摘要
采用短纤维增强尼龙6复合材料,对带有半圆形缺口平板制件的注塑成型过程进行了模拟。以制件半圆形缺口附件的5个单元为研究对象,分别获得了不同位置上纤维取向和制件脱模时应力沿厚度方向上的变化,深入讨论了模具外形、纤维含量变化对纤维取向以及残余应力的影响。研究结果表明,随着纤维含量的增加,纤维间相互作用系数Ci减小,取向程度升高,皮层取向厚度减小,芯层取向厚度增加;纤维含量越高,制品冷却时沿厚度方向的压力幅值越大,残余应力沿厚度分布幅值也越大;制件形状的改变,影响了熔体流经此处的流动状态,同时也影响了缺口附件纤维取向以及残余应力。
The injection processof notched plate with short-fiber-reinforced(SFR)polyamide compositeswas simulated by commercial software Moldflow. The five different elements in the proximity of the notch were studied to attain fiber orientation and stress distribution at ejection through the thickness, and the effects of fiber content and mold shape change on residual stressesin fiber reinforced injection molding were in-depth analyzed. Results show that with increase of the fiber content, the fibers interaction coefficient Cidecreases; larger values for Ci, tend to make the fiber orientation close to a random in-plane distribution whereas lower values predict a clear alignment in the flow direction; Cialso affects the thickness of the core and shell layers, decreasing the core and increasing the shell thickness as Ciis increased.As the fiber content increases, the magnitude of the coolant pressure and the residual stresses of the part through the thickness at ejection increase; fiber orientation and stress distribution are also affected by the cross-sectional shape change in the proximity of the notch.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2014年第4期127-131,138,共6页
Polymer Materials Science & Engineering
关键词
短纤维增强尼龙6
纤维含量
纤维相互作用系数
纤维取向
残余应力
short fiber reinforced polyamide
fiber content
fibers interaction coefficient
fiber orientation
residual stresses