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

SÉRGIO GUSTAVO FERREIRA CORDEIRO; EDSON DENNER LEONEL; FRANCISCO ALEX CORREIA MONTEIRO

doi:10.1590/1679-78256002

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

Authors

SÉRGIO GUSTAVO FERREIRA CORDEIRO INSTITUTO TECNOLÓGICO DE AERONÁUTICA, 12228-900 SÃO JOSÉ DOS CAMPOS, SP, BRASIL HTTPS://ORCID.ORG/0000-0002-6826-5457
EDSON DENNER LEONEL UNIVERSIDADE DE SÃO PAULO, ESCOLA DE ENGENHARIA DE SÃO CARLOS, SÃO CARLOS-SP, BRASIL HTTPS://ORCID.ORG/0000-0002-7842-0334
FRANCISCO ALEX CORREIA MONTEIRO INSTITUTO TECNOLÓGICO DE AERONÁUTICA, 12228-900 SÃO JOSÉ DOS CAMPOS, SP, BRASIL HTTPS://ORCID.ORG/0000-0002-6015-1586

DOI:

https://doi.org/10.1590/1679-78256002

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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Published

2020-09-01

Issue

Vol 17 No 8 (2020) - MecSol 2019 São Carlos

Section

MecSol 2019 São Carlos

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