針對裂隙多孔介質流體注入引起天然裂隙的激活,巖石產生新損傷形成水力裂縫,本案例建立了裂隙多孔介質流固耦合-損傷模型,實現如下功能:(1)采用comsol with matlab建立隨機天然裂隙網絡幾何模型;(2)針對天然裂隙,建立裂隙模型,考慮其變形過程對裂縫寬度和滲透率的影響,可得到裂隙寬度分布;(3)考慮損傷演化過程和流固耦合作用,巖石孔隙度和滲透率隨著損傷和應力大小變化
Alligator Cracks軋制缺陷優化(Homogenization of an Al-Mg alloy and alligatoring failure: Alloy ductility and fracture)3.4 Wavy Edges在軋制過程中,軋板厚度均勻,而由于軋輥發生彈性彎曲變形導致輥縫不均勻,邊緣區域輥縫較薄而中間區域輥縫較厚。
參考文獻:《Numerical implementation of a non-local GTN model for explicit FE simulation of ductile damage and fracture》GTN 一類“耦合型”損傷模型在軟化階段會產生應變/損傷高度局部化,解失去橢圓性,導致結果強依賴單元尺寸(“網格越細,帶寬越窄、耗能趨零”)——這是做延性斷裂數值預測時公認的頑疾
A Two-scale High-order Damaged Elasticity Theory and Solution Procedure for Quasi-brittle Fracture. Computer Methods in Applied Mechanics and Engineering, 445 (2025) 118206.Cao YH, Zhang CY.