工艺与制造英文2021被引 18
不同牵引速度下拉挤L形型材回弹变形分析：数学模拟与实验结果
Analysis of Spring-in Deformation in L-shaped Profiles Pultruded at Different Pulling Speeds: Mathematical Simulation and Experimental Results
Alexander Vedernikov, Alexander Safonov, Fausto Tucci, Pierpaolo Carlone, Iskander Akhatov · University of Salerno
摘要整理
拉挤成型工艺的特殊性导致回弹变形的产生，其大小与牵引速度密切相关。本文对玻纤/乙烯基酯树脂L形型材（75×75×6 mm）在200和600 mm/min两种牵引速度下的拉挤成型过程进行了实验和数值分析。型材在常温冷却后当天测定回弹角度。研究表明，牵引速度越高，回弹角度越大。建立了考虑复合材料热化学和力学行为的二维数值模型，采用ABAQUS软件进行求解。采用固化硬化瞬时线性弹性（CHILE）本构模型描述基体树脂杨氏模量的演变过程。由于型材同时采用单向（UD）粗纱和织物材料，采用自洽场微观力学（SCFM）方法计算UD层和织物层的有效力学性能。实验和数值模拟得到的回弹角度进行对比，相关性良好：在200 mm/min和600 mm/min牵引速度下的误差分别为12.6%和6%。研究结果为优化拉挤工艺参数、控制型材尺寸精度提供了理论依据。
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