Study Of The Temperature And Electromagnetic Environment On The Failure Of Aerial Ammunition

Aerial ammunition is an important military equipment of Air Force in combat. This article analyzes the environmental factors mainly temperature and humidity factors and electromagnetic environmental factors on the impact of ammunition, Based on the analysis on the domestic and foreign the phenomenon of ammunition failure and development of the ammunition failure theory, the paper studies the key factor and mechanism in failure on aerial ammunition and simulates its law. The central contents are as follows:(1) In view of the storage environment of China, the paper studies particularly the storage environment of aerial ammunition that affected by the temperature and humidity, electromagnetic environmental factors. The paper studies the main effects of the failure impacted on ammunition. Analyzing the rule of the humidity changes in sealed packaging in-house, and the relationship between temperature and humidity in conversion, pointed out that the external humidity in the low-frequency components is the main internal factors of affecting the internal sealed packaging and humidity, and that the mechanism of temperature and humidity, electromagnetic environmental factors, and bring forward the corresponding disposal methods and measures.(2) By use of fault tree analysis methods on the key components for the aerial ammunition, the number of cases are analyzed, and obtain the main factors of the storage ammunition that had led to the failure, it studies the failure mechanism and storage law such as explosive materials, fuses, bomb charge and electronic components detailly. Research shows that: it is deteriorated by the impact of temperature and humidity that Fuse, the explosive materials in the grain and electronic components, electronic components are also susceptible to damage by electromagnetic interference. After long storage, the body and its internal steel ball, spring, and other components are break down by the effects of the atmosphere and and other biological. By analyzing the natural environment effect of ammunition, the corrosion law of the ammunition materials is studied, and the corresponding protective measures is bringed up. Through analysis of Electroexplosive Device transient pulse test data, the temperature and humidity and Electromagnetic effect is the main failure factors of Electroexplosive Device.(3) For aerial bombs as an example, establish model based on finite element analysis software ANSYS, analyzes the ammunition influence by storage in the storeroom temperature with and without air-conditioning and storage in the field, obtain its temperature distribution and the distributing rule of points that inside body affected by temperature when storage in the storeroom and in the field, and if the temperature of the little-storage bomb is high than 60°C at open country, the performance will be affected or lose its capability. The results were compared with previous test data to verify the feasibility of the model, it have great significance for research on rule of ammunition storage.(4) Take a certain type of aerial rocket engines as the example, analyzes the shell, the insulation layer and grain interface points curve of temperature versus time by the load cycle of temperature, and temperature gradient changes on the path from inside to outside. The article calculates its stress-strain response caused by transient temperature field, identified the distribution of stress field and dangerous position of the grain. Researching aerial rocket engine thermal stress in the storage period, have a great significance on its structural integrity analysis and increase ammunition longevity.(5) Based on the react- model, to analyze the ambient temperature effect on the aging and aging rate, modeling the formula to predict the relationship of reliability and life and its modulus for solid propellant is deduced so as to provide the reference for prediction long-storage life of the ammunition.(6) Because electromagnetic environment has big impact on electronic equipment more, the article analyzed the influence of ammunition electronic equipment by lightning, electrostatic and radio frequency, and other electromagnetic environment, the article research the induced current of bridge wire-EED by high-frequency electromagnetic and electrostatic model and the harm to EED, and simulate the bridge wire and agent of the bridge wire EED heating temperature distribution by constant current and sinusoidal cycle current based on ANSYS. Obtain the bridge wire temperature changes differences in different sizes of constant current, in the current cycle of the sinusoidal excitation, temperature change of bridge wire and agent with the cycle current, and the temperature changes on the entire path, provides a theoretical basis for the design and storage, as well as to prevent accidents electric detonating of EED.