A machine vision photogrammetric measurement system was developed for use in micromechanics research on materials. The system uses a scanning electron microscope, image processor, graphics terminal, video monitor, and an associated computer to determine displacements and strains surrounding cracks and to display results graphically. Pictured is the mapping of dispacement near a crack (heavy black line) in a silicon carbide reinforced aluminum alloy composite during a tensile test.

The mechanisms of high temperature creep damage accumulation in ceramic materials are being investigated. The photograph shows creep-induced cavities on the grain boundaries of magnesia-doped aluminum oxide.

A scanning electron microscope reveals how silicon carbide fibers (exposed by electropolishing) in titanium alloy help arrest a fatigue crack under load.