考虑岩石断裂过程区 (FPZ) 的裂缝尖端张开位移 (CTOD) 修正计算模型

IF 3.9 2区 工程技术 Q3 ENERGY & FUELS Geomechanics and Geophysics for Geo-Energy and Geo-Resources Pub Date : 2024-03-20 DOI:10.1007/s40948-024-00779-5
Yang Qiao, Zong-Xian Zhang, Jun Zhou
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引用次数: 0

摘要

考虑到 FPZ 和有效杨氏模量,本研究探讨了一种新的 CTOD 计算方法。将四个理论模型计算出的 CTOD 值与三点梁实验测得的 CTOD 值进行了比较,并分析了两者之间的差异。测得的 CTOD 由两部分组成:(1) 裂纹尖端区域的弹塑性变形产生的位移;(2) FPZ 中的微损伤产生的位移。FPZ 微损伤引起的 CTOD 值占整个 CTOD 的 81-92%。因此,引入 FPZ 和有效杨氏模量来修改 CTOD 的计算模型。结果表明,修正的塑性区模型在计算 CTOD 方面优于条形屈服模型、塑性区模型和修正的条形屈服模型,CTOD 误差从塑性区模型与实验之间的 81% 至 90% 降低到修正的塑性区模型与实验之间的 4% 至 34%,近一半试样的误差小于 10%。
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A modified model for calculating crack tip opening displacement (CTOD) considering fracture process zone (FPZ) in rock

A new CTOD calculation method is investigated in this study, considering the FPZ and the effective Young’s modulus. The calculated CTOD values from four theoretical models are compared with the measured CTOD values from the three-point beam experiments, and the differences between them are analyzed. The measured CTOD consists of two parts: (1) the displacement generated by the elastic–plastic deformation in the crack tip region, and (2) the displacement generated by micro-damage in the FPZ. CTOD value caused by micro-damage in the FPZ accounts for 81–92% of the overall CTOD. Thus, the FPZ and the effective Young’s modulus are introduced to modify the models for calculating CTOD. The result indicates that the modified plastic zone model is better than the strip-yield model, the plastic zone model and the modified strip-yield model in calculating CTOD, and CTOD error is reduced from 81 to 90% between the plastic zone model and the experiment to 4–34% between the modified plastic zone model and the experiment, with nearly half of the specimens having an error of less than 10%.

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来源期刊
Geomechanics and Geophysics for Geo-Energy and Geo-Resources
Geomechanics and Geophysics for Geo-Energy and Geo-Resources Earth and Planetary Sciences-Geophysics
CiteScore
6.40
自引率
16.00%
发文量
163
期刊介绍: This journal offers original research, new developments, and case studies in geomechanics and geophysics, focused on energy and resources in Earth’s subsurface. Covers theory, experimental results, numerical methods, modeling, engineering, technology and more.
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