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This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The main objective of the project is to show that diffraction strain measurement, when complemented with numerical tools, can provide insights that traditional metallurgical methods cannot offer. In this project, we concentrate on issues concerning discontinuously reinforced metal and intermetallic matrix composites. We have studied load transfer between phases during loading, internal stress distribution during and as a result of inelastic stress relaxation (creep). We also studied the signatures of reinforcement fracture on the evolution of average elastic global strain, and used neutrons to study the micromechanics of slip in intermetallic composites. Of these subjects, we have found, most importantly, that the ratio of load partition in multiphase material does not stay as a constant; internal damage in composites leaves a distinct signature on the evolution of global average elastic strain; and, in reinforced low-symmetry materials, stress relaxation is dictated by the micromechanics of crystal slip, which cannot be accounted for by the continuum theory

The implications of diffraction in-situ loading macro-strain measurements in composites and finite element interpretations