Study On Mechanical Behavior Of Soft Materials Containing Hard Inclusions

With the continuous development of science and technology,the application of soft materials is becoming more and more extensive.Soft materials can be seen in many new technologies,which have also aroused the research interest of the majority of scientific researchers.In general,the fracture failure of brittle materials is usually attributed to the cracks in them,while the hard inclusion in soft materials may be considered as dangerous.Such contradiction between hard and soft materials can lead to stress concentration.Because of the nonlinearity of both geometry and physics of soft materials,it is difficult to deal with the fracture failure of soft materials effectively with the traditional linear elastic fracture mechanics.However,due to the complex boundary conditions and geometric models in practical problems,it is difficult to obtain the theoretical solution by existing research methods.Firstly,the material constants of 3D printed soft materials are measured by uniaxial tensile test.Then,soft material plates containing hard inclusions of different shapes are printed,and the tensile problems of the soft plates containing hard inclusions are studied by using Muskhelishvili complex function theory,finite element simulation of large deformation constitutions and experimental exploration,respectively.It can be found that the theory of linear elastic fracture reflects the essence of the problem to a certain extent.The soft materials have a large concentration of tensile stress along the stretching direction at the inclusion surface,which are prone to debonding and damage.However,near the sharp point of the inclusion in the other direction,the compression stress concentration is large,and the puncture of hard inclusion into soft material may occur.Finally,through finite deformation theory,the radial tension problem of the disk containing rigid cylindrical inclusion is studied,and the influence of the thickness of the disk on the stress concentration is studied by using the finite element analysis method.It is found that the radial stress of the soft materials at the interface gradually increased from inside to outside,and the stress concentration also increased as the thickness of the model increased.