Mechanical characteristics and fracturing behavior of rock-concrete composite specimens with two pre-existing parallel flaws under uniaxial compression based on AE and DIC systems

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-02-04 DOI:10.1016/j.tafmec.2025.104866

Tengfei Guo , Kewei Liu , Houqiang Wang , Xuefeng Si , Yichao Rui , Chengzhi Pu , Yi Zhang , Congxiang Yuan

{"title":"Mechanical characteristics and fracturing behavior of rock-concrete composite specimens with two pre-existing parallel flaws under uniaxial compression based on AE and DIC systems","authors":"Tengfei Guo , Kewei Liu , Houqiang Wang , Xuefeng Si , Yichao Rui , Chengzhi Pu , Yi Zhang , Congxiang Yuan","doi":"10.1016/j.tafmec.2025.104866","DOIUrl":null,"url":null,"abstract":"<div><div>The crack propagation and coalescence behavior of rock-concrete composite structures with parallel double flaws is crucial for stability evaluation of rock-based concrete engineering projects. A uniaxial compression experiment was performed on rock-concrete composite (RCC) specimen in this study, and the crack extension process of RCC specimens was recorded with digital image correlation (DIC) equipment and acoustic emission (AE) equipment. The impacts of the inclination angles for flaws and rock-concrete interface planes on mechanical behavior and fracture process of RCC specimens were studied. The results reveal that fracture modes of specimens under compressive loading can be categorized into the following types: crack coalescing modes in different materials, crack extension modes in one material and crack extension modes in different materials. The initiation of cracks does not occur synchronously in different materials. Cracks in rock and concrete penetrate the interface and merge at low interface inclination angle, whereas interface cracks are generally formed at higher interface inclination angle, which inhibits crack coalescing in different materials. The coalescing of cracks between varying material is controlled by strength ratio. Increased concrete strength intensifies crack failure in rocks, facilitating crack penetration at the interface, while also strengthening the composite specimen and widening the peak strength differences across various flaw inclination angles. The peak strength is greatly affected by interface inclination angle. Furthermore, interface inclination angle and flaw inclination angle play an essential part in energy evolution. When interface inclination angle enlarges, the peak elastic strain energy first descends and subsequently ascends. The energy storage limit rises with enlarging the flaw inclination angle.</div></div>","PeriodicalId":22879,"journal":{"name":"Theoretical and Applied Fracture Mechanics","volume":"136 ","pages":"Article 104866"},"PeriodicalIF":5.0000,"publicationDate":"2025-02-04","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/S0167844225000242","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

The crack propagation and coalescence behavior of rock-concrete composite structures with parallel double flaws is crucial for stability evaluation of rock-based concrete engineering projects. A uniaxial compression experiment was performed on rock-concrete composite (RCC) specimen in this study, and the crack extension process of RCC specimens was recorded with digital image correlation (DIC) equipment and acoustic emission (AE) equipment. The impacts of the inclination angles for flaws and rock-concrete interface planes on mechanical behavior and fracture process of RCC specimens were studied. The results reveal that fracture modes of specimens under compressive loading can be categorized into the following types: crack coalescing modes in different materials, crack extension modes in one material and crack extension modes in different materials. The initiation of cracks does not occur synchronously in different materials. Cracks in rock and concrete penetrate the interface and merge at low interface inclination angle, whereas interface cracks are generally formed at higher interface inclination angle, which inhibits crack coalescing in different materials. The coalescing of cracks between varying material is controlled by strength ratio. Increased concrete strength intensifies crack failure in rocks, facilitating crack penetration at the interface, while also strengthening the composite specimen and widening the peak strength differences across various flaw inclination angles. The peak strength is greatly affected by interface inclination angle. Furthermore, interface inclination angle and flaw inclination angle play an essential part in energy evolution. When interface inclination angle enlarges, the peak elastic strain energy first descends and subsequently ascends. The energy storage limit rises with enlarging the flaw inclination angle.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

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.