混合模式断裂的热机械相场模型及其在类岩材料中的应用

IF 7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL International Journal of Rock Mechanics and Mining Sciences Pub Date : 2024-09-27 DOI:10.1016/j.ijrmms.2024.105907
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引用次数: 0

摘要

热诱导断裂是混凝土和类岩材料的一种常见现象,这给数值建模带来了巨大挑战。本研究提出了一种基于相场法的混合模式断裂热机械模型。这种方法克服了复杂断裂模式下热致开裂过程建模的困难。为了模拟热机械条件下的不同破坏模式,模型的构成表达式包括一个统一的破坏准则,该准则同时考虑了拉伸强度和剪切强度。所提出的公式为岩石等脆性材料提供了对长度尺度不敏感的响应,尽管也可以涉及其他纯机械断裂的流行相场理论。岩石类材料代表性实例的计算结果与之前的研究结果高度一致。研究表明,所提出的模型可以有效地再现各种裂纹模式(如拉伸、剪切和拉伸剪切断裂)的热诱导裂纹过程,这表明该方法具有卓越的能力,值得进一步研究。
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A thermo-mechanical phase-field model for mixed-mode fracture and its application in rock-like materials
Thermally induced fracture is a common phenomenon for concrete and rock-like materials, which presents a significant challenge to numerical modelling. In this work, a thermo-mechanical model for mixed-mode fracture based on phase-field method is proposed. This approach overcomes the difficulties of modelling the thermally induced cracking process when it comes to complex fracture patterns. To simulate different failure modes in thermo-mechanical conditions, the model's constitutive expression includes a unified failure criterion that takes into account both tensile and shear strengths. The proposed formulation provides a length scale insensitive response for brittle materials such as rocks, although other prevalent phase-field theories for purely mechanical fracture can also be involved. The computational results of the representative examples for rock-like materials are highly consistent with prior findings. It demonstrates that the presented model can effectively reproduce the thermally induced cracking process for various cracking patterns, such as tensile, shear, and tensile-shear fractures, indicating the method's remarkable capabilities for further research.
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来源期刊
CiteScore
14.00
自引率
5.60%
发文量
196
审稿时长
18 weeks
期刊介绍: The International Journal of Rock Mechanics and Mining Sciences focuses on original research, new developments, site measurements, and case studies within the fields of rock mechanics and rock engineering. Serving as an international platform, it showcases high-quality papers addressing rock mechanics and the application of its principles and techniques in mining and civil engineering projects situated on or within rock masses. These projects encompass a wide range, including slopes, open-pit mines, quarries, shafts, tunnels, caverns, underground mines, metro systems, dams, hydro-electric stations, geothermal energy, petroleum engineering, and radioactive waste disposal. The journal welcomes submissions on various topics, with particular interest in theoretical advancements, analytical and numerical methods, rock testing, site investigation, and case studies.
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