A deformation simulation system and method for elastic tape

Abstract

The invention discloses a deformation simulation system and method for an elastic tape, belonging to the technical field of deformation simulation. The method specifically comprises: establishing a model of the tape, including: a tape elastic model and a tape electrical feedback model, performing stretching simulation on the tape, monitoring the deformation of the tape in real time, recording deformation data of the tape, relaxing the tape after stretching, monitoring the deformation recovery ability of the tape in real time, comprehensively analyzing the stress, strain and resistance data of the tape under different stretching and relaxation states, and judging whether the tape is qualified; through deformation simulation, the stress and strain distribution of the elastic tape under different stretching and use conditions can be accurately analyzed, thereby improving the structural design of the tape to meet the personalized needs of different users.

Description

Technical Field

[0001] The invention belongs to the technical field of deformation simulation, in particular to a deformation simulation system and method of an elastic tape. Background Art

[0002] Elastic tape is a medical auxiliary material with elastic and adhesive properties, which is widely used in wound care, sports injury support, postoperative recovery and other fields. Traditional tapes are usually made of cotton fabrics or synthetic fibers, which have certain air permeability and moisture absorption, but lack sufficient elasticity and self-adhesion, so external fixation devices or clamps are required to maintain their position during use. Elastic tape, through the combination of elastic material and adhesive layer, can directly fit the skin and provide support and fixation functions without the use of clamps. It is easy to use and remove, avoiding secondary injuries.

[0003] However, the material properties of elastic tape make its deformation behavior more complicated, including the nonlinear elastic deformation of the elastomer, the viscoelastic response of the adhesive layer, the interaction between the material and the skin, etc. In addition, in actual applications, the tape is usually subjected to multi-axial stress, and its deformation state is not only related to the stretching direction, but also involves deformation modes such as curling, bending and rotation. The detection of traditional tape deformation properties is mostly focused on mechanical properties, and usually ignores the complex process of the tape material, the comfort of the skin contact area, and the structural differences of the tape joints on the overall deformation performance. Therefore, the detection methods of the existing technology are difficult to meet the accurate evaluation of diversified products, especially for the characteristics of tapes under different manufacturing processes, and have not systematically considered the complex situations in actual use. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention proposes a deformation simulation system and method for an elastic tape. The method realizes accurate deformation detection of the elastic tape under different tensile states through a comprehensive electrical and mechanical simulation system, and combines electrical feedback to adjust the recovery process of the tape after tensile deformation, thereby improving the detection accuracy and efficiency.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A deformation simulation method for an elastic tape, comprising:

[0007] Establishing a tape model, including: a tape elastic model and a tape electrical feedback model;

[0008] Conduct stretching simulation on the tape, monitor the deformation of the tape in real time, and record the deformation data of the tape;

[0009] Relax the tape after stretching it, and monitor the tape's deformation recovery ability in real time;

[0010] Comprehensively analyze the stress, strain and resistance data of the tape under different stretching and relaxation states to determine whether the tape is qualified.

[0011] Specifically, the step of establishing the tape model includes:

[0012] By combining the mechanical model under different process structures with the influence of friction and stress concentration, the tape elastic model is established. The specific formula is:

[0013] ,

[0014] in, represents the tape elastic model, The stress expression of the tape under different process structures, F f represents the friction, which is the resistance created when the tape comes into contact with the skin. Represents the stress concentration effect in the tape bonding area;

[0015] Conductive material is embedded on the surface of the tape to construct a resistance strain gauge. During the stretching process of the tape, the resistance value of the resistance strain gauge changes. The electrical feedback model of the tape is established. The specific formula is:

[0016] ,

[0017] in, represents the electrical feedback model of the tape, that is, the resistance change of the tape surface resistance strain gauge, R0 represents the initial resistance value of the tape surface resistance strain gauge, k1 and k2 represent the correction coefficients of the tape geometric deformation, Represents the tensile strain on the tape.

[0018] Specifically, the different process structures include: weaving, knitting, and non-woven processes, and the stress expressions of the tapes under different process structures include: stress expressions of woven, knitted, and non-woven tapes.

[0019] Specifically, the stretching simulation of the tape includes:

[0020] Apply tensile force to the tape, and the specific formula for tensile force is:

[0021] ,

[0022] Where F(t) represents the tensile force applied to the tape, F0 represents the maximum tensile force, Indicates the loading frequency, F bias represents the initial preload, t represents the time, F c Indicates constant tensile force, CJ=1 means that the tensile force applied to the tape is dynamic tensile force, and CJ=0 means that the tensile force applied to the tape is constant tensile force;

[0023] Monitor the deformation of the tape in real time, record the deformation data of the tape, including the stress change and resistance change of the tape, and calculate the stress change rate of the tape. The calculation formula is:

[0024] ,

[0025] in, represents the stress change rate of the tape at time t, A represents the cross-sectional area of ​​the tape, It represents the rate of change of tensile force with time;

[0026] The resistance change of the tape is coupled with the stress change to calculate the resistance change of the tape. The specific formula is:

[0027] ,

[0028] in, represents the resistance change of the tape at time t, E represents the elastic modulus of the tape, k i represents the correction coefficient of the i-th tape geometric deformation, and ms represents the number of correction coefficients of the tape geometric deformation.

