DETERMINATION OF ENERGY-BASED FRACTURE PARAMETERS OF CONCRETE UNDER COMPACT TENSION
The paper presents a model to predict crack propagation in concrete materials using energy-based fracture parameter, wherein fracture toughness in terms of energy release rate was introduced to predict the crack unstable propagation. Due to the presence of the fracture process zone (FPZ) ahead of a crack, energy for crack propagation should partially be consumed to overcome cohesive force acting on the surface within the FPZ. Then, the energy needed for unstable fracture could be estimated based on energy balance principle. Test data from compact tension concrete specimens were used to validate the proposed model. Results of the evaluation indicate that the values of the proposed fracture toughness are independent of the specimen size, and could be used as one controlling parameter for predicting unstable failure of concrete material. Simultaneously, comparison with the double-K fracture parameters in light of stress intensity factor confirms the equivalence of stress-field methodology and energy-balance methodology to characterize crack propagation.
Concrete Cohesive force Compact tension Cracking Energy release rate Fracture toughness
Yanhua ZHAO Shilang XU
Civil Engineering Department, Dalian University of Technology, China Civil Engineering Department, Zhejiang University, China
国际会议
The Second Asia-Pacific Young Researchers and Graduates Symposium(第二届亚太地区结构青年专家研讨会)
杭州
英文
196-207
2010-03-27（万方平台首次上网日期，不代表论文的发表时间）