Abstract
Measurement of the linear fracture toughness of a ductile material requires large test specimens and, therefore, large testing machines. The tests become expensive and uncertain as regards application of the results to smaller cracks than those in the test specimens. A three-point bending test has been simulated with the aid of an elastic-plastic finite-element computer program. In addition to stresses and deformations the path-independent integral of J.R. R ice (1968) is determined numerically as a function of the applied load. According to K.B. B roberg (1971) this integral may be used to determine the onset of crack growth in cases where large-scale yielding takes place as well as in the elastic case. Thus, an interpretation is possible of small-scale tests in terms of a non-linear fracture mechanics theory. Comparison of the results is made with experiments performed on a medium strength steel.
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