Elastic-plastic fracture mechanics for two-dimensional stable crack growth and instability problems

摘要: An elastic-plastic fracture mechanics methodology for treating two-dimensional stable crack growth and instability problems is described. The paper draws on "generation-phase" analyses in which the experimentally observedapplied-load (or displacement) behavior reproduced a finite-element model. In these calculations number of candidate parameters are calculated material tested. quality predictions that can be made with tested "application-phase" analyses. Here, model used to predict different geometry, previously evaluated parameter serving as criterion growth. These applied compared measurements center-cracked panels compact tension specimens 2219-T87 aluminum alloy A533-B grade steel. work shows (COA) c , J dJ /da, linear elastic (LEFM)-R, sample large portions strain field, vary monotonically extension. However, (CTOA) R, G o F reflect state tip process zone, essentially independent amount when mode does not change. Useful, criteria therefore from at onset extension do have continuously measured during possibility making accurate extent load level demonstrated using only value