臺灣博碩士論文加值系統

本文旨在觀察超音波振動輔助拉伸試驗之材料行為，探討超音波軟化效應的機制。本文首先建立超音波振動輔助材料軸向加載試驗系統，並探討不同拉伸速率、不同超音波加載時機以及不同超音波振幅對拉伸試驗之影響。研究結果顯示，本文之超音波系統具有材料軟化之效果，超音波加載於試片時，試片的塑流應力會隨之下降，其下降幅度與加載之超音波振幅成正比例關係；此外，透過實驗可以觀察出明顯的應力疊加現象，故其為超音波主要作用機制之一。

The objective of this paper is to observe the material behavior of specimens under ultrasonic vibration assisted tensile test and to explore the mechanism of acoustic softening effect. In this paper, an experimental tensile test system was designed and made, and the influence of different stroke speed, different ultra-sonic vibration applied timing and different ultrasonic vibration amplitude on tensile test was discussed. The results show that the ultrasonic vibration assisted tensile test system of this paper has effect on material softening. Flow stress of the specimens reduced when the ultrasonic vibrations were applied, and the amounts of flow stress reduction is proportional to the amplitude of the ultrasonic vibrations. Moreover, the obvious phenomenon of stress superposition was observed in this paper, so stress superposition is considered to be one of the main mechanism of stress reduction.

摘要 i
Abstract ii
致謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
第一章 緒論 1
1.1 前言 1
1.2 研究目的與動機 2
1.3 文獻回顧 3
第二章 基本理論 11
2.1 體積效應 11
2.2 表面效應 14
第三章 實驗設備與方法 23
3.1 實驗設備 23
3.1.1 材料試驗系統 23
3.1.2 應變擷取系統 23
3.1.3 應變規 24
3.1.4 超音波振動輔助拉伸系統 24
3.2 實驗方法 28
3.2.1 試片製作 28
3.2.2 實驗步驟 29
3.2.3 實驗條件 30
第四章 實驗結果與討論 48
4.1 拉伸速率對拉伸試驗之影響 48
4.2 加載時機對拉伸試驗之影響 50
4.3 超音波振幅對拉伸試驗之影響 50
4.4 超音波振動輔助拉伸之現象 51
4.4.1 衝擊效應 51
4.4.2 應力疊加作用 52
第五章 結論與建議 66
5.1 結論 66
5.2 建議 67
參考文獻 68

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