Deformation analysis of boron/aluminum specimens by moire interferometryWhole-field surface deformations were measured for two slotted tension specimens from multiply laminates, one with 0 deg fiber orientation in the surface ply and the other with 45 deg orientation. Macromechanical and micromechanical details were revealed using high-sensitivity moire interferometry. Although global deformations of all plies were essentially equal, numerous random or anomalous features were observed. Local deformations of adjacent 0 deg and 45 deg plies were very different, both near the slot and remote from it, requiring large interlaminar shear strains for continuity. Shear strains were concentrated in the aluminum matrix. For 45 deg plies, a major portion of the deformation was by shear; large plastic slip of matrix occurred at random locations in 45 deg plies, wherein groups of fibers slipped relative to other groups. Shear strains in the interior, between adjacent fibers, were larger than the measured surface strains.
Document ID
19900044405
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Post, Daniel (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Guo, Yifan (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Czarnek, Robert (Virginia Polytechnic Institute and State University Blacksburg, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Subject Category
Composite Materials
Meeting Information
Meeting: Symposium on Metal Matrix Composites: Testing, Analysis, and Failure Modes