一种新型软材料动态直接拉伸实验技术
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摘要
为了研究具有较低强度和较低波阻抗的软材料的高应变率动态拉伸力学性能,提出了一种采用空心铝管作为入射杆和透射杆的直接拉伸式SHTB实验装置。详细讨论了该实验装置几个关键问题,并提出了相应的解决方案。利用研发的实验装置对圆柱形丁氰橡胶试件进行试验,成功获得了丁氰橡胶在直接拉伸荷载作用下的应力波形曲线,并由此进一步得到了该材料在应变率为240 s~(-1)时的应力应变曲线。实验结果表明,提出的新型SHTB装置可更方便的用来测定软材料的高应变率动态拉伸力学性能,且操作简单,成功率高。
To investigate the dynamic tensile properties of soft material with low strength and low wave impedance,an improved SHTB facility was proposed. The specially designed hollow aluminum tubes were used as the incident bar and transmission bar in the proposed facility. Some key affecting issues in the facility were discussed,and the corresponding solutions were presented. A number of cylinder specimens made of butyl cyanide rubber were tested with this improved SHTB facility. The stress wave curve of the butyl cyanide rubber under direct tension was successfully obtained,and the typical stress-strain curve of this material at a high strain rate of 240 s~(-1) was calculated. It is proved that the proposed SHTB facility is precise enough to measure the dynamic tensile mechanical properties of the soft material,and it has the advantages of convenient operation and good reproducibility.
To investigate the dynamic tensile properties of soft material with low strength and low wave impedance,an improved SHTB facility was proposed. The specially designed hollow aluminum tubes were used as the incident bar and transmission bar in the proposed facility. Some key affecting issues in the facility were discussed,and the corresponding solutions were presented. A number of cylinder specimens made of butyl cyanide rubber were tested with this improved SHTB facility. The stress wave curve of the butyl cyanide rubber under direct tension was successfully obtained,and the typical stress-strain curve of this material at a high strain rate of 240 s~(-1) was calculated. It is proved that the proposed SHTB facility is precise enough to measure the dynamic tensile mechanical properties of the soft material,and it has the advantages of convenient operation and good reproducibility.
引文
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[2]CHEN Weinong,SONG Bo.Split Hopkinson(Kolsky)bar design,testing,and applications[M].New York:Springer,2011.
[3]HARDING J,WOOD E O,CAMPBELL J D.Tensile testing of materials at impact rates of strain[J].Journal of Mechanical Engineering Science,1960,2(2):88-96.
[4]NICHOLAST T.Tensile testing of materials at high rates of strain[J].Experimental Mechanics,1981,21(5):177-185.
[5]STAAB G H,GILAT A.A direct-tension split Hopkinson bar for high strain rate testing[J].Experimental Mechanics,1991,31(3):232-235.
[6]SONG Bo,CHEN Weinong,GE Yun,et al.Dynamic and quasi-static compressive response of porcine muscle[J].Journal of Biomechanics,2007,40(13):2999-3005.
[7]BACON C.An experimental method for considering dispersion and attenuation in a viscoelastic Hopkinson bar[J].Experimental Mechanics,1998,38(4):242-249.
[8]CHEN W,LU F,FREW D J,et al.Dynamic compression testing of soft materials.ASME Trans J Appl Mech[J].Journal of Applied Mechanics,2002,69(3):214-223.
[9]NIE X,SONG B,GE Y,Dynamic tensile testing of soft materials[J].Experimental Mechanics,2009,49(4):451-458.
[10]SHIM V P,LIU J F,LEE V S.A technique for dynamic tensile testing of human cervical spine ligaments[J].Experimental Mechanics,2006,46(1):77-89.
[11]王宝珍,郑宇轩,胡时胜.猪后腿肌肉的动态拉伸性能[J].爆炸与冲击,2010,30(5):449-455.WANG Baozhen,ZHENG Yuxuan,HU Shisheng,Dynamic tensile properties of porcine ham muscle[J].Explosion and Shock Waves,2010,30(5):449-455.
[12]王礼立.应力波基础[M].2版.北京:国防工业出版社,2005.
[13]YANG L M,SHIM V P W.An analysis of stress uniformity in split Hopkinson bar test specimens[J].International Journal of Impact Engineering,2005,31(2):129-150.