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S12 Impacto em Estruturas |
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Title:
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ALTERATION OF THE MODEL DESCRIBING THE STABILIZED HYSTERESIS LOOP
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Summary :
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ABSTRACT. THE EQUATION DESCRIBING THE STABILIZED HYSTERESIS LOOP IS BASED ON THE RAMBERG-OSGOOD RELATION FOR THE CYCLIC STRESS-STRAIN CURVE, AND EMPLOYS THE SAME COEFFICIENTS N?AND K? THIS MODEL IMPLIES THAT THE EXPANDED CYCLIC CURVE SHOULD COINCIDE WITH THE SHAPE OF THE HYSTERESIS LOOPS. IT IS SHOWN THAT AN ACCEPTABLE FIT IS NOT NECESSARILY OBSERVED. A STRUCTURAL AND AN OIL DRILL TUBE STEELS WERE LOADED UNDER ALTERNATING STRAIN CONTROL. STRAIN RANGED UP TO 1.8 %. AN ESTIMATE OF THE LOOP SHAPE BASED ON ONE VALUE OF THE EXPONENT N?IS NOT FEASIBLE. A BETTER FIT IS OBTAINED BASED ON TWO VALUES OF THE CYCLIC EXPONENT. THE RESULTS STRONGLY SUGGESTS THE DEPENDENCE OF THE DYNAMIC STRAIN HARDENING MECHANISM ON THE DEFORMATION RANGE. OPTIMUM CURVE FITTING REQUIRES ADJUSTMENT OF THE MODEL EQUATION.
KEYWORDS: HYSTERESIS LOOPS, MODELING, CYCLIC STRAIN HARDENING
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Author :
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Castro, Jaime T.
El-Sharawy, Hani H.
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Paper View :
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