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Mechanical Model and Constitutive Equation of a Composite Material

Chang Peng, Ding Yonggang

Abstract



Based on the experimental data from strength testing of Cement-based Material with Plant Fiber (CMPF) under uniaxial compression, the constitutive relationship and mechanical model of CMPF with different plant fiber contents are studied. With the increase of the straw fiber proportion, the small cracks are becoming popular and the destructive process is extended. Which suggests that Material ductility raises greatly. The results show that with the increasing of the fiber proportion, the density of CMPF decreased linearity. The declining trend of the cubic compressive strength is a parabolic curve. The strength declined quickly if the fiber content varies under 4%, and the trend is not obvious if the content varies from 4% to 6%. According to experiment curves, an equation for the constitutive relationship of CMPF is deduced with the plant fiber content from 4% to 6% under uniaxial compression. The given constitutive equations provide the basis for the nonlinear finite element analysis and the structural design.

Keywords


Mechanical model, stress-strain curve, constitutive equation, composite material, plant fiber.

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