Quantitative judgment method for friction sensitivity test result

Abstract

The invention provides a quantitative determination method for a friction sensitivity test result. The method comprises the following steps: step 1, installing and placing an infrared thermal imager; 2, carrying out a baseline test on the non-sparking materials with the same texture; 3, carrying out a friction sensitivity test on the to-be-tested sample; and 4, judging the result according to the maximum difference value of the temperature change in the test process. The method provided by the invention solves the problem that results of discoloration, scratches, sample stirring and the like cannot be judged by a BAM method, and avoids misjudgment of friction sensitivity test results. Compared with the existing method for judging the result by observing the phenomena of explosion sound, luminescence, smoking and the like, the method disclosed by the invention has the advantages that the result is judged according to the maximum difference value of the temperature change in the test process, and personal errors caused by judging the result by different operators are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of energetic materials, relates to a friction sensitivity test, and in particular to a method for quantitatively determining a friction sensitivity test result. Background Art

[0002] Mechanical stimulation such as friction exists in many links of energetic materials during preparation, transfer, storage, etc. In these processes, the friction sensitivity of energetic materials is the basis of safety design, hazard identification, and risk assessment. Therefore, accurately obtaining the friction sensitivity of energetic materials is of great significance to the safety of energetic material processing, transportation, and storage.

[0003] At present, the main test methods for friction sensitivity of energetic materials are explosion probability method and BAM (Federal Institute for Materials Testing, Germany) method. The explosion probability method has a large test sample size. The sample is placed between two steel cylinders, and the friction sensitivity test is performed by applying a certain pressure and hitting the upper impact column. When any of the following phenomena is observed, such as explosion sound, light, smoke, sample color change, ablation marks on the sliding cylinder surface in contact with the sample, and the smell of the sample decomposition explosion product, it is judged to be an explosion, otherwise it is judged to be non-explosive. For the BAM method commonly used by the United Nations and the North Atlantic Treaty Organization, the sample is placed between a movable porcelain plate and a porcelain rod, and the friction sensitivity test is performed by applying a certain pressure and causing the porcelain plate and the porcelain rod to move relative to each other. The explosion sound, light, smoke, etc. are observed to determine whether the result is an explosion.

[0004] At present, when judging the results of the BAM method, there are several problems in the following aspects if the results are judged only by explosion sound, light, and smoke: (1) If the sample changes color or there are traces of ablation on the surface of the porcelain plate in contact with the sample, it is impossible to judge whether the result is an explosion; (2) Each friction test will leave obvious scratches on the surface of the porcelain plate, which makes it impossible to judge whether the result is an explosion; (3) When the porcelain plate and the porcelain rod move relative to each other, the powdered sample is stirred due to the movement of the porcelain rod, which will cover up the discoloration or ablation phenomena.

[0005] The above problems will affect the determination of the BAM friction sensitivity test results and the accurate acquisition of the friction sensitivity results. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a method for quantitatively determining the results of a friction sensitivity test, so as to solve the technical problem in the prior art that the results of the friction sensitivity test process of energetic materials using the BAM method cannot be quantitatively determined.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems: A method for quantitatively determining the results of a friction sensitivity test, the method is performed according to the following steps: Step 1: Install the infrared thermal imager: On the side of the BAM friction sensitivity meter, an infrared thermal imager is placed in parallel, and the focus of the infrared thermal imager is the contact point between the porcelain rod and the porcelain plate.

[0008] Step 2: Conduct baseline tests on non-fired materials of the same quality: Non-fire-resistant materials of the same texture are selected to carry out friction sensitivity tests under set stimulation amounts. During the entire friction sensitivity test process, infrared thermal temperature maps and temperature change curves of contact points are collected, and the maximum difference in the temperature change curves is used as the baseline value.

[0009] Step 3: Conduct friction sensitivity test on the sample to be tested: A friction sensitivity test is carried out on the sample to be tested, and infrared thermal temperature diagrams and temperature change curves of the contact points are collected during the test.

