论文部分内容阅读
目的研究PVDF及其氟化POSS纳米复合材料在单轴拉伸载荷下的损伤行为。方法首先依据实验结果和细观力学均匀化方法,建立纯PVDF和三种不同POSS含量PVDF/POSS纳米复合材料的颗粒掺杂有限元模型,并通过在实体单元之间嵌入可破坏的内聚力单元来模拟损伤。结果模拟得到的应力-应变关系与实验结果相吻合,证明了模拟结果的可靠性。损伤破坏的初始时间表明在破坏的初期阶段,POSS对于损伤有抑制作用,并且其效果随着POSS含量的增加而增强。损伤速度和最终的损伤面积和则表明质量分数在5%以下的POSS掺杂对于PVDF的损伤有抑制作用,并且随着POSS质量分数的增加其效果不断增强。当质量分数达到8%时,POSS的掺杂反而加速了PVDF的损伤。结论 POSS掺杂影响PVDF的损伤破坏,掺杂量对PVDF损伤破坏有抑制/促进作用,这一结果有助于理解实验所得到的力学参数的变化规律。
Objective To study the damage behavior of PVDF and its fluorinated POSS nanocomposites under uniaxial tensile loading. Methods Based on the experimental results and mesomechanical homogenization method, a particle doping finite element model of pure PVDF and three different POSS content PVDF / POSS nanocomposites was established. By embedding destructible cohesion units between solid elements Simulate damage. The stress-strain relationship obtained by the simulation results is in good agreement with the experimental results, which proves the reliability of the simulation results. The initial damage time indicated that POSS inhibited the damage in the early stage of damage, and its effect increased with the increase of POSS content. The damage velocity and the final damage area indicate that the POSS doping below 5% inhibited the damage of PVDF, and its effect was enhanced with the increase of POSS mass fraction. When the mass fraction reaches 8%, POSS doping accelerates the PVDF damage. Conclusions POSS doping affects the damage and destruction of PVDF. The doping amount has an inhibitory / promoting effect on the damage and destruction of PVDF. This result is helpful to understand the variation rule of mechanical parameters.