Design, Analysis, Fabrication and Testing of Strain-Gauged Extensometer 陳英諺、劉勝安
E-mail: [email protected]
ABSTRACT
This study is mainly aimed at the design, analysis, fabrication, and testing of a strain-gauged extensometer normally required on a mechanical tensile or compressive test. First of all, an elastic sensing member, which utilizes the properties of a cantilever beam, is designed and subjected to finite element analysis using the commercial software COSMOSWORKS. Strain gauges are designed to be bounded on the appropriate locations of the members to form a full Wheatstone bridge. In order to obtain an output voltage as large as possible to ensure the measuring accuracy of this extensometer, different sets of design dimensions of the beam are taken for analysis. The stress limit is considered, and the final dimensions are determined. An extensometer is then fabricated and tested. The test data show that the results obtained based on the finite element analysis are consistent with the test results.
Keywords : strain-gauge, extensometer, finite element, cantilever beam, Wheatstone bridge Table of Contents
封面內頁 簽名頁 授權書 ... iii 中文摘要 ... iv 英文摘要 ... v 誌謝 ... vi 目錄 ... vii 圖目錄 ... ix 表目錄
... xii 符號說明 ... xiii 第一章 概論 ... 1 1.1 前言
... 1 1.2 伸長計的種類 ... 3 1.3 伸長計的基本特性與量度名詞 ... 7 1.4 研究動機 與目的 ... 12 1.5 研究目標與內容 ... 13 第二章 應變計式拉伸試驗伸長計的基本原理 ... 15 2.1 應變計式拉伸試驗伸長計的感測原理 ... 15 2.2 應變計諸特性 ... 21 2.3 基本電路 ...
30 2.4 感測彈性體的型式 ... 35 第三章 感測彈性體之分析設計與製作 ... 41 3.1 有限元素概述
... 41 3.2 應力與應變分量 ... 42 3.3 感測彈性體之有限元素分析 ... 45 3.4 最佳化設計 原理簡介 ... 54 3.5 感測彈性體設計實例與探討 ... 57 3.6 拉伸試驗伸長計製作與驗證 ... 76 第四 章 結論與建議 ... 84 4.1 結論 ... 84 4.2 建議 ... 86 參考文獻
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