In this study, the viscosity of unidirectional carbon fiber reinforced thermoplastic (CFRTP) laminates near their melting point was evaluated to discuss the relationship between the thermal fusion conditions and the flow of the fibers and matrix. The laminates were regarded as a fluid flowing in the direction perpendicular to the fibers. The microscopic flow of the fibers and matrix was observed during a parallel plate compression test conducted near the melting point. On the basis of this observation, the viscosity and flow properties were evaluated by the finite element method (FEM). The results of the parallel plate compression test showed that the test conditions and the decrease in the thickness of the laminates are related to the apparent viscosity of the unidirectional plate. In addition, cracks in the direction of the maximum shear stress were detected via in situ observation near the melting point of the matrix. The occurrence of this phenomenon depended on the apparent viscosity of the unidirectional laminates, and it was found that no cracks occurred when the apparent maximum viscosity of the unidirectional laminates was lower than a threshold.

在这项研究中，评估了单向碳纤维增强热塑性塑料（CFRTP）层压板在其熔点附近的粘度，以讨论热熔合条件与纤维和基体流动之间的关系。层压板被认为是在垂直于纤维的方向上流动的流体。在熔点附近进行的平行板压缩试验中观察到纤维和基质的微观流动。基于此观察结果，通过有限元方法（FEM）评估了粘度和流动性。平行板压缩试验的结果表明，试验条件和层压板厚度的减小与单向板的表观粘度有关。此外，在基质熔点附近进行原位观察。该现象的发生取决于单向层压体的表观粘度，并且发现当单向层压体的表观最大粘度低于阈值时，不会出现裂纹。