Comparison of Methods for High-Pressure Dynamic Yield Strength Measurement
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摘要: 对Asay-Chhabildas(AC)方法、横向应力计方法、压-剪方法和X射线衍射方法等4种高压动态屈服强度测量方法进行了比较,根据应变率的异同,将强度数据分为两类进行比较:X射线衍射方法和压-剪方法获得的强度与AC方法获得的强度Y=2c进行比较,而横向应力计方法测得的屈服强度与AC方法中的Y=2H进行比较。通过铝及其合金屈服强度数据的比较分析表明,AC方法、X射线衍射法和压-剪方法测得的强度数据基本一致,但横向应力计法测得的强度远高于AC方法测得的结果(Y=2H),甚至高于其它3种方法测得的结果(Y=2c)。造成横向应力计方法测量结果异常的原因有待进一步研究。与实验数据的比较表明,Steinberg-Cochran-Guinan(SCG)模型过于依赖初始屈服强度,从而导致无法完全反映高压下材料的强度特性,模型有待进一步改进。
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关键词:
- 高压屈服强度 /
- Asay-Chhabildas(AC)方法 /
- 横向应力计方法 /
- 压-剪方法 /
- X射线衍射方法 /
- Steinberg-Cochran-Guinan(SCG)模型
Abstract: The four widely used methods to measure the high-pressure dynamic yield strength of solids, including Asay-Chhabildas (AC) method, lateral stress gauge (LSG) method, pressure-shear (PS) method, and X-ray diffraction (XRD) method, were analyzed in the present work. According to the difference of instant strain rate, the yield strengths defined by different methods hereinbefore are divided into two types: one is with high strain-rate, including the data from PS, XRD, as well as Y=Y=2c from AC method; the another is with zero strain-rate, including the data from LSG, and Y=Y=2H from AC method. The yield strengths of various aluminum and its alloys from publications were compared. Results show that the data from PS, XRD, and Y=Y=2c from AC method are approximately consistent, the data from LSG method, however, are obviously higher than the Y=Y=2H from AC method, and even higher than the data with high instant strain-rate. Further work is needed to determine the cause of the abnormal data from LSG method. Results also show that the Steinberg-Cochran-Guinan (SCG) model is strongly affected by the initial yield strength of materials, and a modified model is needed to describe the behavior of yield strength under high pressure or stress. -
Fowles G R. Shock wave compression of hardened and annealed 2024 aluminum [J]. J Appl Phys, 1961, 32(8): 1475-1487. Asay J R, Chhabildas L C. Determination of the shear strength of shock compressed 6061-T6 aluminum [C]//Meyers M M, Murr L E. Shock Waves and High-Strain-Rate Phenomena in Metals. New York: Plenum Publishing Corp, 1981: 417-431. Rosenberg Z, Partom Y, Yaziv D. The use of in-material stress gauges for estimating the dynamic yield strength of shock-loaded solids [J], J Appl Phys, 1984, 56(1): 143-146. Clifton R J, Klopp R W. Pressure-shear plate impact testing [C]//Metals Handbook: Mechanical Testing. OH, USA: American Society for Metals, 1985: 230-239. Turneaure S J, Gupta Y M. Material strength in shock compressed state using x-ray diffraction measurements [J]. J Appl Phys, 2011, 109(12): 123510. Vogler T J, Chhabildas L C. Strength behavior of materials at high pressures [J]. Int J Impact Eng, 2006, 33: 812-825. Millett J C F, Bourne N K, Chu M Q, et al. The role of aging on the mechanical and microstructural response [J]. J Appl Phys, 2010, 108(7): 073502. Yadav S, Chichili D R, Ramesh K T. The mechanical response of a 6061-T6 A1/Al2O3 metal matrix composite at high rates of deformation [J]. Acta Metal Mater, 1995, 43(12): 4453-4464. Alexander C S, Asay J R, Haill T A. Magnetically applied pressure- shear: A new method for direct measurement of strength at high pressure [J]. J Appl Phys, 2010, 108(12): 126101. Huang H, Asay J R. Compressive strength measurements in aluminum for shock compression of the stress range of 4-22 GPa [J]. J Appl Phys 2005, 98(3): 033524. Huang H, Asay J R. Reshock and release response of aluminum single crystal [J]. J Appl Phys, 2007, 101(6): 063550. Asay J R, Lipkin J. A self-consistent technique for estimating the dynamic yield strength of a shock-loaded material [J]. J Appl Phys, 1978, 49(7): 4242-4247. Steinberg D J, Cochran S G, Guinan M W. A constitutive model for metals applicable at high-strain rate [J]. J Appl Phys, 1980, 51(3): 1496-1504. Grunschel S E, Clifton R J. Pressure-shear plate impact of aluminum at elevated temperatures [C]//Elert M L, Furnish M D, Chau R, et al. Shock Compression of Condensed Matter-2007. New York: AIP, 2008: 529-532. Casem D T, Dandekar D P. Shock and mechanical response of 2139-T8 aluminum [J]. J Appl Phys, 2012, 111(6): 06358. Gupta Y M, Winey J M, Trivedi P B, et al. Large elastic wave amplitude and attenuation in shocked pure aluminum [J]. J Appl Phys, 2009, 105(3): 036107. Appleby-Thomas G J, Hazell P J, Wood D C, et al. On the effects of lateral gauge misalignment in shocked targets [J]. Rev Sci Instrum, 2012, 83(6): 063904.
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