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Dynamic compression experiments on cubic polymethyl methacrylate (PMMA) specimens and two kinds of trapezoid PMMA specimens are carried by changing the transmission bars into steel bar and aluminum bar on the experimental device of split Hopkinson pressure bar (SHPB). The compression processes of PMMA specimens are recorded by high-speed photography, and the breakage processes of PMMA specimens are analyzed based on the force displacement curves and high-speed images. The evolutions of deformation and diffusion resistances of PMMA specimens under impact loading are discussed. The results show that the failure of the sample is caused mainly by the partial failure front at the contact end, and then the failure front propagates to the inside of the sample, leading the sample to break. The failure front of cubic sample is generated preferentially at the transmission end under low speed impact and at the incident end under the higher speed impact. After changing the shape of the specimen and the material of the transmission bar, the relaxation phenomenon is prominent, and the failure front occurs only at the incident end. The compressive deformation of the trapezoid sample before breakage is non-uniform, and the stress and strain in the sample gradually decrease with the increase of the cross section, and show a linear diffusion distribution. The strain distribution and shear activation diffusion equation are used to obtain the generalized diffusion resistance distribution of the failure front. The generalized diffusion resistance increases first in front of the failure front and decreases after the failure front, and the amplitude of the generalized diffusion resistance is related to the release of local strain energy.
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图 1 试样规格 (a) 立方体试样; (b) 梯台试样; (c) 梯台试样简图
Figure 1. Sample specifications: (a) Cube sample; (b) trapezoid sample; (c) diagram of the trapezoid sample.
图 2 SHPB 实验装置
Figure 2. Schematic diagram of the modified SHPB device.
图 3 冲击过程中的载荷位移曲线和破碎过程 (a1) 透射杆为钢杆时立方体试样的力位移曲线; (a2) 冲击速度为7.8 m/s时立方体试样的破坏过程; (b1)透射杆为钢杆时梯台试样Ⅰ的力位移曲线; (b2) 梯台试样Ⅰ的破坏过程(冲击速度为12.38 m/s); (c1)透射杆为铝杆时梯台试样Ⅰ的力位移曲线; (c2) 透射杆为铝杆时梯台试样Ⅰ的破坏过程(冲击速度为15.45 m/s). 橙色箭头表示冲击方向
Figure 3. Load displacement curve and crushing process during impact: (a1) Load displacement curve of cube sample under steel transmission bar; (a2) cube sample deformation process under impact velocity of 7.8 m/s; (b1) load displacement curve of trapezoid sample Ⅰ under steel transmission bar; (b2) trapezoid sample Ⅰ under steel transmission bar (impact velocity of 12.38 m/s); (c1) load displacement curve of trapezoid sample Ⅰ under aluminum transmission bar; (c2) trapezoid sample Ⅰ under aluminum transmission bar (impact velocity of 15.45 m/s). The orange arrow denotes the impact direction.
图 4 梯台试样Ⅰ在钢杆下的应变分布 (冲击速度13.3 m/s) (a) DIC计算区域; (b) 高速摄影图片; (c) 2D等效剪应变场(箭头表示冲击方向)
Figure 4. Strain distribution of trapezoid sample Ⅰ under steel transmission bar (impact velocity of 13.3 m/s): (a) Area of DIC calculation; (b) high speed images; (c) 2D equivalent shear strain field (The arrow denotes the impact direction).
图 5 梯台Ⅰ试样在铝杆下的应变分布 (冲击速度16.21 m/s) (a) 高速摄影图片; (b) 2D等效剪应变场(箭头表示冲击方向)
Figure 5. Strain distribution of trapezoid sample Ⅰ under aluminum transmission bar (impact velocity of 16.21 m/s): (a) High speed images; (b) 2D equivalent shear strain field. (The arrow denotes the impact direction.)
图 6 沿冲击方向的平均等效剪应变分布 (a) 梯台试样Ⅰ在冲击速度为13.3 m/s、透射杆为钢杆时的应变分布; (b) 梯台试样Ⅰ在冲击速度为16.21 m/s、透射杆为铝杆时的应变分布
Figure 6. Average equivalent shear strain distribution along impact direction: (a) Trapezoid sample Ⅰ under steel transmission bar (impact velocity of 13.3 m/s); (b) trapezoid sample Ⅰ under aluminum transmission bar (impact velocity of 16.21 m/s).
图 7 不同时刻试样内的应力分布
Figure 7. Stress distribution in sample at different time.
图 8 破碎时试样内的广义扩散阻力分布
Figure 8. Generalized diffusion resistance force distribution in the sample during breakage.
表 1 试样两端应力差统计
Table 1. Statistics of stress differences between two ends of sample.
