Tests for interaction of unilateral offset cracks

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (17) : 121-127.

YANG Ren-shu1,2 CHEN Cheng1 FU Xiaoqiang1 LIN Hai1 DING Chenxi1

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Abstract

Here, in order to study effects of cracks interaction in brittle medium on crack growth morphology, the dynamic caustics method was used to conduct 3-point bend impact dynamic tests taking PMMA as a similar material.The results showed that under the condition of impact load, cracks interaction affects crack initiation time, crack tip stress field and crack deflection direction; cracks interaction causes decreases in stress intensity factor KdI during crack initiation and time required for crack initiation energy accumulation; in initial stage of crack propagation, shear stress component of single-offset crack tip stress field is positive and stress intensity factor KdII is larger than zero, while shear stress component of crack tip stress field at the same position of unilateral offset parallel double cracks is negative and KdII is less than zero; when crack position is 10 mm away from center position, a single-offset crack deflects to inside after its initiation, a crack at the same positon of unilateral offset parallel double cracks deflects to outside.

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unilateral offset crack / crack interaction / dynamic caustics / crack deflection

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YANG Ren-shu1,2 CHEN Cheng1 FU Xiaoqiang1 LIN Hai1 DING Chenxi1. Tests for interaction of unilateral offset cracks[J]. Journal of Vibration and Shock, 2019, 38(17): 121-127

