Johnson-Cook modelIn this study, the parameters of the Johnson-Cook model of SWRH82B steel are determined to describe the dynamic mechanical properties and fracture behaviors of steel wires. A total of 299 specimens are tested to determine the parameters. Quasi-static tensile tests at varying ...
n是无量纲的硬化系数。n的取值决定着材料的塑性流动方向和材料模型:(1)当n=1,材料为理想线弹性材料;(2)当n=0,材料为非线性弹性材料;(3)当0<n<1,材料为弹塑性材料。c 和 m 为无量纲的模型参数,分别关联应变率与热软化效应。T*=(T-Tr)/(Tm-Tr)为无量纲化温度,其中,Tr,Tm分别为参考温度和材料的熔...
[6]JOHNSON G R,COOK W H.A Constitutive Model and Data for Metals Subjected to Large Strains,High Strain Rates and High Temperatures [C]//International Ballistics Society.Proccedings of 7th International Symposium on Ballistics.The Hague:The Nether Lands,1983:541-547. [7]刘再德,王冠,冯银成.60...
DATA ANALYSIS AND MODEL DEVELOPMENT 试验数据用来分析说明各种参数对“应变引起的断裂(the strain to fracture)”的影响。这是通过开发一个累积-损伤断裂模型来实现的,该模型使应变率、温度和压力相互独立。在断裂模型开发出来前,一个强度模型和数据简要的描述一下。 Strength model 一个强度模型和数据(关于金属承受大...
24、ON EEL AS( 6)ZEPL AS( 6),FLOW(6)PARAMETER (ONE=1.ODO,TWO=2.0D0zTHREE=3.0D0,SIX=6.0D0, HALF =0.5d0)DATA NEWTON,TOLER/40,1 .D-6/CCCUMAT FOR JOHNSON-COOK MODELCCPROPS( 1)-YANG'S MODULUSCPROPS(2) - POISSON RATIOCPROPS(3) - INELASTIC HEAT FRACTIONCP ARAMETERS OF JOHNSON-...
DATA ANALYSIS AND MODEL DEVELOPMENT 试验数据用来分析说明各种参数对“应变引起的断裂(the strain to fracture)”的影响。这是通过开发一个累积-损伤断裂模型来实现的,该模型使应变率、温度和压力相互独立。在断裂模型开发出来前,一个强度模型和数据简要的描述一下。 Strength model 一个强度模型和数据(关于金属承受大...
Fracture model 断裂模型的目的是说明各种参数的相关影响(relative effects )。该模型 也试图说明通过累积损伤变形发展的路径依赖(path dependency )。不像许 多复杂的成核-生长(Nucleation and Growth )模型,此处的断裂模型使用了 有限数目的常数,而且该模型主要依赖于应变,应变率,温度和压力。 改进后的断裂模型的...
simulation.The validity of the model parameters was verif ied with Taylor impact tests. Key words:solid mechanics;mechanica l prope~y test;strength and ductility;Johnson—Cook constitutive relation and faill】re model 近年来 ,由于军用 和民用领域 的推动 ,特别是 在 91 1事件之后 ,冲击爆炸问题越来...
of Transportation. Federal Aviation Administration. September, 2000.[2] G. Kay. Failure modeling of titanium 6Al-4V and aluminum 2024-T3 with the Johnson-Cook material model. Tech. Rep. DOT/FAA/AR-03/57. US department of Transportation, Federal Aviation Administration, September, 2003.