The Forcasting Research Of Mechanical Properties Of Fiber Reinforced Polymer Composite

Fiber reinforced polymer matrix composites is widely used because of the following advantages:light quality, high strength and modulus. Generally, it utilizes Laminated Plate theory to compute the mechanical property of fiber reinforced polymer products. Based on the condition of single orientation for fiber, Tandon-Weng model is mostly applied to forecast the mechanical property of fiber reinforced polymer products. For real injection-molded items, some technologies, such as adding flow channel, could provide single orientation for fiber, but with limit impact. Even for simple specimens, it is still difficult to obtain the above assumption. Therefore, it is impracticable to test and verify the accuracy of Tandon-Weng model. Accordingly, compared with simple specimens, it would be more difficult for complicated ones to calculating their mechanical property of fiber based on Tandon-Weng model. Considering the disadvantage mentioned above, it would be better to adopt finite element method for testing Tandon-Weng model’s accuracy. Therefore, this study would use this method together with global-used software for finite element analysis, Ansys, as the first step to test the calculating results of Tandon-Weng model in the three-dimensional case.Firstly, the study forecasts the mechanical property of composite material according to the computation program for Tandon-Weng model. Secondly, the Ansys software would be used to establishing a single inclusion three-dimensional finite element model for grid division. Then, according to different material properties of assigned units, it would add constrained condition and carry out stretching simulation, and acquire the result of its general mechanical property based on Hu He’s law. Lastly, with variable volume content, arrangement mode and draw ration, this study considers the simulation result as standard to test Tandon-Weng model’s accuracy. In conclusion, Tandon-Weng model has limitations in forecasting mechanical property of short-fiber reinforced polymer products with single orientation, and could not be used for all cases. However, this model is more accurate for testing particle reinforced composites with low volume. If the volume of particle reinforced composites is high, the forecasting effective elastic modulus would be smaller than the actual value, but with bigger passion. Furthermore, the error would bigger with increasing volume. For injection molding of short-fiber reinforced composite materials, Tandon-Weng model is good for testing periodic inform distribution of reinforced fiber on the basis of desired volume and fiber diameter. If the arrangement distribution is varied, its model could not provide accurate testing result. Considering the distribution random for short-fiber in injection modeling products, Tandon-Weng model could not reflect the microscopic distribution for short-fiber and could not accordingly provide uniform distribution model.