混凝土动态断裂数值模拟研究
, PP. 741-745
Keywords: 工程力学,混凝土,应变率,应变率效应
Abstract:
？动态拉伸载荷下，混凝土断裂强度随应变率的增加而提高。根据混凝土内部骨料与砂浆动态拉伸载荷下，混凝土断裂强度随应变率的增加而提高。根据混凝土内部骨料与砂浆的力学性能，建立描述混凝土材料的细观有限元模型。通过ABAQUS二次开发单元UEL计算动载荷下垂直骨料砂浆界面裂纹的扩展，计算不同加载率下裂纹的扩展路径。计算结果表明，在低加载率下，裂纹沿着骨料与砂浆界面传播，在高加载率下，裂纹将穿过骨料，分析表明混凝土应变率效应的物理成因应为骨料断裂所致。
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