[0010] Step 4: Determine the result based on the maximum difference in temperature change during the test: The maximum difference is determined based on the temperature change curve of the contact point during the test process. If the maximum difference in temperature change during the test process is greater than the baseline value + the absolute value of the ambient temperature fluctuation difference, the test result is judged to be an explosion, otherwise it is judged to be no explosion.

[0011] Preferably, in step 2, the non-fireable material is sodium citrate.

[0012] Preferably, in step three, the sample to be tested is the energetic material TKX-50.

[0013] Compared with the prior art, the present invention has the following technical effects: (I) The method of the present invention solves the problem that the BAM method cannot determine the results of discoloration, scratches, sample agitation, etc., and avoids misjudgment of the friction sensitivity test results.

[0014] (II) Compared with the current method of judging the results by observing explosion sounds, light emission, smoke and the like, the method of the present invention judges the results based on the maximum difference in temperature change during the test process, thereby avoiding human errors caused by different operators judging the results.

[0015] (III) The method of the present invention can also provide a method for studying the ignition mechanism under friction stimulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the structural formula of TKX-50 in the embodiment.

[0017] Figure 2 This is the location where the infrared thermal imager is installed in the embodiment.

[0018] Figure 3It is the infrared thermal imaging temperature change curve of the baseline test under 80N friction stimulation in the embodiment.

[0019] Figure 4 It is the infrared thermal imaging temperature change curve of the baseline test under 360N friction stimulation in the embodiment.

[0020] Figure 5 It is the infrared thermal imaging temperature change curve of the sensitivity test under 80N friction stimulation in the embodiment.

[0021] Figure 6 It is the infrared thermal imaging temperature change curve of the sensitivity test under 360N friction stimulation in the embodiment.

[0022] The meanings of the numbers in the figure are: 1-BAM friction sensitivity meter, 2-infrared thermal imager, 3-ceramic rod, 4-ceramic plate.

[0023] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0024] It should be noted that, unless otherwise specified, all materials and equipment in the present invention are materials and equipment known in the prior art.

[0025] In accordance with the above technical scheme, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of this application fall within the protection scope of the present invention.

[0026] Example: This embodiment provides a method for quantitatively determining the results of a friction sensitivity test. Taking the friction sensitivity test of energetic material TKX-50 as an example, the method is specifically described. The method is performed in the following steps: Step 1: Install the infrared thermal imager: like Figure 2 As shown, an infrared thermal imager 2 is placed in parallel on the side of the BAM friction sensitivity meter 1, and the focus position of the infrared thermal imager 2 is the contact position between the porcelain rod 3 and the porcelain plate 4.

[0027] In step 1, the BAM friction sensitivity meter 1 and the infrared thermal imager 2 maintain a test distance of 0.5 to 1 m.

[0028] Step 2: Conduct baseline tests on non-fired materials of the same quality: Non-fire-resistant materials of the same texture are selected to carry out friction sensitivity tests under set stimulation amounts. During the entire friction sensitivity test process, infrared thermal temperature maps and temperature change curves of contact points are collected, and the maximum difference in the temperature change curves is used as the baseline value.

[0029] In step 2, the method for selecting non-flammable materials of the same texture is: for energetic organic crystal materials, non-flammable organic crystals are selected as the baseline; for energetic inorganic crystal materials, non-flammable inorganic crystals are selected as the baseline; for energetic polymer materials, non-flammable polymers are selected as the baseline; and for energetic liquid materials, non-flammable liquids are selected as the baseline.

[0030] In step 2, the energetic material TKX-50 to be tested is an energetic organic crystal material, so the non-pyrophoric material sodium citrate is selected for the friction sensitivity baseline test.

[0031] In step 2, the friction sensitivity test is performed no less than 3 times, and the result is the average value of the maximum difference of the temperature change curve.

[0032] Specifically, the results of the friction sensitivity test in this embodiment are as follows Figure 3 and Figure 4 The maximum difference of the temperature change curve of the baseline test under different friction stimulation amounts is shown in Table 1 below, and the average value of the maximum difference of the three tests is shown in Table 1 below.