试样 透射杆 应变率/s–1 应力差异 立方体 钢杆 600 <2.5% 梯台Ⅰ 500 20.4%—22.1% 梯台Ⅱ 600 33.8%—35.2% 梯台Ⅰ 铝杆 600 23.3%—25.5% 梯台Ⅱ 750 37.2%—43.1% 
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[1] 徐松林, 单俊芳, 王鹏飞 2020 现代应用物理 11 30101
Google Scholar
Xu S L, Shan J F, Wang P F 2020 Mod. Appl. Phys. 11 30101
Google Scholar
[2] 马棋棋, 熊迅, 郑宇轩, 周风华 2019 高压物理学报 33 044101
Google Scholar
Ma Q Q, Xiong X, Zheng Y X, Zhou F H 2019 Chin. J. High Pressure Phys. 33 044101
Google Scholar
[3] Huang J, Xu S, Hu S 2013 Rock Mech. Rock Eng. 47 1727
[4] 陈兴, 马刚, 周伟, 赖国伟, 来志强 2018 物理学报 67 146102
Google Scholar
Chen X, Ma G, Zhou W, Lai G W, Lai Z Q 2018 Acta Phys. Sin. 67 146102
Google Scholar
[5] Jiang H B, Xu S L, Shan J F, Wang D R, Liu Y G, Zhou L J, Wang P F 2019 Powder Technol. 353 359
Google Scholar
[6] Shan J, Xu S, Liu Y G, Zhou L J, Wang P F 2018 Powder Technol. 330 317
Google Scholar
[7] Potapov A V, Campbell C S 1997 Powder Technol. 93 13
Google Scholar
[8] Rasorenov S V, Kanel G I, Fortov V E, Abasehov M M 1991 Int. J. High Pressure Res. 6 225
Google Scholar
[9] Espinosa H D 1998 Mech. Mater. 29 219
Google Scholar
[10] 冯晓伟, 李俊承, 王洪波, 常敬臻 2016 物理学报 65 166201
Google Scholar
Feng X W, Li J C, Wang H B, Chang J Z 2016 Acta Phys. Sin. 65 166201
Google Scholar
[11] Anderson Jr C E, Bigger R P, Weiss C E 2014 Int. J. Appl. Glass Sci. 5 374
Google Scholar
[12] Huang J Y, Li Y, Liu Q C, Zhou X M, Liu L W, Liu C L, Zhu H M, Luo S N 2015 Phys. Rev. B 92 144101
Google Scholar
[13] Sheikh M Z, Atif M, Li Y L, Zhou F H, Raza M A, Dar U A, Gao G Z, Wang Y M 2021 Constr. Build. Mater. 288 123088
Google Scholar
[14] 易洪昇, 徐松林, 单俊芳, 张鸣 2017 爆炸与冲击 37 913
Google Scholar
Yi H S, Xu S L, Shan J F, Zhang M 2017 Explosion and Shock Waves 37 913
Google Scholar
[15] 宋一平, 苗春贺, 单俊芳, 王鹏飞, 徐松林 2022 爆炸与冲击 42 073103
Google Scholar
Song Y P, Miao C H, Shan J F, Wang P F, Xu S L 2022 Explosion and Shock Waves 42 073103
Google Scholar
[16] 方继松, 王珠, 熊迅, 郑宇轩, 周凤华 2020 高压物理学报 34 014101
Google Scholar
Fang J S, Wang Z, Xiong X, Zheng Y X, Zhou F H 2020 Chin. J. High Pressure Phys. 34 014101
Google Scholar
[17] Miao C H, Xu S L, Song Y P, Xie Y S, Yuan L Z, Wang P F 2022 Powder Technol. 397 117081
Google Scholar
[18] Liu D, Shen L, Guillard F, Einav I 2016 Int. J. Impact Eng. 93 222
Google Scholar
[19] 简世豪, 苗春贺, 张磊, 单俊芳, 王鹏飞, 徐松林 2021 高压物理学报 35 024202
Google Scholar
Jian S H, Miao C H, Zhang L, Shan J F, Wang P F, Xu S L 2021 Chin. J. High Pressure Phys. 35 024202
Google Scholar
[20] Xing H Z, Zhang Q B, Braithwaite C H, Pan B, Zhao J 2017 Rock Mech. Rock Eng. 50 1611
Google Scholar
[21] Zhou L, Xu S, Shan J, Liu Y, Wang P 2018 Mech. Mater. 123 1
Google Scholar
[22] Grady D 2017 Phys. Shock Impact (Vol. 1) (London: IOP Publishing) pp2-57–2-68
[23] Mott N F 1947 Proc. R. Soc. London, Ser. A 189 300
Google Scholar
[24] Feng R 2000 J. Appl. Phys. 87 1693
Google Scholar
[25] 刘占芳, 常敬臻, 姚国文, 张凯, 李建鹏 2006 力学学报 38 626
Google Scholar
Liu Z F, Chang J Z, Yao G W, Zhang K, Li J P 2006 Chin. J. Theor. Appl. Mech. 38 626
Google Scholar
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