A reliability accelerated test method

Abstract

The present invention relates to the technical field of reliability testing, and discloses a reliability acceleration test method. The reliability acceleration test method comprises: performing a limit stress test on a test sample to obtain a working limit stress parameter of the test sample, judging whether there is a target environmental test that can be converted into the reliability verification test duration in the candidate environmental tests according to the working limit stress parameter, and if so, performing a reliability verification test on the second sample that needs to participate in the reliability verification test according to the number of first samples that have completed the target environmental test and the number of second samples that need to participate in the reliability verification test. Therefore, this embodiment can convert the environmental test completed by the sample into the reliability verification test duration when the sample has completed the environmental test, thereby shortening the time the sample participates in the reliability verification test, which is beneficial to reducing the reliability verification test cost.

Description

Technical Field

[0001] The present invention relates to the technical field of reliability testing, and in particular to a reliability accelerated testing method. Background Art

[0002] With the rapid development of electronic technology, high reliability and long life are required for electronic products. In order to verify whether the product can meet the index requirements, it is necessary to conduct reliability index testing on the product.

[0003] Reliability index verification test refers to the test conducted to measure or verify product reliability.

[0004] Currently, the reliability indicators of products are usually verified based on the statistical test schemes provided by the standards. However, for products with high reliability or long life indicators, it usually takes a long time to test, and the test cost is high, which is not conducive to product development and rapid market launch. Summary of the invention

[0005] An object of an embodiment of the present invention is to provide a reliability accelerated test method, which can solve the technical problem of long reliability test time in the prior art.

[0006] In a first aspect, an embodiment of the present invention provides a reliability acceleration test method, comprising:

[0007] Performing a working limit stress test on the test sample to obtain the working limit stress parameters of the test sample;

[0008] According to the working limit stress parameter, determining whether there is a target environmental test in the candidate environmental tests, wherein the target environmental test is an environmental test that can be converted to the duration of the reliability verification test;

[0009] If there is a target environmental test among the candidate environmental tests, a reliability verification test is performed on the second samples that need to participate in the reliability verification test according to the number of first samples that have completed the target environmental test and the number of second samples that need to participate in the reliability verification test.

[0010] If the target environmental test does not exist in the candidate environmental tests, performing an accelerated reliability test on the second samples according to the number of the second samples.

[0011] Optionally, the performing a reliability verification test on the second samples that need to participate in the reliability verification test according to the number of the first samples that have completed the target environment test and the number of the second samples that need to participate in the reliability verification test includes:

[0012] Determining whether the quantity of the first sample is greater than or equal to the quantity of the second sample;

[0013] If the number of the first samples is greater than or equal to the number of the second samples, then the reliability verification time required for each of the second samples is determined according to the preset total verification time and the number of the first samples, and the equivalent reliability verification time corresponding to each of the target environmental tests completed by the first sample is determined; and a reliability verification test is performed on each of the second samples according to the first reliability verification time and the equivalent reliability verification time, where the equivalent reliability verification time is the time for each environmental test completed by the first sample converted to the reliability verification test;

[0014] If the number of the first samples is less than the number of the second samples, an accelerated reliability test is performed on the second samples according to the number of the second samples.

[0015] Optionally, each of the target environmental tests has a corresponding first acceleration model, and the determining of a reduced reliability verification time corresponding to each of the target environmental tests completed by the first sample includes:

[0016] Calculate the equivalent reliability verification time corresponding to each of the target environmental tests completed by the first sample according to the test time of each of the target environmental tests completed by the first sample and the corresponding first acceleration model;

[0017] According to the equivalent reliability verification time, a reliability verification test is performed on the second sample that needs to participate in the reliability verification test.

[0018] Optionally, the calculating the equivalent reliability verification time corresponding to each target environmental test completed by the first sample includes:

[0019] Determining a first acceleration coefficient corresponding to each of the target environmental tests according to a first acceleration model corresponding to each of the target environmental tests;

[0020] According to the test duration corresponding to each of the target environmental tests completed by the first sample and the first acceleration factor, the equivalent reliability verification duration corresponding to each of the target environmental tests completed by the first sample is calculated.