[0033] Table 1 Maximum difference of temperature change curve of baseline test under different friction stimulation amounts

[0034] Step 3: Conduct friction sensitivity test on the sample to be tested: A friction sensitivity test is carried out on the sample to be tested, and infrared thermal temperature diagrams and temperature change curves of the contact points are collected during the test.

[0035] In step 3, the sample to be tested is the energetic material TKX-50. In this embodiment, the friction sensitivity test of the energetic material TKX-50 is carried out by the BAM method. Since the TKX-50 material is a relatively soft organic ionic compound with a structural formula as shown in FIG. Figure 1 shown.

[0036] Specifically, in this embodiment, a friction sensitivity test is performed on the sample to be tested, TKX-50. During the test, infrared thermal temperature diagrams of the test area and temperature change curves of the contact points are collected. Figure 5 and Figure 6 As shown, the results show that the maximum difference of the temperature change curve during the test under 80N friction stimulation is 2.60℃, and the maximum difference of the temperature change curve during the test under 360N friction stimulation is 9.40℃.

[0037] Step 4: Determine the result based on the maximum difference in temperature change during the test: The maximum difference is determined based on the temperature change curve of the contact point during the test process. If the maximum difference in temperature change during the test process is greater than the baseline value + the absolute value of the ambient temperature fluctuation difference, the test result is judged to be an explosion, otherwise it is judged to be no explosion.

[0038] In step 4, the ambient temperature fluctuation difference is the ambient temperature fluctuation difference during the acquisition process of the infrared thermal imager (2).

[0039] Specifically in this embodiment, the ambient temperature during the entire test process is 18° C., and the ambient temperature fluctuation difference collected by the infrared thermal imager is ±1° C.

[0040] Under 80N friction stimulation, 2.60℃<2.03℃+1℃, and the result is judged as not exploding.

[0041] Under 360N friction stimulation, 9.40℃>6.93℃+1℃, and the result is judged as explosion.

Claims

1. A method for quantitatively determining the results of a friction sensitivity test, characterized in that: The method proceeds as follows: Step 1: Install the infrared thermal imager: On the side of the BAM friction sensitivity meter (1), an infrared thermal imager (2) is placed in parallel, and the focus of the infrared thermal imager (2) is the contact part between the porcelain rod (3) and the porcelain plate (4); Step 2: Conduct baseline tests on non-fired materials of the same quality: Select non-fireable materials of the same texture to conduct friction sensitivity tests under set stimulation levels. During the entire friction sensitivity test process, collect infrared thermal temperature images and temperature change curves of contact points, and use the maximum difference in the temperature change curve as the baseline value. Step 3: Conduct friction sensitivity test on the sample to be tested: Conduct friction sensitivity test on the sample to be tested, and collect infrared thermal temperature map and temperature change curve of contact point during the test process; Step 4: Determine the result based on the maximum difference in temperature change during the test: The maximum difference is determined based on the temperature change curve of the contact point during the test process. If the maximum difference in temperature change during the test process is greater than the baseline value + the absolute value of the ambient temperature fluctuation difference, the test result is judged to be an explosion, otherwise it is judged to be no explosion.

2. The method for quantitatively determining the friction sensitivity test result according to claim 1, characterized in that: In step 1, the BAM friction sensitivity meter (1) and the infrared thermal imager (2) maintain a test distance of 0.5 to 1 m.

3. The method for quantitatively determining the friction sensitivity test result according to claim 1, characterized in that: In step 2, the method for selecting non-flammable materials of the same texture is: for energetic organic crystal materials, non-flammable organic crystals are selected as the baseline; for energetic inorganic crystal materials, non-flammable inorganic crystals are selected as the baseline; for energetic polymer materials, non-flammable polymers are selected as the baseline; and for energetic liquid materials, non-flammable liquids are selected as the baseline.

4. The method for quantitatively determining the friction sensitivity test result according to claim 1, characterized in that: In step 2, the friction sensitivity test is performed no less than 3 times, and the result is the average value of the maximum difference of the temperature change curve.

5. The method for quantitatively determining the friction sensitivity test result according to claim 1, characterized in that: In step 4, the ambient temperature fluctuation difference is the ambient temperature fluctuation difference during the acquisition process of the infrared thermal imager (2).

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