Abstract
Bioinspired discontinuous nanolaminate design becomes an efficient way to mitigate the strength-ductility tradeoff in brittle materials via arresting the crack at the interface followed by controllable interface failure. The analytical solution and numerical simulation based on the nonlinear shear-lag model indicates that propagation of the interface failure can be unstable or stable when the interfacial shear stress between laminae is uniform or highly localized, respectively. A dimensionless key parameter defined by the ratio of two characteristic lengths governs the transition between the two interface-failure modes, which can explain the non-monotonic size-dependent mechanical properties observed in various laminate composites.
Highlights
CAS Key Laboratory of Mechanical Behavior and Design of Materials,University of Science and Technology of China, Hefei, Anhui 230026, P
In 3D-printed laminated composites under uniaxial stretch the measured failure strain is found to decrease with the increase of the overlapping length, and they exhibit a brittle behavior wherein the propagation of the interface failure is catastrophic[36]
In most previous theoretic efforts based on interfacial fracture mechanics, the interface failure is considered as a crack
Summary
CAS Key Laboratory of Mechanical Behavior and Design of Materials,University of Science and Technology of China, Hefei, Anhui 230026, P. In 3D-printed laminated composites under uniaxial stretch the measured failure strain is found to decrease with the increase of the overlapping length, and they exhibit a brittle behavior wherein the propagation of the interface failure is catastrophic[36]. Our analytical results for the regularly staggered laminated structure show that the non-monotonic size effect of the interface failure is attributed to the propagation mode transition of the interface failure zone, which is a function of the overlapping length. Its formation can be roughly explained as the result of superposition of propagation of interface failure involving different overlapping lengths
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