Research Of Failure Mechanism And Analysis Method For MEMS Safety&Arming Device In Complex Mechanical Environment

It is an effective way to achieve miniaturization of fuzes with MEMS technologywhile an important direction is MEMS S&A device. Failure of MEMS S&A device is onekey issue which hinders its practical application. Because more special of its applicationbackground, little theory relate to failure analysis for MEMS S&A device has beenestablished while it is uncommon about failures reports of MEMS S&A device at homeand abroad, therefore, it is necessary to carry out research work for solving key technicalproblems in application of MEMS technology of fuzes with important significance.To make research of failures of MEMS S&A device in complex mechanicalenvironment, characteristics of load of the environment should be taken analysis at first,and the other things such as technological features, structural characteristics and the typicalmaterial properties of the product should also be considered, then failure modes andmechanisms of system would be studied to make a clear failure criteria. Timing failure andfunctional failure are identified to be the key failure modes of MEMS S&A device incomplex mechanical environment to analyze problems fully and effectively, whilefunctional failure is due to strength failure of device which caused by an overload of theenvironment and timing failure is caused by the timing role confusion of system.Then a practicable method for failure analysis is determined for study. According tothe characteristics of MEMS S&A device with reference to failure of MEMS device ofmechanical environment, a method for failure analysis to MEMS S&A device based onfailure tree analysis with pre-analytical model ideas is proposed in this paper, which canmake use of FAT with results of analysis on system designed to make a judgement aboutwhether failure happened.For the purpose of performance analysis of MEMS S&A device in complexmechanical environments, its response to different forces is examined with the method ofestablish mathematical model of the system. According to their own executive functions,MEMS S&A device is divided into some different units for independent analysis, andaction process of the units could be refined to movement or deformation of their keycomponents with simplifying the system, while the final performance of system could bereflected by response of the devices. In order to study the response of devices toenvironment load, the key components are classified to establish its corresponding models of mechanics or motion.And a typical MEMS S&A device (adopted by a small ballet of20mm caliber) istaken as an example to make failure analysis in complex mechanical environment with themethod above. Failure trees of both security and the role of process are established andexact failure criterions are clarified with the method of solving the minimal cut set.Resultsof computing with the models of key components would reflect response of the system tocomplex mechanical environment which could be used for making judgment for failure ofthe system.Finally, three-dimensional models of the typical MEMS S&A device are foundedwith ANSYS and ADAMS engineering software independently to make simulation analysisof its performance in complex mechanical environment, and both correctness of the mode land feasibility of the failure analysis method would be verified with simulation results.