{"title":"基于速率相关黏结界面法和中尺度模型的混凝土动态断裂性能试验验证","authors":"Li Sun , Xingye Wang , Chunwei Zhang","doi":"10.1016/j.mechmat.2025.105397","DOIUrl":null,"url":null,"abstract":"<div><div>This study investigates the dynamic fracture behavior of concrete under higher loading rate using a combination of notch semi-circular bending (NSCB) experiments and rate-dependent cohesive zone modelling (CZM). The experimental setup employed a split Hopkinson pressure bar (SHPB) system coupled with high-speed digital image correlation (DIC) to capture real-time crack propagation and deformation. A 2D mesoscale finite element model was developed using digital image processing (DIP) and random aggregate generation techniques to replicate the heterogeneous microstructure of concrete. Cohesive elements with velocity-dependent traction-separation laws were integrated at interfacial transition zones (ITZ) and aggregate-matrix interfaces to simulate crack initiation and growth. Results revealed that dynamic fracture toughness increased linearly with loading rates, with peak values up to 144 % higher than quasi-static counterparts at 120 MPa. Notch angle significantly influenced mixed-mode fracture toughness, with a maximum <em>K</em><sub><em>IIC</em></sub> of 5.165 observed at a 30° notch angle. The study demonstrated that incorporating rate effects and microstructural heterogeneity into cohesive models improves predictive accuracy, offering critical insights for designing concrete structures subjected to dynamic loading.</div></div>","PeriodicalId":18296,"journal":{"name":"Mechanics of Materials","volume":"208 ","pages":"Article 105397"},"PeriodicalIF":4.1000,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Experimental verification of dynamic fracture performance of concrete via rate-dependent cohesive interface approach and mesoscale model\",\"authors\":\"Li Sun , Xingye Wang , Chunwei Zhang\",\"doi\":\"10.1016/j.mechmat.2025.105397\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This study investigates the dynamic fracture behavior of concrete under higher loading rate using a combination of notch semi-circular bending (NSCB) experiments and rate-dependent cohesive zone modelling (CZM). The experimental setup employed a split Hopkinson pressure bar (SHPB) system coupled with high-speed digital image correlation (DIC) to capture real-time crack propagation and deformation. A 2D mesoscale finite element model was developed using digital image processing (DIP) and random aggregate generation techniques to replicate the heterogeneous microstructure of concrete. Cohesive elements with velocity-dependent traction-separation laws were integrated at interfacial transition zones (ITZ) and aggregate-matrix interfaces to simulate crack initiation and growth. Results revealed that dynamic fracture toughness increased linearly with loading rates, with peak values up to 144 % higher than quasi-static counterparts at 120 MPa. Notch angle significantly influenced mixed-mode fracture toughness, with a maximum <em>K</em><sub><em>IIC</em></sub> of 5.165 observed at a 30° notch angle. The study demonstrated that incorporating rate effects and microstructural heterogeneity into cohesive models improves predictive accuracy, offering critical insights for designing concrete structures subjected to dynamic loading.</div></div>\",\"PeriodicalId\":18296,\"journal\":{\"name\":\"Mechanics of Materials\",\"volume\":\"208 \",\"pages\":\"Article 105397\"},\"PeriodicalIF\":4.1000,\"publicationDate\":\"2025-05-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Mechanics of Materials\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0167663625001590\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mechanics of Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0167663625001590","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Experimental verification of dynamic fracture performance of concrete via rate-dependent cohesive interface approach and mesoscale model
This study investigates the dynamic fracture behavior of concrete under higher loading rate using a combination of notch semi-circular bending (NSCB) experiments and rate-dependent cohesive zone modelling (CZM). The experimental setup employed a split Hopkinson pressure bar (SHPB) system coupled with high-speed digital image correlation (DIC) to capture real-time crack propagation and deformation. A 2D mesoscale finite element model was developed using digital image processing (DIP) and random aggregate generation techniques to replicate the heterogeneous microstructure of concrete. Cohesive elements with velocity-dependent traction-separation laws were integrated at interfacial transition zones (ITZ) and aggregate-matrix interfaces to simulate crack initiation and growth. Results revealed that dynamic fracture toughness increased linearly with loading rates, with peak values up to 144 % higher than quasi-static counterparts at 120 MPa. Notch angle significantly influenced mixed-mode fracture toughness, with a maximum KIIC of 5.165 observed at a 30° notch angle. The study demonstrated that incorporating rate effects and microstructural heterogeneity into cohesive models improves predictive accuracy, offering critical insights for designing concrete structures subjected to dynamic loading.
期刊介绍:
Mechanics of Materials is a forum for original scientific research on the flow, fracture, and general constitutive behavior of geophysical, geotechnical and technological materials, with balanced coverage of advanced technological and natural materials, with balanced coverage of theoretical, experimental, and field investigations. Of special concern are macroscopic predictions based on microscopic models, identification of microscopic structures from limited overall macroscopic data, experimental and field results that lead to fundamental understanding of the behavior of materials, and coordinated experimental and analytical investigations that culminate in theories with predictive quality.