[0021] Optionally, performing a reliability verification test on each of the second samples according to the first reliability verification time and the converted reliability verification time includes:

[0022] Adding the equivalent reliability verification duration corresponding to each of the target environment tests completed by the first sample to obtain the equivalent reliability verification total duration;

[0023] According to the first reliability verification time and the converted total reliability verification time, a reliability verification test is performed on each of the second samples.

[0024] Optionally, performing a reliability verification test on each of the second samples according to the first reliability verification time and the converted total reliability verification time includes:

[0025] Calculate the time difference between the first reliability verification time and the converted total reliability verification time;

[0026] According to the time difference, a reliability verification test is performed on each of the second samples.

[0027] Optionally, performing a reliability verification test on each of the second samples according to the time difference includes:

[0028] If the duration difference is less than the first preset duration threshold, there is no need to perform a reliability verification test on the second sample;

[0029] If the duration difference is greater than or equal to the first preset duration threshold and less than the second preset duration threshold, a reliability verification test is performed on each of the second samples according to the duration difference, and the second preset duration threshold is greater than the first preset duration threshold;

[0030] If the time difference is greater than or equal to the second preset time threshold, an accelerated reliability test is performed on each of the second samples.

[0031] Optionally, the reliability accelerated test has a corresponding second acceleration model, and performing the second reliability accelerated test on each of the second samples includes:

[0032] Determining a second acceleration coefficient according to the second acceleration model;

[0033] Calculating the duration of the second acceleration test according to the second acceleration coefficient and the duration difference;

[0034] Perform a second reliability accelerated test on each of the second samples according to the duration of the second accelerated test.

[0035] Optionally, it also includes:

[0036] If the target environmental test does not exist in the candidate environmental tests, performing an accelerated reliability test on the second samples according to the number of the second samples.

[0037] Optionally, performing the reliability accelerated test on the second samples according to the quantity of the second samples comprises:

[0038] Determining the second reliability verification time required for each of the second samples according to the preset total test time and the number of the second samples;

[0039] Perform an accelerated reliability test on the second sample according to the second reliability verification time.

[0040] The reliability accelerated test method provided by the embodiment of the present invention includes: performing a limit stress test on the test sample to obtain the working limit stress parameters of the test sample, judging whether there is a target environmental test in the candidate environmental tests according to the working limit stress parameters, the target environmental test is an environmental test that can be converted to the duration of the reliability verification test, and if there is a target environmental test in the candidate environmental tests, then according to the number of first samples that have completed the target environmental test and the number of second samples that need to participate in the reliability verification test, the reliability verification test is performed on the second sample that needs to participate in the reliability verification test. Therefore, this embodiment can convert the environmental test completed by the sample into the duration of the reliability verification test when the sample has completed the environmental test, thereby shortening the duration of the sample participating in the reliability verification test, which is conducive to reducing the cost of the reliability verification test. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] One or more embodiments are illustrated only as examples in the corresponding drawings, and these examples do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0042] Figure 1 It is a flow chart of a reliability acceleration test method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] It should be noted that, if there is no conflict, the various features in the embodiments of the present invention can be combined with each other, all within the scope of protection of the present invention. In addition, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in a different order from the module division in the device or the flow chart. Furthermore, the words "first", "second", "third", etc. used in the present invention do not limit the data and execution order, but only distinguish the same items or similar items with basically the same functions and effects.

[0045] See also Figure 1The reliability acceleration test method provided by the embodiment of the present invention includes:

[0046] S1. Conduct a working limit stress test on the test sample to obtain the working limit stress parameters of the test sample;

[0047] In this step, the test sample refers to the sample used in the test, research or detection process. The working limit stress test is a test used to evaluate the maximum stress that the test sample can withstand during operation. The limit stress test includes but is not limited to low temperature step test, high temperature step test, constant humidity step test, etc. The working limit stress parameter is the working limit stress parameter determined after the test sample undergoes the limit stress test.

