A method for accelerated storage test of fuze

Abstract

The present invention provides a method for accelerated storage testing of fuzes, comprising: performing initial performance testing on test samples; conducting accelerated storage testing according to a predetermined test profile, wherein the test profile includes 4n outer cycles (one), 3n outer cycles (two), 2n outer cycles (three), and n outer cycles (four), sequentially in chronological order, where n is an integer and greater than or equal to 1; sampling and performance testing at predetermined time points, with test items including dimensions, surface corrosion, aging, and electrical properties. The present invention not only meets current requirements for accelerated storage testing of fuzes but is also applicable to the lifespan assessment of fuzes stored in complex natural environments, more accurately simulating the failure mechanisms of fuzes affected by the coupled effects of temperature cycling fatigue, thermal-oxidative aging, and humidity.

Description

Technical Field

[0001] The invention relates to the technical field of accelerated storage testing of explosive devices, and in particular to a method for accelerated storage testing of fuzes. Background Art

[0002] The fuze is a critical link in the chain of action for an ammunition system to achieve effective target damage. Its safety and operational reliability after long-term storage are crucial to the system's ability to achieve its intended destructive combat mission. Currently, accelerated fuze life testing is primarily conducted according to the temperature aging test methods outlined in GJB 5103-2004, "Methods for Accelerated Life Testing of Ammunition Components," and GJB 736.8-1990, "Test Methods for Explosive Devices - 71°C Test Method." This involves conducting accelerated life testing on the fuze at elevated temperatures, followed by an assessment of its storage life at room temperature using the traditional Arrhenius equation or empirical acceleration factors. Limited by the time these standards were developed and the specific environments in which exploratory devices were used, this method is suitable for conducting accelerated storage testing on fuzes subject to thermal oxidation chemical aging failure mechanisms. However, with the advancement of ammunition system technology and changes in the state, environment, and conditions in which ammunition systems operate, this method no longer meets the current requirements for accelerated storage testing of fuzes. In particular, it is unsuitable for assessing the life of fuzes stored in complex natural environments. Summary of the Invention

[0003] At least in view of the problems mentioned in the background technology, the present invention aims to provide a method for accelerating storage testing of fuzes.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution.

[0005] A method for accelerating storage testing of fuzes, comprising the following steps:

[0006] Step 1: Perform initial performance testing on the test sample;

[0007] Step 2: Place several test samples into the test chamber, maintaining appropriate spacing between adjacent samples. The distance between the samples and the inner wall of the test chamber should be at least 10 mm.

[0008] Step 3: Close the door of the test chamber and conduct an accelerated storage test according to a set test profile, wherein the test profile includes:

[0009] Carry out 4n outer loops 1, 3n outer loops 2, 2n outer loops 3, and n outer loops 4 in chronological order, where n ≥ 1 and is an integer;

[0010] The outer cycle 1 is composed of a plurality of first stress levels T1 and first temperature cycles arranged in a time sequence, and there is a first temperature cycle between any adjacent first stress levels T1;

[0011] The second outer cycle is composed of a plurality of second stress levels T2 and second temperature cycles arranged in a time sequence, and there is a second temperature cycle between any adjacent second stress levels T2;

[0012] The outer cycle three is composed of a plurality of third stress levels T3 and third temperature cycles arranged in a time sequence, and there is a third temperature cycle between any adjacent third stress levels T3;

[0013] The outer cycle four is composed of a plurality of fourth stress levels T2 and fourth temperature cycles arranged in a time sequence, and there is a fourth temperature cycle between any adjacent fourth stress levels T4;

[0014] The relative humidity during the test was controlled at 80%;

[0015] Step 4: Sampling and performance testing are carried out at preset time points. The test items include size, appearance corrosion, aging, and electrical properties.

[0016] In order to further improve the accuracy of the life assessment of the fuze product, adjacent external cycles are transitioned through temperature cycles, that is, the starting point of the temperature cycle is connected to the end point of the previous external cycle, and the end point of the temperature cycle is connected to the starting point of the next external cycle.

[0017] As a preferred solution, the first stress level T1 is: temperature 53°C, total time 36 days; the second stress level T2 is: temperature 62°C, total time 27 days; the third stress level T3 is: temperature 71°C, total time 18 days; the fourth stress level T4 is: temperature 80°C, total time 9 days; the heating time of each temperature cycle is 12.5 minutes, the cooling time is 12.5 minutes, and the low temperature holding time is 60 minutes.