References

[1] 王炳军, 肖洪天, 岳中琦. 半无限横观各向同性介质中多裂纹相互作用分析[J]. 岩土力学, 2012, 33(8): 2527-2535.
WANG Bingjun, XIAO Hongtian, YUE Zhongqi. Interaction between two rectangular cracks in a transversely isotropic medium of semi-infinite extent[J]. Rock and Soil Mechanics, 2012, 33(8): 2527-2535.
[2] 席婧仪, 陈忠辉, 张伟. 单轴拉伸作用下不等长裂纹相互影响的断裂力学分析[J]. 岩石力学与工程学报, 2014, 33(A02): 3625-3630.
XI Jingyi, CHEN Zhonghui, ZHANG Wei. Fracture mechanics analysis of unequal cracks interaction under uniaxial tension[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(A02): 3625-3630.
[3] 李银平, 王元汉, 肖四喜. 岩石类材料中压剪裂纹的相互作用分析[J]. 岩石力学与工程学报, 2003, 22(4): 552-555.
LI Yingping, Wang Yuanhan, XIAO Sixi. Interaction of frictional cracks in rock-like materials[J]. Chinese Journal of Rock Mechanics and Engineering, 2003, 22(4): 552-555.
[4] 杨仁树, 左进京, 岳中文, 等. 爆炸载荷作用下相向裂纹扩展行为的实验研究[J]. 煤炭学报, 2017, 42(05): 1093-1098.
YANG Renshu, ZUO Jinjing, YUE Zhongwen, et al. Experimental study on opposite cracks propagation behavior under blast loading[J]. Journal of China Coal Society, 2017, 42(05): 1093-1098.
[5] 杨仁树, 许鹏, 岳中文, 等. 圆孔缺陷与 I 型运动裂纹相互作用的试验研究[J]. 岩土力学, 2016, 37(6): 1597-1602.
YANG Renshu, XU Peng, YUE Zhongwen, et al. Laboratory study of interaction between a circular hole defect and mode I moving crack[J]. Rock and Soil Mechanics, 2016, 37(6): 1597-1602.
[6] 杨仁树, 丁晨曦, 杨立云, 等. 含异侧偏置裂纹试件的冲击断裂试验[J]. 科学技术与工程, 2017, 17(10): 1-5.
YANG Renshu, DING Chenxi, YANG Liyun, et al. Impact fracture tests for specimens containing bilateral off-center cracks[J]. Science Technology and Engineering, 2017, 17(10): 1-5.
[7] 高桂云, 周洁, 励争. 脆性材料裂纹与损伤相互作用的试验研究[J]. 岩石力学与工程学报, 2017, 36(11): 2650-2661.
GAO Guiyun, ZHOU Jie, LI Zheng. Experimental study on the interaction of crack and defects of brittle materials under dynamic loading[J]. Chinese Journal of Rock Mechanics and Engineering, 2017, 36(11): 2650-2661.
[8] 王雁冰, 杨仁树, 丁晨曦, 等. 双孔爆炸应力波作用下缺陷介质裂纹扩展的动焦散试验[J]. 煤炭学报, 2016, 41(07): 1755-1761.
WANG Yanbing, YANG Renshu, DING Chenxi, et al. Dynamic caustics experiment on crack propagation of defective medium under the effect of explosive stress waves of double holes[J]. Journal of China Coal Society, 2016, 41(07): 1755-1761.
[9] Yao X F, Xu W, Xu M Q, et al. Experimental study of dynamic fracture behavior of PMMA with overlapping offset-parallel cracks[J]. Polymer testing, 2003, 22(6): 663-670.
[10] 岳中文, 宋耀, 邱鹏, 等. 冲击载荷下双预置裂纹三点弯曲梁动态断裂实验[J]. 振动与冲击, 2017, 36(4): 151-156.
YUE Zhongwen, SONG Yao, QIU Peng, et al. A dynamic fracture experiment of a three-point-bend beam containing double pre-existing cracks under impact load[J]. Journal of Vibration and Shock, 2017, 36(4): 151-156.
[11] 岳中文, 宋耀, 王煦, 等. 不同倾角预制裂纹缺陷与运动裂纹的相互作用[J]. 爆炸与冲击, 2017, 37(1): 162-168.
YUE Zhongwen, SONG Yao, WANG Xu, et al. Interaction between a pre-existing crack defect with different angles and a running crack[J]. Explosion and Shock Waves, 2017, 37(1): 162-168.
[12] 杨立云, 张勇进, 孙金超, 等. 偏置裂纹对含双裂纹 PMMA 试件动态断裂影响效应研究[J]. 矿业科学学报, 2017, 2(4): 330-335.
YANG Liyun, ZHANG Yongjin, SUN Jinchao, et al. The effect of offset distance on dynamic fracture behavior of PMMA with double cracks[J]. Journal of Mining Science and Technology, 2017, 2(4): 330-335.
[13] 李清, 张迪, 杨阳, 等. 含单侧预制裂纹梁的冲击动态断裂过程试验研究[J]. 振动与冲击, 2015, 34(4): 205-210.
LI Qing, ZHANG Di, YANG Yang, et al. Dynamic fracture tests for a beam containing unilateral pre-existing cracks under impact loads[J]. Journal of Vibration and Shock, 2015, 34(4): 205-210.
[14] 卿海, 杨卫, 吕坚. 多条表面裂纹相互作用的应力分析[J]. 工程力学, 2009, 26(1): 1-7.
QING Hai, YANG Wei, LU Jian. Stress analysis of multiple surface cracks with interactions[J]. Engineering Mechanics, 2009, 26(1): 1-7.
[15] 黄明利, 唐春安, 梁正召. 岩石裂纹相互作用的应力场分析[J]. 东北大学学报: 自然科学版, 2001, 22(4): 446-449.
HUANG Mingli, TANG Chunan, LIANG Zhengzhao. Stress field analysis of interaction of rock cracks[J]. Journal of Northeastern University (Natural Science), 2001, 22(4): 446-449.
[16] 朱帝杰, 陈忠辉, 席婧仪, 等. 岩石平行偏置裂纹相互作用规律分析[J]. 岩土工程学报, 2017, 39(2): 235-243.
ZHU Dijie, CHEN Zhonghui, XI Jingyi, et al. Interaction between offset parallel cracks in rock[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(2): 235-243.
[17] Richard H A, Fulland M, Sander M. Theoretical crack path prediction[J]. Fatigue & fracture of engineering materials & structures, 2005, 28(1-2): 3-12.
[18] Kalthoff J F. On the propagation direction of bifurcated cracks[C]//Proceedings of an international conference on Dynamic Crack Propagation. Springer Netherlands, 1973: 449-458.
[19] Kalthoff J F. The shadow optical method of caustics[M]//Static and dynamic photoelasticity and caustics. Springer Vienna, 1987: 407-522.
[20] Theocaris P S, Papadopoulos G. Fracture Mechanics[M]//Mixed-mode dynamic stress intensity factors from caustics. ASTM STP, 1983: 320-337.
[21] Papadopoulos G A. Fracture Mechanics[M]//The experimental method of caustics and the Det.-Criterion of fracture. Springer-Verlag, 1993.
[22] YUE Z W, YANG L Y, WANG Y B. Experimental study of crack propagation in polymethyl methacrylate material with double holes under the directional controlled blasting[J]. Fatigue & Fracture of Engineering Materials & Structures, 2013, 36(8): 827-833.