【中英雙語】261關于殘余應力注塑模具設計有關的外文文獻翻譯成品：雙折射殘余應力和改進的注塑模具設計（中英文雙語對照）

1、此文檔是畢業(yè)設計外文翻譯成品（ 含英文原文+中文翻譯） ，無需調整復雜的格式！下載之后直接可用，方便快捷！本文價格不貴,也就幾十塊錢！一輩子也就一次的事！外文標題：Birefrengent Residual Stress and Improved Injection Mold Design外文作者：Jay C. Hanan文獻出處: Materials Science Forum Vols. 768-769 (2018) pp 217

2、-223(如覺得年份太老，可改為近 2 年，畢竟很多畢業(yè)生都這樣做)英文 2588 單詞，16489 字符(字符就是印刷符)，中文 4174 漢字。Birefrengent Residual Stress and Improved Injection Mold DesignKeywords: residual stress, injection molding, polyethylene terephthalate, pho

3、toelasticity.Abstract： Efficient manufacturing requires consistency. Automated equipment is designed to accept a small range of input variability and quickly sort and process for next steps. A case study for injection mo

4、lding 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-polariz

5、ed light, fringes 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 fr

6、inges 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 incr

7、easing the vent width.Introduction? Non-destructiveFor manufacturing applications measurement time is a particularly important advantage. Injection molding is the most common process used in the manufacture of plastic go

8、ods. It involves the melting of a given thermoplastic resin and subsequent fixed shaping and cooling of the molten plastic via predetermined molds. Historically, residual stress was ignored when reviewing injection mold

9、performance. Here residual stress was an important factor in determining what mold improvements were significant. Preforms and mold components. For the highest speeds in bottle packaging, preforms are required. Bottles a

10、re blown from the preforms. Preforms are generally injection molded Polyethylene Terephthalate (PET). PET is easier to recycle than HDPE and results in a clear high food quality container. There are three major component

11、s to preform molds.? Cavity? Thread Splits, or Neck Ring? CoreThe Cavity forms the external surface of the preform. This remains stationary throughout the molding process. Thread Splits form the threads, or finish, on th

12、e preforms and open and close on the core during and after the molding process. The Core forms the preforms inner surface and then carries the finished preform out of the cavity once the preform has cooled.Birefrengence.

13、 The polarizer and analyzer e ect on natural light and polarized light are well known. [6] Generally, when light waves come directly from a source, they are not polarized. When polarized, the electromagnetic vibration is

14、 restricted to one or two specific directions. If light is plane polarized, the components of the vibrations in some plane are transmitted or reflected to the exclusion of the other components. The intensity is reduced t

15、o one half in the most e cient polarizer. However, its rotation does not cause a change in intensity. Again, if a second polarizing device operates on the polarized light, it will transmit or reflect only the cosine comp