Studies on Deformation and Fracture of Viscoelastic Composite Materials.

摘要

Theoretical and experimental work on the deformation and fracture of structural composite materials, is summarized. Research on limited path-independence of work for inelastic laminates under axial and torsional loading and unloading is summarized first. These studies on pure axial loading, pure torsional loading, and combined axial-torsional loading provide support for the theoretically predicted path-independence of work for limited deformation paths. This path-independence is shown to be helpful in the development of simplified methods of deformation and fracture characterization and analysis. Summarized next is research on delamination of multidirectional laminates. It is concerned with (1) delamination testing, (2) moment-curvature testing to obtain the J integral, (3) extensions of the J integral analysis, (4) fractography and delamination in the SEM, and (5) analysis of width effects and crack front curvature effects in the double cantilever specimen. Keywords: Fiber-reinforced plastic; Fiber reinforced composites. (KT)