국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Development and Application of Benchmark Examples for Mode II Static Delamination Propagation and Fatigue Growth Predictions
저자	Krueger, Ronald
Keyword	ALGORITHMS;; CANTILEVER BEAMS;; CRACK CLOSURE;; DELAMINATING;; FATIGUE (MATERIALS); FINITE ELEMENT METHOD;; FLEXING;; FRACTURE STRENGTH;; MATHEMATICAL MODELS;; STATIC LOADS;; STRESS PROPAGATION
URL	http://hdl.handle.net/2060/20110023248
보고서번호	NASA/CR-2011-217305
발행년도	2011
출처	NTRS (NASA Technical Report Server)
ABSTRACT	The development of benchmark examples for static delamination propagation and cyclic delamination onset and growth prediction is presented and demonstrated for a commercial code. The example is based on a finite element model of an End-Notched Flexure (ENF) specimen. The example is independent of the analysis software used and allows the assessment of the automated delamination propagation, onset and growth prediction capabilities in commercial finite element codes based on the virtual crack closure technique (VCCT). First, static benchmark examples were created for the specimen. Second, based on the static results, benchmark examples for cyclic delamination growth were created. Third, the load-displacement relationship from a propagation analysis and the benchmark results were compared, and good agreement could be achieved by selecting the appropriate input parameters. Fourth, starting from an initially straight front, the delamination was allowed to grow under cyclic loading. The number of cycles to delamination onset and the number of cycles during delamination growth for each growth increment were obtained from the automated analysis and compared to the benchmark examples. Again, good agreement between the results obtained from the growth analysis and the benchmark results could be achieved by selecting the appropriate input parameters. The benchmarking procedure proved valuable by highlighting the issues associated with choosing the input parameters of the particular implementation. Selecting the appropriate input parameters, however, was not straightforward and often required an iterative procedure. Overall the results are encouraging, but further assessment for mixed-mode delamination is required.