Abstract
The interface effect of nanoscale adhesive interlayer plays a significant role in force transfer in biological microjoint. In this letter, the authors adopted shear lag theory and Gurtin–Murdoch model to investigate the influence of two typical residual interface shears on stress distribution. The dominant governing equations of global interfacial shear stress are established using the stress jump across the interface and the continuity condition of interlayers. The transferred force is evidently reduced by the parabolic residual interface shear, and linear residual interface shear exerts no influence on the axial force of hard layer. This study might be helpful for the parametric investigation on stress transfer in a complicated microjoint and the interface design of nanocomposite.
Highlights
Staggered microstructure is related with the excellent mechanical properties of hard biological materials, such as nacre and bone.[1]
Considering the geometry of microjoint, shear lag theory combined with Gurtin–Murdoch model can be used to quantify how the coherent interface effect of nanoscaled adhesive interlayer influences the force transfer in microjoint
Given the stress jump across the plane interface induced by interface effects, the equilibrium condition of the Gurtin–Murdoch elasticity model at interfaces is written as follows:[10] tα + σαS β,β = 0, (5)
Summary
Staggered microstructure is related with the excellent mechanical properties of hard biological materials, such as nacre and bone.[1]. The overlap section of the staggered microstructure (shown in the dashed box) acts as a microjoint in force transfer.[2] Tensile stresses are channeled from upper platelet to lower ones through nanoscaled interlayers in microjoint. Misfit at interface to avoid introduction of interface elastic constants.[14,15] Considering the geometry of microjoint, shear lag theory combined with Gurtin–Murdoch model can be used to quantify how the coherent interface effect of nanoscaled adhesive interlayer influences the force transfer in microjoint. This letter aims to elucidate the planar force transfer mechanism of the nanoscale interlayers in microjoint. We obtain the stress distributions of the microjoint with two typical residual interface shears
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