Reliability validation on spacecraft pyrotechnical devices using the hardened test method

A strength-stress model for the reliability of spacecraft pyrotechnical devices is proposed, based on the mechanical characters of the products and one-shot product reliability assessment theory. From this, a reliability validation method with small sample under hardened conditions was presented. In this method the products are tested under hardened conditions. If they can still work without failure under such conditions, then the reliability in normal conditions can be calculated by a series of formulas. It indicates that using this method, with the confidence level of 0.95, only less than 10 times trials are needed to validate the reliability of 0.9999~0.99999. Finally, the design of test under severe conditions was described.