•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):表示材料的塑性变形特性,描述了材料在屈服点后的应变硬化能力; •热软化指数(Thermal softening exponent):表示材料的热软化特性,描述了材料在高温下变软的能力; •材料常数...
Hill, Johnson-Cook strength models for mild and DP 590 steels, in AIP Conference Proceedings 845 (2006) 775-778.Vedantam, K.; Bajaj, D.; Brar, N.S.; Hill, S. Johnson-Cook strength models for mild and DP 590 steels. AIP Conf. Proc. 2006, 845, 775-778....
strength and the logarithm of strain rate 由图9可知 混凝土的破坏强度在高应变率条 件下比低应变率范围内对应变率更为敏感 尽管图9 的试验数据显示了C30混凝土真实的应变率效应 但其破坏强度的增加并非单由应变率所引起 也包 括了静水压力的影响 为了得到C30混凝土破坏强 度单纯对应变率的依赖性 必须去除静水...
temperaturestresstriaxiality.Thecorrespondingmodelparameterswerecalibratedbasedtestdatafiniteelementsimulation.ThevaliditymodelparametersTaylorimpacttests.Keywords:solidmechanics;mechanicalpropertytest;strengthductility;JohnsonCookconstitutiverelationfailuremodel 近年来,由于军用和民用领域的推动,特别是在911 事件之后,冲击爆炸问题...
Strength model 一个强度模型和数据(关于金属承受大应变、高应变率和高温)已经被提 出[7].尽管本文的焦点是断裂特性,但是这个强度模型的结果对于评价断裂模 型,是非常必要的。 The model for the von Mises tensile flow stress , , is expressed as 流动应力 (1 ) 等效塑性应变(equivalent ...
具体如何输入可以参见 Radioss帮助手册Reference Guide工具书上关于/FAIL/TAB1的例子。 Ranges of stress state attainable by various types of tests [1] 参考: [1] Wierzbicki, Tomasz, "Addendum to the Research Proposal on "Fracture of Advanced High Strength Steels.", page 19, January 2007...
1.According to Johnson-Cook′s strength modelt,he strain rate coefficient and related material constants of C30 concrete subjected to large strains,high strain rates and high pressures are determined experimentally.采用Instron1342液压伺服试验机和改进的SHPB技术对国产C30混凝土进行了应变率在一定宽广范围的一...
The results of this experimental work were used to define a new set of material constants for the strength component of the Johnson-Cook model for 20# steel. 根据材料在不同应变率下的试验结果,拟合了Johnson-Cook模型中的材料常数,并修正了应变率强化系数C,确定了20号钢的Johnson-Cook本构关系。2...
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 ...