An Engineering Approach to Analyze Damage Initiation Modes in Tapered Composite Structures

Rao, Prabhakar M ; Palliyaguru, Upul R ; Gurvich, Mark R ; Seneviratne, Waruna

关键词: AIRCRAFT STRUCTURES;    COMPOSITE STRUCTURES;    CRACK INITIATION;    CRACK PROPAGATION;    CYCLIC LOADS;    DAMAGE ASSESSMENT;    DELAMINATING;    DESIGN ANALYSIS;    DISCONTINUITY;    RESINS;    STATIC LOADS;    STRUCTURAL ANALYSIS;    STRUCTURAL DESIGN;    THREE DIMENSIONAL COMPOSITES;   

RP-ID  :  NF1676L-29339

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来源: NASA Technical Reports Server

【 摘 要 】

In this work an engineering approach is demonstrated for analyzing damageinitiation modes in tapered composite structures. The analysis methodology includessimulation of the non-linear static response of tapered composite structures understatic tension loads to predict the location of interfacial delamination initiation.Furthermore, the developed methodology provides a strength-based criterion to assesswhether damage initiation will occur in the inter-laminar delamination or intra-laminarmatrix cracking mode. Based on the results of the analysis, a tapered compositestructure is fabricated and tested under displacement-controlled quasi-static tensionloading. The damage initiation location captured experimentally is compared with theanalysis towards achieving preliminary qualitative validation. The linear stiffness ofthe tapered composite structure is predicted within 15% of the experimental averagethereby achieving preliminary quantitative validation.