Notch tip stress distribution in strain hardening materials |
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Authors: | R. C. Bates A. T. Santhanam |
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Affiliation: | (1) Westinghouse R & D Center, 15235 Pittsburgh, PA, USA |
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Abstract: | Using the results of elastic-plastic stress analyses for notched bars, it is shown that a modified form of slip-line field solution can satisfactorily explain the variation of longitudinal stress ahead of notch tips in strain hardening materials.
Résumé En utilisant les résultats d'analyses de contrainte élastoplastique dans le cas de barres entaillées, on montre qu'il est possible d'utiliser une forme simplifiée de solution du champ des lignes de glissement pour expliquer de façon satisfaisante la variation des contraintes longitudinales en avant d'extrémités d'entaille dans des matériaux susceptibles d'un écrouissage. Nomenclature yy longitudinal tensile stress in the notch tip plastic zone - xx transverse stress in the x-direction - zz transverse stress in the z-direction - k yield stress in shear - 0 yield stress in tension - 0* strain hardened yield stress (flow stress) - 0/*c flow stress at notch tip - total total strain pl plastic strain l principal strain - 1c maximum principal strain at notch tip - 1pl plastic strain in they-direction - 1cp1 E1pl at notch tip - eff effective plastic strain - ceff eff at notch tip - 0 yield strainC Stress decay constant in the notch tip region - /epl linear strain hardening rate - n strain hardening exponent in power hardening law - 2 flank angle of notch - distance from notch tip - p notch tip radius - kI applied stress intensity for Mode I loading - E Young's modulus - Vc crack tip opening displacement |
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