CN-122015594-A - Method for testing shock resistance of industrial electronic detonator under high overload condition

CN122015594ACN 122015594 ACN122015594 ACN 122015594ACN-122015594-A

Abstract

The invention discloses an impact resistance testing method of an industrial electronic detonator under a high overload condition, and belongs to the technical field of initiating explosive device reliability testing. Aiming at the technical problem that the test results of the Hopkinson bar test and the simulated water pressure method cannot be directly compared, the invention provides a method for converting the water pressure method test conditions in industry standards into accurate Hopkinson bar laboratory loading parameter thresholds by taking the capacitor power-loss voltage as a common damage variable, respectively establishing quantitative mathematical relations between the capacitor power-loss voltage and impact pressure in the two tests, setting equivalent voltage conditions and deducing a conversion formula between the two pressures. The method realizes quantitative equivalence of two test systems for the first time, makes it possible to directly judge whether the product meets the industry impact resistance standard by using an efficient and controllable laboratory means, remarkably improves the test efficiency and economic benefit, and provides a new standardized way for reliability evaluation of industrial electronic detonators.

Inventors

REN DONGMEI
XIE TIANYU
LIU XIAOBAO
YIN ZHAOYANG
YANG ZHENZHEN
YANG LIU
HUANG GUOQIANG
LI BIN

Assignees

南京理工科技化工有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260109

Claims (9)

1. The method for testing the shock resistance of the industrial electronic detonator under the high overload condition is characterized by comprising the following steps of: S1, preparing a sample to be tested, namely providing an industrial electronic detonator to be tested, peeling off an outer cladding structure of an electronic control module of the industrial electronic detonator to be tested to expose an electrode of a solid electrolytic capacitor, and electrically connecting a voltage testing wire with the electrode; s2, performing a first loading test, namely performing impact loading on the sample under the condition of the impact loading of a Hopkinson bar, and collecting corresponding stress wave platform pressure data P shpb and capacitor end power-off voltage data V shpb ; S3, performing a second loading test, namely performing impact loading on the sample under an impact loading condition of an analog water pressure method, and collecting corresponding impact wave peak value pressure data P explo and capacitor end power-off voltage data V explo ; S4, relationship modeling, namely based on a plurality of groups of test data of the step S2 and the step S3, respectively establishing a first mathematical relationship between V shpb and P shpb and a second mathematical relationship between V explo and P explo by adopting a fitting method; S5, equivalent calibration, namely presetting a power-losing voltage value as an equivalent condition V 0 , substituting V 0 into the first mathematical relationship and the second mathematical relationship to be equal, and deducing a pressure equivalent conversion formula between P explo and P shpb ; S6, judging the threshold value, namely substituting a preset impact peak value pressure value corresponding to an analog water pressure method test condition based on an industry standard into the pressure equivalent conversion formula, calculating to obtain an equivalent Hopkinson bar impact loading condition parameter threshold value, and taking the parameter threshold value as a basis for judging whether the impact resistance of the industrial electronic detonator meets the standard.
2. The method for testing the shock resistance of an industrial electronic detonator under high overload conditions according to claim 1, wherein in step S3, the shock peak pressure data P explo is obtained by a pressure sensor arranged in a detonator shell, the pressure sensor is a PVDF piezoelectric film, and a sensitive surface of the pressure sensor is tightly attached to the inner wall of the detonator shell.
3. The method for testing the shock resistance of the industrial electronic detonator under the high overload condition of claim 1, wherein the first mathematical relationship and the second mathematical relationship are linear relationships.
4. The method for testing the shock resistance of an industrial electronic detonator under high overload conditions as claimed in claim 3 wherein the first mathematical relationship is satisfied by V shpb =0.02578×P shpb -6.1637 when P shpb is in the range of 207MPa to 591 MPa.
5. The method for testing the shock resistance of an industrial electronic detonator under high overload conditions as claimed in claim 3 wherein the second mathematical relationship is satisfied by V explo =0.65418×P explo -9.74121 when P explo is in the range of 13MPa to 28.5 MPa.
6. The method for testing the shock resistance of the industrial electronic detonator under the high overload condition of claim 1, wherein in the step S5, the pressure equivalent conversion formula is P explo =5.4687+0.03941×P shpb .
7. The method for testing the shock resistance of the industrial electronic detonator under the high overload condition of claim 1, wherein in the step S6, the preset test condition of the simulated water pressure method is a test condition that a single shot center detonator is detonated and a sample to be tested is 5cm away from the center detonator.
8. The method for testing the shock resistance of the industrial electronic detonator under the high overload condition as claimed in claim 7, wherein the method comprises the following steps: And S6, calculating to obtain the threshold value of the Hopkinson bar impact loading condition parameter which is 277.87MPa of stress wave platform pressure or 0.35MPa of corresponding nitrogen driving air pressure.
9. The method for testing the shock resistance of the industrial electronic detonator under the high overload condition of claim 1, wherein in step S6, the shock response is divided into a normal use area, a temporary explosion-proof area and a damaged explosion-proof area according to the power-off voltage data of the capacitor end and the functional state of the electronic control module, and the comprehensive judgment is carried out by combining the parameter threshold value.