[0029] Specifically, the step of relaxing the tape after stretching and monitoring the deformation recovery ability of the tape in real time includes:

[0030] After the tape is stretched, it is relaxed, the stress of the tape during the recovery process is analyzed, and the viscoelastic relaxation model of the tape is established. The specific formula is:

[0031] ,

[0032] in, represents the viscoelastic relaxation model of the tape, Indicates the stress of the tape at maximum deformation, represents the relaxation time constant;

[0033] During the deformation recovery process of the tape, the resistance inside the tape will change. As the recovery process proceeds, the resistance value should gradually return to the initial resistance value. The specific formula for resistance value recovery is:

[0034] ,

[0035] in, represents the resistance value of the tape at time t, Indicates the change in resistance when the tape is deformed to its maximum;

[0036] The deformation recovery rate of the tape is calculated through the recovery data of stress and resistance. The specific formula is:

[0037] ,

[0038] ,

[0039] in, Indicates the stress recovery rate of the tape, which is the percentage of the tape returning to its initial state. Indicates the stress value of the tape when recovery is complete. represents the tape resistance recovery rate, Indicates the resistance value of the tape when recovery is complete.

[0040] Specifically, the comprehensive analysis of the stress, strain and resistance data of the tape under different stretching and relaxation states includes:

[0041] The mechanical and electrical parameters under different tensile states are coupled for analysis, and the relationship between the mechanical and electrical parameters is considered to evaluate the overall performance of the tape under different tensile states. The specific formula is:

[0042] ,

[0043] in, represents the overall performance of the tape at time t, represents the stress of the tape at time t when it is in tension, Indicates the maximum stress recorded by the tape during the tensile test. represents the strain of the tape at time t when it is stretched, It represents the maximum strain recorded when the tape is stretched. represents the resistance change of the tape at time t when it is stretched, It indicates the maximum resistance change recorded when the tape is stretched. , and Represents the weight coefficient, which is used to adjust the influence of stress, strain and resistance on the comprehensive performance evaluation to meet + + =1;

[0044] Considering the fatigue performance and deformation recovery ability of the tape in the stretch-recovery cycle, the fatigue accumulation value of the tape is calculated by recording the stress and resistance changes after the cycle, combining the recovery rate and fatigue accumulation effect. The specific formula is:

[0045] ,

[0046] Among them, F fatigueIt indicates the fatigue accumulation value of the tape, that is, the degree of performance loss of the tape after multiple stretching-recovery cycles. The larger the value, the higher the fatigue degree of the material and the more serious the performance loss. M indicates the total number of cycles. represents the stress change after the mth cycle, represents the strain change after the mth cycle, represents the resistance change after the mth cycle, , and Represents the weight coefficient.

[0047] Specifically, the step of judging whether the adhesive tape is qualified includes:

[0048] Set the overall performance qualification threshold P crit , the qualified threshold F of fatigue accumulation value crit , when P(t final )≥P crit When F(t final )≤F crit , the tape is judged to be qualified, otherwise, the tape is judged to be unqualified, where P(t final ) represents the overall performance of the tape at the time of recovery or at the end of the test, F(t final ) represents the fatigue accumulation value of the tape at the time of recovery or at the end of the test.

[0049] A deformation simulation system for an elastic tape, used to implement a deformation simulation method for an elastic tape, comprising: a tape model building module, a stretching simulation module, a relaxation recovery module and an analysis and judgment module;

[0050] The tape model building module is used to build a tape model, including: a tape elastic model and a tape electrical feedback model;

[0051] The stretching simulation module is used to simulate the stretching of the tape, monitor the deformation of the tape in real time, and record the deformation data of the tape;

[0052] The relaxation recovery module is used to relax the tape after stretching and monitor the deformation recovery ability of the tape in real time;

[0053] The analysis and judgment module is used to comprehensively analyze the stress, strain and resistance data of the adhesive tape under different stretching and relaxation states to determine whether the adhesive tape is qualified.

[0054] Specifically, the stretching simulation module includes: a stretching force applying unit, a stress change calculating unit and a resistance change calculating unit;

[0055] The tensile force applying unit is used to apply a tensile force to the adhesive tape;

[0056] The stress change calculation unit is used to calculate the stress change rate of the tape according to the deformation data of the tape;

[0057] The resistance change calculation unit is used to calculate the resistance change of the tape according to the deformation data of the tape.

