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学者姓名：孙国芹
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Abstract ：
Titanium alloy is widely used in aerospace and other fields due to its low density, high specific strength, corrosion resistance, and other advantages. With the development of selective laser melting additive manufacturing technology, it is possible to manufacture triply periodic minimal surface porous structures. The effects of structural parameters on the mechanical properties of a Ti-6Al-4V Diamond (D)-type triply periodic minimal surface structure are studied. According to the characteristics of porous structures, the Gibson Ashby fitting formulas of D structures are modified using the concept of equivalent cross-sectional areas. The influence of cell size and surface thickness on the compressive modulus and strength of a D structure is discussed. Prediction formulas of the mechanical properties based on cell size and surface thickness are established by combining the relative density with the structural parameters. On this basis, the density optimization method is applied to the lightweight design of a rocket-related assembly based on D structure filling. The design results verify the feasibility of a lightweight design based on triply periodic minimal surface structure filling.
Keyword ：
lightweight design lightweight design triply periodic minimal surface structure triply periodic minimal surface structure structural parameters structural parameters mechanical property mechanical property
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| GB/T 7714 | Chen, Xiusi , Sun, Guoqin , Zhu, Jiaqi et al. Influence of Structural Parameters on Mechanical Properties of Triply Periodic Minimal Surface Structure [J]. | METALS , 2023 , 13 (2) . |
| MLA | Chen, Xiusi et al. "Influence of Structural Parameters on Mechanical Properties of Triply Periodic Minimal Surface Structure" . | METALS 13 . 2 (2023) . |
| APA | Chen, Xiusi , Sun, Guoqin , Zhu, Jiaqi , Kang, Wei , Shang, Deguang , Deng, Zhanfeng . Influence of Structural Parameters on Mechanical Properties of Triply Periodic Minimal Surface Structure . | METALS , 2023 , 13 (2) . |
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Abstract ：
In this paper, a new life assessment framework is proposed based on the elastic-viscoplastic modeling and the damage behavior for the structural component under multiaxial nonproportional loading at high temperature. The viscoplastic constitutive model with the ability to capture the non-proportional hardening effect is used to obtain the stress-strain fields, in which a new method based on the rotation of strain axis is proposed to evaluate the notch rotation factor. The damage model, which can comprehensively capture the multiaxial fatigue-oxidationcreep behaviors, is used to assess the failure life. In addition, the proposed framework is evaluated by the life results under proportional and non-proportional fatigue loadings at 650 degrees C, and the errors are found to be within a factor of 2.
Keyword ：
Multiaxial loading Multiaxial loading Elastic-viscoplastic Elastic-viscoplastic Non-proportional hardening Non-proportional hardening Fatigue-oxidation-creep damage Fatigue-oxidation-creep damage Notch Notch
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| GB/T 7714 | Li, Dao-Hang , Shang, De-Guang , Yin, Xiang et al. A novel fatigue-oxidation-creep life prediction method under non-proportional loading [J]. | ENGINEERING FAILURE ANALYSIS , 2022 , 131 . |
| MLA | Li, Dao-Hang et al. "A novel fatigue-oxidation-creep life prediction method under non-proportional loading" . | ENGINEERING FAILURE ANALYSIS 131 (2022) . |
| APA | Li, Dao-Hang , Shang, De-Guang , Yin, Xiang , Li, Ming , Chen, Feng , Sun, Guo-Qin et al. A novel fatigue-oxidation-creep life prediction method under non-proportional loading . | ENGINEERING FAILURE ANALYSIS , 2022 , 131 . |
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Abstract ：
Multiaxial high-cycle fatigue failure criterion and life prediction is important for structural components under complex low stress. A new multiaxial high-cycle fatigue damage parameter based on the plane of maximum shear stress is proposed, which includes the maximum shear stress amplitude, normal stress amplitude and maximum equivalent normal stress. The maximum equivalent normal stress is defined in the form of SWT stress function considering the influence of mean stress. The feasibility of the proposed failure criterion and life prediction model is verified by test data of different materials. The predicted results show that the life prediction error of the proposed fatigue model is basically within three times by comparing with McDiarmid, Matake, Crossland and Papadopoulos fatigue models. © The Author(s) 2022.
