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研究生:游愷迪
研究生(外文):Kai-Ti Yu
論文名稱:發泡材料在變速率衝擊下材料壓縮性質分析與緩衝效應評估
論文名稱(外文):EVA Foam Compressive Mechanical Property Analysis and Buffering Effects at Different Impact Velocities
指導教授:劉德騏
指導教授(外文):De-Shin Liu
口試委員:陳坤男羅本喆林派臣
口試委員(外文):Kun-Nan ChenBen-Je LwoPai-Chen Lin
口試日期:2013-07-25
學位類別:碩士
校院名稱:國立中正大學
系所名稱:機械工程學系暨研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2013
畢業學年度:101
語文別:中文
論文頁數:75
中文關鍵詞:有限元素法掉落衝擊試驗速率效應發泡材料
外文關鍵詞:Finite Element MethodDrop TestStain Rate EffectFoam Material
相關次數:
  • 被引用被引用:6
  • 點閱點閱:928
  • 評分評分:
  • 下載下載:109
  • 收藏至我的研究室書目清單書目收藏:0
發泡材料普遍地應用在現今人類生活中各個領域包含車輛載具、建築工程、運輸包裝等,其功能主要為吸震與緩衝,並用以保護物體結構或人體免於受損傷害,而本研究則探討用於運動鞋中底的材料乙烯/醋酸乙烯酯共聚物(Ethylene Vinyl Acetate,簡稱EVA),由於人體運動或衝撞產生不同的衝擊速度,單一掉落高度撞擊試驗並無法模擬出試片不同速率下衝擊與回彈特性,因此本研究建立一套評估發泡材料在不同速率衝擊下緩衝性質的方法,並應用有限元素法搭配類神經網路訓練,評估發泡材料的吸能性質。
本研究分為實驗與模擬兩大部分,實驗的部分內容包括靜態拉伸壓縮實驗、衝擊實驗以及高速攝影方法,從實驗結果結合有限元素分析及類神經網路方法進行逆算,取得不同速率衝擊下材料曲線並與實驗驗證。另一方面建立有限元素分析模型,模擬發泡材料受到衝擊過程之狀態並且觀察過程中材料負載及卸載狀況。最後依照模擬結果比對衝擊實驗材料變形的情形來驗證材料曲線參數,由此提供將來在工程應用的模擬方法。

Nowadays, foam materials are widely used in various fields of mankind life like vehicle engineering, construction engineering, packaging materials and so on. The main functions of this type of material is shock absorbing and impact cushioning, so it could be used to protect the structure or human body from injury. This study focus on the material which shoe midsoles are usually made of called Ethylene Vinyl Acetate or EVA. Because of human motions with different speeds, a single height drop test cannot respond the foam specimen loading and unloading in different velocities. Therefore, this study developed a method for estimating cushioning effect of material specimen, and use finite element method with neural network to evaluate foam material energy absorbing property.
This study consists of two major parts. The first part is experiment including quasi-static compression test, tensile test and drop impact tests with high speed camera. In experiment process, using foam molding process makes proper specimens and observing deformation of foam. Applied to the deformation data and neural network method, the process could inversely calculate stress-strain curves in medium strain rate. In the second part, this study applied finite element method with material parameters which are calculated before to simulate drop test process, and verify the result with experiment data. The results from the study could be used in the engineering application to evaluate EVA foam energy absorbing effect.

目錄
中文摘要 I
Abstract III
目 錄 V
表目錄 VII
圖目錄 IX
第一章 緒論 1
1-1 研究動機 1
1-2 研究目的 3
1-3 文獻回顧 4
1-3-1 鞋材應用速率範圍 4
1-3-2 吸震與速率效應理論及其實驗方法 5
1-3-3 有限元素法之材料行為模擬 8
1-3-4 文獻回顧總結 13
1-4 研究方法流程 13
第二章 靜態拉伸與衝擊實驗建立 15
2-1 發泡材拉伸與壓縮實驗 15
2-1-1 實驗儀器 15
2-1-2 實驗方法與結果 17
2-2 衝擊實驗 20
2-2-1 實驗儀器 20
2-2-2 實驗方法 23
2-2-1 實驗結果 26
第三章 發泡材料行為模擬 33
3-1 材料模擬模型 33
3-1-1 應變率相依彈性材料模型 33
3-1-2 Low Density Foam材料參數設定與驗證 34
3-2 衝擊實驗有限元素模型 41
3-2-1 有限元素模型之建立 41
3-2-2 動態衝擊模擬結果 44
第四章 逆算材料曲線之方法 47
4-1 類神經網路簡介 47
4-2 倒傳遞類神經網路 49
4-3 訓練類神經網路 50
4-4 預測不同速率材料曲線方法 52
第五章 逆算材料性質的驗證 57
5-1 材料曲線訓練結果與驗證 57
5-2 不同速率衝擊條件下之比較 63
5-3 材料參數模型應用 66
第六章 結論與建議方向 71
6-1 結論 71
6-2 建議方向 72
參考文獻 73

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