[0048] For example, a HALT (Highly Accelerated Life Testing) test chamber or a temperature chamber is first used to perform a low-temperature step test on the test sample to obtain the low-temperature working limit temperature Tmin of the test sample, and then a high-temperature step test is performed on the test sample to obtain the high-temperature working limit stress Tmax of the test sample. The humidity step temperature selects the high-temperature working limit stress Tmax, and the test sample is step-tested starting from the relative humidity of 50% RH. If the test sample does not fail during the test until RH%max, RH%max is used as the limit working humidity of the test sample. For example, if the test sample does not fail during the test until 95%RH, 95%RH is used as the limit working humidity of the test sample.

[0049] S2. According to the working limit stress parameter, determine whether there is a target environmental test in the candidate environmental tests, where the target environmental test is an environmental test that can be converted to the duration of the reliability verification test;

[0050] In this step, the candidate environmental test is a test to verify whether the test sample can work normally under relatively extreme environmental conditions. The candidate environmental test is a reliability acceleration test under a relatively typical working environment. It should be noted that the typical working environment refers to the test environment in which the sample undergoes reliability verification test. The candidate environmental tests include but are not limited to high temperature working test, low temperature working test, constant humidity and heat test, temperature cycle test, high temperature aging test, etc.

[0051] Each candidate environmental test has corresponding test conditions, for example, the test condition of the high temperature working test is 65°C, and the test condition of the low temperature working test is -30°C. In order for the test sample to be able to undergo environmental tests normally, it is necessary to determine the target environmental test that the test sample can participate in and that can be converted into the reliability verification test duration in the candidate environmental tests based on the working limit stress parameters of the test sample.

[0052] For example, the high-temperature working limit temperature of the test sample is 70°C, and the low-temperature working limit temperature is -30°C. In the candidate environmental tests, the test conditions of the high-temperature working test are 65°C, and the test conditions of the low-temperature working test are -30°C. Then, in the candidate environmental tests, the target environmental test that the test sample can participate in and that can be converted into a reliability verification test time is determined to be the high-temperature working test.

[0053] At present, the time required to verify the reliability indicators of products according to the statistical test scheme provided by the standard is relatively long. As mentioned above, the candidate environmental test is a reliability accelerated test relative to the typical working environment, which contains the reliability information of the product. Therefore, when the test samples can participate in the target environmental test that can be converted into the reliability verification test time, these target environmental tests can be converted into the reliability verification test time. After conversion, the time for subsequent samples to participate in the reliability verification test can be shortened.

[0054] S3. If there is a target environmental test among the candidate environmental tests, a reliability verification test is performed on the second samples that need to participate in the reliability verification test according to the number of first samples that have completed the target environmental test and the number of second samples that need to participate in the reliability verification test.

[0055] In this step, the first sample is a test sample that has completed the target environment test that can be converted into the reliability verification test time, and the second sample is a test sample that needs to participate in the reliability verification test. The number of second samples can be equal to the number of first samples, or can be less than the number of first samples, or can be greater than the number of first samples. When the number of second samples is less than or equal to the first number, for example, the number of second samples is 2 and the number of first samples is 3, then 2 samples can be randomly selected from the 3 first samples that have completed the target environment test that can be converted into the reliability verification test time as the second samples for further reliability verification tests.

[0056] Therefore, this embodiment can convert the target environmental test that has been completed by the sample, which can be converted into the reliability verification test, into the reliability verification test when the sample has completed the target environmental test, thereby shortening the time that the sample participates in the reliability verification test, which is beneficial to reducing the reliability verification cost.

