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Effects of pulling speed on structural performance of L-shaped pultruded profiles

机译：拉动速度对L形覆膜型材结构性能的影响

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摘要

Pultrusion is a highly automated process for manufacturing structural composite elements, wherein the production rate depends on the pulling speed. This study analyzed the influence of pulling speed on the structural characteristics of pultruded glass fiber/epoxy-vinyl resin 75 x 75 x 6 mm L-shaped profiles. The profiles were pultruded at three pulling speeds: 200, 400, and 600 mm/min. After fabrication, the spring-in values of the fabricated profiles were measured; the profiles were examined under a microscope to identify and study their cracking; and the mechanical properties of the pultruded composite were determined. The spring-in was measured immediately after fabrication and then at intervals of two to three days over a 90 -day period. The springin angle was found to increase with increments in the pulling speed. The profiles produced at the lower pulling speeds (200 and 400 mm/min) exhibited no significant differences in matrix cracking or mechanical characteristics. By comparison, at the high pulling speed (600 mm/min), wherein a large part of the profile is polymerized after exiting the die, the formation of delamination perpendicular to the matrix cracks was observed. Furthermore, at this pulling speed, there were increased variations in the strength and Young's modulus values and decreased interlaminar shear strength.
机译：拉挤腾是制造结构复合元件的高度自动化过程，其中生产率取决于拉速。本研究分析了拉动速度对拉挤玻璃纤维/环氧树脂树脂结构特性的影响75×75×6mm L形型材。在三次拉伸速度下进行曲线：200,400和600 mm / min。制造后，测量制造型材的弹簧值;在显微镜下检查曲线以识别和研究它们的裂缝;并测定拉挤复合材料的力学性质。在制造后立即测量弹簧，然后在90℃时以两到三天的间隔测量。发现弹出角度随着拉动速度的增量而增加。在较低拉动速度（200和400mm / min）下产生的曲线表现出基质开裂或机械特性没有显着差异。通过比较，在高牵引速度（600mm / min）处，其中在离开模具之后聚合大部分轮廓，观察到垂直于基质裂缝的分层的形成。此外，在这种拉动速度下，强度和杨氏模量值的变化增加，并且层间剪切强度降低。

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