THE STRESS INTENSITY FACTOR ASSESSMENT IN THREE-DIMENSIONAL PROBLEMS BY THE DISPLACEMENT FITTING TECHNIQUE AND THE DUAL BOUNDARY ELEMENT METHOD

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SÉRGIO GUSTAVO FERREIRA CORDEIRO
EDSON DENNER LEONEL
FRANCISCO ALEX CORREIA MONTEIRO

Abstract

THIS WORK PRESENTS AN EXTENSION OF THE DISPLACEMENT FITTING TECHNIQUE IN ORDER TO ASSESS THE STRESS INTENSITY FACTORS OF THREE-DIMENSIONAL LINEAR ELASTIC FRACTURE PROBLEMS USING THE DUAL BOUNDARY ELEMENT METHOD. THE DEVELOPED FRAMEWORK ACCOUNTS FOR HIGHER ORDER TERMS OF THE ASYMPTOTIC NEAR CRACK FRONT DISPLACEMENT SOLUTION. REGARDING THE DUAL BOUNDARY ELEMENT METHOD, IT IS SHOWN HOW THE NUMBER AND LOCATION OF POINTS NEAR THE CRACK FRONT CAN BE PROPERLY SET TO OPTIMIZE THE EVALUATION OF STRESS INTENSITY FACTORS. THREE-DIMENSIONAL BENCHMARK CRACK PROBLEMS DEMONSTRATE THE EFFECTIVENESS OF THE PROPOSED TECHNIQUE. TWO DIFFERENT CRACK GROWTH CRITERIA WERE CONSIDERED TO EVALUATE THE PROPAGATION ANGLES AND THE EQUIVALENT STRESS INTENSITY FACTOR. THE HIGHER ORDER TECHNIQUE HAS DEMONSTRATED TO BE MORE ACCURATE AND LESS SENSITIVE WITH RESPECT TO THE EXTRACTION DISTANCES IN COMPARISON OF THE CONVENTIONAL DISPLACEMENT FITTING TECHNIQUE.

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MecSol 2019 São Carlos

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