Study on fatigue mechanical properties and constitutive model of heat-treated sandstone

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-02-21 DOI:10.1016/j.tafmec.2025.104898

Mengxiang Wang , Jiangteng Li , Zhanming Shi , Zhidan Zheng , Hang Lin , Kaihui Li , Dongya Han

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引用次数: 0

Abstract

High temperature and fatigue are critical factors in underground rock engineering. This study investigates the fatigue characteristics of heat-treated sandstone specimens through multi-stage fatigue loading tests. The fatigue behavior is analyzed in terms of stress–strain curves, deformation, energy, acoustic emission, and crack propagation. A damage evolution equation is derived based on the extended Lemaitre strain equivalence principle, incorporating the effects of high temperature, fatigue, and creep. The modified Nishihara model, integrating creep and damage mechanics, forms a new damaged component combination model. Results show that 400 °C is a critical temperature for sandstone, with axial strain and energy density increasing stepwise with fatigue cycles. The percentage of shear cracks rises with temperature, though failure remains a mixed tensile-shear mode. The coupled damage evolution equation accurately describes damage development at different temperatures. The new model effectively captures the specimen deformation during multi-stage fatigue loading. These findings enhance the understanding of rock fatigue behavior and contribute to the prevention of underground engineering disasters.

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.