Bimaterial Interface Edge Characteristics And Its Finite Element Analysis

Along with all kinds of function material, complex material and other advanced material applied industry field extension incessantly extending, mechanical behavior of interface by different material forming, has been attached importance to by people more and more. Today, modern science and technology developing faster, no matter what macroscopical or microcosmic point of view, the interface problem is anywhere, and it has been one of technical difficulties that scientific researchers and engineering technique personnel must deal with. Interface of mechanical behavior of material or structure integer and basic material, so much as mechanical behavior of crystalloid interface, grain enganced body and basic interface, between object and basic interface, and capability design and exploitation of advanced material and accurately estimate of structure life, be provided with important significance.By a basal example, this thesis brought forward between different material interfaces, especially combinative part, would engender stress convergence phenomenon at interface part, and in elastic mechanics field, stress could be infinite, so it qualitatively introduced why combinative material destroyed from combinative interface edge beginning most. Last years, many scholar in the world researched interface problem, and put forward an important material parameter of combinative interface problem, ie, Dundurs parameter. Dundurs parameter was introduced in this thesis, and discussed value field of this parameter, and then coordinated to get two Dundurs parameter and equation of singularity exponent in point. As a right-angle combinative material interface edge, for the known material, we can solve singularity exponent, and we also can estimate that combinative material exists stress singularity or not. Now that combinative part must be stress convergence phenomenon, and only stress convergence is large enough, so at interface edge there will be more obvious plastic region appearing to combinative part cusp putting in plastic yield state. By following J integral and HRR educing process, control equation of double material interface edge stress distributing alone the angular direction is received, and according as displacement matching method, supplementary equation of different indurations exponent stress singularity exponent near interface edge is received, and then stress distributing alone the angular direction by the control equation is received. By finite element method, using computer simulates numerical value, and the results are as similar as stress distributing alone the angular direction in this thesis. Because of displacement matching method, a part of data is warp, but two results are more closed. Also, we can get supplementary equation of the same indurations exponent stress singularity exponent near interface edge.In the end of this thesis, an analytical method of double material viscoplastic interface edge stress singularity is brought forward, but it has no theory and method to solve or consult, and only fewness researchers have analyzed double material viscoplastic interface crack. So this thesis introduced finite element simulation to compare viscoplastic with plastic, and obtained stress scene distributing as similar.