1146 形状記憶合金 TiNi ファイバ強化 /CFRP 複合材料のき裂閉鎖作用

概要

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In this paper, the TiNi fiber reinforced / CFRP composites were developed. Various levels of prestrain ε=0,l, 3,and 5% were applied to the embedded TiNi fiber, the thin layer of photoelastic material was coated on the surface of the specimen, and then the specimens were processed with a pre-crack on one side. Tensile tests under constant 1oad were carried out for the specimens made of this composite. The reduction effect of the stress concentration, enhancement of mechanical properties and resistance of deformation of the specimens were investigated, and action of the crack closure due to the shape memory effect was studied by using the reflection photoelasticity method. Stress intensity factor K value was determined by using reflection photoelasticity to examine the crack clousure effect of the specimens. It was confirmed that the effect of crack closure is attributed to the compressive stress field in the matrix due to shrinkage of the TiNi fibers above austenitic finishing temperature (A_f).
社団法人日本機械学会の論文
2003-09-23