权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Establishment of non-destructive measurement method for internal residual stress in plastics

塑料内残余应力无损测量方法的建立

基本信息

批准号：
21K18157
负责人：
梶原優介
金额：
$ 16.56万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Challenging Research (Pioneering)
财政年份：
2021
资助国家：
日本
起止时间：
2021-07-09 至 2024-03-31
项目状态：
已结题

项目摘要

本研究の目的は，プラスチック成形品の内部残留応力を三次元的に定量評価できる精密計測技術を確立することである．基盤となる物理現象は，樹脂内ポリマーの振動がテラヘルツ(THz)帯域にある点である．THz差周波光源，THz集光・偏光光学系を設計してTHz偏光計測装置を構築し，プラスチック成形品のTHz偏光依存性から内部残留応力の大きさ，向きをサブミリ空間分解能かつ非侵襲で定量評価可能な計測技術を実現・確立する．2022年度はまず，2021年度に設計したテラヘルツ偏光光学系を構築した．設計通り，0.3～3THzにおいて十分なS/Nが得られたほか，1 THzでビーム径が5 mm程度に絞られており，試料測定において十分なスペックが得られていることが分かった．次に，当該装置を利用して，1)成形試料に外力を印加した際のTHz偏光度変化，2)成形試料のTHz偏光度と内部残留応力の相関調査，を実験的に検証した．1)に関しては，PTFEのダンベル試験片を自作の引張装置にて引張力を印加しながら偏光度変化を調査した．結果，0.3～1 THzの領域において，弾性領域，塑性領域いずれにおいても引張力と偏光度に強い相関があることが分かり，かつ各領域においては線形な関係にあることも分かった．今後は応力と偏光度の関係の定量化を推し進める予定である．また2)に関しては，射出成形条件を変えて内部残留応力をコントロールした試料を複数準備し，成形後の偏光度を評価した．その後，成形試料を複数に切断して内部残留応力を開放し，その後の寸法変化と切断前の偏光度を比較することにより残留応力と偏光度の相関を評価した．結果，残留応力と偏光度に強い相関が存在することが定性的にではあるが得られている．本実験に関しても，今後定量化を推し進めて本研究の目的の達成を目指す．

The purpose of this study is to quantify the three-dimensional residual force in the plastic products, the precision technology is to make sure that the residual force in the plastic products is in the third dimension, the precision technology is used to make sure that the residual force in the plastic products is in the third dimension, and the precision technology is used to make sure that the residual force in the plastic products is three-dimensional. The basic equipment is the physical imaging system, the in-fat thermal vibration device (THz), the THz differential cycle light source, the THz polarized light collector design device, the THz polarizing device device, and the THz differential cycle light source. The residual power in the polarizing dependence system of the plastic THz is very high, and it is possible to analyze the non-intrusive quantitative analysis in the space of the polarization. in the year 2022, the polarizing Optics Department of the Department of polarizing Optics has been designed for the year 2022 and 2021, and the design profile is 0.3 ~ 3THz. 1 THz, the diameter is 5 mm, the size of the material is 5 mm, and the material is measured. For the second time, when the device makes use of the external force of the forming material, 1) the external force of the forming material increases the polarization of the THz, and 2) the internal residual force of the THz polarization of the forming material is different from that of the forming material. The PTFE device is self-made, the force of the device, the polarization of the instrument, the polarization of the polarization. the results show that the field of 0.3 THz, the field of sex, the field of plasticity, the force of polarization, the strength of polarization, the intensity of polarization, the strength of polarization, the intensity of polarization, In all fields, there are significant differences in the shape of the material. In the future, the polarizability is determined by the quantitative calculation. 2) after the injection of the forming condition, the internal residual force is measured, and the complex number of the material is prepared, and the polarization is measured after the forming. The residual force in the forming material is cut off by the complex number, and the residual force in the forming material is cut off by the post-cutting method. The polarization of the residual force is higher than that of the residual force. The results show that the residual force polarization is strong, and there is a good correlation between the residual force and the residual force. In the future, the purpose of this study is to achieve the goal of this study.