| 摘要: |
| 文中从TC4焊接结构在船舶舰艇领域的使用特性出发,根据第四强度理论对现有的连续非线性损伤模型进行修正,提出更符合工程实际的非线性损伤模型,并根据疲劳试验数据测算出其模型参数.然后通过疲劳卸载试样SEM观察分析,验证所修正的损伤模型.再通过非线性损伤修正模型和线性损伤模型及试验数据的对比.结果表明,线性损伤模型在中小载荷下的寿命相对保守,而非线性损伤模型则更接近试验值,证明了修正模型的工程应用价值. |
| 关键词: 钛合金焊接结构 疲劳寿命 非线性损伤 模型修正 |
| DOI： |
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| Non-linear continuum fatigue damage model of TC4 titanium alloy welded joints |
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LIN Youzhi1, FU Gaosheng1,2, LI Lei3, CHEN Jianhong3
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1.Machine and Electronics Engineering Department, Ningde Vocational and Technical College, Ningde 355000, China;2.School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350002, China;3.State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China
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| Abstract: |
| Based on the mechanical characteristics of TC4 titanium alloy welded joints applied in ships and naval vessels etc,this paper modified the existing non-linear continuum damage model according to the fourth strength theory,and proposed a new non-linear continuum damage model that was better in conformity with engineering practice. The model parameters were estimated according to the fatigue experimental data. Then the correctness of the modified damage model was carried out according to the observation and analysis of the fatigue-unloaded specimens by SEM. By comparing the modified non-linear damage model, the linear damage model and experimental data,the results show that the linear damage model was relatively conservative in estimating the fatigue life with medium or low load,but the modified non-linear damage model had higher accuracy and agreed well with the experimental data. |
| Key words: titanium alloy welded joint fatigue life non-linear damage model modifying |
