No abstract

In the current environment there is a need to get material to the field faster and cheaper than ever before. This is leading to an emphasis on simulation instead of live fire testing. Additionally statistical methods are being employed to use sampling instead of full lot testing. Care must be taken in employing these methods though to ensure that the final product is as good if not superior to that obtained by traditional methods. This paper will present a method of simulated proof testing of mortar baseplates that is not only delivering high quality baseplates to the field in a timely fashion but is also saving large amounts of funding while doing so. 15. SUBJECT TERMS 16. SECURITY CLASSIFICATION OF: 17. LIMITATION OF ABSTRACT U 18. NUMBER OF PAGES 12 19a. NAME OF RESPONSIBLE PERSON

A rate of 0.3 failures per billion hours or less is desirable for memory components in large integrated arrays. This unusually stringent requirement complicates the determination of lifetime from accelerated aging studies. The value and limitations of step stress aging techniques are discussed in terms of experimental results obtained using plated wire memory arrays designed to withstand the high ambient temperatures required for accelerated aging. Step stress aging measurements alone are insufficient for confident lifetime prediction. Therefore, longer term measurements at lower temperatures must also be made to establish the validity of the lifetime extrapolations. It is essential to protect the plated wires against corrosion. Given proper protection a shelf life in the hundreds of years is forecast. The importance of duty cycle on lifetime in exercising the memory is discussed and the results of aging under extreme pulsed magnetic field stress conditions are reported. Criteria for wire selection, with long term stability in mind, are discussed.