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摘要: 基于对层裂问题的理解和相关文献,就自由面速度剖面解读层裂问题的局限性提出了一些看法。指出:自由面速度剖面测量给出的层裂破坏过程是间接信息,而不是直接信息,用它确定的理论模型和数值模拟参数,也许并没有真实地反映层裂过程的物理本质;层裂强度常被人们用来表征材料在高应变率下的抗拉伸能力,但是在目前的层裂强度计算公式中没有考虑损伤介质对波剖面传播的影响,使得计算结果明显偏低;传统的单点测量得到的结果有很大的局限性,对于层裂问题,采用概率评估或者置信度评估,也许更符合真实情况。建议:为了全面真实地评价层裂问题中的物理、力学过程,应该加快发展更多的实验探测和诊断技术,尤其是对内部损伤状态的观测。Abstract: A few questions on the spallation behavior resolved by the measurement of free-surface velocity profile have been discussed. Firstly, the way from the measured free-surface velocity profile to infer the dynamic damage behavior of the target is an Inverse Problem and the theoretical model and simulation parameters determined by such a solution maybe not represent the real physical nature of spall fracture inside the target. Secondly, how to calculate the spall strength? Due to the attenuation effect of micro-voids or damage on the wave propagation, the spall strength computed from the free-surface velocity profile is apparently lower than the tensile strength suffered by the shocked material. Thirdly, limitation of the traditional single-point measurement on the free-surface velocity profile is briefly reviewed. Given that the shocked target is inhomogeneous, the amplitude of the measured velocity profile is varied from point to point. According to these discussions, future research suggestions have been proposed in order to clearly understand the spallation behavior.
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Key words:
- spall /
- damage /
- free-surface velocity profile
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Meyers M A, Aimone C T. Dynamic Fracture (Spalling) of Metals [J]. Progress in Materials Science, 1983, 28: 1-96. Curran D R, Seaman L, Shockey D A. Dynamic Failure of Solid [J]. Phys Rep, 1987, 147(56): 253-388. Rinehart J S. Some Quantitative Data Bearing on the Scabbing of Metals under Explosive Attack [J]. J Appl Phys, 1951, 22: 555. Bread B R, Mader C L, Venable D. Technique for the Determination of Dynamic-Tensile-Strength Characteristics [J]. J Appl Phys, 1967, 38(8): 3271-3275. Tuler F R, Butcher B M. A Criterion for the Time Dependence of Dynamic Fracture [J]. Int J Fract Mech, 1968, 4(4): 431-437. Davison L, Stevens A L. Continuum Measures of Spall Damage [J]. J Appl Phys, 1972, 43(3): 988-994. Bai Y, Han W, Bai J. A Statistical Evolution Equation of Micro-Damage and Its Application [A]//McDowell D L. Applications of Continuum Damage Mechanics to Fatigue and Fracture, ASTM STP 1315 [C].American Society for Testing and Materials, 1997: 150-162. Bai J, Xia M F, Ke F J. Properties of the Statistical Damage Evolution Equation and Its Numerical Simulation [J]. Chinese Journal of Theoretical and Applied Mechanics, 1999, 31(1): 38-48. (in Chinese) 白洁, 夏蒙棼, 柯孚久, 等. 损伤统计演化方程的性质和数值模拟 [J]. 