正入射爆炸应力波与运动裂纹作用的动态光弹性实验研究
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摘要
采用动态光弹性实验方法,研究了正入射爆炸应力波对运动裂纹的作用效果。实验得到了运动裂纹与正入射爆炸应力波作用过程的光弹等差条纹变化图,分析了正入射爆炸应力波对运动裂纹尖端动态应力强度因子和裂纹扩展速度的影响效果,以及正入射爆炸应力波对运动裂纹扩展轨迹的影响。研究表明:正入射爆炸应力波对运动裂纹扩展方向没有明显影响,但对运动裂纹尖端动态应力强度因子和裂纹扩展速度有显著时间相关性的抑制和增强作用;当正入射爆炸应力波P波前端压缩脉冲相与运动裂纹相互作用时,裂纹扩展速度和裂纹尖端应力强度因子会受到抑制;当正入射爆炸应力波P波尾部拉伸脉冲相和S波与运动裂纹相互作用时,裂纹扩展速度和裂纹尖端应力强度因子则得到显著增强。
Dynamic photoelasticity was utilized in an experiment to study the interaction of normal incidence blasting stress waves with a running crack.Photoelastic isochromatic fringe pattern of the interaction of normal incidence blasting stress waves with a running crack was obtained.Experimental data were analyzed to study the effect of the normal incidence of stress wave on the dynamic stress intensity factor,crack propagation velocity and crack growth trajectory at the crack tip.The results indicate that the normal blasting stress wave has no effect on the propagation direction of crack,but it has a significant time-dependent inhibition or enhancement effect on the dynamic stress intensity factor and velocity of the crack tip.The crack propagation velocity and the stress intensity factor at the crack tip are suppressed when the forward impinging P wave front compressive pulse phase interacts with the running crack.The crack propagation velocity and the stress intensity factor at the crack tip increase when the normal incident P wave tail ten-sile pulse phase and S wave interacts with the running crack.
Dynamic photoelasticity was utilized in an experiment to study the interaction of normal incidence blasting stress waves with a running crack.Photoelastic isochromatic fringe pattern of the interaction of normal incidence blasting stress waves with a running crack was obtained.Experimental data were analyzed to study the effect of the normal incidence of stress wave on the dynamic stress intensity factor,crack propagation velocity and crack growth trajectory at the crack tip.The results indicate that the normal blasting stress wave has no effect on the propagation direction of crack,but it has a significant time-dependent inhibition or enhancement effect on the dynamic stress intensity factor and velocity of the crack tip.The crack propagation velocity and the stress intensity factor at the crack tip are suppressed when the forward impinging P wave front compressive pulse phase interacts with the running crack.The crack propagation velocity and the stress intensity factor at the crack tip increase when the normal incident P wave tail ten-sile pulse phase and S wave interacts with the running crack.
引文
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[17]岳中文,杨仁树,董聚才,等.爆炸载荷下板条边界斜裂纹的动态扩展行为[J].爆炸与冲击,2011,31(1):75-80.YUE Zhongwen,YANG Renshu,DONG Jucai,et al.Dynamic propagation behaviors of an oblique edge crack in material under blast loading[J].Explosion and Shock Waves,2011,31(1):75-80.
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[20]高家美,刘益河,宋育仁.光弹性法在矿山工程中的应用[M].北京:煤炭工业出版社,1989:330-336.
[2]EWING W M,JARDETZKY W S,PRESS F.Elastic waves in layered media[M].New York:Mc Graw-Hill Book Company,Inc.,1957.
[3]RINEHART,JOHN S.Stress transients in solids[M].Santa Fe:Hyper Dynamics,1975.
[4]DOU Linming,MU Zonglong,LI Zhenlei,et al.Research progress of monitoring,forecasting,and prevention of rockburst in underground coal mining in China[J].International Journal of Coal Science&Technology 2014,1(3):278-288.
