Numerical Simulation of CFRP Thin-walled Tubes Subjected to Quasi-static Axial Crushing

Paper #:
  • 2017-01-0465

Published:
  • 2017-03-28
Abstract:
Carbon Fiber Reinforced Plastic (CFRP) tube is an important material for the lightweight design of automotive structures. Performance of a CFRP thin-walled tube subjected to quasi-static axial crushing was studied using numerical simulation. In order to increase the simulation precision, two important factors were discussed, (i) Methods of building the finite element model of CFRP thin-walled tubes subjected to quasi-static axial crushing were discussed. A material model considering the failure of composite materials was used. The simulation model was verified by using two specimens comprised of carbon fiber/epoxy unidirectional prepreg tape. (ii) Influence of the geometrical parameters of the crush trigger and six types of loading speeds on the simulation precision were analyzed. Based on the method of equal energy absorption, energy absorption performance of thin-walled circular and square tubes made four types of materials including mild steel, high strength steel, aluminum alloy and CFRP were also compared. Results showed that if the following measures were combined then the finite element model can well predict the true performance lamina bending and brittle fracture of CFRP tubes subjected to quasi-static crushing, (i) the CFRP thin-walled tubes under quasi-static crushing using two-layer model of shell elements combined with the MAT54 material model;(ii) crush trigger can be modeled by deleting elements;(iii)using a varying velocity as loading speed. Simulation results also compared very well with the experiments in terms of specific energy absorption, and error does not exceed 2%. The circular tubes have better energy absorption ability than the square tubes,and compared with steel, the energy absorption ability of CFRP affected by the shape of the cross section is smaller. Compared with mild steel, high strength steel and aluminum alloy, the weight reduction effect of CFRP can reach 75.08%, 69.78%, 41.12% respectively.
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