable test range recorded in the baseline output set Out1.

[0028] In this embodiment, the cyclic loading configuration set Cfg is established based on the parameters of the baseline output set Out1, and the quantization settings of the cyclic amplitude coefficient Caf, the cyclic number Cnt, the cyclic holding time Hol, and the cyclic rest time Rst are combined to realize the repeatable execution and dynamic correction of low-amplitude cyclic loading. In this way, the fatigue loading conditions of each sample not only match the initial strength level, but also can obtain consistent loading curves under different environmental fluctuation conditions (such as summer high temperature exceeding 35°C or underground tunnel humidity close to 90%) by automatically adjusting the cyclic holding time Hol and the cyclic rest time Rst, thereby avoiding deviations caused by environmental extremes. Further, in the cyclic loading process, the real-time collected cyclic phase record set Rec is combined with the original signal set Raw, and the continuous monitoring of the clamping stability index Stb is combined to realize the automatic identification and elimination of non-real fatigue effects such as clamp slipping and instantaneous abnormal impact. For example, in the high-frequency acceleration and deceleration scene of an electric vehicle, if the stress jump caused by sample loosening in a loading process exceeds 15% of the average fracture stress Sav, the method can immediately generate an abnormal event set Evt and automatically restart the cyclic phase of the sample, ensuring data continuity and the authenticity of the results. The final cyclic output set Out2 not only ensures the stability and repeatability of the fatigue loading stage, but also provides an effective cyclic loading reference under real service environment for subsequent fatigue coupling calculation. Embodiment

[0029] Please refer to Figure 1 and Figure 3 , specifically: the S3 includes S31; S31, in the cyclic group Cyc after completing the low-amplitude cyclic loading, a single tensile test is performed on each sample until fracture; the fracture load Fbr is collected at the moment of fracture, and the fracture stress Sig is converted based on the pre-determined cross-sectional area Are; the fracture stress Sig is taken as the final strength value of the sample, and the final strength values of all samples are integrated to form the final strength set Ufn; It should be noted that: the initial strength set Uin is obtained by the cable test of step cable test S1-2 single tensile execution and baseline output establishment cable test, and the test object is the baseline group Bas sample without any cyclic loading; its purpose is to reflect the tensile strength characteristics of the material in the initial state; The final strength set Ufn is obtained by the cable test of step cable test S3 cable test post-cyclic ultimate strength determination cable test, and the test object is the cyclic group Cyc sample that has completed low-amplitude cyclic loading; its purpose is to reflect the remaining tensile strength level of the material under the action of simulated service fatigue working conditions.

[0030] The S3 further includes S32; S32, while completing the final strength set Ufn acquisition, the environmental temperature Tmp, environmental humidity Hum and loading rate Rat of each sample in the fracture determination process are reviewed for consistency; if all three fall within the allowed range set defined by the preceding baseline output set Out1, the fracture stress Sig of the sample corresponding to the sample is determined to be a valid result, and continues to be retained in the final strength set Ufn; if any parameter deviates from the allowed range set Alw, the sample is marked into the abnormal event set Evt, and the low-amplitude cyclic loading and single stretching until fracture are re-executed according to the corresponding cyclic loading configuration set Cfg in the cyclic output set Out2 until the valid fracture stress Sig that meets the conditions is obtained.

[0031] The S4 includes S41; S41, based on the initial strength set Uin and the final strength set Ufn, for each sample, define the fatigue coupling coefficient Fec of the sample, which quantifies the ratio of the fracture stress in the final strength set Ufn to the fracture stress in the initial strength set Uin; When the fatigue coupling coefficient Fec is greater than or equal to 0.8, it indicates that the strength of the sample after cyclic loading is less attenuated, and it is determined that the alloy cable after the tensile strength test meets the long-term service safety requirements of the project under actual service conditions; When the fatigue coupling coefficient Fec is less than 0.8, it indicates that the strength of the sample after cyclic loading is significantly attenuated, and it is determined that the alloy cable after the tensile strength test does not meet the long-term service safety requirements of the project under actual service conditions; Integrate the fatigue coupling coefficients Fec of all samples to form the fatigue coupling result set Res, which is indexed by the sample identifier Sid, and corresponds to the cyclic amplitude coefficient Caf and the number of cycles Cnt in the cyclic output set Out2 to support subsequent consistency review and result tracing.