[0058] Specifically, the analysis and judgment module includes: an overall performance analysis unit, a fatigue performance analysis unit and a qualified analysis unit;

[0059] The overall performance analysis unit is used to conduct coupling analysis based on the mechanical and electrical parameters under different tensile states, and to evaluate the overall performance of the tape under different tensile states by considering the relationship between the mechanical and electrical parameters;

[0060] The fatigue performance analysis unit is used to consider the fatigue performance and deformation recovery ability of the tape in the stretch-recovery cycle, and calculate the fatigue accumulation value of the tape by recording the stress and resistance changes after the cycle, combining the recovery rate and fatigue accumulation effect;

[0061] The qualified analysis unit is used to judge whether the adhesive tape is qualified according to the overall performance and fatigue performance of the adhesive tape.

[0062] Compared with the prior art, the present invention has the following beneficial effects:

[0063] 1. The present invention proposes a deformation simulation method for an elastic tape. Through deformation simulation, the stress and strain distribution of the elastic tape under different stretching and use conditions can be accurately analyzed, thereby improving the structural design of the tape.

[0064] 2. The present invention proposes a deformation simulation method for an elastic tape, which can accurately predict the behavior of the tape under different stress conditions through simulation, helping medical staff to use it reasonably and preventing potential risks such as skin compression and blood flow obstruction caused by improper use, especially when used for a long time.

[0065] 3. The present invention proposes a deformation simulation method for an elastic tape, which can help designers select the most suitable material combination and tape geometry to ensure that it has sufficient supporting force while avoiding patient discomfort caused by excessive stretching, so as to meet the personalized needs of different users. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 A flow chart of a deformation simulation method of an elastic tape provided by the present invention;

[0067] Figure 2 This is a diagram of the architecture of a deformation simulation system for an elastic tape provided by the present invention. DETAILED DESCRIPTION

[0068] Example 1

[0069] See also Figure 1 The present invention provides an embodiment: a deformation simulation method of an elastic tape, comprising the following specific steps:

[0070] Step S1: establishing a tape model, including a tape elastic model and a tape electrical feedback model;

[0071] The specific steps of step S1 are:

[0072] Step S101: By combining the mechanical models under different process structures with the influence of friction and stress concentration, a tape elastic model is established. The specific formula is:

[0073] ,

[0074] in, represents the tape elastic model, The stress expression of the tape under different process structures, F f represents the friction, which is the resistance created when the tape comes into contact with the skin. Represents the stress concentration effect in the tape bonding area;

[0075] The tape elastic model is used to describe the deformation properties of elastic tapes in actual use, especially the complex mechanical behavior in actual use.

[0076] The different process structures in step S101 include: weaving, knitting, and non-woven processes;

[0077] The stress expressions of the tape under different process structures specifically include:

[0078] 1) Woven tape model, the specific formula is: ,in, and They represent the stress in the warp direction (x-axis) and weft direction (y-axis) of the woven tape, respectively. Stress represents the force acting on a unit area. and They represent the strain in the warp and weft directions respectively. The strain represents the relative deformation of the material in a certain direction. and Respectively represent the elastic modulus in the warp direction and the weft direction, describing the tensile strength of the material in this direction. The higher the value, the more difficult the material is to be stretched. and They represent high-order nonlinear gauge coefficients, which are used to describe the nonlinear behavior of materials under large strains. They reflect the deformation complexity of materials and are suitable for nonlinear adjustments under larger deformations.

[0079] In this embodiment, the principle of the formula is: the linear part , characterizes the basic elastic response of the material, that is, the material will deform when stretched, and the deformation is proportional to the stress within a small strain range. The nonlinear part At larger strains, the linear model is no longer applicable. The nonlinear part takes into account the complex behavior of the material, such as the interaction between fiber interweaving, and enhances the accuracy of the model under large deformation. This model takes into account the anisotropic properties of woven tapes and is suitable for evaluating mechanical properties in different directions, which helps to more accurately simulate the deformation response of the tape during actual use.

[0080] 2) Knitted tape model, the specific formula is: ,in, represents the stress of the knitted tape in the tensile direction, represents the tensile strain of the knitted tape, E zz It represents the elastic modulus of the knitted tape and describes the basic tensile strength of the knitted tape. represents the nonlinear strain correction coefficient, which reflects the hardening effect of the knitted tape under medium to large strains. The structure will show stronger recovery ability under larger stretching.

[0081] In this embodiment, the principle of the formula is: the linear part When the tape is subjected to a small stress, the tape coil will stretch, and the deformation of the tape is proportional to the stress. When the strain increases, the geometric nonlinear effect of the tape coil deformation becomes prominent, and the coil of the knitted structure tape will undergo complex deformation. At this time, the nonlinear model is more accurate. This model takes into account the geometric characteristics and nonlinear elastic recovery force of the knitted tape coil structure. It can better describe the recovery performance of the knitted tape under large tensile deformation and ensure that it still has good resilience under large deformation.

