Fig. 1

a The plot illustrates how the angle subtended by the contact area determines the location with the greatest possibilities of failure initiation for each of the three load geometries studied. b Correction factor that must be used with the CUR setup; the factor derived by Satoh (1986) and the one derived in this work are shown. c Correction factor that must be used with the CUP loading geometry; the factor derived by Tang and the one derived in this work are shown. d Correction factor that must be used with the FUP setup; the factor derived by Wang et al. (2004) and the one derived by Huang et al. (2014) are shown.