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砂岩I/II复合型断裂的三点弯曲实验研究
Mixed mode fracture research of sandstone by using three-point bending specimens
投稿时间: 2017-02-24  最后修改时间: 2017-04-04
DOI:
中文关键词:  三点弯曲  数值分析  砂岩  复合型断裂
英文关键词:three-point bending  numerical analysis  sandstone  mixed mode fracture
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
李一凡 四川大学建筑与环境学院力学系 2426496244@qq.com 
董世明 四川大学建筑与环境学院力学系 smdong@scu.edu.cn 
黎坤运 四川大学建筑与环境学院力学系  
华文 黎坤运  
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中文摘要:
      三点弯曲试件常被用来研究材料的纯I型及I/II复合型断裂性能。使用Abaqus通过有限元法获得三点弯曲试件不同跨长比2S/L、相对裂纹长度α和裂纹倾角β下的I型与II型无量纲应力强度因子。可知在相对裂纹长度一定时,跨长比越小,在裂纹倾角越小时I型无量纲应力强度因子可取得0,即越容易得到纯II型断裂;当跨长比相同时,相对裂纹长度越大越容易得到纯II型断裂。使用6组共24个三点弯曲试件,研究砂岩的纯I型、纯II型以及复合型加载时的断裂韧度,得到砂岩的纯I型断裂韧度为0.786MPa穖0.5,纯II型断裂韧度为0.344MPa穖0.5;实验结果与最大周向应力(MTS)准则和广义最大周向应力(GMTS)准则进行对比,可知GMTS准则更能准确的预测实验结果。
英文摘要:
      Three point bending specimens are often used to study pure mode I and I/II mixed mode fracture properties of materials. By using Abaqus through finite element method obtaining mode I and mode II dimensionless stress intensity factors under different span length rate 2s/L ,relative crack length α and crack inclined angle β. It is clear that if the span length ratio is smaller, the crack inclined angle while mode I dimensionless stress intensity factor is 0 smaller, namely easier to get pure type II fracture, when the relative crack length is constant. When the span length ratio is constant, the greater the relative crack length the easier to get pure mode II fracture. Using 6 groups in total 24 three-point bending specimens research pure mode I pure mode II and mixed mode fracture toughness of sandstone. The results show that the values of fracture toughness for pure mode I and pure mode II are 0.786 MPa穖0.5 and 0.344 MPa穖0.5,respectively.The experimental results are also compared with some theoretical results of maximum tangential stress (MTS) criterion and generalized maximum tangential stress (GMTS) criterion, and the GMTS criterion has a better agreement with experimental results.
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