[0082] 3) Non-woven tape model, the specific formula is: ,in, Indicates the stress of the nonwoven tape in the tensile direction, It represents the tensile strain of the nonwoven tape, E fz Indicates the elastic modulus of the nonwoven tape, It represents the fracture energy coefficient of the bonding point of the nonwoven tape, describing the nonlinear behavior of the material under deformation. n represents the deformation index, usually 2 to 3, which is used to describe the nonlinear effect under deformation.

[0083] In this embodiment, the principle of the formula is: the linear part When the deformation is small, the fibers of the nonwoven tape are tightly bound, the strain of the material is proportional to the stress, and the nonlinear part ,As the deformation increases, the nonwoven tape begins to break and reorganize, showing a more complex nonlinear deformation behavior.,This part is used to describe the rearrangement and recovery characteristics of the nonwoven tape.

[0084] Friction force F f The specific formula is: ,in, It represents the coefficient of friction, which describes the friction characteristics between the tape material and the skin. It is affected by the surface treatment of the material and the humidity of the skin. N represents the normal pressure, that is, the vertical pressure of the tape on the skin, which is usually determined by the tightness of the tape.

[0085] In this embodiment, the principle of the formula is: the friction model is based on Coulomb's friction law. When the tape contacts the skin, the friction will affect the stability and comfort of the tape. A larger friction can increase the adhesion of the tape and prevent sliding, but too high friction may cause skin discomfort. The formula can help design a suitable friction coefficient to ensure that the tape can effectively fit the skin without causing excessive friction damage to the skin, thereby improving the comfort of the tape.

[0086] Stress concentration effect in the tape bonding area The specific formula is: ,in, represents the stress in the unattached area of ​​the tape, h represents the thickness of the tape, and r represents the radius of curvature of the adhesive tape area;

[0087] In this embodiment, the principle of the formula is that in the bonding area, due to structural discontinuity, stress concentration will occur, causing the area to be easily damaged or torn. Through this formula, the amplification effect of stress at the bonding point can be estimated.

[0088] Step S102: embed conductive material on the surface of the tape to construct a resistance strain gauge. During the stretching process of the tape, the resistance value of the resistance strain gauge changes, and an electrical feedback model of the tape is established. The specific formula is:

[0089] ,

[0090] in, represents the electrical feedback model of the tape, that is, the resistance change of the tape surface resistance strain gauge, R0 represents the initial resistance value of the tape surface resistance strain gauge, k1 and k2 represent the correction coefficients of the tape geometric deformation, Represents the tensile strain on the tape.

[0091] In this embodiment, the resistance strain gauge technology uses the change in resistance of the material during the stretching process to monitor the strain. The resistance and strain are nonlinearly related. The model takes into account the effect of geometric deformation on resistance and is used to provide real-time feedback on the stretching condition of the tape. The electrical feedback model provides real-time feedback on the deformation condition of the tape through changes in resistance, thereby enhancing the monitoring accuracy, which is particularly valuable in continuous monitoring.

[0092] Step S2: performing a stretching simulation on the tape, monitoring the deformation of the tape in real time, and recording the deformation data of the tape;

[0093] The specific steps of step S2 are:

[0094] Step S201: applying a tensile force to the tape, the specific formula of the tensile force is:

[0095] ,

[0096] Wherein, F(t) represents the tensile force applied to the tape, F0 represents the maximum tensile force, i.e., the maximum tensile force applied to the tape, in Newtons. Indicates the loading frequency in radians per second (rad / s), which is used to simulate the response of the tape at different rates. bias represents the initial preload, which is used to simulate the deformation of the tape under the initial tension state. The unit is Newton (N), t represents time, and F c Indicates constant tensile force, CJ=1 means that the tensile force applied to the tape is dynamic tensile force, and CJ=0 means that the tensile force applied to the tape is constant tensile force;

[0097] Selection of stretching mode: For dynamic stretching in practical applications, such as tape expansion and contraction during muscle movement, a sine function is used to simulate the loading frequency. , which can simulate the dynamic response of the tape at different stretching rates; for static stretching, such as a tape that is used for a long time, the application of a constant force is closer to reality, and the constant stretching force F is used. c To simulate the deformation of materials under long-term tension.

[0098] Step S202: monitor the deformation of the tape in real time, record the deformation data of the tape, including the stress change and resistance change of the tape, and calculate the stress change rate of the tape. The calculation formula is:

[0099] ,

[0100] in, represents the stress change rate of the tape at time t, A represents the cross-sectional area of ​​the tape, It represents the rate of change of tensile force with time;

[0101] Through the stress change rate, the stress response of the tape at different loading stages can be evaluated in real time, thereby understanding the tensile strength of the material and its elastic recovery ability.

[0102] Step S203: coupling the change in tape resistance and the change in stress to calculate the change in tape resistance. The specific formula is:

[0103] ,

[0104] in, represents the resistance change of the tape at time t, E represents the elastic modulus of the tape, k i represents the correction coefficient of the i-th tape geometric deformation, and ms represents the number of correction coefficients of the tape geometric deformation.