Keyword ：
fatigue failure criterion; high cycle; life prediction method; maximum equivalent stress; Multiaxial fatigue fatigue failure criterion; high cycle; life prediction method; maximum equivalent stress; Multiaxial fatigue
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| GB/T 7714 | Wang, Y. , Sun, G.-Q. , Liu, J. et al. Multiaxial high-cycle fatigue failure and life prediction based on critical plane method [J]. | International Journal of Damage Mechanics , 2022 , 31 (8) : 1165-1186 . |
| MLA | Wang, Y. et al. "Multiaxial high-cycle fatigue failure and life prediction based on critical plane method" . | International Journal of Damage Mechanics 31 . 8 (2022) : 1165-1186 . |
| APA | Wang, Y. , Sun, G.-Q. , Liu, J. , Liu, X. , Shang, D. . Multiaxial high-cycle fatigue failure and life prediction based on critical plane method . | International Journal of Damage Mechanics , 2022 , 31 (8) , 1165-1186 . |
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Keyword ：
numerical simulation numerical simulation fatigue crack initiation fatigue crack initiation microstructure microstructure porosity porosity additive materials additive materials
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| GB/T 7714 | Sun, Guoqin , Yu, Huimin , Guo, Yicheng et al. Experimental and crystal plasticity simulation on fatigue crack of wire and arc additively manufactured aluminum alloy [J]. | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES , 2021 , 45 (2) : 620-624 . |
| MLA | Sun, Guoqin et al. "Experimental and crystal plasticity simulation on fatigue crack of wire and arc additively manufactured aluminum alloy" . | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES 45 . 2 (2021) : 620-624 . |
| APA | Sun, Guoqin , Yu, Huimin , Guo, Yicheng , Liu, Xiaodong , Shang, Deguang , Chen, Shujun . Experimental and crystal plasticity simulation on fatigue crack of wire and arc additively manufactured aluminum alloy . | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES , 2021 , 45 (2) , 620-624 . |
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Abstract ：
电弧增材技术具有低成本和效率高的优点,考虑到增材件内部孔隙缺陷,考虑用损伤力学的方法进行分析。本文基于连续损伤力学对铝合金电弧增材件的疲劳行为进行数值模拟,当施加应力幅为300Mpa、应力比为-1的疲劳载荷时,增材件的寿命为410周。
Keyword ：
损伤力学 损伤力学 疲劳 疲劳 电弧增材 电弧增材
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| GB/T 7714 | 于慧敏 , 孙国芹 . 基于连续损伤力学的铝合金电弧增材制造件疲劳模拟 [C] //北京力学会第二十七届学术年会论文集 . 2021 . |
| MLA | 于慧敏 et al. "基于连续损伤力学的铝合金电弧增材制造件疲劳模拟" 北京力学会第二十七届学术年会论文集 . (2021) . |
| APA | 于慧敏 , 孙国芹 . 基于连续损伤力学的铝合金电弧增材制造件疲劳模拟 北京力学会第二十七届学术年会论文集 . (2021) . |
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Abstract ：
以Newman方程为基础,对裂纹应力强度因子进行计算,用断裂力学方法对恒幅加载条件下7075铝合金FSW接头不同应力比和不同应力水平下疲劳寿命进行预测。通过实验结果对比发现,80%以上的预测寿命在2倍因子之内。
Keyword ：
寿命预测 寿命预测 搅拌摩擦焊 搅拌摩擦焊 断裂力学 断裂力学
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| GB/T 7714 | 刘金峰 , 孙国芹 . 基于裂纹闭合的搅拌摩擦焊恒幅疲劳寿命预测 [C] //北京力学会第二十七届学术年会论文集 . 2021 . |
| MLA | 刘金峰 et al. "基于裂纹闭合的搅拌摩擦焊恒幅疲劳寿命预测" 北京力学会第二十七届学术年会论文集 . (2021) . |
| APA | 刘金峰 , 孙国芹 . 基于裂纹闭合的搅拌摩擦焊恒幅疲劳寿命预测 北京力学会第二十七届学术年会论文集 . (2021) . |
