高压物理学报2026，Vol.40Issue(2)：18-29,12.DOI:10.11858/gywlxb.20251046
混凝土拉伸断裂特性及动态裂纹演化规律
Tensile Fracture Characteristics and Dynamic Crack Evolution Law of Concrete
刘晋豪 1李金柱 1姚志彦 1张力伟1
作者信息
- 1. 北京理工大学爆炸科学与安全防护全国重点实验室,北京 100081
- 折叠
摘要
Abstract
To investigate the tensile fracture characteristics and crack evolution mechanisms of concrete,Brazilian disc quasi-static splitting tests and falling weight impact tests were conducted.The crack propagation and mechanical responses were analyzed using the finite cohesive-element method(FCEM).Test results demonstrated that under quasi-static loading,concrete discs exhibited tensile fracture with a primary crack penetrating along the loading direction at the disc center,accompanied by minor parallel secondary cracks.Crack propagation primarily occurred within the mortar matrix and along aggregate-mortar interfaces.The tensile performance of three-dimensional concrete discs exhibited significant enhancement with increasing thickness-diameter ratio.Under dynamic impact loading,specimens maintained a center-initiated fracture pattern,where the main crack propagated along the loading diameter,while triangular crushing zones formed at the edges in contact with testing apparatus.With increasing drop height,the specimens sequentially exhibited four distinct failure modes:no crack initiation,crack initiation without penetration,complete crack penetration,and severe fragmentation.High-speed photography quantified time-dependent crack lengths,demonstrating prolonged crack propagation durations at reduced drop heights.Numerical simulations revealed a nonlinear decreasing trend in crack initiation time versus drop height,with an empirical formula established to describe their relationship.关键词
动态加载/巴西圆盘/黏聚力模型/拉伸断裂/裂纹演化/起裂时间Key words
dynamic loading/Brazilian disc/cohesive zone model/tensile fracture/crack evolution/crack initiation time分类
数理科学引用本文复制引用
刘晋豪,李金柱,姚志彦,张力伟..混凝土拉伸断裂特性及动态裂纹演化规律[J].高压物理学报,2026,40(2):18-29,12.
