Analysis Of Delamination Of Micro-Nano-Scale Multi-layered Materials

In recent years, both domestic and foreign scholars have conducted a lot ofresearch in material fields. They have made great progress in producing andusing nano materials, and have a good command of the characteristics of nanomaterial and its structure.With the decreasing of the material structure size, the ratio of structure areaand volume of nano materials increases due to the surface effect. Thischaracteristic makes the performance of the material change greatly in the workenvironment.On the other hand, nano material is made of many different kinds ofmonolayer materials in it, so these materials have higher temperature resistance,higher corrosion resistance and ratio of fracture toughness of highstrength/weight, lower friction and stronger wear. Due to the diversity of itsfunction and nature of the design, the micro nano multilayer materials’ researchis very important.In this paper, the surface elastic model is used to study the effects ofdelamination crack surface elasticity of micro nano monolayer and multilayerbeam based on the research of Gurtin, as well as the surface effects on thecracking nano delamination in case of large deformation. The control equationsand boundary conditions of nano beam large deformation theory of expression isobtained. Then, the approximate function solution of micro nano materials multibeam displacement is obtained by using the Galerkin method.Surface effect consists of two parts, they are surface residual stress andsurface elasticity. Wang and other scholars have analyzed the effects onmechanical properties by using the surface characterization of surface residualstress. In this paper, the surface elastic model is used to analyze the impact ofmicro nano material surface effect with beam scale changes to the materialcharacteristics. The effect of surface elasticity can be negligible if the length towidth ratio of nano beam specimen is very large. Meanwhile, the influence ofsurface elasticity with respect to the influence of small deformation will be moresignificant under the condition of large deformation.Promotion and application of micro nano scale multilayer material laminated structure provides broad prospects in various fields of nanotechnology.At the same time, cracking phenomenon happens more easily in the layeredsection of multilayer materials. To study the impact of the surface effects ondelamination multilayer materials, we focus on the factors of size and thicknessof multilayer materials ratio to analysis. Under the condition of smalldeformation, with the decrease of nano beam scale, the surface effect increasesgradually. Under the condition of large deformation, when the load is less than acertain range, with the increase of loads, the surface effects on nano beamdecreases rapidly. When the load exceeds a certain range, with the increase ofloads, the influences of surface effect showed a slow increasing trend.