臺灣博碩士論文加值系統

本文針對四種疊層方式的積層板，[0/45/90/-45]2s、[0/60/-60]2s、[90/-30/30]2s及[0/90]2s，分別對原始試片及受熱循環後之試片進行軸性拉伸疲勞實驗以了解熱循環對材料疲勞破壞之影響；同時並針對[0/45/90/-45]2s疊層方式進行負載順序效應及熱循環的交互影響研究。
實驗結果指出，不同的疊層方式表現出不同的疲勞性質以及破壞模式。一般來說，熱循環主要造成基材的劣化，疲勞壽命在低應力等級會有下降情形，但實驗結果顯示在試片極易發生脫層時，熱循環的效果並不明顯。同時，Miner’s rule將被運用於比較實驗結果，然而負載順序效應在高、低應力明顯的不同。經高應力預疲勞，其殘餘強度些許下降。疲勞性質方面，高應力等級疲勞壽命明顯降低，但低應力等級疲勞壽命幾乎與原始試片相同。而經低應力預疲勞，殘餘強度下降幅度大於高應力等級預疲勞，疲勞性質由於已完全脫層，故無論在高、低應力均明顯下降，且由於損傷累積接近線性增加，實驗結果十分接近Miner’s rule所預測結果。

第一章 前言
第二章 文獻回顧
2-1 高分子複合材料的疲勞特性
2-1.1 高分子複合材料的破壞型態
2-1.2 應力(S)與破壞週次( Nf )的關係
2-1.3 殘餘強度、勁度與模數( Modulus )的變化
2-2 高分子複合材料承受熱循環負載之特性
2-3 負載順序效應對高分子複合材料的影響
2-4 疊層順序對高分子複合材料的影響
第三章 實驗內容與程序
3-1 儀器簡介
3-1.1 Instron-1322型軸向-扭向液壓伺服動態試驗系統
3-1.2 實驗控制系統及資料記錄軟體
3-1.3 熱壓機
3-1.4 熱循環機
3-1.5 C-Scan超音波系統
3-2 試片製作及檢測
3-3 實驗程序
3-3.1 原始試片靜態軸向拉伸強度及疲勞試驗
3-3.2 熱循環破壞
3-3.2.1 殘餘強度試驗
3-3.2.2 軸向拉伸疲勞試驗
3-3.3 預疲勞週次破壞
3-3.4 預疲勞週次破壞與熱循環雙重破壞
3-3.5 疊層順序影響
第四章 結果與討論
4-1 原始試片
4-1.1 軸向擬靜態拉伸實驗
4-1.2 拉伸-拉伸疲勞試驗
4-2 經熱循環之試片
4-2.1 殘留強度
4-2.2 拉伸-拉伸疲勞試驗
4-3 負載順序效應
4-3.1 經高應力等級預疲勞
4-3.2 經低應力等級預疲勞
4-4 負載順序與熱循環破壞加成效應
4-4.1 經高應力等級預疲勞再經熱循環破壞
4-4.2 經低應力等級預疲勞再經熱循環破壞
4-5 熱循環效應的影響
4-6 疊層順序效應
4-6.1 靜態強度與疲勞性質
4-6.2 破壞模式
第五章 結論與建議
第六章 參考文獻

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