超高强度钢Aermet100的试验研究及疲劳寿命预测

IF 0.6 4区 工程技术 Q4 MECHANICS Mechanika Pub Date : 2022-04-15 DOI:10.5755/j02.mech.29302
Enze Zhu, Hu Chen, Xingbo Fang, Hong-Bin Nie
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引用次数: 0

摘要

研究了超高强度钢Aermet100在不同加载速率下的疲劳性能。采用标准试样对Aermet100钢进行了静态力学性能测试,在此基础上得到了缩颈前后试样的基本力学性能和断裂特征。为考虑应变率效应,本研究采用动态本构模型Johnson-Cook。通过动态力学试验和准静态试验拟合了方程参数。然后将该模型输入到ABAQUS用户定义程序中。在上述工作的基础上,结合扩展有限元法(XFEM),建立了基于连续损伤力学的Aermet100钢试件动态断裂有限元模型。在实验室进行了五组试件疲劳试验。仿真结果表明,在相同载荷和边界条件下,所建立的一体化XFEM模型是可行和准确的。实验数据和仿真结果表明,在0.0001 ~ 1s加载时间范围内,寿命周期随着加载速率的增加而增加。值得一提的是,加载时间在0.0001s量级时,寿命变化明显。
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Experimental Research and Fatigue Life Prediction of Ultra-High-Strength Steel Aermet100
This study concentrates on the fatigue performance of ultra-high-strength steel Aermet100 under different loading rates. The standard specimen measured the static mechanical properties of Aermet100 steel, based on which the basic mechanical properties and fracture characteristics of the sample before and after necking was obtained. To take the strain rate effect into account, this study uses the dynamic constitutive model Johnson-Cook. The equation parameters are fitted through dynamic mechanical tests and quasi-static tests. This model is input into ABAQUS user-defined program afterward. Referring to the work done above, along with the extended finite element method (XFEM), this study establishes the dynamic fracture finite element model of the Aermet100 steel specimen on the basis of the continuous damage mechanics. Five groups of specimen fatigue tests were carried out in the laboratory. Simulation results show the feasibility and accuracy of the integrated XFEM model with the same loading and boundary conditions. The experimental data and simulation results prove that, in the loading time range of 0.0001 ~ 1s, the life cycles increase as the loading rate increases. It is worth mentioning that when the loading time is in the order of 0.0001s, the life changes significantly.
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来源期刊
Mechanika
Mechanika 物理-力学
CiteScore
1.30
自引率
0.00%
发文量
50
审稿时长
3 months
期刊介绍: The journal is publishing scientific papers dealing with the following problems: Mechanics of Solid Bodies; Mechanics of Fluids and Gases; Dynamics of Mechanical Systems; Design and Optimization of Mechanical Systems; Mechanical Technologies.
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