PBT/GF複合材料挫屈及後挫屈之研究

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趙倉賜(Tsang-Tzu Chao) 查詢紙本館藏

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機械工程學系

論文名稱

PBT/GF複合材料挫屈及後挫屈之研究

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摘要(中)

本研究結合模流分析與有限元素分析探討短玻璃纖維(15 wt%)強化聚丁烯對苯二甲酸酯(PBT)複合材料之射出成型條件對於殘留應力、翹曲、挫屈以及後挫屈的影響。研究方法主要以傳統實驗方法擬定成形條件，分別探討不同射出成型條件如充填時間、融膠溫度、模具溫度等參數，對於試片的殘留應力、翹曲、挫屈、後挫屈以及試片的長寬比與厚度改變對於殘留應力、翹曲及後挫屈的影響。

由研究結果顯示，射出成型條件中充填時間與融膠溫度對於試片之殘留應力、翹曲、挫屈以及後挫屈影響甚鉅。對於在不同射出成型條件下，試片最小殘留應力為充填時間9秒、融膠溫度275℃與模具溫度80℃，最小翹曲量的成型條件為充填時間9秒、融膠溫度230℃與模具溫度80℃，而最大挫屈力則為充填時間9秒、融膠溫度230℃與模具溫度80℃。而試片長寬比改變對於殘留應力、翹曲以及後挫曲之影響的結果中，試片的殘留應力隨著長寬比增加而下降;平均翹曲量隨著長寬比增加而上升;而後挫曲隨著長寬比增加，承受負荷的能力逐下降。而試片的厚度改變對於殘留應力、翹曲以及後挫曲之影響的結果中，試片的殘留應力隨著厚度增加，殘留應力略增;平均翹曲量隨著厚度增加而略減;而後挫曲隨著厚度增加，承受負荷的能力逐漸上升。

關鍵字(中)

★ 射出成型
★ 殘留應力
★ 翹曲
★ 挫屈
★ 後挫屈

關鍵字(英)

論文目次

總目錄

摘要 I

誌謝 II

符號說明 III

總目錄 IV

圖目錄 VI

表目錄 VIII

第一章緒論 1

1-1 研究背景 1

1-2 研究目的 2

1-3 研究內容 3

1-4 研究方法 3

1-5 論文架構 3

第二章文獻回顧 4

2-1 熱塑性塑膠 PBT/GF 4

2-2 成型條件選定與射出成型模擬研究 4

2-4 複合材料之挫屈與後挫屈的研究 5

第三章射出成型加工法與挫屈分析理論 6

3-1 充填及保壓過程之理論 6

3-2 射出成型冷卻過程 8

3-3 射出成型過程之殘留應力 9

3-4 成形條件擬定 10

3-5 挫屈力理論說明 10

3-5-1 線性挫屈分析 11

3-5-2 非線性挫屈分析 11

第四章模流分析、挫屈及後挫屈分析方法 14

4-1 實驗材料 14

4-2 試片規格 14

4-3 模流分析 14

4-4 殘留應力與翹曲量分析 15

4-5 資料轉換 15

4-6 線性與非線性挫屈分析 16

第五章結果與討論 17

5-1 殘留應力驗證 17

5-2 挫屈與後挫屈驗證 18

5-3 成形條件對於殘留應力的影響 19

5-4 成形條件對於翹曲量的影響 19

5-5 成型條件對於挫屈力的影響 21

5-6 成形條件對於後挫屈的影響 21

5-7 最佳條件對於殘留應力、翹曲及挫屈力的影響 22

5-8 幾何形狀對於殘留應力、翹曲量及後挫屈的影響 22

5-8-1 幾何形狀對於殘留應力的影響 22

5-8-2 幾何形狀對翹曲的影響 23

5-8-3 幾何形狀對後挫屈的影響 23

第六章結論與未來發展 24

6-1 結論 24

6-2 未來發展 24

參考文獻 25

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指導教授

黃俊仁(Jiun-ren Hwang)

審核日期

2003-7-7

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