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The failure criterion at reentrant corners in brittle elastic materials presented in[1,2] validated in [3] for mode I loading is being extended to mixed mode loading and isbeing validated by experimental observations. We present all quantities involved in thecomputation of the failure criterion and validate it by comparison of the predictedcritical load and crack initiation angle to experiments on PMMA (polymer) and Macor(ceramic) V-notched specimens under mixed mode loading on.