Description

Method for testing shock resistance of industrial electronic detonator under high overload condition Technical Field The invention relates to the technical field of initiating explosive device reliability test, in particular to a method for testing the shock resistance of an industrial electronic detonator under a high overload condition, and especially relates to a method for quantitatively and equivalently calibrating a simulated water pressure method test standard and a Hopkinson bar laboratory test condition. Background The reliability of the industrial electronic detonator as a core detonating element in modern blasting engineering is directly related to the safety and effect of the whole operation. In an actual blasting site, the detonator is not only required to withstand the impact of an explosive explosion within itself, but is more often in a strong shock wave environment created by an explosion adjacent to the charge. The high overload impact load is extremely easy to cause the failure of a precise electronic control module (usually comprising a transducer, a capacitor, a control chip and the like) in the detonator, and the failure is particularly represented by the accidental power failure of the energy storage capacitor, so that the detonator is rejected and the serious engineering potential safety hazard is caused. Therefore, a set of scientific and reliable impact resistance testing and evaluating system is established, and is important for guaranteeing the reliable use of the industrial electronic detonator. Currently, two technical paths mainly exist in the industry for evaluating the impact resistance of an electronic detonator, but are independent of each other and have limitations. One path is a standard test method that is closer to the practice of the project, which may be referred to as an analog hydraulic method. The impact wave pressure curve generated by the method is closer to the actual blasting, and the evaluation result has high authority and is the current mandatory engineering standard. However, the impact load of the method is derived from the actual explosion of the explosive, the strength of the impact load is determined by factors such as the dosage, the distance and the like, and the impact pressure acting on the sample is difficult to continuously and accurately regulate linearly. Therefore, it mainly provides a qualitative or semi-quantitative determination of "pass/fail", which makes it difficult to realize accurate quantitative analysis of stress levels, and also makes it impossible to carefully distinguish and quantify the different degree of damage states of the sample near the failure threshold, thus limiting its use in intensive product performance studies and classification guidance. Another path is the hopkinson bar test commonly used in laboratory studies. The method utilizes the stress wave loading principle, can apply accurate, controllable and continuously adjustable high overload impact to the sample by adjusting parameters such as driving air pressure and the like, and has the remarkable advantages of good repeatability, easy quantification of parameters, high experimental efficiency and the like. The precise controllability enables researchers to establish quantitative mathematical relations between impact load and damage (such as capacitor voltage drop) of electronic elements, and is very suitable for carrying out mechanism research and performance screening on impact resistance rules of detonator electronic elements in the research and development stage. However, the stress wave pressure curve morphology (with distinct platform segments) and loading time scale produced by hopkinson bars are subject to substantial differences from the complex shock waves produced in their actual blast sites, resulting in their test environments being considered "dissimilar" to the actual situation. The core dilemma is that although the Hopkinson bar test can provide exquisite quantitative analysis data, the engineering significance of the data is unknown, and the test result cannot be directly used as the authoritative judgment basis of whether the product can withstand the field blasting impact due to different load mechanisms. Therefore, the two existing testing methods form an obvious technical paradox and industrial dilemma that the simulated water pressure method representing engineering authority standards is difficult to provide accurate quantitative analysis and damage classification, the deep value for guiding product optimization and engineering risk assessment cannot be fully exerted, and the Hopkinson bar method for providing quantitative damage analysis is good in the merit that the evaluation conclusion is not directly accepted by the standards. The core of the problem is that, due to the distinct load generation mechanisms, pressure time histories of the two methods, the industry generally considers their test conditions "incomparable", resulting in the l