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混凝土非标准楔入劈拉试件断裂参数的确定 被引量:6

Determination for Fracture Parameters of Non-standard Wedge Splitting Specimen of Concrete
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摘要 目前混凝土非标准楔入劈拉试件还没有一个合适的确定裂缝尖端断裂参数公式,通常的方法是借用紧凑拉伸试件的应力强度因子公式,不便于应用。文中利用有限元程序,对在不同高度以及不同初始缝高比条件下非标准楔入劈拉试件进行了模拟。得到了裂缝尖端的应力强度因子公式以及裂缝张口位移曲线。分析结果及举例表明,非标准楔入劈拉实验断裂参数确定模型是可靠的。断裂韧度不随试件尺寸变化,是材料常数;裂缝扩展量不受初始裂缝长度影响,而随着试件高度的增加而增长。 Through test simulations on the non-standard wedge splitting specimens of concrete by using the finite element program, the expressions for stress intensity factors are proposed here at the tip of crack, as well as the mouth opening displacement curves of crack. The results show that the fracture parameters from the non-standard wedge splitting tests are reliable for the model, the fracture toughness do not vary with the size of specimens, and the crack extension is little sensitive to the initial crack length, but it increases along with the depth of specimens.
出处 《水利与建筑工程学报》 2010年第1期1-4,18,共5页 Journal of Water Resources and Architectural Engineering
基金 国家自然科学基金资助项目(50708014)
关键词 混凝土 非标准 楔入劈拉试件 断裂参数 concrete non-standard wedge splitting specimen fracture parameter
作者简介 赵艳华(1974-),女(汉族),山西大同人,工学博士,副教授,博士生导师,主要从事混凝土断裂力学方面的研究。
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参考文献9

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二级参考文献9

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