Research On Multi-scale Virtual Testing Of Resin Matrix Composite

It has been accepted that the mechanical properties of fiber reinforced polymercomposites have the characteristics of anisotropy, heterogeneity and diversity. Thedesign of the composite component is a semi-empirical design method andbuilding-block test has been widely used. To solve the high cost, poor reusabilityand the immaturity of the numerical simulation of composite building-block test, onthe basis of research at home and abroad, the paper carries out numerical simulationof mechanical tests across multiple scales. Thus, the paper achieves the integrationof physical experiments, virtual test and data processing, and furthermore itimproves the efficiency of mechanical tests of composite materials.On the basis of access to the composite molding process, the paper developsthe overall plan of multi-scale virtual testing. With reference to the ASTM standard,develop the laminate virtual testing of tensile properties, the in-plane shearproperties, interlayer performance and impact resistance. The interface andunidirectional composites virtual testing provide necessary parameters to the test oflaminate. The typical sample virtual test is used to study the influence of hole to theperformance of laminate. The modeling and simulation are completed by means ofthe software ABAQUS and the second development is done. Besides, the paperdesigned the overall framework of the system and integrated interface.The paper accomplishes numerical models of the single-fiber system,unidirectional composites, laminate and typical specimen. Take advantage ofcohesive elements to simulate the performance of interface. In the model ofunidirectional composites, utilize RVE to simulate the macroscopic properties.Moreover, the paper introduces progressive damage mechanics model to thenumerical model of laminates and refines the grid of hole feature in the numericalmodel of typical specimen.Accomplish the numerical simulation of multi-scale performance tests. Thepaper puts forward the method to calculate the strength and modulus of interface bycomparison of curves in the interface virtual testing. Besides that, present themethod to get the strength of unidirectional composites on the basis of stress oftipping point. In test of laminate and typical specimen, the paper presents the wayto express the capacity of material under different loading conditions. Bycomparison of the results of physical test and virtual test, the paper verifies therationality of numerical models. Based on the above technique, the paper designs the structure of software,establishes support database, and completes the system development with VisualC++. Accomplish the extraction and embedding of ABAQUS display window.Besides that, achieve the interaction with third-party software. At the end of thepaper, verify the feasibility of the system through tensile test of laminate with a hole.