Many studies have been carried out to relate KI and KII at fracture in biaxial loading. In the present investigation, the Mohr type of stress intensity factor (SIF) circles in uniaxial and pure shear type of loading are presented and discussed for the ‘no fracture’ relation between KI and KII for inclined cracks in biaxial loading. This ‘no fracture’ relation forms the lower bound for the fracture toughness relation between KI and KII. The experimental data points are seen to lie outside this lower bound for different materials.
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