经典的Johnson－Cook本构模型不能很好地描述钛合金在高应变率下的力学性能。作者引入S型曲线定量描述β与ε?之间的关系，对经典Johnson－Cook本构模型进行了修正，并采用遗传算法快速确定本构关系中的各个待定参数。最后以Ti－6 Al－4 V合金为例，采用应力增量法作出不同应变率、不同温度下的真应力－真应变曲线。数值模拟结果与文献[7]中的实验数据吻合得很好，表明修正的Johnson－Cook模型能够很好地描述Ti－6Al－4V合金在任意应变率、任意温度下的力学行为，这对预测材料在高应变率和高温下的力学行为具有重要工程意义。
The classical Johnson-Cook model can not well describe the mechanical behavior of titanium alloy under high strain rate .This paper introduced the S-curve to quantitatively describe the relationshi p between the function-heat transfer coefficient βand strain rate ε?, and modified the classical Johnson-Cook constitutive model .The genetic algorithms was used to quickly identify the various parameters in the constitutive model .Finally, by the stress incremental approach , the true stress-true strain curves for Ti-6 Al-4 V alloy under different strain rates and temperatures were carried out.The numerical simulation results and experimental datas in the reference 7th can be a good match , indicating that the modified Johnson-Cook model established in this paper can well describe the mechanical behavior of Ti-6Al-4V alloy under any strain rates and temperatures .It is important to predict the mechani-cal behavior of materials at high strain rate and high temperature .
参考文献
| [1] | 刘旭阳 .TC4钛合金动态本构关系研究[D].南京航空航天大学,2010. |
| [2] | 汤铁钢;刘仓理.高应变率拉伸加载下无氧铜的本构模型[J].爆炸与冲击,2013(6):581-586. |
| [3] | 汤铁钢;李庆忠;陈永涛;谷岩;刘仓理.实现材料高应变率拉伸加载的爆炸膨胀环技术[J].爆炸与冲击,2009(5):546-549. |
| [4] | 汤铁钢;刘仓理.一种新型爆炸膨胀环实验装置[J].实验力学,2013(2):247-254. |
| [5] | 曾祥国;盛鹰;韩悌信;陈军;陈华燕.考虑热粘塑性钛合金动态本构关系及其实验验证[J].四川大学学报（工程科学版）,2014(6):152-157. |
| [6] | Khan AS;Suh YS;Kazmi R.Quasi-static and dynamic loading responses and constitutive modeling of titanium alloys[J].International Journal of Plasticity,200412(12):2233-2248. |
| [7] | 杨扬;曾毅;汪冰峰.基于Johnson-Cook模型的TC16钛合金动态本构关系[J].中国有色金属学报,2008(3):505-510. |
| [8] | 严慧;吕效国.S型曲线自回归模型的自回归分析[J].高等函授学报（自然科学版）,2010(5):95-96,48. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%