[0057] In some embodiments, based on the number of first samples that have completed the target environmental test that can be converted into the reliability verification test time and the number of second samples that need to participate in the reliability verification, when performing a reliability verification test on the number of second samples that need to participate in the reliability verification test, it is determined whether the number of first samples is greater than or equal to the number of second samples. When the number of first samples is greater than or equal to the number of second samples, all first samples that have completed the target environmental test that can be converted into the reliability verification test time can be used to further participate in the reliability verification test. At this time, based on the preset total verification time and the number of first samples, the first reliability verification time required for each second sample is determined. Based on the first reliability verification time and the converted reliability verification time corresponding to each target environmental test that the first sample has completed that can be converted into the reliability verification test time, a reliability verification test is performed on each second sample.

[0058] In some embodiments, the first reliability verification time is determined according to the following formula:

[0059]

[0060] Among them, T 需1 is the first reliability verification time, T 总 is the preset total verification time, and m is the number of first samples.

[0061] Assume that the minimum acceptable value of the product reliability indicator MTBF (Mean Time Between Failure) is θ 1 According to GJB899A-2009, GB / T5080.7-1986 or other reliability verification test or life test standards, the test bench is required to be θ 1 D m times, the preset total verification time T can be determined 总 =θ 1 *D m .

[0062] In some embodiments, each target environmental test has a corresponding first acceleration model. When determining the equivalent reliability verification time corresponding to each target environmental test completed by the first sample, the equivalent reliability verification time corresponding to each target environmental test completed by the first sample is calculated based on the test time of each target environmental test completed by the first sample and the corresponding first acceleration model. The equivalent reliability verification time is the time of each environmental test completed by the first sample converted to the reliability verification test. Based on the equivalent reliability verification time, a reliability verification test is performed on the second sample that needs to participate in the reliability verification test.

[0063] In some embodiments, the first acceleration model is a model for determining the first acceleration coefficient corresponding to each target environmental test completed by the first sample. For example, the target environmental test includes a high temperature working test, a low temperature working test, a high temperature and high humidity working test, and a temperature cycle change test. Accordingly, the first acceleration coefficient corresponding to the high temperature working test is AF H , the first acceleration factor corresponding to the low temperature working test is AF L , the first acceleration coefficient corresponding to the high temperature and high humidity working test is AF HR The first acceleration factor corresponding to the temperature cycle test is AF TC .

[0064] In some embodiments, the first acceleration model corresponding to the high temperature working test is as follows:

[0065]

[0066] Among them, AF H is the first acceleration factor corresponding to the high temperature working test, E a1 is the activation energy parameter of the high temperature working test, K is the Boltzmann constant, T a1 is the normal working temperature of high temperature working test, T u1 It is the test temperature for high temperature working test.

[0067] In the high temperature working test, the activation energy parameter E a1 The choice of is very important, which has a great influence on the first acceleration factor. a1 When the selection is inaccurate, the calculation result of the first acceleration coefficient may deviate greatly from the actual situation, and the accuracy of the result cannot be guaranteed.

[0068] In some embodiments, in order to more accurately determine the activation energy parameter E a1 , Normal working temperature T a1 And test temperature T u1 , the product can be placed at a certain working temperature T a The test is carried out under low temperature and the temperature field distribution of the product is observed during the test. The thermal weak link of the product is determined by thermal imaging and other methods. The temperature of the thermal weak link is used as the first acceleration factor AF corresponding to the high temperature working test. H Normal operating temperature T a1 , and place the product at a certain test temperature T u The test is carried out under low temperature and the temperature field distribution of the product is observed during the test. The thermal weak link of the product is determined by thermal imaging and other methods. The temperature of the thermal weak link is used as the first acceleration factor AF corresponding to the high temperature working test. H The test temperature T u1At the same time, the activation energy parameter of the thermal weak link of the product is used as the activation energy parameter E of the high temperature working test a1 In this way, the first acceleration coefficient corresponding to the high temperature working test can be calculated more accurately, ensuring the accuracy of the first acceleration coefficient.

[0069] In this embodiment, it is assumed that the activation energy parameter E of the high temperature working test is a1 is 0.68, normal operating temperature T a1 The test temperature is 23℃, T u1 is 45°C, then according to the acceleration model corresponding to the above-mentioned high temperature working test, the first acceleration coefficient corresponding to the high temperature working test is 6.32.

