压剪复合加载下聚丙烯屈服行为的实验研究
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摘要
为研究聚丙烯在压剪复合加载下的变形行为和屈服规律,设计了一种压剪复合加载的试件(Shear-Compression Specimen,SCS),分析其构型参数对变形行为的影响,并分别对倾斜角度为5°,15°,30°,45°,60°的SCS进行了准静态加载实验,对SCS压缩变形过程中测量区的压缩应力和剪切应力的演化规律进行了分析。结果发现:聚丙烯在压剪复合加载下屈服规律受静水压影响明显,偏离von-Mises屈服准则;而Hu-Pae屈服准则可较好地描述聚丙烯在不同压剪复合加载条件下的屈服规律。此外,对加载速率影响屈服的规律进行研究,发现聚丙烯在压剪复合加载下的屈服行为具有应变率敏感性。
In order to study the deformation behavior and yield pattern of polypropylene subjected to compression and shear composite loading,a kind of shear-compression specimen(SCS)was designed to analyze the effect of specimen configuration parameters on the deformation behavior.Quasi-static loading experiment of SCS with a tilt angle of 5°/15°/30°/45°/60°was carried out respectively.The evolution of compressive stress and shear stress in SCS measured area during compression and deformation was analyzed.Experimental results show that the yield rule of polypropylene under compression and shear composite loading is obviously influenced by hydrostatic pressure,which deviates from von-Mises yield criterion.While Hu-Pae yield criterion can better describe the yield pattern of polypropylene subjected to different compression and shear composite loading.In addition,the influence of loading rate on yield pattern was also studied.It is found that the yield behavior of polypropylene subjected to compression and shear composite loading is sensitive to strain rate.
In order to study the deformation behavior and yield pattern of polypropylene subjected to compression and shear composite loading,a kind of shear-compression specimen(SCS)was designed to analyze the effect of specimen configuration parameters on the deformation behavior.Quasi-static loading experiment of SCS with a tilt angle of 5°/15°/30°/45°/60°was carried out respectively.The evolution of compressive stress and shear stress in SCS measured area during compression and deformation was analyzed.Experimental results show that the yield rule of polypropylene under compression and shear composite loading is obviously influenced by hydrostatic pressure,which deviates from von-Mises yield criterion.While Hu-Pae yield criterion can better describe the yield pattern of polypropylene subjected to different compression and shear composite loading.In addition,the influence of loading rate on yield pattern was also studied.It is found that the yield behavior of polypropylene subjected to compression and shear composite loading is sensitive to strain rate.
引文
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[11]Zhao J,Knauss W G,Ravichandran G.A new shear-compression-specimen for determining quasistatic and dynamic polymer properties[J].Experimental Mechanics,2009,49(3):427-436.
[12]Alkhader M,Knauss W,Ravichandran G.Experimental arrangement for measuring the high-strain-rate response of polymers under pressures[M].Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials,Springer New York,2011:139-144.
[13]Khan K A,Wafai H,Sayed T E.A variational constitutive framework for the nonlinear viscoelastic response of a dielectric elastomer[J].Computational Mechanics,2013,52(2):345-360.
[14]Vural M,Molinari A,Bhattacharyya N.Analysis of slot orientation in shear-compression specimen(SCS)[J].Experimental Mechanics,2011,51(3):263-273.
[15]Mears D R,Pae K D,Sauer J A.Effects of hydrostatic pressure on the mechanical behavior of polyethylene and polypropylene[J].Journal of Applied Physics,1969,40(11):4229-4237.
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[2]崔云霄,卢芳云,林玉亮,等.一种新的高应变率复合压剪实验技术[J].实验力学,2006,21(5):584-590(CUI Yunxiao,LU Fangyun,LIN Yuliang,et al.A new combined compression-shear loading technique at high strain rates[J].Journal of Experimental Mechanics,2006,21(5):584-590(in Chinese))
[3]郑文,徐松林,蔡超,等.基于Hopkinson压杆的动态压剪复合加载实验研究[J].力学学报,2012,44(1):124-131(ZHENG Wen,XU Songlin,CAI Chao,et al.A study of dynamic combined comperssion-shear loading technique based on Hopkinson pressure bar[J].Chinese Journal of Theoretical and Applied Mechanics,2012,44(1):124-131(in Chinese))
[4]宋卿争.复合应力下NiTi合金力学特性和相变波的研究[D].中国科学技术大学,2014(SONG Qingzheng.Mechanical properities and phase transition waves of niti alloy under combined stresses[D].Univerisity of Science and Technology of China,2014(in Chinese))
[5]Meyer L W,Staskewitsch E,Bublies A.Adiabatic shear failure under biaxial dynamic compression/shearloading[J].Mechanics of Materials,1994,17:203-214.
[6]Andrade U,Meyers M A,Vecchio K S,et al.Dynamic recrystallization in high-strain,high-strain-rate plastic deformation of copper[J].Acta Metallurgica et Materialia,1994,42(9):3183-3195.
[7]Marciniak Z,Kolodziejski J.Assessment of sheet metal failure sensitivity by method of torsioning the rings[C].J.Proc.7th Biennal Congr.of the IDDRG,1972:61-64.
[8]魏志刚,李永池,李剑荣,等.冲击载荷作用下钨合金材料绝热剪切带形成机理[J].金属学报,2000,36(12):1263-1268(WEI Zhigang,LI Yongchi,LI Jianrong,et al.Formation mechanism of adiabatic shear band in tungsten heavy alloys[J].Acta Metallurgical Sinica,2000,36(12):1263-1268(in Chinese))
[9]Rittel D,Lee S,Ravichandran G.A shear-compression specimen for large strain testing[J].Experimental Mechanics,2002,42(1):58-64.
[10]Dorogoy A,Rittel D.Numerical validation of the shear compression specimen.Part I:Quasi-static large strain testing[J].Experimental Mechanics,2005,45(2):167-177.
[11]Zhao J,Knauss W G,Ravichandran G.A new shear-compression-specimen for determining quasistatic and dynamic polymer properties[J].Experimental Mechanics,2009,49(3):427-436.
[12]Alkhader M,Knauss W,Ravichandran G.Experimental arrangement for measuring the high-strain-rate response of polymers under pressures[M].Mechanics of Time-Dependent Materials and Processes in Conventional and Multifunctional Materials,Springer New York,2011:139-144.
[13]Khan K A,Wafai H,Sayed T E.A variational constitutive framework for the nonlinear viscoelastic response of a dielectric elastomer[J].Computational Mechanics,2013,52(2):345-360.
[14]Vural M,Molinari A,Bhattacharyya N.Analysis of slot orientation in shear-compression specimen(SCS)[J].Experimental Mechanics,2011,51(3):263-273.
[15]Mears D R,Pae K D,Sauer J A.Effects of hydrostatic pressure on the mechanical behavior of polyethylene and polypropylene[J].Journal of Applied Physics,1969,40(11):4229-4237.
[16]Silano A A,Pae K D,Sauer J A.Effects of hydrostatic pressure on shear deformation of polymers[J].Journal of Applied Physics,1977,48(10):4076-4084.