https://scholars.lib.ntu.edu.tw/handle/123456789/60925
標題: | 微型疲勞試驗機 The miniature of fatigue test machine |
作者: | 林賢易 Lin, Hsien-Yi |
關鍵字: | 微型疲勞試驗機;疲勞;試驗機;裂縫生長;the miniature of fatigue test machine;fatigue | 公開日期: | 2006 | 摘要: | 機械材料測試疲勞斷裂,需經過反覆變動應力,經過相當多的次數,才會得到疲勞斷裂的實驗數據,在MTS材料試驗機下(油壓式),其最高頻率為20Hz,這對於都要到達幾十萬次至幾百萬次的金屬材料來說,需要相當長的一段時間,又受限機台本身相當大,Load Cell對於微小試片的應力感測,其靈敏度希望能提升許多,由微型疲勞試驗機的設計,能達到體積小、靈敏度高、頻率高等優點,能達到縮短實驗時間,觀察小試片的拉伸數據就能確知材料的疲勞情形,因為機台體積小,隨時都可測試小試片之疲勞情形。 本篇研究主要是針對微型疲勞試驗機進行設計,利用壓電材料工作頻率高、反應快和體積小等特性作為力量輸出裝置,並且對於各部位的設計和所使用的設備,進一步的說明。為了證明能在微型疲勞試驗機上拉伸出材料的疲勞性質,分別使用2014鋁合金、7075-T651鋁合金、304不鏽鋼和4340合金鋼四種材質的小型試片,在微型疲勞試驗機上進行實驗,並且與CT試片在MTS材料試驗機上的數據進行比較。 經過實驗之小試片,將其斷面經過SEM進行拍攝,由照片判斷其疲勞斷面的情形,將試片經過金相實驗,照相以記錄之;對於此次實驗經驗記錄下來,針對現有遇到之問題提出,作為日後工作的改進目標,讓微型疲勞試驗機能夠發展更完善。 The fracture behavior of the materials needs many cycles of cyclically tension to generate the data of fatigue. The maximum frequency of MTS (Material test system) is 20 Hz. It takes very long time on MTS for the fatigue experiments. The sensitivity of small specimen cannot be measured well and precisely by using MTS. There will be an anticipation to improve sensitivity by designing a miniature of fatigue test machine. Therefore, it will have the advantages of smaller size, higher sensitivity and frequency. Also, we can shorten the time of experiment, and we can know the condition of fatigue by this smaller testing machine better. This research is mainly for the miniature of fatigue test machine. There will be explanations on the applications of the actuator, the design and the equipment for each part. In order to manifest the qualities of the fatigue on the miniature of fatigue test machine, there are four small specimen ( 2014 Al alloy, 7075-T651 Al alloy, 304 stainless steel and 4340 alloy steel) used for testing. The data are compared with the data of the CT specimen on MTS. The experimented specimens were photographed by metallograph. The procedure and the difficulties encountered in this experiment are also recorded to help the development of the miniature of fatigue test machine to be more perfect. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/61176 | 其他識別: | zh-TW |
顯示於: | 機械工程學系 |
檔案 | 描述 | 大小 | 格式 | |
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ntu-95-R93522522-1.pdf | 23.53 kB | Adobe PDF | 檢視/開啟 |
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