[0032] In this embodiment, in the cycle group Cyc after completing the low-amplitude cyclic loading, the final strength set Ufn is collected, and the initial strength set Uin is combined to form a complete comparison of the strength before and after service. Unlike the prior art which only relies on single fracture stress determination, the method directly quantifies the residual tensile capacity of the alloy cable under simulated service conditions through the establishment of the final strength set Ufn. For example, after the high-speed rail catenary alloy cable experiences millions of times of small-amplitude load cycles, fatigue cracks may be generated on the surface of the cable. The method can reflect the real attenuation range of the fracture strength through the final strength set Ufn, and eliminate abnormal data caused by fluctuations in temperature and humidity or deviation of the loading rate Rat. For another example, the power transmission alloy cable arranged inside the wind power tower operates in an environment where the humidity is always more than 80%. The method can ensure that the final strength set Ufn output accurately represents the residual strength level of the cable under long-term service conditions through the linkage retest of the abnormal event set Evt and the cyclic loading configuration set Cfg. Thus, the present application not only makes up for the defect that the traditional single tensile method cannot reflect the strength state after service fatigue, but also provides a verifiable strength reference for the service life of the cable under different environments and conditions. Embodiment

[0033] An alloy cable tensile strength test system, please refer to Figure 2 , specifically: including cable grouping module, cable cycle configuration and execution module, cable test module and cable strength determination module; The cable grouping module collects alloy cables of the same batch, constructs a sample set Sam, and divides them into baseline group Bas and cycle group Cyc for processing according to a random manner, to obtain baseline output set Out1; The cable cycle configuration and execution module uses a tension machine control sequence to establish a cyclic loading configuration set Cfg based on the baseline output set Out1, and automatically restarts the cycle phase of the sample according to the cyclic loading configuration set Cfg until the cycle phase record set Rec meets the stability criterion, to output a cycle output set Out2; The cable test module obtains the cycle group Cyc of the low-amplitude cycle based on the cycle output set Out2, and synchronously performs retest to obtain a final strength set Ufn; The cable strength determination module calculates a fatigue coupling coefficient Fec based on the initial strength set Uin and the final strength set Ufn, to generate the alloy cable tensile strength test result.

[0034] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method of testing the tensile strength of an alloy wire, characterized by: Comprising the following steps: S1, sample grouping and baseline establishment: collect alloy cables of the same batch, construct a sample set Sam, and divide them into a baseline group Bas and a cycle group Cyc in a random manner for processing to obtain a baseline output set Out1; S2, low-amplitude cyclic loading configuration and execution: based on the baseline output set Out1, use the tension machine control sequence to establish a cyclic loading configuration set Cfg, and automatically restart the cyclic phase of the sample according to the cyclic loading configuration set Cfg until the cycle phase record set Rec meets the stability criterion, and output the cycle output set Out2; S3, post-cycle ultimate strength determination: based on the cycle output set Out2, obtain the cycle group Cyc of the low-amplitude cycle, and simultaneously perform a review to obtain a final strength set Ufn; S4, fatigue coupling calculation: based on the initial strength set Uin and the final strength set Ufn, calculate the fatigue coupling coefficient Fec to generate the tensile strength test results of the alloy cable.

2. A method of testing the tensile strength of an alloy wire cable according to claim 1, characterized in that: The S1 comprises S11; S11, sample grouping and basic environment collection: collect alloy cables of the same batch to construct a sample set Sam; divide the sample set Sam into a baseline group Bas and a cycle group Cyc according to the random principle; Synchronously collect the environmental temperature Tmp, the environmental humidity Hum, the loading rate Rat, and the clamping stability index Stb, and the original signal set Raw of the baseline group Bas before loading; The environmental temperature Tmp is collected by a temperature sensor arranged in the test environment; The environmental humidity Hum is collected by a humidity sensor placed in the test area; The loading rate Rat is directly read by the control system of the tension machine and recorded by the loading control module during each stretching process; The clamping stability index Stb is monitored by a combination of displacement sensors and force sensors at the clamps of the tension machine; The original signal set Raw is output by the data acquisition of the alloy cable tensile machine, including real-time mechanical curves, electrical signals, displacement signals, and related raw and unprocessed data.