[0105] Through this coupling relationship, the change in resistance can be directly associated with the change in stress, which simplifies the complexity of deformation measurement and avoids the separate calculation of strain;

[0106] The coupling relationship is used to further analyze the deformation characteristics of the tape in a complex mechanical environment, especially its failure mode under extreme stress conditions. The existing technology usually only monitors stress or resistance, and lacks correlation analysis between the two.

[0107] Step S3: Relaxing the tape after stretching it, and monitoring the deformation recovery ability of the tape in real time;

[0108] The specific steps of step S3 are:

[0109] Step S301: After the tape is stretched, it is relaxed, the stress of the tape during the recovery process is analyzed, and a viscoelastic relaxation model of the tape is established. The specific formula is:

[0110] ,

[0111] in, represents the viscoelastic relaxation model of the tape, which reflects the relaxation behavior of the tape after stress release, that is, the stress value of the tape at time t, Indicates the stress of the tape at maximum deformation, represents the relaxation time constant, in seconds (s), which reflects the time scale required for the tape to recover from the stretched state to the relaxed state, and is usually related to the viscoelastic properties of the tape material;

[0112] Step S302: During the deformation recovery process of the tape, the resistance inside the tape will change. As the recovery process proceeds, the resistance value should gradually return to the initial resistance value. The specific formula for resistance value recovery is:

[0113] ,

[0114] in, represents the resistance value of the tape at time t, Indicates the change in resistance when the tape is deformed to its maximum;

[0115] Step S303: Calculate the deformation recovery rate of the tape through the recovery data of stress and resistance. The specific formula is:

[0116] ,

[0117] ,

[0118] in, Indicates the stress recovery rate of the tape, which is the percentage of the tape returning to its initial state. Indicates the stress value of the tape when recovery is complete. represents the tape resistance recovery rate, Indicates the resistance value of the tape when recovery is complete.

[0119] In this embodiment, the formula for the stress recovery rate of the tape expresses the deformation recovery rate of the tape. The recovery ability of the tape is judged by comparing the stress difference between the recovery state and the initial state. The formula measures the extent to which the tape can recover to the maximum deformation state by dividing the stress difference by the initial stress. Finally, it is multiplied by 100% and converted into a percentage form to facilitate an intuitive evaluation of the recovery effect. The resistance recovery rate formula is similar to the deformation recovery rate, reflecting whether the tape can recover to its initial resistance state after deformation. The change in resistance is usually accompanied by the deformation of the material, so the resistance recovery rate can be used as an effective means to evaluate the recovery of the material structure. The formula evaluates the resistance recovery by comparing the final resistance change with the maximum resistance change.

[0120] Step S4: Comprehensively analyze the stress, strain and resistance data of the adhesive tape under different stretching and relaxation states to determine whether the adhesive tape is qualified.

[0121] The specific steps of step S4 are:

[0122] Step S401: Combine the mechanical and electrical parameters under different stretching states to perform coupling analysis, and consider the relationship between the mechanical and electrical parameters to evaluate the overall performance of the tape under different stretching states. The specific formula is:

[0123] ,

[0124] in, represents the overall performance of the tape at time t, represents the stress of the tape at time t when it is in tension, Indicates the maximum stress recorded by the tape during the tensile test. represents the strain of the tape at time t when it is stretched, It represents the maximum strain recorded when the tape is stretched. represents the resistance change of the tape at time t when it is stretched, It indicates the maximum resistance change recorded when the tape is stretched. , and Represents the weight coefficient, which is used to adjust the influence of stress, strain and resistance on the comprehensive performance evaluation to meet + + =1;

[0125] In this embodiment, the selection of the weight coefficient is adjusted according to the actual application requirements of the tape. For example, some medical tapes may pay more attention to the change of resistance (used to monitor physiological signals), while others may pay more attention to the performance of stress and strain (used for support and bandaging). In different application scenarios, the importance of the mechanical and electrical properties of the tape may be different. By introducing the weight coefficient, the contribution of each parameter to the comprehensive judgment can be adjusted according to specific needs. For example, in some scenarios, the stress recovery property of the tape may be more important, while in other scenarios, the resistance change property may be more critical. The flexible adjustment of the weight makes the formula highly adaptable in various applications. The formula can comprehensively reflect the overall performance of the tape by considering the comprehensive performance of both mechanics (stress, strain) and electricity (resistance change). This multi-parameter judgment method is more accurate than relying on a single parameter (such as only considering stress or resistance changes).

