欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
采用新型数字激光动态焦散线试验系统，对含孔洞缺陷和预制边裂纹的半圆盘试件进行了三点弯曲动态冲击实验。实验结果表明：在动态冲击载荷作用下，试件边裂纹处的应力集中程度较试件内部的孔洞缺陷处的应力集中程度更加显著；当孔洞位于裂纹前方时，孔洞对裂纹的扩展速度有抑制作用，且这种抑制作用随着孔洞与边裂纹尖端距离的增加有所减弱；当裂纹再次从孔洞处起裂时，裂纹的扩展速度和应力强度因子和裂纹与孔洞贯通前相比，均出现较大的上升，试件S1、S2中，裂纹扩展速度分别上升了1070％、138％，相应的裂纹尖端应力强度因子分别上升了61％、67％；裂纹的扩展速度与裂纹尖端的应力强度因子呈一定的正相关性，但受裂纹前方附近孔洞周围应力场的影响，裂纹尖端的应力强度因子有一定提高。
英文摘要：
Using new digital lazar dynamic caustics system, the dynamic fracture behavior of semicircular specimen containing empty holes subiected to impact loading was studied. The results show that, under dynamic impact loading, the stress concentration at the tip of edge cracks was greater than that at empty holes; when the empty holes were in front of running crack, the empty holes made the crack propagating velocity decreased,which decreased with the displacement between empty holes and the tip of edge cracks increasing; when the crack propagated again, compared to the crack propagating velocity and stress intensity factor at coalescence time, the crack propagating velocity for specimen S1,S2 increased by 1070 %, 138 %, respectively, stress intensity factor for specimen S1, S2 increased by 61%, 67 % respectively; the dynamic stress intensity factor was po sitively correlated with the crack propagating velocity, but the stress intensity factor increased before coalescence time because of the empty holes.
同期刊论文项目
同项目期刊论文
Application on intelligent system for optimization design of blasting in mine tunnel excavation of c
High-strength steel tubular confined concrete supports support technology for large section soft roc
Method for pinpointing the contacts of oil, gas and water by common contour binning stacking and its
Experimental study on the effect of initial compression stress field on blast-induced crack behavior
Experimental study of dynamic fracture effect of blasting crack in slotted cartridge decoupling char
SEM experiment of rock crack cross section morphology after explosion fracturing with slotted cartri
期刊信息
位置：