3. A method of testing the tensile strength of an alloy wire cable according to claim 2, wherein: The S1 further comprises S12; S12, single stretching execution and baseline output establishment: use the existing tension machine to perform single stretching on the baseline group Bas one by one until fracture, and at the moment of fracture, obtain the fracture load Fbr; calculate the fracture stress Sig based on the pre-determined cross-sectional area Are; and take the fracture stress Sig as the baseline strength value of the sample; integrate the fracture stresses Sig of all samples to form an initial strength set Uin; During the stretching process, the clamping stability index Stb is continuously monitored; when the clamping stability index Stb is lower than the preset clamping threshold Thr, an abnormal event set Evt is generated and the corresponding sample is excluded from the initial strength set Uin, and the exclusion process is repeated until there is no sample to be excluded, forming the initial strength set Uin, and simultaneously assigning a unique sample identifier Sid to all samples in the initial strength set Uin; The initial strength set Uin is integrated with the environmental temperature Tmp, the environmental humidity Hum, the loading rate Rat and the clamping stability index Stb, and a baseline output set Out1 is output, Out1={initial strength set Uin, environmental temperature Tmp, environmental humidity Hum, loading rate Rat, clamping stability index Stb}.

4. A method of testing the tensile strength of an alloy wire according to claim 3, wherein: The S2 comprises an S21. The S21 comprises a cyclic loading configuration establishment and environmental consistency check: based on the initial strength set Uin, the environmental temperature Tmp, the environmental humidity Hum and the loading rate Rat recorded in the baseline output set Out1, a cyclic loading configuration set Cfg is established; in the cyclic loading configuration set Cfg, the cyclic amplitude coefficient Caf, the cyclic number Cnt, the cyclic holding time Hol and the cyclic intermittent time Rst are determined; The determination method of the cyclic amplitude coefficient Caf is as follows: The average value of all samples is calculated from the initial strength set Uin to obtain the average breaking stress Sav; the cable test of 20% of the average breaking stress Sav is set as a fixed proportion, and is set as the cyclic amplitude coefficient Caf; The cyclic number Cnt is calculated and obtained according to the loading rate Rat and the average value of the initial strength set Uin, the average breaking stress Sav; the loading rate Rat is set as the cable test R, and the cyclic number Cnt is obtained through the formula Cnt=(K×Sav) / R; The cyclic holding time Hol is set based on the environmental temperature Tmp and the environmental humidity Hum, and the specific calculation formula is as follows: Hol=T0×{1+((|Tmp-25|) / 25+)(Hum / 100)}; Wherein, T0 is the cable test of the reference holding time; The cyclic intermittent time Rst is determined according to the environmental temperature Tmp and the clamping stability index Stb, and the calculation formula of the cyclic intermittent time Rst is as follows: Rst=R0×{1+(T / 50)+(1-S) / 50}; Wherein, R0 is the cable test of the reference intermittent time; After the configuration is completed, the environmental temperature Tmp, the environmental humidity Hum and the loading rate Rat are checked for consistency: if the conditions to be executed deviate from the allowed range recorded in the baseline output set Out1, the scheduling of the cyclic holding time Hol and the cyclic intermittent time Rst in the cyclic loading configuration set Cfg is adjusted to avoid the abnormal period, until the environmental and loading conditions meet the consistency requirements, and then the cyclic loading configuration set Cfg for driving subsequent cyclic execution is formed; The allowed range includes the temperature allowed interval Twd, the humidity allowed interval Hwd and the rate allowed interval Rwd; The temperature allowed interval Twd is set as the environmental temperature Tmp±2; the humidity allowed interval Hwd is set as ±5; and the rate allowed interval Rwd is set as ±5%.

5. A method of testing the tensile strength of an alloy wire cable according to claim 4, wherein: The S2 further comprises an S22. S22, according to the setting of the cyclic loading configuration set Cfg, low-amplitude cyclic loading is applied to each sample in the cyclic group Cyc one by one; during the cyclic loading process, the cyclic stage record set Rec and the original signal set Raw are collected and recorded in real time, and the clamping stability index Stb is continuously monitored; When the clamping stability index Stb is monitored to drop by more than 20% of the initial value of the cable test, or the stress difference between adjacent two samples in the original signal set Raw is more than 15% of the average breaking stress Sav of the cable test, an abnormal event set Evt is generated; And automatically restart the cyclic process of the current sample, keep the parameter setting in the cyclic loading configuration set Cfg unchanged when restarting; In a complete cyclic stage, when the cyclic stage record set Rec meets the cyclic determination condition, it is determined that the cyclic loading is effective; Wherein, the stress value represents the instantaneous load F(t) collected at a fixed frequency during the loading process of the tensile testing machine, and the instantaneous stress value converted by the sample cross-sectional area Are; After completing the cyclic loading of all samples, the effective cyclic amplitude coefficient Caf, the cyclic number Cnt and the cyclic stage record set Rec are integrated, and the output is the cyclic output set Out2={cyclic amplitude coefficient Caf, cyclic number Cnt, cyclic stage record set Rec}.

