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系統識別號 U0026-1207201823443700
論文名稱(中文) 聚醯胺聚合物在高速撞擊下之塑性變形行為與破壞分析
論文名稱(英文) Plastic Deformation and Fracture Behaviour of Polyamide Subjected to High Velocity Impact Loading
校院名稱 成功大學
系所名稱(中) 機械工程學系
系所名稱(英) Department of Mechanical Engineering
學年度 106
學期 2
出版年 107
研究生(中文) 黃嘉泓
研究生(英文) Chia-Hong Huang
學號 N16054700
學位類別 碩士
語文別 中文
論文頁數 97頁
口試委員 指導教授-李偉賢
口試委員-黃永茂
口試委員-施士塵
中文關鍵字 霍普金森桿  Nylon 66  高應變速率 
英文關鍵字 Hopkinson bar  Nylon 66  high strain rate 
學科別分類
中文摘要 本篇論文主要運用霍普金森試驗機在室溫(25℃)下對Nylon 66進行撞擊試驗,並觀測其巨觀機械性質及微觀結構的變化。本次實驗所採用之應變速率分別為2300s-1、3700s-1、5000s-1和6200s-1,並將其細分為高應變速率與低應變速率區間進行討論,再透過所獲得的實驗數據以及微觀結構(OM、SEM)進行分析,藉此了解高應變速率對高分子材料塑變行為及微觀結構之影響。最後利用G'Sell-Jonas 模型為構成方程式來進行模擬,以描述Nylon 66在各應變速率下與塑流應力之關係,方便未來在作為工程模擬分析之用途。
實驗結果指出,應變速率的不同對Nylon 66的機械性質有相當大的影響。在相同應變量下,隨著材料變形的應變速率提升,其塑流應力值、應變速率敏感性係數皆會跟著上升,而熱活化體積、加工硬化率、黏度係數則會隨著應變速率上升而下降。而在相同應變速率下,隨著應變量增加,其熱活化體積會跟著上升,而塑流應力值、應變速率敏感性係數、加工硬化率、黏度係數則會隨著應變量上升而下降。
在微觀結構方面,透過掃描式電子顯微鏡的觀測,Nylon 66在遭受撞擊後會產生凹陷,在凹陷處可以發現許多微裂縫的產生,這些微裂縫便是材料破裂的開端。當試件產生破裂後,可以觀察到破裂邊緣有許多的絲狀物產生,這些絲狀物即是高分子材料在高速撞擊過後產生扭曲的分子結構所形成。
英文摘要 In this study, Nylon 66 was examined under different strain rates by using split-Hopkinson pressure bar to investigate its dynamic deformation behaviors and microstructure characteristics. Impact tests were performed under different strain rates ranging from 2.3×103 s-1 to 6.2×103 s-1 at room temperature.
The results reveal that the mechanical properties are greatly affected by strain rates and the G'Sell-Jonas model can be used to describe the relationship between flow stress and strain. It is found that flow stress and strain rate sensitivity all increase, but the thermal activation volume, work hardening rate and viscosity decreases with the increasing strain rate. However, at a constant strain rate, flow stress, strain rate sensitivity, work hardening rate and viscosity decrease but the thermal activation volume increases with increasing strain. Last but not least, the modified G'Sell-Jonas model is used to describe the deformation behavior of Nylon 66 under the considered strain rate.
Scanning Electron Microscope(SEM) observations show that when Nylon 66 was impacted under high strain rate, the micro-fracture will appear although it can't be observed with the naked eye. Those micro-fracture are the beginning of the fracture, which could cause softening and rapid decrease in the flow stress. SEM fracture morphologies show that there are many threads at the edge of fracture side and the threads' cause of formation is distortion of molecular structure.
論文目次 中文摘要 I
關鍵字:霍普金森桿、Nylon 66、高應變速率 I
absract II
致謝 X
總目錄 XI
表目錄 XV
圖目錄 XVI
符號說明 XIX
第一章 前言 1
第二章 理論與文獻回顧 6
2-1 高分子材料之介紹 6
2-1-1 聚醯胺之介紹 8
2-1-2 尼龍之介紹 8
2-2 塑性變形之機械測試類別 10
2-2-1 靜態或極低之應變速率(10-8<ε ̇<10-5s-1): 10
2-2-2 低速之應變速率(10-5<ε ̇<100 s-1): 11
2-2-3 中速之應變速率(100<ε ̇<102 s-1): 11
2-2-4 高速之應變速率(102<ε ̇<104 s-1): 11
2-2-5 極高速之應變速率(104<ε ̇<107 s-1): 11
2-3 一維波傳理論 12
2-4 霍普金森撞擊試驗機之原理 14
2-5 高分子材料塑性變形行為特性 17
2-5-1 高分子材料之降伏特性與大變形量下之特性 17
2-5-2 Eyring理論 20
2-5-3 基本黏度理論 22
2-6 構成方程式 23
2-6-1 John-son Cook model 24
2-6-2 G'Sell-Jonas model 24
2-6-3 Matsuoka model 25
2-6-4 Brook's model 25
2-6-5 For PVC and HDPE 's constitutive equation 25
2-6-6 For Twaron 's constitutive equation 26
第三章 實驗方法及步驟 37
3-1 實驗流程 37
3-2 實驗儀器與設備 37
3-2-1 霍普金森撞擊試驗機 37
3-2-2 研磨拋光機 39
3-2-3 光學顯微鏡 39
3-2-4 離子真空濺鍍機 40
3-2-5 掃描式電子顯微鏡 40
3-3 實驗步驟 41
3-3-1 實驗試件製備 41
3-3-2 動態衝擊試驗 41
3-3-3 試件外觀之破斷面觀察 42
第四章 實驗結果與討論 45
4-1 應力-應變曲線 45
4-2 應變速率敏感性係數 47
4-3 加工硬化率 48
4-4 熱活化體積 49
4-5 理論溫升量 50
4-6 黏度效應 52
4-7 材料構成方程式 53
4-8 光學顯微鏡與電子顯微鏡之破壞形貌觀察 54
第五章 結論 88
參考文獻 91

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