Simultaneous determination of dynamic fracture toughness and tensile strength through a single three-point bending test

IF 2.1 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Mechanics of Time-Dependent Materials Pub Date : 2023-10-02 DOI:10.1007/s11043-023-09639-3

Miao Yu, Haitao Luo, Hongdi Jing, Hongyuan Li, Shuang Wang

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Abstract

The fracture process zone (FPZ) has been assumed to activate microcrack evolution and influence the mechanical parameters of the rock specimen. This can be linked to the grain size of the rock specimens located in the path of the crack propagation. However, few studies have considered the effect of the grain distribution on the size of the FPZ, especially under dynamic loadings. In this paper, we analyze the mechanism by which the strain rate and grain distribution affect the FPZ and the dynamic mechanical parameters. We selected three kinds of sandstone specimens to represent the mesostructure heterogeneities characterized by the fractal dimensions. Also, the size of the FPZ can be calculated by the grain size and the dynamic fictitious crack length under the quantified mesostructure heterogeneities and the concept of the box dimension method. Based on the results, the dynamic strength and fracture toughness can be obtained with unknown coefficients. The unknown coefficients were then determined via the dynamic fracture test, in which the processed semicircle bending (SCB) specimens were used for the pendulum hammer-driven split Hopkinson pressure bar (SHPB) apparatus. Finally, the results were validated using the existing experimental methods recommended by the International Society for Rock Mechanics (ISRM). This study provides a valid and simpler method for the simultaneous determination of the dynamic fracture toughness and tensile strength of rock specimens.

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通过一次三点弯曲试验同时测定动态断裂韧性和拉伸强度

断裂过程区（FPZ）被认为会激活微裂缝的演化并影响岩石试样的力学参数。这可能与位于裂纹扩展路径上的岩石试样的晶粒大小有关。然而，很少有研究考虑晶粒分布对 FPZ 尺寸的影响，尤其是在动态载荷下。本文分析了应变速率和晶粒分布对 FPZ 和动态力学参数的影响机制。我们选择了三种砂岩试样来代表以分形尺寸为特征的中观结构异质性。同时，在量化的介观结构异质性和盒尺寸法概念下，可通过晶粒尺寸和动态假裂缝长度计算 FPZ 的大小。根据计算结果，可以得到带有未知系数的动态强度和断裂韧性。然后，通过动态断裂试验确定未知系数，在该试验中，处理过的半圆弯曲（SCB）试样被用于摆锤驱动的分体式霍普金森压力棒（SHPB）装置。最后，使用国际岩石力学学会（ISRM）推荐的现有实验方法对结果进行了验证。这项研究为同时测定岩石试样的动态断裂韧性和抗拉强度提供了一种有效而简单的方法。

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来源期刊

Mechanics of Time-Dependent Materials 工程技术-材料科学：表征与测试

CiteScore

4.90

自引率

8.00%

发文量

审稿时长

>12 weeks

期刊介绍： Mechanics of Time-Dependent Materials accepts contributions dealing with the time-dependent mechanical properties of solid polymers, metals, ceramics, concrete, wood, or their composites. It is recognized that certain materials can be in the melt state as function of temperature and/or pressure. Contributions concerned with fundamental issues relating to processing and melt-to-solid transition behaviour are welcome, as are contributions addressing time-dependent failure and fracture phenomena. Manuscripts addressing environmental issues will be considered if they relate to time-dependent mechanical properties. The journal promotes the transfer of knowledge between various disciplines that deal with the properties of time-dependent solid materials but approach these from different angles. Among these disciplines are: Mechanical Engineering, Aerospace Engineering, Chemical Engineering, Rheology, Materials Science, Polymer Physics, Design, and others.