FATIGUE LIFESPAN OF A FILLET WELDED JOINT – HYBRID APPROACH TO OBTAIN THE S-N CURVE WITH A REDUCED NUMBER OF TESTS
THIS PAPER INTRODUCES A HYBRID APPROACH TO OBTAIN S-N CURVES, WHICH COMBINES DATA FROM REDUCED NUMBER OF FATIGUE TESTS AND STATISTICAL SIMULATED USING A METHODOLOGY TO GENERATE SEVERAL S-N CURVES BASED ON THE FATIGUE PROPERTIES OF THE REFERENCE MATERIAL (MEAN CURVE WITH 50% RELIABILITY AND STANDARD DEVIATION) WITH THE MONTE CARLO METHOD, ALLOWING TO VALIDATE THE PERFORMANCE OF THE PROPOSAL, WHICH SHOWED GOOD ACCURACY AND REDUCES THE COSTS INVOLVED IN FATIGUE TESTING. FINALLY, AN APPLICATION FOR THE FATIGUE ANALYSIS OF A FILLET WELDED JOINT WAS DEVELOPED BASED IN FATIGUE TESTS AND FINITE ELEMENT ANALYSIS FOR CUMULATIVE DAMAGE AND FATIGUE LIFE COMPARISON BETWEEN THE PROPOSED METHOD AND NBR 8800 (2008). THE RESULTS OBTAINED IN PRESENT WORK FOR A FILLET WELDED JOINT SHOWED GOOD ACCURACY COMPARED WITH THE S-N CURVE ACCORDING TO STANDARD NBR 8800 (2008) FOR THE SAME WELD DETAIL CLASS, BOTH FOR FATIGUE LIFE AND FOR CUMULATIVE FATIGUE DAMAGE EVALUATIONS.
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