力学学报, 1999, 31(1): 38-48. Strachan A, Cagin T, Goddard W A Ⅲ. Critical Behavior in Spallation Failure of Metals [J]. Phys Rev B, 2001, 63: 060103. Seppala E T, Belak J, Rudd R E. Onset of Void Coalescence during Dynamic Fracture of Ductile Metals [J]. Phys Rev Lett, 2004, 93: 245503. Seppala E T, Belak J, Rudd R E. Effect of Stress Triaxiality on Void Growth in Dynamic Fracture of Metals: A Molecular Dynamic Study [J]. Phys Rev B, 2004, 69: 134101. Wang Y G, He H L, Wang L L, et al. Time-Resolved Dynamic Tensile Spallation of Pure Aluminum under Laser Irradiation [J]. J Appl Phys, 2006, 100: 033511. Wang Y G. Dynamic Tensile Spall of Ductile Metal and Its Critical Damage Evolution Model [D]. Mianyang: CAEP, 2006. (in Chinese) 王永刚. 延性金属动态拉伸断裂及其临界损伤度研究 [D]. 绵阳: 中国工程物理研究院, 2006. Holtkamp D B, Clark D A, Ferm E N, et al. A Survey of High Explosive-Induced Damage and Spall in Selected Metals Using Proton Radiography [A]//Furnish M D, Gupta Y M, Forbes J W. Shock Compression of Condensed Matter-2003 [C]. New York: Melville, 2004: 477-482. Anderson W W, Cverna F, Hixson R S, et al. Phase Transition and Spall Behavior in -Tin [A]//Shock Compression of Condensed Matter-1999 [C]. New York: Melville, 2000: 443-446. Bontaz-Carion J, Pellegrini Y P. X-Ray Microtomography Analysis of Dynamic Damage in Tantanlun [J]. Advanced Engineering Materials, 2006, 8(6): 480-486. Grady D. Scattering as a Mechanism for Structured Shock Waves in Metals [J]. J Mech Phys Solids, 1998, 46(10): 2017-2032. Sun J S, Zhu J S, Jia X R. An Analysis of Compaction Wave in Granular Material [J]. Chinese Journal of Theoretical and Applied Mechanics, 1999, 31(4): 423-433. (in Chinese) 孙锦山, 朱建士, 贾祥瑞. 颗粒材料中致密波结构研究 [J]. 力学学报, 1999, 31(4): 423-433. Novikov S A. Spall Strength of Materials under Shock Load [J]. J Appl Mech Tech Phys, 1967, 3: 109-123. (in Russian) Stepanov G V, Romanchenko V I, Astanin V V. Experimental Determination of Failure Stresses under Spallation in Elastic-Plastic Waves [J]. Probl Strength, 1977, 8: 96-120. (in Russian) Romanchenko V I, Stepanov G V. The Dependence of Critical Stress upon the Time Parameters of Load at Spalling in Copper, Aluminum, and Steel [J]. J Appl Mech Tech Phys, 1980, 21(4): 141-157. (in Russian) Pei X Y. Two Dimensional Numerical Simulation of Dynamic Spallation of Steel Plate under Impact and Cylinder under Implosion with Damage Function Model [D]. Mianyang: CAEP, 2005. (in Chinese) 裴晓阳. 损伤度函数模型用于碰撞和内爆加载下钢层裂的二维数值模拟研究 [D]. 绵阳: 中国工程物理研究院, 2005. Qi M L. Critical Behavior in Dynamic Tensile Fracture of High Purity Aluminum [D]. Wuhan: Wuhan University of Technology, 2007. (in Chinese) 祁美兰. 高纯铝拉伸型动态破坏的临界行为研究 [D]. 武汉: 武汉理工大学, 2007. Liu C L, Ahrens J A. Stress Wave Attenuation in Shock-Damaged Rock [J]. J Geophys Res, 1997, 102(B3): 5243-5250. Chhabildas L C, Trott W M, Reinhart W D, et al. Incipient Spall Studies in Tantalum Microstructural Effects [A]//Furnish M D, Thadhani N N, Horie Y. Shock Compression of Condensed Matter-2001 [C]. New York: Melville, 2002: 483-486. Hanson K M, Hemez F M. Uncertainty Quantification of Simulation Codes Based on Experimental Data [R]. LA-UR-03-0171, 2003. McCluskey C W, Wilke M D, Anderson W W, et al. Asay Window: A New Spall Diagnostic [J]. Rev Sci Instrum, 2006, 77: 113902. Hixson R S, Vorthman J E, Zurek A K, et al. Spall Response of U-Nb(6%) Alloy [A]//Shock Compression of Condensed Matter-1999 [C]. New York: Melville, 2000: 489-492.
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