6. A method of testing the tensile strength of an alloy wire cable according to claim 5, wherein: The cyclic determination condition is as follows: Cyclic determination condition one: during the cyclic loading process, the absolute value of the deviation of any sampling stress value from the cyclic average stress Sigm is not more than ±10% of the cyclic average stress Sigm; Cyclic determination condition two: the clamping stability index Stb remains not less than 85% of the initial value of the cable test during the entire cyclic process; Cyclic determination condition three: in the original signal set Raw, the stress difference between adjacent two samples is not more than 10% of the cyclic average stress Sigm; Cyclic determination condition four: environmental parameter constraint: the environmental temperature Tmp is kept within ±2℃ of the baseline output set Out1 record, and the environmental humidity Hum is kept within ±5% of the baseline output set Out1 record.

7. A method of testing the tensile strength of an alloy wire cable according to claim 6, wherein: The S3 includes S31; S31, after completing the low-amplitude cyclic loading in the cyclic group Cyc, single stretching is performed on each sample one by one until breaking; the breaking load Fbr is collected at the moment of breaking, and the breaking stress Sig is converted based on the pre-determined cross-sectional area Are; The breaking stress Sig is taken as the final strength value of the sample, and the final strength values of all samples are integrated to form the final strength set Ufn.

8. A method of testing the tensile strength of an alloy wire cable according to claim 7, wherein: The S3 also includes S32; S32, while completing the final strength set Ufn acquisition, the environmental temperature Tmp, the environmental humidity Hum and the loading rate Rat of each sample in the fracture determination process are reviewed for consistency; if they all fall within the allowed range set defined by the preceding baseline output set Out1, the fracture stress Sig of the sample corresponding to the sample is determined as a valid result, and continues to be retained in the final strength set Ufn; if any parameter deviates from the allowed range set Alw, the sample is marked into the abnormal event set Evt, and the low-amplitude cyclic loading and single stretching until fracture are re-executed according to the corresponding cyclic loading configuration set Cfg in the cyclic output set Out2, until the valid fracture stress Sig that meets the conditions is obtained.

9. A method of testing the tensile strength of an alloy wire cable according to claim 8, wherein: The S4 includes S41; S41, based on the initial strength set Uin and the final strength set Ufn, for each sample, the fatigue coupling coefficient Fec of the sample is defined, which quantifies the ratio of the fracture stress in the final strength set Ufn to the fracture stress in the initial strength set Uin; When the fatigue coupling coefficient Fec is greater than or equal to 0.8, it indicates that the strength attenuation of the sample after cyclic loading is small, and it is determined that the alloy cable after the tensile strength test meets the long-term service safety requirements of the project under actual service conditions; When the fatigue coupling coefficient Fec is less than 0.8, it indicates that the strength attenuation of the sample after cyclic loading is significant, and it is determined that the alloy cable after the tensile strength test does not meet the long-term service safety requirements of the project under actual service conditions; The fatigue coupling coefficients Fec of all samples are integrated to form a fatigue coupling result set Res, which is indexed according to the sample identification Sid, and has a corresponding relationship with the cyclic amplitude coefficient Caf and the number of cycles Cnt in the cyclic output set Out2.

10. An alloy wire tensile strength testing system for use in the alloy wire tensile strength testing method of any one of claims 1-9, wherein: It includes a cable grouping module, a cable cycle configuration and execution module, a cable testing module, and a cable strength determination module. The cable grouping module collects alloy cables of the same batch, constructs a sample set Sam, and divides them into a baseline group Bas and a cycle group Cyc for processing according to a random method, to obtain a baseline output set Out1. The cable cycle configuration and execution module uses a tension machine control sequence to establish a cyclic loading configuration set Cfg based on the baseline output set Out1, and automatically restarts the cycle phase of the sample according to the cyclic loading configuration set Cfg until the cycle phase record set Rec meets the stability criterion, and outputs the cyclic output set Out2. The cable testing module obtains the cycle group Cyc of the low-amplitude cycle based on the cyclic output set Out2, and synchronously performs review to obtain the final strength set Ufn. The cable strength determination module calculates the fatigue coupling coefficient Fec based on the initial strength set Uin and the final strength set Ufn, which is used to generate the tensile strength test results of the alloy cable.

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