End effect and cut strategy of single-oriented one-dimensional fiber composites with high thermal conductivity

Abstract

Fiber composite materials with high thermal conductivity are increasingly important in practical applications, particularly for efficient heat-dissipating shell packaging materials. This paper uses random position generation and finite element simulation to investigate the end effect in single-oriented one-dimensional fiber composites, significantly reducing their thermal conductivity. The analysis of the end region reveals that the end effect is caused by the deviation in fiber number at both ends of the composite material. A relationship between the end region thickness, fiber length, and composite thickness is established. A new optimal end-cutting strategy is proposed to enhance thermal conductivity by simulating the representative volume element. This strategy can improve the thermal conductivity by up to five times. Additionally, a new model for calculating the thermal conductivity of single-oriented fiber composites is presented. The model was experimentally validated by testing the thermal conductivity of a prepared sample, showing an error rate of less than 3 %, thereby confirming the model's accuracy.