脫層是複材疊層板常見的缺陷，此種缺陷主要是由於製作時之接合不良、低速碰撞、疲勞或在承受負載時於自由端邊緣產生過大的層間應力等因素所造成，而使得複材疊層板強度降低，甚至於承受負載時因脫層成長等因素而產生不可預期的破壞。
本文從理論和實驗兩方面著手探討含脫層複材疊層樑於承受純彎矩和橫向負載等不同形式負載時之脫層間接觸現象、局部挫曲行為和脫層成長現象。在理論分析方面，假設複材疊層板為平面應變狀態之樑，以更新拉格朗日法推導包含接觸限制條件的二維非線性有限單元之增量型系統方程式，脫層間的接觸問題則以轉換矩陣法來建立脫層上下方疊層間之接觸限制條件，並將此限制條件引入系統方程式中，在數值解題步驟中採用修正型牛頓－拉夫森迭代法配合負載控制法求解，並探討脫層長度、脫層深度、疊層角度及脫層上下方疊層表面間之摩擦係數等各種參數對彎曲強度之影響，以及脫層長度和脫層深度對能量釋放率的影響，使用之單元除平面等參單元外，另以非調和型等參單元，來避免因單元分割時細長比過大而影響計算結果；在實驗方面使用拉壓試驗機配合四點彎矩及懸臂型式之夾具，進行純彎矩及橫向施載實驗，以測試含脫層之複材疊層板承受純彎矩及橫向負載時之強度變化，並於施載實驗中觀察局部挫曲及脫層成長現象；實驗前後另以超音波檢測系統檢測疊層板之脫層成長。

由結果可知有限單元分析所得結果與實驗結果一致。分析此一類型問題時，需於脫層上下方疊層間加入接觸之限制條件，以避免分析結果產生誤差。脫層之存在可降低疊層板之彎曲強度，其中又以脫層在厚度方向上的位置影響較大，較長及較淺脫層之複材樑會產生局部挫曲，並影響其能量釋放率之計算與脫層之成長；對於承受橫向負載之含脫層複材懸臂樑而言，局部挫曲也影響脫層成長之方向。

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