脆性材料Ⅰ型(张开)-断裂韧性测定的PFC2D和试验研究:一种新方法
Determination of mode Ⅰ fracture toughness of brittle materials with a new method
付金伟 1Hadi Haeri 2Joseph F.Labuz 3Vahab Sarfarazi 4Pouyan Ebneabbasi 5MRM Aliha 6Hamid Reza Karimi 7Shirin Jahanmiri 4Mohammad Fatehi Marji8
作者信息
- 1. School of Civil Engineering and Transportation,North China University of Water Resources and Electric Power,Zhengzhou 450046,China
- 2. Department of Mining Engineering,Higher Education Complex of Zarand,Shahid Bahonar University of Kerman,Kerman,Iran
- 3. Department of Civil Environmental,and Geo-Engineering,University of Minnesota,Minneapolis 55455,USA
- 4. Department of Mining Engineering,Hamedan University of Technology Hamedan,Iran
- 5. Research Scholar,Civil Engineering Department,Islamic Azad University,Hamedan,Iran;Welding and Joining Research Center,School of Industrial Engineering,Iran University of Science and Technology Narmak,Tehran,Iran
- 6. Welding and Joining Research Center,School of Industrial Engineering,Iran University of Science and Technology Narmak,Tehran,Iran
- 7. Welding and Joining Research Center,School of Industrial Engineering,Iran University of Science and Technology Narmak,Tehran,Iran;School of Civil Engineering,Iran University of Science and Technology(IUST),Narmak,Tehran,Iran
- 8. Department of Mine Exploitation Engineering,Faculty of Mining and Metallurgy,Institute of Engineering,Yazd University,Yazd,Iran
- 折叠
摘要
在本文研究中,通过利用优势边缘缺口盘型(END)试样,确定了石灰石的断裂韧性,提出了一种新的石灰石归一化相应力、高相变的计算方法.采用柔性有限元法(FEM)对试样的Ⅰ型(张开)-断裂韧性进行了精确计算,并得到了相应实用公式.在试验中,还使用含缺口巴西圆盘(NBD)试件,测试了END程序的准确性.为了在数值上重现这些测试并验证断裂韧性测量的正确性,还对END测试进行了离散元分析.数值模拟结果与实验结果吻合良好.然而,END研究所确定的韧性水平低于NBD测试规定的韧性水平,这是因为END石灰石样品中的缺口具有均匀的拉伸应力分布.
Abstract
In this work,the fracture toughness of limestone was determined utilizing advantage edge-notched disc(END)type specimens.The normalized Phase Ⅰ stress high transformational of limestone was calculated using a novel method.The samples'Mode Ⅰ(opening)-fracture toughness was accurately calculated using the flexible finite element method(FEM)to develop this helpful formula.The notched Brazilian discs(NBD)were used in a lab experiment to test the accuracy of the END procedure.To recreate these tests numerically and verify the correctness of the fracture toughness measurements,a discrete element analysis of the END tests was also performed.The findings of the numerical simulations and the fracture extension patterns derived from the experimental testing showed excellent agreement.The toughness levels determined by END studies,however,were less than those specified by NBD testing.This is because the notch in the END limestone sample has a uniform tensile stress distribution.
关键词
FEM/Mode Ⅰ(opening)-fracture toughness/Edge-notched disc/LimestoneKey words
FEM/Mode Ⅰ(opening)-fracture toughness/Edge-notched disc/Limestone引用本文复制引用
基金项目
国家自然科学基金(51608117)
High Foreign Country Expert Project in Henan Province(HNGD2022040)
出版年
2024
NETL
NSTL
万方数据