界面控制下间距对双丝拉拔实验影响的数值模拟研究

发布时间：2018-01-29 03:15

本文关键词： 双丝拉拔间距界面剪应力　出处：《武汉理工大学学报》2015年09期 　论文类型：期刊论文

【摘要】：从细观非均匀性角度建立了含骨料的混凝土双丝拉拔数值模拟模型,研究了双丝间距变化对双丝拉拔构件的力学性能影响,观察了双丝构件拉拔过程中构件裂纹萌生、扩展直至失稳破坏全过程,获得了不同双丝间距构件的剪应力分布数值光弹图、荷载-位移曲线、声发射计数曲线及沿界面剪应力分布曲线等。研究表明:构件的峰值荷载随双丝间距增加而增加;构件韧性随双丝间距增大而减少;同时间距变化对沿界面剪应力分布影响较大。
[Abstract]:The numerical simulation model of double-wire drawing of concrete with aggregate was established from the point of view of meso inhomogeneity. The influence of the change of double wire spacing on the mechanical properties of double-wire drawing member was studied. The whole process of crack initiation, propagation and instability failure of double-wire members during drawing is observed. The numerical photoelastic diagram and load-displacement curve of the shear stress distribution of members with different double wire spacing are obtained. The acoustic emission counting curve and the shear stress distribution curve along the interface show that the peak load of the member increases with the increase of the distance between the two wires. The toughness decreases with the increase of the distance between two wires. At the same time, the variation of spacing has a great influence on the distribution of shear stress along the interface.
【作者单位】：广州大学土木工程学院;合乐中国有限公司;
【基金】：国家自然科学基金(51278136) 广州市教育局羊城学者资助项目(12A007G) 广州市科技创新平台项目(15180005)
【分类号】：TU528
【正文快照】： 钢纤维增强混凝土及钢筋混凝土是土木工程领域中应用广泛的复合材料。钢纤维与混凝土之间及钢筋与混凝土之间有着相同的粘结机理[1]。混凝土水化过程中,钢纤维及钢筋表面与混凝土发生一系列复杂的化学物理反应,并形成与混凝土及钢纤维或钢筋力学性能完全不同的新相,即所谓的界

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