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.
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