[0070] In some embodiments, the first acceleration model corresponding to the low temperature working test is as follows:

[0071]

[0072] Among them, AF L is the first acceleration factor corresponding to the low temperature working test, α T is the temperature coefficient of the low temperature working test, E a2 is the activation energy parameter of the low temperature working test, T a2 is the normal working temperature of the low temperature working test, T u2 Test temperature for low temperature working test.

[0073] Since low temperature environment can also cause product performance to decline or even fail, its reliability will also be affected. High temperature and low temperature have similar failure factors, such as thermal expansion and contraction causing cracks or fractures. For example, high temperature and low temperature can cause changes in device performance parameters. The failure rate caused by high temperature and low temperature depends on many factors such as the use environment and application scenarios of different materials. Generally speaking, high temperature failures in electronic products are more common than low temperature failures. In the low temperature working test provided in the embodiment of the present invention, a temperature coefficient α is proposed. T It is used to describe the low-temperature failure rate, and 0<αT≤1. Based on this, the first acceleration model corresponding to the low-temperature working test is constructed to accurately simulate the low-temperature working test process of the product.

[0074] It is worth noting that there is currently no acceleration model corresponding to the low-temperature working test. This embodiment obtains the first acceleration model corresponding to the low-temperature working test by reasonably improving the first acceleration model of the high-temperature working test, which can expand the types of candidate environmental tests and is beneficial to improving the conversion effect of the target environmental test completed by the first sample to the reliability verification test.

[0075] In some embodiments, the first acceleration model corresponding to the high temperature and high humidity working test is as follows:

[0076]

[0077] Among them, AF HR is the first acceleration factor corresponding to the high temperature and high humidity working test, E a2 is the activation energy parameter of high temperature and high humidity working test, T a3 is the normal working temperature of the high temperature and high humidity working test, T u3 RH is the test temperature of high temperature and high humidity working test. a is the normal humidity, RH u To test humidity.

[0078] In this embodiment, it is assumed that the normal operating temperature T a3 The test temperature is 23℃, the normal humidity is 50%RH, and the test temperature is T u3 The temperature is 45°C and the test humidity is 95% RH. According to the first acceleration model corresponding to the high temperature and high humidity working test, the first acceleration coefficient corresponding to the high temperature and high humidity working test is 22.82.

[0079] In some embodiments, the first acceleration model corresponding to the temperature cycling test is as follows:

[0080]

[0081] Among them, AF TC is the first acceleration factor corresponding to the temperature cycle test, ΔT 1 is the test temperature difference of the temperature cycle test, ΔT 2 is the temperature difference of the normal ambient temperature cycle, v 1 is the temperature change rate of the temperature cycle test, v 2 is the temperature change rate of the conventional ambient temperature cycle, T 1 is the high temperature of the temperature cycle test, T 2 It is the low temperature of temperature cycle test.

[0082] Assume that the test temperature difference ΔT of the temperature cycle test 1 -15℃~55℃, normal ambient temperature cycle temperature difference ΔT 2 The temperature change rate v of the temperature cycle test is 0℃~40℃ 1 The temperature change rate of the conventional ambient temperature cycle is 5℃ / min. 2 The high temperature T of the temperature cycle test is 1℃ / min. 1 The low temperature T of the temperature cycle test is 55°C. 2 is -15°C, then according to the first acceleration model corresponding to the above-mentioned temperature cycle change test, the first acceleration coefficient corresponding to the temperature cycle change test is 5.75.

[0083] In some embodiments, the test duration of each target environmental test completed by the first sample is multiplied by the corresponding first acceleration factor to obtain the equivalent reliability verification duration corresponding to each target environmental test completed by the first sample.

