Abstract
Considered in this work are the Mode I and III fractures of W18Cr4V steel, 60Si2Mn steel and PMMA specimens. The mixed mode critical stress intensity factor, denoted by K 1f, is shown to be greater than K 1c for Mode I. The ratio K 1f/ K 1c depends on the ways in which K 1 and K 3 interact and is affected by the position of the load with reference to the crack position. Analytical and experimental results are presented and discussed in connection with the microfracture surface observed experimentally.
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