A Benchmark Example for Delamination Propagation Predictions Based on the Single Leg Bending Specimen Under Quasi-Static and Fatigue Loading

Krueger, Ronald ; Deobald, Lyle ; Gu, Haozhong

关键词: ALGORITHMS;    BENDING;    COMPUTER PROGRAMS;    CRACK CLOSURE;    DELAMINATING;    DESIGN ANALYSIS;    ELASTIC DEFORMATION;    FINITE ELEMENT METHOD;    FRACTURE STRENGTH;    STATIC LOADS;    STRAIN ENERGY RELEASE RATE;    STRUCTURAL FAILURE;   

RP-ID  :  NF1676L-29297

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Benchmark examples based on Single Leg Bending (SLB) specimens with equal and unequal bending arm thicknesses were used to assess the performance of delamination prediction capabilities in finite element codes. First, the development of the quasi-static benchmark cases using the Virtual Crack Closure Technique (VCCT) is discussed in detail. Second, based on the quasi-static benchmark results, additional benchmark cases to assess delamination propagation under fatigue loading are created. Third, the application is demonstrated for the commercial finite element code Abaqus Standard 2018. The benchmark cases are compared to results obtained from VCCT-based, automated quasi-static propagation analysis. A comparison with results from automated fatigue propagation analysis was not performed at this point since the current version of Abaqus does not include this capability under variable mixed-mode conditions. In general, good agreement between the results obtained from the quasi-static propagation analysis and the benchmark results were achieved. Overall, the benchmarking procedure proved valuable for analysis verification.