[0126] Step S402: Considering the fatigue performance and deformation recovery ability of the tape in multiple stretching-recovery cycles, the fatigue accumulation value of the tape is calculated by recording the stress and resistance changes after multiple cycles, combining the recovery rate and fatigue accumulation effect. The specific formula is:

[0127] ,

[0128] Among them, F fatigue It indicates the fatigue accumulation value of the tape, that is, the degree of performance loss of the tape after multiple stretching-recovery cycles. The larger the value, the higher the fatigue degree of the material and the more serious the performance loss. M indicates the total number of cycles. represents the stress change after the mth cycle, represents the strain change after the mth cycle, represents the resistance change after the mth cycle, , and represents the weight coefficient, which is set according to the actual situation or obtained by experimental simulation calculation by personnel in this field;

[0129] By normalizing and weighting the stress, strain, and resistance changes of each cycle, the formula can calculate the fatigue accumulation value of the tape. The cumulative form of the formula shows that as the number of cycles increases, the fatigue damage of the material continues to accumulate and the performance gradually declines. By introducing the weight coefficient, the influence weights of different parameters can be flexibly adjusted according to the different needs of the application scenario. For example, in some applications, mechanical properties (stress, strain) may be more important, while in other applications, electrical properties (resistance change) may be more critical. The weight setting makes the formula more flexible in application.

[0130] Step S403: Setting the overall performance pass threshold P crit , the qualified threshold F of fatigue accumulation value crit , when P(t final )≥P crit When F(t final )≤F crit , the tape is judged to be qualified, otherwise, the tape is judged to be unqualified, where P(t final ) represents the overall performance of the tape at the time of recovery or at the end of the test, F(t final ) represents the fatigue accumulation value of the tape at the time of recovery or at the end of the test.

[0131] In this embodiment, the qualified threshold value P of the overall performance is crit and the qualified threshold F of fatigue accumulation value crit , usually determined through experiments or industry standards, can be determined according to the following methods: 1) Historical data reference: Through a large amount of experimental data, statistically analyze the range of overall performance and fatigue accumulation values ​​of qualified products, and set reasonable critical values; 2) Industry standard comparison: Refer to relevant standards or regulations to determine the minimum allowable value of each parameter, and determine it by weighted method; 3) Custom standards: For tapes for specific purposes, stricter standards can be set according to special requirements (such as elasticity, conductivity, etc.).

[0132] Example 2

[0133] The invention provides an experiment of a deformation simulation method of an elastic tape.

[0134] Experimental purpose: This experiment aims to simulate and evaluate the mechanical and electrical properties of elastic tape during repeated stretching and deformation, and comprehensively judge the fatigue accumulation and performance degradation of the tape through the changes in stress, strain and resistance. The experiment will eventually give the fatigue accumulation value of the tape under different cycle times, as well as the experimental results of deformation recovery performance, and judge whether the elastic tape is qualified.

[0135] Experimental materials and equipment: The material is elastic tape (a composite material with conductive function made by weaving process). The equipment includes: tensile testing machine (for measuring stress and strain), precision resistance meter (for measuring resistance change), data acquisition system (for recording real-time data), environmental control equipment (to keep temperature and humidity constant to simulate the actual use environment) and high-speed camera equipment (for dynamic deformation monitoring).

[0136] Samples: Sample 1 is a woven tape, Sample 2 is a knitted tape, and Sample 3 is a non-woven tape. Each tape sample is cut into the same size, 10 cm × 2 cm. Each tape sample is subjected to N = 100 stretch-recovery cycles. The experimental data are shown in the following table;

[0137] Table 1 Woven tape (Sample 1)

[0138]

[0139] Table 2 Knitted tape (Sample 2)

[0140]

[0141] Table 3 Nonwoven tape (Sample 3)

[0142]

[0143] Experimental results:

[0144] 1. Overall performance of the tape at time t : With the increase of the number of stretching-recovery cycles, the stress, strain, and resistance of all samples changed, indicating that the performance of the tape gradually decayed.

[0145] The poor strain recovery and large resistance change of the woven tape indicate that its elasticity and conductivity gradually degrade during the cycle, resulting in Lower;

[0146] The knitted tape was relatively stable after 60 cycles, but showed obvious fatigue after 100 cycles;

[0147] Although the resistance change of non-woven tape is relatively small, the stress decreases quickly and the elastic recovery ability is relatively poor.

[0148] 2. Fatigue accumulation value F fatigue : Through calculation, the fatigue accumulation value of non-woven tape is the highest, indicating that its elasticity and conductivity decay most seriously during multiple deformation processes;

[0149] The fatigue accumulation value of the woven tape is lower, but the change in resistance is larger, indicating that the degradation of the conductive performance is more obvious;

[0150] The fatigue accumulation value of the knitted tape is relatively moderate, showing good comprehensive performance.