[5]RAVI-Chandar K,KNAUSS W G.An experimental investigation into dynamic fracture:IV.On the interaction of stress waves with propagating cracks[J].International Journal of Fracture,1984,26(3):189-200.
[6]ING Y S,MA C C.Theoretical simulations of a propagating crack subjected to in-plane stress wave loading by caustic method[J].International Journal of Fracture,1997,85(4):313-331.
[7]BONAMY D,RAVI-Chandar K.Interaction of shear waves and propagating cracks[J].Physical Review Letters,2003,91(23):235502
[8]DALLY J W.An introduction to dynamic photoelasticity[J].Experimental Mechanics,1980,20(12):409-416.
[9]ROSSMANITH H P,SHUKLA A.Dynamic photoelastic investigation of interaction of stress waves with running cracks[J].Experimental Mechanics,1981,21(11):415-422.
[10]ROSSMANITH H P,FOURNEY W L.Fracture initiation and stress wave diffraction at cracked interfaces in layered media I.brittle/brittle transition[J].Rock Mechanics and Rock Engineering,1982,14(4):209-233.
[11]朱振海.爆炸应力波与径向裂纹相互作用的动光弹研究[J].解放军理工大学学报,自然科学版,1987,3(2):81-88..ZHU Zhenhai.Dynamic photoelastic study of stress wave interacting with radial cracks[J].Journal of PLA University of Science and Technology,Natural Science Edition,1987,3(2):81-88.
[12]朱振海.应力波对裂纹扩展影响的动光弹研究[J].解放军理工大学学报,自然科学版,1988,4(4):78-84.ZHU Zhenhai.Dynamic photoelastic research of stress wave influence to crack[J].Journal of PLA University of Science and Technology,Natural Science Edition,1988,4(4):78-84.
[13]朱振海.爆炸应力波对高速扩展裂纹影响的动态光弹性试验研究[J].爆炸与冲击,1993,13(2):178-184.ZHU Zhenhai.Dynamic photoelastic investigations of the effect of explosive stress waves on an extending-high speed crack[J].Explosion and Shock Waves,1993,13(2):178-184.
[14]李夕兵.论岩土软弱结构面对应力波传播的影响[J].爆炸与冲击,1993,13(4):334-342.LI Xibing.Influence of the structural weakness planes in rock mass on the propagation of stress waves[J].Explosion and Shock Waves,1993,13(4):334-342.
[15]郭占起,费志中,吴明棣.不同爆炸加载参数下含裂纹试件的动光弹数值分析[J].北方交通大学学报,1994,18(1):81-88.GUO Zhanqi,FEI Zhizhong,WU Mingdi.Dynamic photoelastic numerical analysis of specimens contairing cracks[J].Journal of Northern Jiaotong University,1994,18(1):81-88.
[16]王明洋,钱七虎.爆炸应力波通过节理裂隙带的衰减规律[J].岩土工程学报,1995,17(2):42-46.WANG Mingyang,QIAN Qihu.Attenuation law of explosive wave propagation in cracks[J].Chinese Journal of Geotechnical Engineering,1995,17(2):42-46.
[17]岳中文,杨仁树,董聚才,等.爆炸载荷下板条边界斜裂纹的动态扩展行为[J].爆炸与冲击,2011,31(1):75-80.YUE Zhongwen,YANG Renshu,DONG Jucai,et al.Dynamic propagation behaviors of an oblique edge crack in material under blast loading[J].Explosion and Shock Waves,2011,31(1):75-80.
[18]苏先基,励争.固体力学动态测试技术[M].北京:高等教育出版社,1997:115-158.
[19]DALLY J W,SANFORD R J.Classification of stress-intensity factors from isochromatic-fringe patterns[J].Experimental Mechanics,1979,19(5):175-175.
[20]高家美,刘益河,宋育仁.光弹性法在矿山工程中的应用[M].北京:煤炭工业出版社,1989:330-336.