SHPB实验考虑绝热变形和端面摩擦的修正方法

俞晓强; 郑百林; 杨彪; 史同承

doi:10.13224/j.cnki.jasp.2018.10.008

SHPB实验考虑绝热变形和端面摩擦的修正方法

doi: 10.13224/j.cnki.jasp.2018.10.008

1.
同济大学航空航天与力学学院,上海 200092
2.
中国航空发动机集团有限公司商用航空发动机有限责任公司设计研发中心,上海 201100

基金项目: 上海市航空发动机领域联合创新计划项目(AR905)

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出版历程
- 收稿日期: 2017-06-22
- 刊出日期: 2018-10-28

Correction method of SHPB experiment considering adiabatic deformation and interfacial friction effects

摘要

摘要: 采用高温分离式霍普金森压杆(SHPB)实验技术对GH4169高温合金进行测试,获得了材料在高应变率下的温度敏感性，并拟合了Johnson-Cook本构模型的参数。结合数值计算方法对压缩实验中试件内部的应力、应变以及温度的分布建立了一个半经验的数学模型并提出了一种新的参数修正方法,将端面摩擦效应、绝热变形升温效应与SHPB实验结果进行解耦。实验结果表明：温度越高，GH4169高温合金的屈服强度以及流动应力越小。并且在SHPB实验中GH4169高温合金存在明显的绝热变形升温效应和端面摩擦效应,导致实验结果并不能真实反映材料的硬化特性。通过对原始Johnson-Cook本构方程的硬化项乘以1.2的修正系数,发现修正后的本构参数准确反映了材料在高应变率下的应力应变特性。
- 端面摩擦 /
- 绝热变形 /
- 分离式霍普金森压杆 /
- 本构模型 /
- GH4169高温合金
Abstract: GH4169 super alloy was tested using high temperature split Hopkinson pressure bar (SHPB) technique. The temperature sensitivity of the material under high strain rates was obtained and the parameters of Johnson-Cook constitutive model were fitted. A semi-empirical model was established to describe the distribution of stress, strain and temperature inside the specimen during compression based on the numerical calculation method. Then a new method for correcting the constitutive parameters was put forward to decouple the interfacial friction effect and adiabatic deformation from the result of SHPB experiment. The experimental results showed that the yield strength and flow stress of GH4169 super alloy decreased with the increase of temperature. And it was confirmed that adiabatic deformation and interfacial friction effect obviously affected the accuracy of SHPB experiment, thus the results can not reflect the work hardening properties of the material. After multiplying the hardening term by the correction factor of 1.2, the modified constitutive parameters accurately reflected the stress-strain characteristics of the material under high strain rates.
- interfacial friction effect /
- adiabatic deformation /
- split Hopkinson pressure bar /
- constitutive model /
- GH4169 super alloy

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参考文献(19)

[1]	胡时胜.霍普金森压杆技术［J］.兵器材料科学与工程,1991(11):40-47.
[2]	KOLSKY H.An investigation of the mechanical properties of materials at very high rates of loading［J］.Proceedings of the Physical Society:B,1949,62(11):676-700.
[3]	KOLSKY H.Stress waves in solids［M］.North Chelmsfordv,US:Courier Corporation,1963.
[4]	MESCALL J,PAPIRNO R,MCLAUGHLIN J.Stress and deformation states associated with upset tests in metals［M］∥CHAIT R,PAPIRNO R.Compression Testing of Homogeneous Materials and Composites.West Conshohocken,US:American Society for Testing and Materials,1983:7-23.
[5]	CHEN F K,CHEN C J.On the nonuniform deformation of the cylinder compression test［J］.Journal of Engineering Materials and Technology,2000,122(2):192-197.
[6]	AL-CHALABI M,MCCORMICK F J,HUANG C L.Strain distribution within compressed circular cylinders［J］.Experimental Mechanics,1974,14(12):497-501.
[7]	BELL J F.An experimental diffraction grating study of the quasi-static hypothesis of the split Hopkinson bar experiment［J］.Journal of the Mechanics and Physics of Solids,1966,14(6):309-327.
[8]	BERTHOLF L D,KARNES C H.Two-dimensional analysis of the split Hopkinson pressure bar system［J］.Journal of the Mechanics and Physics of Solids,1975,23(1):1-19.
[9]	MALINOWSKI J Z,KLEPACZKO J R.A unified analytic and numerical approach to specimen behaviour in the split-Hopkinson pressure bar［J］.International Journal of Mechanical Sciences,1986,28(6):381-391.
[10]	KLEPACZKO J,MALINOWSKI Z.Dynamic frictional effects as measured from the split Hopkinson pressure bar［M］∥KAWATA K,SHIOIRI J.High Velocity Deformation of Solids.Berlin:Springer Berlin Heidelberg,1979:403-416.
[11]	李萍,段园培,张青,等.基于摩擦修正的TB8合金热压缩流变应力行为分析［J］.稀有金属,2009,33(2):137-141.LI Ping,DUAN Yuanpei,ZHANG Qing,et al.Flow stress behavior of TB8 alloy under hot compression deformation based on friction correction［J］.Chinese Journal of Rare Metals,2009,33(2):137-141.(in Chinese)
[12]	张银喜,张军,黄文,等.纯钛高应变率拉伸力学行为的实验研究［J］.材料工程,2011(12):6-9.ZHANG Yinxi,ZHANG Jun,HUANG Wen,et al.Experimental study on tension behavior of pure titanium at high strain rates［J］.Journal of Materials Engineering,2011(12):6-9.(in Chinese)
[13]	KAPOOR R,NEMAT-NASSER S.Determination of temperature rise during high strain rate deformation［J］.Mechanics of Materials,1998,27(1):1-12.
[14]	MASON J J,ROSAKIS A J,RAVICHANDRAN G.On the strain and strain rate dependence of the fraction of plastic work converted to heat:an experimental study using high speed infrared detectors and the Kolsky bar［J］.Mechanics of Materials,1994,17(2/3):135-145.
[15]	NEMAT-NASSER S.Hopkinson techniques for dynamic recovery experiments［J］.Proceedings of the Royal Society A,1991,435(1894):371-391.
[16]	李玉龙,索涛,郭伟国,等.确定材料在高温高应变率下动态性能的Hopkinson 杆系统［J］.爆炸与冲击,2005,25(6):487-492.LI Yulong,SUO Tao,GUO Weiguo,et al.Determination of dynamic behavior of materials at elevated temperature and high strain rates using Hopkinson bar［J］.Explosion and Shock Waves,2005,25(6):487-492.(in Chinese)
[17]	JOHNSON G R,COOK W H.A constitutive model and data for metals subjected to large strains,high strain rates and high temperatures［C］∥Proceedings of the 7th International Symposium on Ballistics.Arlington,US:National Defense Industrial Association,1983:541-547.
[18]	王晓燕.分离式霍普金森压杆实验端面摩擦效应研究［D］.长沙:国防科学技术大学,2004.WANG Xiaoyan.A study of effects os interfacial friction in the split Hopkinson pressure bar tests［D］.Changsha:National University of Defense Technology,2004.(in Chinese)
[19]	EBRAHIMI R,NAJAFIZADEh A.A new method for evaluation of friction in bulk metal forming［J］.Journal of Materials Processing Technology,2004,152(2):136-143.