Experiment and finite element analysis of rock dynamic fracture toughness test on nonideal crack disc specimens

CUI Zhi-li; GONG Neng-ping; JING Lai-wang

doi:10.16285/j.rsm.2015.03.013

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Experiment and finite element analysis of rock dynamic fracture toughness test on nonideal crack disc specimens

更新时间：2026-06-25

- Experiment and finite element analysis of rock dynamic fracture toughness test on nonideal crack disc specimens
- Vol. 36, Issue 3, Pages: 694-702(2015)
- 作者机构：
  
  安徽理工大学理学院,安徽,淮南,232001
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2015.03.013
  CLC： TU45
- Online First：13 June 2018，
  
  Published：2015
- 稿件说明：
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CUI Zhi-li, GONG Neng-ping, JING Lai-wang. Experiment and finite element analysis of rock dynamic fracture toughness test on nonideal crack disc specimens[J]. 2015, 36(3): 694-702.
DOI：

CUI Zhi-li, GONG Neng-ping, JING Lai-wang. Experiment and finite element analysis of rock dynamic fracture toughness test on nonideal crack disc specimens[J]. 2015, 36(3): 694-702. DOI： 10.16285/j.rsm.2015.03.013.

摘要

采用中心裂纹圆盘-霍普金森压杆(CCCD-SHPB)试验系统对大理岩中心裂纹圆盘试件进行不同加载速率下的纯Ⅰ型加载试验，研究岩石材料动态断裂韧性的加载速率相关性。考虑到试验中所使用的圆盘试件是带有中心切口的非理想裂纹，结合试件的实际加工情况，提出采用切口尖端形状为小圆弧形的预制裂纹，介绍了试件的制作方法，并利用有限元计算论证了采用这种形状非理想裂纹试件的试验可行性。结果表明，采用圆弧形裂尖、裂纹宽度为1 mm的中心切口非理想裂纹圆盘试件来代替理想裂纹圆盘试件是可行的，误差不超过2.13%。分析试验数据得出：非理想裂纹圆盘试件在纯Ⅰ型加载条件下，其断裂韧度表现出明显的速率相关性，且随着加载速率的增大而增大。

Abstract

With central cracked circular disk-split Hopkinson pressure bar (CCCD-SHPB) test system

the pure type I loading tests on the marble center cracked specimens are taken under different loading rates. Relationship between loading rate and dynamic rock fracture toughness of materials is determined. The disc specimen in test has a nonideal crack with center incision. Combining with the actual processing of specimens

the paper presents the prefabricated crack with the notch tip shape of small arc and introduces the machining method for specimens. The feasibility of the nonideal crack test specimen is demonstrated with finite element analysis. The results show that it is feasible to use the nonideal crack disc specimens with circular arc crack tip and the crack width of 1 mm to replace the ideal crack disc specimens; the error does not exceed 2.13%. Under the condition of pure type I loading

the fracture toughness of nonideal crack specimen shows obvious correlation with loading rate

and it increases with the loading rate increasing.

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