FRACTURE CRITERION OF THE THEORY OF CRITICAL DISTANCE FOR NOTCHES

LIU XiaoMei; BIAN YongMing; LIANG YongCheng; LI AnHu

doi:10.16579/j.issn.1001.9669.2018.03.011

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FRACTURE CRITERION OF THE THEORY OF CRITICAL DISTANCE FOR NOTCHES

更新时间：2022-09-22

- FRACTURE CRITERION OF THE THEORY OF CRITICAL DISTANCE FOR NOTCHES
- Journal of Mechanical Strength Vol. 40, Issue 3, Pages: 570-575(2018)
- 作者机构：
  
  1. 上海工程技术大学机械工程学院
  2. 同济大学机械与能源工程学院
  3. 上海海洋大学工程学院
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2018.03.011
  CLC：
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LIU XiaoMei, BIAN YongMing, LIANG YongCheng, et al. FRACTURE CRITERION OF THE THEORY OF CRITICAL DISTANCE FOR NOTCHES. [J]. 40(3):570-575(2018)
DOI：

LIU XiaoMei, BIAN YongMing, LIANG YongCheng, et al. FRACTURE CRITERION OF THE THEORY OF CRITICAL DISTANCE FOR NOTCHES. [J]. 40(3):570-575(2018) DOI： 10.16579/j.issn.1001.9669.2018.03.011.

摘要

借助于有限元分析,探索临界距离原理应用于各种切口石墨平板脆断的有效性,其中包括U型切口平板的拉伸试样、钝V型切口半圆形弯曲试样、单边钝V型切口三点弯曲梁试样和钝V型切口的巴西圆盘压缩试样等。首先利用临界距离原理,标定材料的特征距离和内部强度应力,计算出两种石墨材料的断裂韧度,并与文献中的给定值进行了比较。然后预测了I型模式下各切口件的断裂载荷,并与实验结果进行了比较。结果表明:临界距离原理不仅可以预测切口件的断裂,还提供了一种根据切口件的断裂实验来预测材料断裂韧度的工程方法。而且,临界距离原理的最大优点是只需要切口附近的数值结果,从而避免求解切口附近复杂的解析应力场,因而适合工程应用。

Abstract

Whether the brittle fracture criterion of theory of critical distance is suitable for graphite plates with different shape notches was studied by means of analysis of finite element: including tensile specimens with U notches,blunted V-notch specimens of semi-circular bend,three-point bending specimens with single V-notch and compressed specimens of Brazilian disk.According to the theory of critical distance,the parameters of fracture toughness for two graphite materials were calculated by the calibrated characteristic distance and inherent strength and compared with the given values in the literature. The values of fracture loading for all notches under mode I were predicted and also compared with the experimental values. The theory of critical distance can not only predict the fracture loading and but also provide an engineering method to evaluate the fracture toughness by the fracture experiment of notched components. The theory of critical distance suitable for engineering just makes use of the numerical results,avoiding the complex analytical solutions of stress fields near the tip of notches,which is the best advantage.

关键词

临界距离原理断裂韧度石墨切口

Keywords

The theory of critical distanceFracture toughnessGraphiteNotches

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