一种微尺度有序增强复合材料的制备及其力学性能表征

摘要

选择聚氨酯改性环氧树脂作为基体,利用微加工工艺制备了一种以电镀镍丝作为增强体的微尺寸有序增强聚合物基体复合材料。ANSYS有限元仿真结果表明基体完全包裹增强体能够很好地缓解应力集中,当增强体的排布角度为45°,体积含量为62.5%时,复合材料变形过程中应力集中程度相对最弱。对制备的微尺寸复合材料进行了DMA拉伸测试,结果表明相比单一的聚合物基体材料,有序增强复合结构材料的抗拉强度和弹性模量分别约提高了4倍和3倍,最后,通过扫描电镜观察了试样断口,对其拉伸断裂过程进行了合理分析。%Polyurethane modified epoxy resin was selected as matrix,an PMC reinforenced by micro-ordered electroplated nickel wire was fabricated through microfabrication.Results of ANSYS simulation show that matrix can relieve stress concentration if the matrix wraps up entirely on the reinforcement.The lowest stress concentration is generated in the deformation of composite when the angle of reinforcement is 45° and the volume content of reinforcement is 62.5%.Results of tension testing on DMA show that the tensile strength and elastic modulus of composite are 4 times and 3 times higher than the pure polymer,reasonable fracture processing has been analyzed by SEM.