Johnson–Cook strength modelJohnson〤ook (JC) high temperature strength material models have been widely used in Finite Element Analysis (FEA) to solve variety of hot rolling problems. In this paper, the temperature and strain rate related parameters of JC model were experimentally calibrated for ...
In this section, a new hardening model is introduced, which is referred to as Split Johnson–Cook (SJC) strength model. Since the new model derives from the classical JC model, it keeps an empirical nature. This aspect is central in order to properly frame the context in which the new mo...
国产C30混凝土考虑率型微损伤演化的改进Johnson-Cook强度模型
JOHNSON-COOK模型由一系列参数来描述材料的本构行为。对于硼钢而言,常用的JOHNSON-COOK参数包括: •杨氏模量(Young’s modulus):表示材料在弹性阶段的刚度,单位为GPa; •屈服强度(Yield strength):表示材料在开始发生塑性变形前所能承受的最大应力,单位为MPa; •塑性应变硬化指数(Strn-hardening exponent):表示材...
Johnson-Cook破坏模型用于描述延性破坏,需要确定三个参数D1, D2 和D3。/FAIL/TAB1破坏模型可以直接输入曲线来描述材料的破坏,引入了另一个描写材料破坏的变量的参数Lode Angle(罗德角)。Lode Angle θ总是在0≤θ≤π/3范围里变化,Lode Angle parameter ξ取值区间为(-1≤ ξ≤1)。用户需要根据实验数据来...
在有限元显式分析中,仿真工程师非常关心单元的破坏效应。在Radioss的失效模型设置中,用户经常会使用到Johnson-Cook破坏模型,用于描述延性破坏。 首先,需要一个变量Stress triaxiality,这个变量可以很好的用于描述延性破坏。 这个变量在Radioss中的许多破坏模型中有用到,如/FAIL/JOHNSON,/FAIL/SPALLING,/FAIL/WIERZBICKI 以...
c yield strength Yn = ( A + B*epsp**n )*hsv(8) c c effective plastic strain increment depsp = max( 0.0, sigtry - Yn ) / 3.0*g c scale = Yn/( sigtry + 1d-8 ) c radial return sij = scale*sij c effective plastic strain update ...
WK Rule, SE Jones A revised form for the Johnson–Cook strength model Int J Impact Eng, 21 (8) (1998), pp. 609-624 View PDFView articleView in ScopusGoogle Scholar [5] YC Lin, XM Chen, G Liu A modified Johnson-Cook model for tensile behaviors of typical high-strength alloy steel ...
Johnson–Cook model Metals Temperature dependence Constitutive parameters Introduction It is well known that metal mechanical performance, such as yield stress, ductility, and strength, are related to loading conditions [1], [2]. Rate and temperature dependences of mechanical properties are believed to...