多孔黏彈性材料的主要組成為多孔洞的固體網絡與充滿於孔洞之間的孔隙流體，能同時表現出固體黏彈性和液體流動性行為。廣泛的應用使了解其內部結構和力學性質，尤其破壞性質於設計上極為重要。
本文將分析多孔黏彈性體中長度為2a的裂縫，因裂縫面及遠端邊界滲透條件不同驅使液體流出固體網絡，使得多孔黏彈性體的固體網絡發生變形。搭配遠端邊界不同的束制條件，探討三種型態的破壞問題。
使用ABAQUS模擬多孔黏彈性體中的裂縫，在裂縫尖端附近放置凝聚力元素(cohesive element)，採用J積分原理計算瞬時能量釋放率。時間極短時，瞬時能量釋放率數值結果符合其理論預測值，其值受多孔黏彈體的固體網絡材料性質與液體流動範圍以及遠端邊界束制條件影響。當遠端邊界應力為零，瞬時能量釋放率最大值發生於排水完成前，排水完成時其瞬時能量釋放率趨近於零。當遠端邊界應變為零，邊界上會產生一拉應力，由此拉應力計算應力強度因子及瞬時能量釋放率之最終值。若液體排水時間與固體黏彈性網絡鬆弛時間有明顯差異，則瞬時能量釋放率會分兩階段達到最終值。
由本研究數值結果得知裂縫尖端應力與變形行為隨液體流動與固體鬆弛作用相互影響，因此瞬時能量釋放率與遠端邊界及裂縫面滲透條件息息相關。經由數值模擬不同邊界滲透與束制條件及固體黏彈性材料性質變化下的裂縫尖端瞬時能量釋放率，可供判斷多種情境下多孔黏彈體裂縫增長的趨勢。

In this study, a center crack of finite length 2a in a saturated poroviscoelastic plane of dimensions 2W is analyzed. Permeability conditions on the crack faces or the remote boundaries will drive the liquid out of the solid network, which will deform the solid network of poroviscoelastic medium. Three mixed types of permeability conditions on the crack faces and the remote boundaries are considered. A finite element software ABAQUS is used to simulate the crack in a poroviscoelastic medium. The instantaneous energy release rate is calculated by J-integral, which uses the cohesive zone embedded ahead of the crack tip. At small flow times, the numerical results of the instantaneous energy release rate correspond to the theoretical prediction. The value of J is affected by the material properties of the solid network, the value of W/a and the constraint on the remote boundaries. From the numerical results of this study, it is known that the stress near the crack tip and the deformation of solid network is influenced by both liquid flow and viscoelastic relaxation of solid.

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