A bending-to-stretching analysis of the blister test in the presence of tensile residual stress

The constitutive relation of an axisymmetric detached coating on a rigid substrate

“…2 and 3 show the constitutive relation and the corresponding power n in case a/b¼12.5, respectively. The constitutive relation can be recast into Ppw n 0 with n ¼1-3, which is consistent with other reports [6,8,12,13]. The behavior of the coating is dominated by bending at small deflection and by stretching at large deflection.…”

“…As suggested by some literature [4,6,9,12,13], the constitutive relation between P and w 0 can be written as Ppw n 0 with n ¼ ðdðlog PÞÞ=ðdðlog w 0 ÞÞ. Then U E can be recast into…”

“…In the blister test, a concentrated load or pressure is applied on the coating surface to deflect the axisymmetric detached coating [1][2][3][4][5][6]. The constitutive relation between the external force and deflection of the detached coating can be obtained by the technique and used for studying the system's mechanical properties, e.g.…”

Analysis of energy release rate and bending-to-stretching behavior in the shaft-loaded blister test

“…Axisymmetric quadratic shell elements were adopted to model the film under central loading configurations. Biased meshes were constructed at the boundaries of the membrane, using a length ratio between adjacent elements of 1.25 (Guo et al, 2005). A blister with a radius of 25 mm, thickness of 0.1 mm and Young's modulus of 4 GPa was modeled in the numerical simulation.…”

“…The G value is calculated by the product of nodal forces at the crack tip and the rel-1 ANSYS is a commercial FEA package developed by ANSYS, Inc. ative displacements between the adjacent nodes on the crack faces. The technique determines the nodal forces by placing spring elements between the node pairs at the crack tip, and requires an elaborate fine mesh at the crack tip to generate a converged G value (Guo et al, 2005). Results have been plotted in Figs.…”