[0151] Example 3

[0152] See also Figure 2 , another embodiment provided by the present invention: a deformation simulation system for an elastic tape, comprising: a tape model building module, a stretching simulation module, a relaxation recovery module and an analysis and judgment module;

[0153] The tape model building module is used to build a tape model, including: a tape elastic model and a tape electrical feedback model;

[0154] The stretching simulation module is used to simulate the stretching of the tape, monitor the deformation of the tape in real time, and record the deformation data of the tape;

[0155] The relaxation recovery module is used to relax the tape after stretching and monitor the deformation recovery ability of the tape in real time;

[0156] The analysis and judgment module is used to comprehensively analyze the stress, strain and resistance data of the adhesive tape under different stretching and relaxation states to determine whether the adhesive tape is qualified.

[0157] A stretching simulation module, comprising: a stretching force applying unit, a stress change calculating unit and a resistance change calculating unit;

[0158] The tensile force applying unit is used to apply a tensile force to the adhesive tape;

[0159] The stress change calculation unit is used to calculate the stress change rate of the tape according to the deformation data of the tape;

[0160] The resistance change calculation unit is used to calculate the resistance change of the tape according to the deformation data of the tape.

[0161] Analysis and judgment module, including: overall performance analysis unit, fatigue performance analysis unit and qualified analysis unit;

[0162] The overall performance analysis unit is used to conduct coupling analysis based on the mechanical and electrical parameters under different tensile states, and to evaluate the overall performance of the tape under different tensile states by considering the relationship between the mechanical and electrical parameters;

[0163] The fatigue performance analysis unit is used to consider the fatigue performance and deformation recovery ability of the tape in the stretch-recovery cycle, and calculate the fatigue accumulation value of the tape by recording the stress and resistance changes after the cycle, combining the recovery rate and fatigue accumulation effect;

[0164] The qualified analysis unit is used to judge whether the adhesive tape is qualified according to the overall performance and fatigue performance of the adhesive tape.

[0165] In addition, the parts of the above-mentioned technical solutions provided in the embodiments of the present application that are consistent with the implementation principles of the corresponding technical solutions in the prior art are not described in detail to avoid excessive redundancy.

[0166] The specific implementation modes as described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation mode of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A deformation simulation method for an elastic tape, characterized in that: include: Establishing a tape model, including: a tape elastic model and a tape electrical feedback model; Conduct stretching simulation on the tape, monitor the deformation of the tape in real time, and record the deformation data of the tape; Relax the tape after stretching it, and monitor the tape's deformation recovery ability in real time; Comprehensively analyze the stress, strain and resistance data of the tape under different stretching and relaxation states to determine whether the tape is qualified; The method of establishing a tape model comprises: By combining the mechanical model under different process structures with the influence of friction and stress concentration, the tape elastic model is established. The specific formula is: ， in, represents the tape elastic model, The stress expression of the tape under different process structures, F f represents the friction, which is the resistance created when the tape comes into contact with the skin. Represents the stress concentration effect in the tape bonding area; Conductive material is embedded on the surface of the tape to construct a resistance strain gauge. During the stretching process of the tape, the resistance value of the resistance strain gauge changes. The electrical feedback model of the tape is established. The specific formula is: ， in, represents the electrical feedback model of the tape, that is, the resistance change of the tape surface resistance strain gauge, R0 represents the initial resistance value of the tape surface resistance strain gauge, k1 and k2 represent the correction coefficients of the tape geometric deformation, Represents the tensile strain on the tape.

2. A deformation simulation method for an elastic tape as claimed in claim 1, characterized in that: The different process structures include: weaving, knitting, and non-woven processes. The stress expressions of the tapes under different process structures include: stress expressions of woven, knitted, and non-woven tapes.

3. The deformation simulation method of an elastic tape according to claim 1, characterized in that: The stretching simulation of the tape comprises: Apply tensile force to the tape, and the specific formula for tensile force is: ， Where F(t) represents the tensile force applied to the tape, F0 represents the maximum tensile force, Indicates the loading frequency, F bias represents the initial preload, t represents the time, F c Indicates constant tensile force, CJ=1 means that the tensile force applied to the tape is dynamic tensile force, and CJ=0 means that the tensile force applied to the tape is constant tensile force; Monitor the deformation of the tape in real time, record the deformation data of the tape, including the stress change and resistance change of the tape, and calculate the stress change rate of the tape. The calculation formula is: ， in, represents the stress change rate of the tape at time t, A represents the cross-sectional area of ​​the tape, It represents the rate of change of tensile force with time; The resistance change of the tape is coupled with the stress change to calculate the resistance change of the tape. The specific formula is: ， in, represents the resistance change of the tape at time t, E represents the elastic modulus of the tape, k i represents the correction coefficient of the i-th tape geometric deformation, ms represents the number of correction coefficients of the tape geometric deformation, R0 represents the initial resistance value of the tape surface resistance strain gauge, k1 and k2 represent the correction coefficients of the tape geometric deformation.

