试样厚度对碳纤维复合材料拉伸力学性能的影响

本文对两种不同厚度的碳纤维复合材料进行了力学性能试验,并对其断裂过程及性能进行了对比分析。结果表明:厚度为1.40 mm的碳纤维复合材料比厚度为3.00 mm的碳纤维复合材料力学性能优越,其断裂后的纤维股比较细,纤维股完全发生断裂,贡献出其所有的应力;而厚度为3.00 mm的碳纤维复合材料断裂后的纤维股都比较粗,纤维辅层之间未能完全发挥到其极限应力。厚度为1.40 mm的碳纤维复合材料比厚度为3.00 mm的碳纤维复合材料的抗拉强度平均提高了65%;弹性模量提高了8.8%;延伸率提高了0.5%。

Effect of Thickness on the Tensile Properties of Carbon Fibre Reinforced Composite

Mechanical test was carried out on the carbon fibre reinforced composite with different thicknesses,and the process of cracking and the mechanic properties were analyzed.The results manifested that for the specimen with the thickness of 1.40 mm,the fibre strands on the fracture were very fine and completely broken indicating that the fibre had been fully strained,the tensile strength of the specimen was 3 050 MPa,elasticity modulus was 156.5 GPa,and ductility was 1.7%,while for the speumen with the thickness of 3.0 mm,the fibre strands were coarse.As there was no strain within the coarse fibre strands,the overall mechanic properties were much low with tensile strength 1847 MPa,elasticity modulus 143.8 GPa,and ductility 1.2%.Compared to the later specimen,tensile strength of the former specimen was enhanced by 65%,elasticity modulus by 8.8%,and ductility by 0.5%.