Reliability Studies of Materials Using Several LSI-11 Based Systems

摘要

Valid predictions about the reliability of materials require tests on a large number of samples. The materials must undergo a number of different types of load histories in order to make an accurate definition of the damage function. At LLNL, a test facility was designed that allows material testing of strength and life to be done at the different load histories. The facility uses several LSI-11 microcomputers as multichannel data acquisition systems. Currently, each system operates independently using floppy disks as program and data storage. The floppy disks containing the data are hand carried to a PDP-11/60 minicomputer for data analysis. Each system uses an analog-to-digital (A/D) converter selected to best fit the characteristics of the signal being measured; i.e., a high-speed direct memory access (DMA) A/D for signals with fast rise times, an integrating A/D for signals with an ac component, etc. How the Mechanics of Materials Test Facility is implemented is described. (ERA citation 06:022448)