Bamboo is an important building material with natural hygroscopicity,and the mechanism of water effects on its deformation and fracture behavior has not been fully revealed.For this purpose,a novel in-situ testing met...Bamboo is an important building material with natural hygroscopicity,and the mechanism of water effects on its deformation and fracture behavior has not been fully revealed.For this purpose,a novel in-situ testing method was developed in this study,which coupled Acoustic Emission(AE)and Digital Image Correlation(DIC)techniques.This method was used to investigate the effects of various Moisture Content(MC)levels(0,6%,15%,and 25%)on the tensile behavior of bamboo.The results showed that as the MC increased from 0 to 25%,the tensile strength of bamboo decreased from 163 to 110 MPa,the Young's modulus dropped from 8.5 to 3.9 GPa,and the elongation increased from 4.3 to 14%.An increase in MC could effectively promote the occurrence of subcritical cracks and micro-interfacial dissociations in bamboo.The synergistic effect of these two factors facilitated strain dispersion,ensuring adaptability to large deformations.Additionally,it was found that an increase in MC could significantly alter the fracture mode.This ingenious synergistic effect in bamboo was revealed for the first time in this study.The mechanisms discovered in this study may provide some important insights into the design and fabrication of advanced biomimetic heterostructures and biomimetic interfacial materials.展开更多
基金funded by the Jilin Provincial Department of Science and Technology Fund Project 20240404049ZPthe National Key R and D Program of China(2022YFA1604000)+5 种基金the National Science Fund for Distinguished Young Scholars(51925504)the Foundation for Innovative Research Groups of the National Natural Science Foundation of China(52021003)the National Natural Science Foundation of China 52075220the China Postdoctoral Science Foundation Funded Project 2024M751087the Postdoctoral Fellowship Program of CPSF under Grant GZC20230946the Open Research Project of the State Key Laboratory of Strength and Vibration of Mechanical Structures SV2024-KF-13.
文摘Bamboo is an important building material with natural hygroscopicity,and the mechanism of water effects on its deformation and fracture behavior has not been fully revealed.For this purpose,a novel in-situ testing method was developed in this study,which coupled Acoustic Emission(AE)and Digital Image Correlation(DIC)techniques.This method was used to investigate the effects of various Moisture Content(MC)levels(0,6%,15%,and 25%)on the tensile behavior of bamboo.The results showed that as the MC increased from 0 to 25%,the tensile strength of bamboo decreased from 163 to 110 MPa,the Young's modulus dropped from 8.5 to 3.9 GPa,and the elongation increased from 4.3 to 14%.An increase in MC could effectively promote the occurrence of subcritical cracks and micro-interfacial dissociations in bamboo.The synergistic effect of these two factors facilitated strain dispersion,ensuring adaptability to large deformations.Additionally,it was found that an increase in MC could significantly alter the fracture mode.This ingenious synergistic effect in bamboo was revealed for the first time in this study.The mechanisms discovered in this study may provide some important insights into the design and fabrication of advanced biomimetic heterostructures and biomimetic interfacial materials.
