抄録
A new compressive test method using a specimen with a shape of hourglass for unidirectional carbon fiber reinforced thermoplastic composites was proposed and confirmed to be capable of evaluating its compressive strength in fiber direction and failure mode with high reliability. In addition, it was theoretically verified that the elastic-plastic shear property in out-of-plane laminated direction has a great deal of influence on the compressive strength by a proposed modified Budiansky's solution considering some defined elastic and plastic parameters obtained from the shear experimental result as well as kink band angle and initial fiber misalignment. From this point of view, a strong correlation between the out-of-plane shear property of unidirectional fiber composite and the mechanical property of its matrix resin suggests that the viscoelastic plasticity of the matrix resin determines the temperature-dependent compressive strength in fiber direction. In this study, a novel method is applied to compressive test at various temperatures, and temperature-dependent compressive failure mode is investigated. It is indicated that the proposed modified Budiansky's solution has a certain availability to establish the relationship between the compressive strength and the out-of-plane shear property of unidirectional thermoplastic composites at any different temperature.
