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The verification and validation (V&V) of a fracture mechanics life prediction computer code is an essential task. The confidence level of results is directly related to the effort invested in the V&V process. The V&V process of life prediction software is broken two major parts: computer code assessment and fracture mechanics assessment. The fracture mechanics assessment is divided into three V&V tasks: fracture mechanics parameters, baseline predictions, and advanced predictions. The details of validating the stress intensity factor solution for a surface crack in a finite plate is discussed. Example V&V results are reported for NASCRAC Version 2.0 and NASA/FLAGRO Version 1.3. NASCRAC has significant errors in implementing a fatigue crack growth algorithm. In addition, the surface crack stress intensity factor solution in NASCRAC does not agree well with established analytical and experimental benchmark results. NASA/FLAGRO has computer coding problems which affect its portability.
Software verification and validation, fatigue crack growth, fracture mechanics life prediction, surface cracks, crack shape evolution, local stress intensity factor, average stress intensity factor
Graduate Student, The University of Tennessee, Knoxville, TN