EFEITO DA TENSÃO NOMINAL NO TAMANHO E FORMA DA ZONA PLÁSTICA / THE ESTIMATES OF THE SIZE AND SHAPE OF THE PLASTIC ZONES, TRADITIONALLY USED IN THE NOMINAL STRESS IN FRACTURE MECHANICS

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The estimates of the size and shape of the plastic zones, traditionally used in Linear Elastic Fracture Mechanics (LEFM), are based on the supposition that the stress intensity factor (SIF) KI (or KII or KIII) is the only necessary parameter to describe them. However, when the linear elastic stress analysis problem is solved in an Inglis plate, or the cracked infinite plate is analyzed using the stresses generated by the complete Westergaard function, it is verified that those traditional estimates significantly underestimate the position of the elastoplastic border. This happens because those solutions ignore the influence of the nominal stress on the stress field. However, as in most of the practical cases nominal stresses of up to 80% of the yielding strength are used, it is worthwhile to generate better estimates ahead for the plastic zones of the cracks, which are presented in this work.

ASSUNTO(S)

trincas mecanica da fratura fracture mechanics tamanho da zona plastica plastic zone size cracks

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