[0084] As mentioned above, if the target environmental tests that the first sample participates in include high temperature working test, low temperature working test, high temperature and high humidity working test and temperature cycle change test, the equivalent reliability verification time corresponding to each target environmental test that the first sample can participate in is shown in the following table:

[0085] Table 1

[0086]

[0087] Assume that the first sample has completed the high temperature working test for a test duration of h H The first acceleration factor AF corresponding to the high temperature working test is 48 hours H is 6.32, then the equivalent reliability verification time corresponding to the high temperature working test of the first sample is AF H *h H =6.32*48=303.4 hours.

[0088] Assume that the first sample has completed the low temperature working test for a test duration of h L The first acceleration factor AF corresponding to the low temperature working test is 48 hours L is 3.34, then the equivalent reliability verification time corresponding to the low temperature working test of the first sample is AF L *h L =3.34*48=160.3 hours.

[0089] Assume that the first sample has completed the high temperature and high humidity working test for a test duration of h HR The first acceleration factor AF corresponding to the high temperature and high humidity test for 24 hours HR is 22.82, then the equivalent reliability verification time corresponding to the low temperature working test of the first sample is AF HR *h HR =22.82*24=547.7 hours.

[0090] Assume that the first sample has completed the temperature cycle test. The holding time of high temperature and low temperature is h TC The first acceleration factor AF corresponding to the temperature cycle change test is 2 hours and the number of cycles is 10. TC is 5.75, then the equivalent reliability verification time corresponding to the temperature cycle change test of the first sample is AF TC *2N*h TC =5.75*40=230 hours.

[0091] For example, as mentioned above, if the target environmental tests completed by the first sample include high temperature working test, low temperature working test, high temperature and high humidity working test and temperature cycle change test, then the total reliability verification time T is equivalent to C =AF H *h H +AF L *h L +AF HR *h HR +AF TC *2N*h TC .

[0092] In some embodiments, when performing a reliability verification test on each second sample based on the first reliability verification time and the converted total reliability verification time, the time difference between the first reliability verification time and the converted total reliability verification time is calculated, and a reliability verification test is performed on each second sample based on the time difference.

[0093] For example, the first reliability verification time T 需1 It is 4867 hours, which is equivalent to the total reliability verification time T C is 2303 hours, then the time difference is T D =4867-2303=2564 hours.

[0094] In some embodiments, when a reliability verification test is performed on each second sample based on the duration difference, if the duration difference is less than a first preset duration threshold, there is no need to perform a reliability verification test on the second sample.

[0095] For example, the first preset time threshold is 0. When the time difference is less than 0, it means that after the first sample has completed the target environmental test, a second sample will be sampled from the first sample that has completed the target environmental test for further reliability verification test. There is no need to conduct additional reliability verification tests on the second sample to meet the reliability index requirements.

[0096] Since the target environmental test completed by the second sample is an accelerated reliability test under a relatively typical working environment, this embodiment can shorten the time the second sample takes part in the reliability verification test and reduce the reliability verification test cost.

[0097] If the duration difference is greater than or equal to the first preset duration threshold and less than the second preset duration threshold, a reliability verification test is performed on each second sample according to the duration difference, and the second preset duration threshold is greater than the first preset duration threshold.

[0098] For example, the second preset time threshold is 500 hours. When the time difference is greater than or equal to 0 and less than 500 hours, it indicates that the total reliability verification time T is C The first reliability verification time T 需1 It is relatively close. When a second sample is drawn from the first sample that has completed the target environmental test for further reliability verification test, the reliability index requirement can be met only by conducting reliability verification on the second sample for a time duration reaching the time difference.

[0099] Although the second sample still needs to undergo reliability verification tests, since the second sample has completed the target environment test that can be converted into the reliability verification test time, the time the second sample participates in the reliability verification test can be shortened, reducing the reliability verification test cost.

[0100] If the duration difference is greater than or equal to the second preset duration threshold, a reliability acceleration test is performed on each second sample.

