Inverse Method for Estimation of Composite Kink-Band Toughness from Open-Hole Compression Strength Data

Borkowski, Luke ; Kumar, Rajesh S

关键词: COMPRESSION LOADS;    COMPRESSIVE STRENGTH;    FAILURE;    FIBER COMPOSITES;    IMPACT DAMAGE;    KINK BANDS;    LAMINATES;    MATHEMATICAL MODELS;    MODELS;    OPENINGS;    POLYMER MATRIX COMPOSITES;    TOUGHNESS;   

RP-ID  :  NF1676L-27309

学科分类：复合材料

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Fiber-reinforced polymer matrix composite materials can fail by kink-band propagation mechanism when subjected to in-plane compressive loading. This mode of failure is especially prevalent in compressive loading of laminates with holes, cut-outs, or impact damage. Most of the successful models for predicting compressive strength of such laminates require “fracture” toughness associated with kink-band propagation under in-plane compression. However, this property is difficult to measure experimentally, limiting the use of such models in design practice. In this paper an inverse method is proposed to estimate the kink-band toughness of the laminate from its open-hole compression strength data, which is an easier property to measure experimentally. Furthermore, a scaling relationship is proposed to estimate kink-band toughness for other laminate configurations of the same material.