Effect of cyclic heating-rapid cooling on fracture behavior of notched semi-circular bend granite

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL Theoretical and Applied Fracture Mechanics Pub Date : 2025-02-17 DOI:10.1016/j.tafmec.2025.104889

Yunlong Wang , Peng Hou , Shanjie Su , Xin Liang , Yanan Gao , Feng Gao

{"title":"Effect of cyclic heating-rapid cooling on fracture behavior of notched semi-circular bend granite","authors":"Yunlong Wang , Peng Hou , Shanjie Su , Xin Liang , Yanan Gao , Feng Gao","doi":"10.1016/j.tafmec.2025.104889","DOIUrl":null,"url":null,"abstract":"<div><div>Cyclic liquid nitrogen (LN<sub>2</sub>) fracturing is a promising innovative technology expected to rapidly form fracture networks in geothermal reservoirs. The fracture characteristics are crucial for estimating the effect of the artificial fracturing. Therefore, a cyclic heating-rapid cooling (CHRC) experiment is conducted on the notched semi-circular bend (NSCB) granite, where LN<sub>2</sub> and water cooling are employed. The structural damage and fracture characteristics of the CHRC treated sample are analyzed using ultrasonic detection, three-point bending test, and acoustic emission (AE) technique. A grain-based model with thermo‑mechanical coupling is constructed to explore the micro-cracking mechanism of the CHRC treatment. The results indicate that the damage caused by the CHRC increases significantly in the first five cycles, especially under LN<sub>2</sub> cooling. The decline of fracture toughness with cycles under different cooling methods. LN<sub>2</sub> cooling can dramatically enhance the AE energy release and fracture surface roughness in the initial cycles. LN<sub>2</sub> cooling can promote the generation of tensile cracks and intra-granular microcracks. The fracture behaviors of the CHRC treated granite are mainly determined by the stable thermal stress, significantly affected by mineral distribution. These results can provide a comprehensive understanding of cyclic LN<sub>2</sub> fracturing compared to hydraulic fracturing, supporting theoretical guidance for geothermal extraction.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"137 ","pages":"Article 104889"},"PeriodicalIF":5.0000,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Theoretical and Applied Fracture Mechanics","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0167844225000473","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}

引用次数: 0

Abstract

Cyclic liquid nitrogen (LN₂) fracturing is a promising innovative technology expected to rapidly form fracture networks in geothermal reservoirs. The fracture characteristics are crucial for estimating the effect of the artificial fracturing. Therefore, a cyclic heating-rapid cooling (CHRC) experiment is conducted on the notched semi-circular bend (NSCB) granite, where LN₂ and water cooling are employed. The structural damage and fracture characteristics of the CHRC treated sample are analyzed using ultrasonic detection, three-point bending test, and acoustic emission (AE) technique. A grain-based model with thermo‑mechanical coupling is constructed to explore the micro-cracking mechanism of the CHRC treatment. The results indicate that the damage caused by the CHRC increases significantly in the first five cycles, especially under LN₂ cooling. The decline of fracture toughness with cycles under different cooling methods. LN₂ cooling can dramatically enhance the AE energy release and fracture surface roughness in the initial cycles. LN₂ cooling can promote the generation of tensile cracks and intra-granular microcracks. The fracture behaviors of the CHRC treated granite are mainly determined by the stable thermal stress, significantly affected by mineral distribution. These results can provide a comprehensive understanding of cyclic LN₂ fracturing compared to hydraulic fracturing, supporting theoretical guidance for geothermal extraction.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

求助全文

约1分钟内获得全文去求助

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.