1、此文档是毕业设计外文翻译成品（ 含英文原文+中文翻译） ，无需调整复杂的格 式！下载之后直接可用，方便快捷！本文价格不贵,也就几十块钱！一辈子也就 一次的事！ 外文标题：Birefrengent Residual Stress and Improved Injection Mold Design 外文作者：Jay C. Hanan 文献出处: Materials Science Forum Vols. 768-769 (2018) pp 217-223(如 觉得年份太老，可改为近 2 年，毕竟很多毕业生都这样做) 英文 2588 单词，16489 字符(字符就是印刷符)，中文 4174 汉字。
2、 Birefrengent Residual Stress and Improved Injection Mold Design Keywords: residual stress, injection molding, polyethylene terephthalate, photoelasticity. Abstract： Efficient manufacturing requires consistency. Automated equipment is designed to accept a small range of input variability and quickly
3、 sort and process for next steps. A case study for injection molding of polyethylene terephthalate preforms for use in stretch-blow molding was presented. One convenient method for measuring stresses in optically transparent birefringent parts is photoelasticity. Using cross-polarized light, fringes
4、 proportional to the stress state were observed. Faster cooling improved the residual stress state in the injected preforms. The improvements were both in magnitude, as represented by the frequency of fringes and consistency, as represented by the improved symmetry of the fringes. Lower pressure in the mold also aided in improving the residual stress state. Reducing the pressure needed to inject was accomplished by increasing the vent width. Introduction New developments in injection molding equ