[0101] For example, when the time difference is greater than 500 hours, it means that the tested sample has completed the target environmental test that can be converted into the reliability verification test time. When the second sample is sampled from the first sample that has completed the target environmental test for further reliability verification test, it will take a considerable amount of reliability verification test to meet the reliability index requirements. Therefore, in order to shorten the time for each second sample to participate in the reliability verification test, this embodiment uses the reliability acceleration test to accelerate the reliability verification process of the second sample.

[0102] In some embodiments, the reliability accelerated test has a second acceleration model. When performing the reliability accelerated test on each second sample, the second acceleration coefficient is determined according to the second acceleration model, and the first accelerated test duration is calculated according to the second acceleration coefficient and the time difference. According to the first accelerated test duration, the reliability accelerated test is performed on each second sample.

[0103] In some embodiments, the second acceleration model is as follows:

[0104]

[0105] Among them, AF 2 is the second acceleration factor, E a4 is the activation energy parameter of the second reliability accelerated test, T a4 is the normal operating temperature of the reliability accelerated test, T u4 It is the test temperature for the accelerated reliability test.

[0106] In some embodiments, the first accelerated test duration is expressed by the following formula:

[0107]

[0108] Among them, T test1 is the duration of the first accelerated test, T D is the duration difference, AF 2 is the second acceleration factor.

[0109] Since the reliability accelerated test is a test that accelerates the reliability verification test, this embodiment can shorten the reliability verification test time of the second sample and reduce the reliability verification test cost.

[0110] When the target environmental test does not exist in the candidate environmental tests, the number of first samples that can be converted into the reliability verification test time is 0. At this time, the number of first samples must be less than the number of second samples. Therefore, in this case, in order to enable the second samples to meet the reliability index requirements and to shorten the time for the second samples to participate in the reliability verification test, in some embodiments, please continue to refer to Figure 1 The reliability accelerated test method further includes S4: performing a reliability accelerated test on the second samples according to the number of the second samples.

[0111] When the number of first samples is less than the number of second samples, for example, the number of first samples is 2 and the number of second samples is 3, although the two first samples have completed the target environmental test that can be converted into the reliability verification test time, three samples cannot be sampled from the two first samples as second samples for further participating in the reliability verification test. Therefore, in this case, in order to enable the second samples to meet the reliability index requirements and to shorten the time for the second samples to participate in the reliability verification test, in some embodiments, the second samples are subjected to accelerated reliability tests also according to the number of second samples.

[0112] In some embodiments, when performing an accelerated reliability test on the second samples based on the number of second samples, the second reliability verification time required for each second sample is determined based on a preset total verification time and the number of second samples, and the second samples are subjected to an accelerated reliability test based on the second reliability verification time.

[0113] In some embodiments, the second reliability verification time is calculated according to the following formula:

[0114]

[0115] Among them, T 需2 is the second reliability verification time, T 总 is the preset total verification time, and n is the number of second samples.

[0116] In some embodiments, when performing a reliability accelerated test on the second sample according to the second reliability verification time, the second accelerated test time is calculated according to the second reliability verification time and the second acceleration coefficient, and the reliability accelerated test is performed on the second sample according to the second accelerated test time.

[0117] In some embodiments, the second accelerated test duration is expressed by the following formula:

[0118]

[0119] Among them, T test2 is the duration of the second accelerated test, T 需2 is the second reliability verification time, AF 2 is the second acceleration factor.

[0120] Since the reliability accelerated test is a test that accelerates the reliability verification test, this embodiment can shorten the reliability verification test time of the second sample and reduce the reliability verification test cost.

[0121] Finally, it should be noted that the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments are not intended to be additional limitations on the content of the present invention. The purpose of providing these implementations is to make the understanding of the disclosure of the present invention more thorough and comprehensive. In addition, under the idea of ​​the present invention, the above-mentioned technical features continue to be combined with each other, and there are many other changes in different aspects of the present invention as described above, which are all considered to be within the scope of the present invention specification; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the present invention.

