Applied Mathematics and Mechanics >
Bending strength degradation of a cantilever plate with surface energy due to partial debonding at the clamped boundary
Received date: 2024-04-29
Online published: 2024-08-27
Supported by
the National Natural Science Foundation of China(12372086);the National Natural Science Foundation of China(12072374);the National Natural Science Foundation of China(12102485);Project supported by the National Natural Science Foundation of China (Nos. 12372086, 12072374, and 12102485)
Copyright
This paper investigates the bending fracture problem of a micro/nanoscale cantilever thin plate with surface energy, where the clamped boundary is partially debonded along the thickness direction. Some fundamental mechanical equations for the bending problem of micro/nanoscale plates are given by the Kirchhoff theory of thin plates, incorporating the Gurtin-Murdoch surface elasticity theory. For two typical cases of constant bending moment and uniform shear force in the debonded segment, the associated problems are reduced to two mixed boundary value problems. By solving the resulting mixed boundary value problems using the Fourier integral transform, a new type of singular integral equation with two Cauchy kernels is obtained for each case, and the exact solutions in terms of the fundamental functions are determined using the Poincare-Bertrand formula. Asymptotic elastic fields near the debonded tips including the bending moment, effective shear force, and bulk stress components exhibit the oscillatory singularity. The dependence relations among the singular fields, the material constants, and the plate's thickness are analyzed for partially debonded cantilever micro-plates. If surface energy is neglected, these results reduce the bending fracture of a macroscale partially debonded cantilever plate, which has not been previously reported.
Zhenliang HU, Xueyang ZHANG, Xianfang LI . Bending strength degradation of a cantilever plate with surface energy due to partial debonding at the clamped boundary[J]. Applied Mathematics and Mechanics, 2024 , 45(9) : 1573 -1594 . DOI: 10.1007/s10483-024-3140-7
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