[0018] In order to further improve the accuracy of the life assessment of the fuze product, at least three stress levels are set in each outer cycle.

[0019] In step 4, 20 samples are taken out for testing at 12d+16h, 25d+8h, 38d+0h, 47d+12h, 57d+0h, 66d+12h, 72d+20h, 79d+4h, 85d+12h, 88d+16h, 91d+20h, and 95d+0h after the start of the test.

[0020] In order to implement the performance test more accurately and stably, in step 4, before performing the performance test, the test sample is placed at (21±6)°C for at least 12 hours.

[0021] As a preferred solution, the fuze is an electrically triggered fuze.

[0022] Beneficial effects: The adoption of the scheme of the present invention can not only meet the relevant needs of the current accelerated storage test of fuzes, but also be applicable to the life assessment of fuze products stored in complex natural environments, and can more accurately simulate the failure mechanism of the fuze caused by the coupling action of temperature cycle fatigue, thermal oxygen aging, and humidity. The scheme of the present invention integrates the uniform distribution of temperature cycle stress into the constant humidity step temperature aging test, and can also effectively simulate the temperature and humidity aging effect caused by the daily day and night temperature difference cycle during the actual use of the fuze. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the test spectrum of the accelerated storage test of the fuze in the embodiment. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the following embodiments are only intended to help understand the principles and core concepts of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that for those skilled in the art, improvements made to the present invention without departing from the principles of the present invention also fall within the scope of protection of the claims of the present invention. Example

[0025] A method for accelerating storage testing of fuzes, comprising the following steps:

[0026] Step 1: Perform initial performance testing on the test sample;

[0027] Test samples should be randomly selected from the same batch of fuzes, and should be well packaged and clearly marked. The fuzes tested are fully equipped XX / XXXX electromechanical trigger fuzes, used for XX mortar rounds and XXX extended-range rounds, made of 304 stainless steel, with a polytetrafluoroethylene wind cap, 704 glue, and potted. The samples must be unfired and factory-qualified products. The total number of samples is 300, with 20 samples tested for original performance and 20 samples tested per cycle, for a total of 240 samples for 12 cycles, and 40 samples for spare.

[0028] Step 2: Place the test samples into the test chamber, maintaining appropriate spacing between adjacent samples. The distance between the sample and the inner wall of the test chamber should be 12±1mm.

[0029] Step 3: Close the door of the test chamber and follow the set test spectrum (such as Figure 1 The accelerated storage test is carried out as shown in FIG. 1 , wherein the test spectrum includes:

[0030] Carry out 4 external cycles 1, 3 external cycles 2, 2 external cycles 3, and 1 external cycle 4 in chronological order; among them,

[0031] Three stress levels are set in each external cycle, and adjacent external cycles are transitioned through temperature cycles, that is, the starting point of the temperature cycle connects to the end point of the previous external cycle, and the end point of the temperature cycle connects to the starting point of the next external cycle;

[0032] The outer cycle 1 consists of three first stress levels T1 and three first temperature cycles arranged in time sequence, with one first temperature cycle between any adjacent first stress levels T1; the total duration of each outer cycle 1 is controlled to be 12d+16h;

[0033] The second outer cycle consists of three second stress levels T2 and three second temperature cycles arranged in time sequence, with one second temperature cycle between any two adjacent second stress levels T2. The total duration of each second outer cycle is controlled to be 9 days + 12 hours.

[0034] The outer cycle three consists of three third stress levels T3 and three third temperature cycles arranged in time sequence, with one third temperature cycle between any adjacent third stress levels T3; the total duration of each outer cycle three is controlled to be 6 days + 8 hours;

[0035] The outer cycle 4 consists of three fourth stress levels T2 and three fourth temperature cycles arranged in time sequence, with one fourth temperature cycle between any adjacent fourth stress levels T4; the total duration of each outer cycle 4 is controlled to be 3d+4h;

[0036] The relative humidity during the test was controlled at 80%;

[0037] The first stress level T1 is 53°C for a total of 36 days; the second stress level T2 is 62°C for a total of 27 days; the third stress level T3 is 71°C for a total of 18 days; and the fourth stress level T4 is 80°C for a total of 9 days. The heating time for each temperature cycle is 12.5 minutes, the cooling time is 12.5 minutes, the high temperature holding time is 155 minutes, and the low temperature holding time is 60 minutes.

