Abstract: Compression property is one of the basic mechanical properties of materials, which determines the usage significance and scope of materials in engineering. To acquire the compression mechanical properties of forged carbon fiber reinforced epoxy composite (FCFREP) and laminated carbon fiber reinforced epoxy composite (LCFREP), the quasi-static experiments and split Hopkinson pressure bars (SHPB) experiments were performed, and the true stress-strain relationship at different strain rates were drawn. The failure types of the two materials were observed by scanning electron microscope (SEM), furthermore, the finite element analysis was used for dynamic compression simulation. The experimental results show that the strain rate effect of FCFREP is only reflected in the plastic stage, and it is a negative strain rate effect. However, the LCFREP has an obvious strain rate effect. With the increase of strain rate, its elastic modulus increases and yield point lags, and the flow stress increases. The SEM results show that the failure type of FCFREP under dynamic compression belongs to the fibers' tear and shear fracture, the matrix produces cracks to fragmentation, and dynamic compression failure type of LCFREP is shear fracture. The simulation results show that the dynamic compression of FCFREP can be described by bilinear constitutive model. The actual stress paths under dynamic compression of LCFREP are different from the simulation results, but their yield limit are the same. The true stress-strain curve obtained by experiments can be used as the basis for studying the new constitutive model, and it also provides a reference for the development of new numerical model.
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2021, Vol. 35 
