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頁籤選單縮合
題 名 | The Prediction of Fatigue Strength and Life in Composite Laminates=複合材料積層板疲勞強度與壽命之預測 |
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作 者 | 任明華; 李傳華; | 書刊名 | 中國工程學刊 |
卷 期 | 22:3 1999.05[民88.05] |
頁 次 | 頁259-273 |
分類號 | 440.34 |
關鍵詞 | 疲勞強度; 壽命; 複合材料積層板; Fatigue strength; Life; Composite laminates; |
語 文 | 英文(English) |
中文摘要 | 碳纖維/聚醚醚酮(APC-2)複材積層板在靜態與等振幅疲勞負載下的強度及壽命特 徵為本文首要研究主題。此積層板係以改良的隔膜成形法壓製,在製程中可以控制升降溫歷 程及壓力與真空條件,因此可獲得低結晶、具穿晶的優良抗疲勞性質。文中我們先完成了相 關的靜態與疲勞實驗以獲得基本之材料參數,接著擴展的蔡—希爾疲勞破壞標準被提出,可 由[0]□、[90]□及[45]□的疲勞實驗數據來預估多種單向積層板的疲勞強度及壽命,其結 果相當不錯。最後我們再結合古典積層板理論和該標準,對多向積層板進行疲勞強度與壽命 預估,結果發現對於[0/45/90/-45]□及[0/90]□等疊序,預估值與實驗值十分接近;但對於 [±45]□之疊序,因它有大的塑性縮頸及層間磨擦生熱現象耦合發生,故預測結果誤差較大。 本文接著針對碳纖維/聚醚醚酮複材積層板,研究其在承受變化負載下的抗拉—抗拉疲 勞行為。試驗中考量的試片包括有十字疊[0/90]□、類似均向疊[0/45/90/-45]□和角疊[± 45]□,疲勞負載的變化參數則有最大應力值、應力比及負載頻率。在疲勞實驗過程中獲得 了各種疲勞負載下的壽命值,同時也測得剩餘勁度和剩餘強度衰減之情形。此外我們以 Marco-Starkey累積損傷理論為基礎,推導出非線性累增損傷理論和非線性累減未損傷理 論,並且以累積振次比例臨界值建立多區段疲勞負載作用下的破壞準則,用於複合材料承受 多區段疲勞負載下之壽命預估。該等模式預估結果經與試驗數據比較後發現是可接受的。 |
英文摘要 | A theoretical formulation for predicting fatigue strength and life in composite laminates is proposed. First, the Tsai-Hill failure criterion is modified to become the extended Tsai-Hill fatigue failure criterion for the prediction of fatigue characteristics of unidirectional laminates. The fatigue data of [0]□, [90] □, and [45]□ coupons are the base-line data involved in the parametric study to estimate fatigue strengths and lives of other off-axis laminates. The predicted values are found satisfactorily close to the empirical data. In association with classical lamination plate theory (CLPT), the extended Tsai-Hill fatigue failure criterion can also be applied to quasi-isotropic [0/45/-45/90]□ and cross-ply [0/90] □ laminates. Nevertheless the difference is larger for [±45]□ laminates because of the coupling effect of plastic deformation and friction among the layers of relative slippage. Next, based on Marco-Starkey theory we develop the nonlinear cumulative damage as well as the reduced non-damage theory associated with four damage parameters and the failure criterion of multi-block fatigue loading to predict the life due to variable cyclic loadings. The difference in cycle fraction between two damage loading conditions is generated, so that we can easily shift to a different damage curve and predict the life due to a multi-block cyclic loading. Fatigue tests of two-step and multi-block loading are also discussed. The measured lives are in good agreement with those predicted by our proposed four models. |
本系統中英文摘要資訊取自各篇刊載內容。