[0038] Step 4. Sampling and performance testing are carried out at preset time points. The test items include size, appearance corrosion, aging, and electrical properties (performed after sample dissection). In order to implement performance testing more accurately and stably, the test samples are regulated at (21±6)℃ for 15h before performance testing. 20 samples are taken out for testing at 12d+16h, 25d+8h, 38d+0h, 47d+12h, 57d+0h, 66d+12h, 72d+20h, 79d+4h, 85d+12h, 88d+16h, 91d+20h, and 95d+0h after the start of the test.

[0039] The test chamber used in this embodiment is a rapid temperature change cycle humidity test chamber that meets the requirements of GJB 150.3A-2009 and meets the requirements of temperature range: -70°C to 150°C, heating and cooling rate 0 to 10°C / min, temperature deviation ±2°C, humidity range: 30% RH to 98% RH, and relative humidity control accuracy: -3% to +2%.

[0040] In other embodiments, 8 (4*2) outer cycles 1, 6 (3*2) outer cycles 2, 4 (2*2) outer cycles 3, and 1 (1*2) outer cycle 4 can be carried out in chronological order, and the temperature, time, and number of stress levels of each cycle can be flexibly adjusted.

[0041] The adoption of this scheme can not only meet the current needs of accelerated storage testing of fuzes, but also be applicable to the life assessment of fuze products stored in complex natural environments. It can more accurately simulate the failure mechanism of fuzes affected by the coupling action of temperature cycle fatigue, thermal oxygen aging, and humidity. This scheme evenly distributes the temperature cycle stress and integrates it into the constant humidity step temperature aging test. It can also effectively simulate the temperature and humidity aging effects caused by the daily day and night temperature difference cycle during the actual use of the fuze.

Claims

1. A method for accelerating storage testing of fuzes, characterized in that the steps include: Step 1: Perform initial performance testing on the test sample; Step 2: Place several test samples into the test chamber, maintaining appropriate spacing between adjacent samples. The distance between the samples and the inner wall of the test chamber should be at least 10 mm. Step 3: Close the door of the test chamber and conduct an accelerated storage test according to a set test profile, wherein the test profile includes: Carry out 4n outer loops 1, 3n outer loops 2, 2n outer loops 3, and n outer loops 4 in chronological order, where n ≥ 1 and is an integer; The outer cycle 1 is composed of a plurality of first stress levels T1 and first temperature cycles arranged in a time sequence, and there is a first temperature cycle between any adjacent first stress levels T1; The second outer cycle is composed of a plurality of second stress levels T2 and second temperature cycles arranged in a time sequence, and there is a second temperature cycle between any adjacent second stress levels T2; The outer cycle three is composed of a plurality of third stress levels T3 and third temperature cycles arranged in a time sequence, and there is a third temperature cycle between any adjacent third stress levels T3; The outer cycle four is composed of a plurality of fourth stress levels T2 and fourth temperature cycles arranged in a time sequence, and there is a fourth temperature cycle between any adjacent fourth stress levels T4; The relative humidity during the test was controlled at 80%; Step 4: Sampling and performance testing are carried out at preset time points. The test items include size, appearance corrosion, aging, and electrical properties.

2. The accelerated storage test method for fuzes according to claim 1, characterized in that: Adjacent external cycles are transitioned through temperature cycles.

3. The accelerated storage test method for fuzes according to claim 2, characterized in that: The first stress level T1 is: temperature 53°C, total time 36 days; the second stress level T2 is: temperature 62°C, total time 27 days; the third stress level T3 is: temperature 71°C, total time 18 days; the fourth stress level T4 is: temperature 80°C, total time 9 days; the heating time of each temperature cycle is 12.5 minutes, the cooling time is 12.5 minutes, and the low temperature holding time is 60 minutes.

4. The accelerated storage test method for fuzes according to claim 3, characterized in that: At least three stress levels are set in each outer loop.

5. The accelerated storage test method for fuzes according to any one of claims 1 to 4, characterized in that: In step 4, 20 samples are taken out for testing at 12d+16h, 25d+8h, 38d+0h, 47d+12h, 57d+0h, 66d+12h, 72d+20h, 79d+4h, 85d+12h, 88d+16h, 91d+20h, and 95d+0h after the start of the test.

6. The accelerated storage test method for fuzes according to claim 5, characterized in that: In step 4, before performing the performance test, the test sample is placed at (21±6)°C for at least 12 hours.

7. The accelerated storage test method for fuzes according to claim 6, characterized in that: The fuze is an electrically triggered fuze.

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