Claims

1. A reliability accelerated test method, It is characterized in that include: Performing a working limit stress test on the test sample to obtain the working limit stress parameters of the test sample; According to the working limit stress parameter, determining whether there is a target environmental test in the candidate environmental tests, wherein the target environmental test is an environmental test that can be converted to the duration of the reliability verification test, and each of the target environmental tests has a corresponding first acceleration model; If there is a target environmental test among the candidate environmental tests, performing a reliability verification test on the second samples that need to participate in the reliability verification test according to the number of first samples that have completed the target environmental test and the number of second samples that need to participate in the reliability verification test; The performing the reliability verification test on the second samples that need to participate in the reliability verification test according to the number of the first samples that have completed the target environment test and the number of the second samples that need to participate in the reliability verification test comprises: Determining whether the quantity of the first sample is greater than or equal to the quantity of the second sample; If the number of the first samples is greater than or equal to the number of the second samples, the first reliability verification time required for each of the second samples is determined according to the preset total verification time and the number of the first samples, and the equivalent reliability verification time corresponding to each of the target environmental tests completed by the first sample is calculated according to the test time of each of the target environmental tests completed by the first sample and the corresponding first acceleration model, and a reliability verification test is performed on each of the second samples according to the reliability verification time and the equivalent reliability verification time, the equivalent reliability verification time being the time of each target environmental test completed by the first sample converted to the reliability verification test, and the preset total verification time being the verification time determined according to the reliability verification test or life test standard; If the number of the first samples is less than the number of the second samples, an accelerated reliability test is performed on the second samples according to the number of the second samples.

2. The method according to claim 1, It is characterized in that The calculating of the equivalent reliability verification time corresponding to each target environmental test completed by the first sample comprises: Determining a first acceleration coefficient corresponding to each of the target environmental tests according to a first acceleration model corresponding to each of the target environmental tests; According to the test duration corresponding to each of the target environmental tests completed by the first sample and the first acceleration factor, the equivalent reliability verification duration corresponding to each of the target environmental tests completed by the first sample is calculated.

3. The method according to claim 1, It is characterized in that The performing a reliability verification test on each of the second samples according to the first reliability verification time and the converted reliability verification time includes: Adding the equivalent reliability verification duration corresponding to each of the target environment tests completed by the first sample to obtain the equivalent reliability verification total duration; According to the first reliability verification time and the converted total reliability verification time, a reliability verification test is performed on each of the second samples.

4. The method according to claim 3, It is characterized in that The performing a reliability verification test on each of the second samples according to the first reliability verification time and the converted total reliability verification time includes: Calculate the time difference between the first reliability verification time and the converted total reliability verification time; According to the time difference, a reliability verification test is performed on each of the second samples.

5. The method according to claim 4, It is characterized in that The performing a reliability verification test on each of the second samples according to the time difference comprises: If the duration difference is less than the first preset duration threshold, there is no need to perform a reliability verification test on the second sample; If the duration difference is greater than or equal to the first preset duration threshold and less than the second preset duration threshold, a reliability verification test is performed on each of the second samples according to the duration difference, and the second preset duration threshold is greater than the first preset duration threshold; If the time difference is greater than or equal to the second preset time threshold, an accelerated reliability test is performed on each of the second samples.

6. The method according to claim 5, It is characterized in that The reliability accelerated test has a corresponding second acceleration model, and performing the reliability accelerated test on each of the second samples comprises: Determining a second acceleration coefficient according to the second acceleration model; Calculating the duration of the second acceleration test according to the second acceleration coefficient and the duration difference; Perform a reliability accelerated test on each of the second samples according to the duration of the second accelerated test.

7. The method according to any one of claims 1 to 6, It is characterized in that Also includes: If the target environmental test does not exist in the candidate environmental tests, performing an accelerated reliability test on the second samples according to the number of the second samples.

8. The method according to claim 7, It is characterized in that The performing the reliability accelerated test on the second samples according to the quantity of the second samples comprises: Determining the second reliability verification time required for each of the second samples according to the preset total test time and the number of the second samples; Perform an accelerated reliability test on the second sample according to the second reliability verification time.

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