Properties Prediction Of Brittle-Short Fiber Matrix Composites Based On Micromechanics Theory

Today,as the rapid development of modern science and technology, Whether from the perspective of macro-or micro-,can be said that the problem of the interface has become ubiquitous.It is one of difficulties for the technical scientfics and engineers which must be overrided.At the macro context,the combination of various structures and the department of the materials,such as film coating materials,coating interface,metal/ceramic bonding interface.Dissimilar metal bonding interface,the device features integration with the host interface component,composite latminates between layers so the whole structuer of the material or the mechanical behavior and even its performance has a very important and even dominant influence;The other hand, materials in the context of micro fiber and matrix interface,particle reinforced and matrix interface in mechanical behavior of advanced materials design and development of performance and accurate evaluation of structral life has an important significance.Bonding state is affected by aspects of materials used,the whole system is frail.Therefore,improving the mechanical properties often to improve the interfacial bonding state,which used to improved filler section between the matrix and the compatibility with and adhesion.Comprehensive and precise charactization of the nature is to understand the interface and thus to improve the basis for composite materials is important.Mullitef/M124F and fiber reinforced concrete are used in this paper, focusing on the thermal expansion properties of composite material in our country and abroad in a detailed overview of the profile of applications,and composites on the basis of research, combined with composite materials micromechanics analysis of inductive method,summarized a variety of complex domestic and international model of thermal expansion and progress.Second,this thesis is based on the micromechanics of composite materials, composite theory,we put forward the thesis theoretical model of thermal expansion.Through extensive literature collected,use of composite material,micromechanics analysis summarizes the method of the interface layer of composites material characterzation and geometric scale characterzation,derived interface thickness and diameter of short fiber composite material,the ratio of the average.Again,the thesis were prepared by squeeze casting mullite short fiber composites,using scanning electron microscopy and other modern materials analysis test method,the microstructure of mullite were some clear,a the thermal expansion properties of samples were tested for paper with using DIL402PC and laid a solid basis for experimental verification. The paper also used on the steel fiber reinforced concrete composites model to predict the thermal expansion,through access to information.Finally,a lot of work and study early based on the use of prediction formulas proposed in this paper calculated the theoretical value of thermal expansion model,a conclusion reached,Mullitef/M124F and steel fiber concrete composite predicted values of thermal expansion the experimental value better,show that the proposed composite thermal expansion model is correct. Candidate by Supervised by...