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《Engineering Mechanics》 2013-09
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EXPERIMENTAL STUDY ON FRACTURE EVALUATION CRITERION OF ULTRA-HIGH TOUGHNESS CEMENTITIOUS COMPOSITES

LIU Wen;XU Shi-lang;LI Qing-hua;Key Laboratory of Soil & Water Conservation and Desertification Combating,Ministry of Education,Beijing Forestry University;Institute of Structural Engineering,Dalian University of Technology;Institute of Advanced Engineering Structures and Materials,Zhejiang University;  
A three-point fracture test was taken out on single notched beams of ultra-high toughness cementitious composites(UHTCC),with three fiber volume fractions of 1.5%,2.0% and 2.5%,in order to investigate the fracture property of this material.Ductile fracture exhibits for this material.On the basis of nonlinear fracture mechanics,the double-J criterion,that is the starting point of ductile stage,JIC,and the starting point of failure stage,JIF,is applied to estimate the fracture toughness of UHTCC.When J JIC,there is no macrocrack;J JIF,the failure crack is localized;and JIC J ≤ JIF,the deformation develops stably.Based on the experimental results,the JR curve of UHTCC has three stages,with the dividing points of initial cracking and crack localizing.Furthermore,equal fracture energy is required for the equal quantity of crack growth.
【Fund】: 中央高校基本科研业务费专项资金项目(BLX2012046);; 国家自然科学基金重点项目(51008270)
【CateGory Index】: TU525
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