Formation and the effects of the thermo-residual stress on mechanical properties of the thermoplastic composites

摘要

The thermoplastic composites have widely regarded as high property structural materials for aerospace field for the excellent advantages, which were usually procured based on the moulding process under the high processing temperature and cooling rate. The thermo-residual stresses of the composites will be produced for the mismatch in thermal expansion coefficients between the fiber and matrix, as well as the anisotropy property of the adjacent layers of the plate and temperature gradient of the laminates structures having a certain thickness. The thermo-residual stresses play an important role on the mechanical properties of the obtained thermoplastic composites, which should be taken into consideration in the designing process. It will good to study the formation mechanism and the effects of thermo-residual stresses on the mechanical properties of thermoplastic composites to better utility and control its residual stress level. In present paper, the formation reasons of the thermo-residual stresses were firstly studies and analyzed from three different levels, the methods for controlling and decreasing the thermo-residual stresses were also discussed. In addition, the effects of the residual stresses on the thermoplastic composites properties were also studied from the aspects of dominating by the reinforcement and the polymer matrix.