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利用有限断裂力学方法对含尖锐V型切口素混凝土试件的三点弯曲试验研究
The research of three point bending test of concrete specimens with sharp-V notch by finite fracture mechanics
投稿时间: 2016-10-19  最后修改时间: 2017-01-13
DOI:
中文关键词:  脆性指数,V型切口,破坏荷载,有限断裂力学,混凝土
英文关键词:brittleness number, V-notch, failure load, finite fracture mechanics,concrete
基金项目:基于有限断裂力学的准脆性材料断裂与疲劳特性研究
作者单位E-mail
童谷生 华东交通大学 tonggusheng@126.com 
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中文摘要:
      摘要:为研究含V型切口素混凝土梁在三点弯曲情况下的断裂特性,本文引入了一种耦合应力与能量的有限断裂力学分析方法,分析推导影响随V型切口开口角度变化的有限距离及广义断裂韧度的广义应力强度因子解析表达式。广义断裂韧度及有限距采用断裂韧度及抗拉强度及开口角度的函数来表示。通过三种缝高比包含几种开口角度素混凝土的三点弯曲试验的结果表明,与平均应力准则相比有限断裂力学方法预测破坏荷载有更高精度,同时理论值与结果吻合程度也更好。
英文摘要:
      Abstract: In order to study V-notch fracture properties of plain concrete beams under three point bend conditions, this paper introduces the finite fracture mechanics coupled stress and energy analysis. Generalized stress intensity factor analytic expression is derived impact analysis with V-notch opening angle variation of a finite distance and generalized fracture toughness. The fracture toughness and finite distance expressed by fracture toughness and tensile strength and function of the opening angle. The results of the three-point bending test three crack height ratio contain several opening angle of plain concrete show that the finite fracture mechanics to predict loads more precision, while the degree of agreement with the results of the theoretical value better.
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