4. The deformation simulation method of an elastic tape according to claim 1, characterized in that: The step of relaxing the tape after stretching and monitoring the deformation recovery ability of the tape in real time includes: After the tape is stretched, it is relaxed, the stress of the tape during the recovery process is analyzed, and the viscoelastic relaxation model of the tape is established. The specific formula is: ， in, represents the viscoelastic relaxation model of the tape, Indicates the stress of the tape at maximum deformation, represents the relaxation time constant, and t represents time; During the deformation recovery process of the tape, the resistance inside the tape will change. As the recovery process proceeds, the resistance value should gradually return to the initial resistance value. The specific formula for resistance value recovery is: ， in, represents the resistance value of the tape at time t, Indicates the change in resistance when the tape is deformed to its maximum; The deformation recovery rate of the tape is calculated through the recovery data of stress and resistance. The specific formula is: ， ， in, Indicates the stress recovery rate of the tape, which is the percentage of the tape returning to its initial state. Indicates the stress value of the tape when recovery is complete. represents the tape resistance recovery rate, Indicates the resistance value of the tape when recovery is complete.

5. The deformation simulation method of an elastic tape according to claim 1, characterized in that: The comprehensive analysis of the stress, strain and resistance data of the tape under different stretching and relaxation states includes: The mechanical and electrical parameters under different tensile states are coupled for analysis, and the relationship between the mechanical and electrical parameters is considered to evaluate the overall performance of the tape under different tensile states. The specific formula is: ， in, represents the overall performance of the tape at time t, represents the stress of the tape at time t when it is in tension, Indicates the maximum stress recorded by the tape during the tensile test. represents the strain of the tape at time t when it is stretched, It represents the maximum strain recorded when the tape is stretched. represents the resistance change of the tape at time t when it is stretched, It indicates the maximum resistance change recorded when the tape is stretched. , and Represents the weight coefficient, which is used to adjust the influence of stress, strain and resistance on the comprehensive performance evaluation to meet + + =1; Considering the fatigue performance and deformation recovery ability of the tape in the stretch-recovery cycle, the fatigue accumulation value of the tape is calculated by recording the stress and resistance changes after the cycle, combining the recovery rate and fatigue accumulation effect. The specific formula is: ， Among them, F fatigue It indicates the fatigue accumulation value of the tape, that is, the degree of performance loss of the tape after multiple stretching-recovery cycles. The larger the value, the higher the fatigue degree of the material and the more serious the performance loss. M indicates the total number of cycles. represents the stress change after the mth cycle, represents the strain change after the mth cycle, represents the resistance change after the mth cycle, , and Represents the weight coefficient.

6. The deformation simulation method of an elastic tape according to claim 1, characterized in that: The step of judging whether the adhesive tape is qualified includes: Set the overall performance qualification threshold P crit , the qualified threshold F of fatigue accumulation value crit , when P(t final )≥P crit When F(t final )≤F crit , the tape is judged to be qualified, otherwise, the tape is judged to be unqualified, where P(t final ) represents the overall performance of the tape at the time of recovery or at the end of the test, F(t final ) represents the fatigue accumulation value of the tape at the time of recovery or at the end of the test.

7. A deformation simulation system for an elastic tape, used to implement a deformation simulation method for an elastic tape according to any one of claims 1 to 6, characterized in that: It includes: tape model building module, stretching simulation module, relaxation recovery module and analysis and judgment module; The tape model building module is used to build a tape model, including: a tape elastic model and a tape electrical feedback model; The stretching simulation module is used to simulate the stretching of the tape, monitor the deformation of the tape in real time, and record the deformation data of the tape; The relaxation recovery module is used to relax the tape after stretching and monitor the deformation recovery ability of the tape in real time; The analysis and judgment module is used to comprehensively analyze the stress, strain and resistance data of the adhesive tape under different stretching and relaxation states to determine whether the adhesive tape is qualified.

8. The elastic tape deformation simulation system according to claim 7, characterized in that: The stretching simulation module includes: a stretching force applying unit, a stress change calculating unit and a resistance change calculating unit; The tensile force applying unit is used to apply a tensile force to the adhesive tape; The stress change calculation unit is used to calculate the stress change rate of the tape according to the deformation data of the tape; The resistance change calculation unit is used to calculate the resistance change of the tape according to the deformation data of the tape.

9. The elastic tape deformation simulation system according to claim 8, characterized in that: The analysis and judgment module includes: an overall performance analysis unit, a fatigue performance analysis unit and a qualified analysis unit; The overall performance analysis unit is used to conduct coupling analysis based on the mechanical and electrical parameters under different tensile states, and to evaluate the overall performance of the tape under different tensile states by considering the relationship between the mechanical and electrical parameters; The fatigue performance analysis unit is used to consider the fatigue performance and deformation recovery ability of the tape in the stretch-recovery cycle, and calculate the fatigue accumulation value of the tape by recording the stress and resistance changes after the cycle, combining the recovery rate and fatigue accumulation effect; The qualified analysis unit is used to judge whether the adhesive tape is qualified according to the overall performance and fatigue performance of the adhesive tape.

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