摘要
对 GMT/PP圆盘试样在平行平板模间进行了轴对称 2 0 0℃等温挤压流研究 ,由 Instron试验机自动记录挤压过程中挤压力与合模速度和位移的关系。认为 GMT基本上是各向同性的 ,除紧贴模具的树脂层无滑移外 ,其中的玻纤层均匀变形 ,厚度方向速度分布为平推流。获得了挤压流的流变学参数 ,并用拉伸流模型模拟了挤压力的变化历程。
The isothermal compression molding at 200 ℃ of polypropylene/glass fibre mat thermoplastic(GMT) was investigated between parallel circular plates on a 100 kN Instron test machine to characterize the rheological parameters for squeezing flows of the material. Constant plate velocity squeezing flow tests was carried out to cover a range of closing speeds. In plane flow of circular specimens was found to be uniformly extension. The deformed shape was still circular. The overall squeezing force/displacement was recorded automatically. The evolution of the compression force is modeled as biaxial extensional flow, with apparently negligible shear flow effects. The rheological power law exponential n is equal to 0.45 and extensional constant A e=1491600+317278 h .
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2002年第2期107-111,共5页
Polymer Materials Science & Engineering
