臺灣博碩士論文加值系統

本文之研究目的為針對塑性壓柱成型分析定量摩擦應力之研究。以實驗的方法量測求取摩擦應力，並探討金屬塑性變形過程中，剛性區之分佈情況。本文利用網格印製表面，配合影像擷取及應變規之量測，同時考慮內部元素速度，以求取更精準之表面摩擦應力。本論文研究之結果可發現，剛性區隨時間增長，而範圍逐漸縮小，應力分佈則因剛性區轉變至塑性區而逐漸變小，但時間增長而側邊材料摺疊至底面，導致摩擦應力又隨半徑增加而變大。
本論文結論相似於Orowan所假設，但由於側面材料摺疊至底面，故外圍受到額外黏滯現象所產生之摩擦應力導致隨半徑的增加而摩擦應力也隨之改變。

This paper is proposed to establish a measurement system that use to analyze the friction surface. In this paper, the axisymmetric upsetting is presented as an example and the imaging measurement is adopted to illustrate this method. The paper is performed as three steps. The first step is imaging captured processes that include the processes of the setup the equipment of experiment, the preparation of specimen, the forging work and the recording of imaging. The second step is the imaging procedure that used to analyze the imaging of distorted grids. The final step is the analysis of friction stress that used to calculate the shear stress on friction surface. The results are shown that the rigid zone is contracted with the increases of the reduction of height.

中文摘要...............................................................................................Ⅰ英文摘要..................................................................................................Ⅱ
誌謝..........................................................................................................Ⅲ
目錄..........................................................................................................Ⅳ
圖表目錄..................................................................................................Ⅵ
符號索引..................................................................................................Ⅸ
第一章 緒論..............................................................................................1
1.1 前言........................................................................................1
1.2 文獻回顧................................................................................1
1.3 本文的研究範疇....................................................................2
第二章 基本塑性力學理論......................................................................4
2.1 基本理論.................................................................................4
2.1.1 Tresca降伏理論.................................................................4
2.1.2 von-Mises降伏理論...........................................................5
2.1.3 應力-應變關係式................................................................6
2.2 常用之金屬塑性加工理論解析方法.....................................8
第三章 摩擦應力分析............................................................................14
3.1 速度場...................................................................................14
3.2 應變規轉換半徑...................................................................16
3.3 應變規轉換半徑之校正.......................................................17
3.4 摩擦應力...............................................................................18
第四章 實驗方法與步驟........................................................................22
4.1 實驗材料...............................................................................22
4.2 影像與應變規之量測原理...................................................22
4.3 實驗設備...............................................................................23
4.4 實驗模具...............................................................................24
4.5 潤滑油...................................................................................25
4.6 手銲槍、導線.......................................................................25
4.7 實驗過程...............................................................................25
4.8 實驗資料整理.......................................................................26
第五章 結果與討論................................................................................44
第六章 結論與未來展望........................................................................66
6.1 結論.......................................................................................66
6.2 未來展望...............................................................................67
參考資料..................................................................................................68
附錄A......................................................................................................71

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