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Abstract ：
本文基于ABAQUS软件对铝合金电弧增材件进行多裂纹扩展模拟仿真,随着循环载荷的施加,裂纹的长度在不断加大,实现了多条裂纹扩展并且逐渐聚合成一条主裂纹,随着主裂纹的不断增加,最终导致了试件的断裂。
Keyword ：
模拟仿真 模拟仿真 多裂纹扩展 多裂纹扩展 铝合金电弧增材件 铝合金电弧增材件
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| GB/T 7714 | 王旭 , 孙国芹 . 铝合金电弧增材件多裂纹扩展模拟分析 [C] //北京力学会第二十七届学术年会论文集 . 2021 . |
| MLA | 王旭 et al. "铝合金电弧增材件多裂纹扩展模拟分析" 北京力学会第二十七届学术年会论文集 . (2021) . |
| APA | 王旭 , 孙国芹 . 铝合金电弧增材件多裂纹扩展模拟分析 北京力学会第二十七届学术年会论文集 . (2021) . |
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Abstract ：
多轴疲劳损伤行为和寿命预测研究关系着复杂加载条件下金属结构件的服役安全,一直受到科学和工程领域的重视。总结多轴低周和高周疲劳试验性能测试一般过程和疲劳行为研究,重点论述多轴非比例加载对低周疲劳和高周疲劳行为的影响,受加载路径,加载载荷和材料类型的影响,非比例加载对材料低周疲劳循环硬化行为和疲劳寿命的影响有差异,对低周疲劳和高周疲劳表现的疲劳行为的影响也有差别,作用机理不尽一致。单轴本构关系通过引入非比例度因子、修正循环强度系数或将多轴加载时的应变等效为单轴应变等方式可推广到多轴疲劳领域。基于应力、应变、能量、临界面和临界面应变能密度法的多轴疲劳寿命预测模型在文中做了综述,疲劳损伤参量中包含能量...
Keyword ：
疲劳行为 疲劳行为 寿命预测模型 寿命预测模型 非比例加载 非比例加载 缺口件 缺口件 多轴疲劳 多轴疲劳
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| GB/T 7714 | 孙国芹 , 尚德广 , 王杨 . 金属多轴疲劳行为与寿命预测研究进展 [J]. | 机械工程学报 , 2021 , 57 (16) : 153-172 . |
| MLA | 孙国芹 et al. "金属多轴疲劳行为与寿命预测研究进展" . | 机械工程学报 57 . 16 (2021) : 153-172 . |
| APA | 孙国芹 , 尚德广 , 王杨 . 金属多轴疲劳行为与寿命预测研究进展 . | 机械工程学报 , 2021 , 57 (16) , 153-172 . |
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Abstract ：
In order to study on tensile and fatigue fracture mechanism of friction stir welded (FSW) joints, the tensile and fatigue behavior of FSW joints are studied based on the microstructure and strain distribution. The large plastic deformation and fracture occurred in the thermo-mechanically affected zone (TMAZ) on retreating side in tension tests. High contents of shear texture and small angle grain boundary reduce the tensile mechanical property of TMAZ material. The fatigue weak area for FSW joints is affected by the loading condition. The strain concentration in the welded nugget zone (WNZ) and base material makes the fatigue fracture liable to happen in these areas for the FSW joints under the stress ratios of 0.1 and -0.3. When the fracture occurred in WNZ, the crack initiation mainly occurred in clusters of hardened particles, while when the fracture happened in base material, the crack initiation mainly occurred near the pit. The crack in WNZ propagated in an intergranular pattern and the crack in the other areas extended in a transgranular mode, leading to a higher crack growth rate of WNZ than of other regions.
Keyword ：
fracture location fracture location microstructure microstructure friction stir welding friction stir welding strain concentration strain concentration crack propagation crack propagation
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| GB/T 7714 | Sun, Guoqin , Wei, Xinhai , Shang, Deguang et al. Tensile and Fatigue Analysis Based on Microstructure and Strain Distribution for 7075 Aluminum FSW Joints [J]. | METALS , 2020 , 10 (12) . |
| MLA | Sun, Guoqin et al. "Tensile and Fatigue Analysis Based on Microstructure and Strain Distribution for 7075 Aluminum FSW Joints" . | METALS 10 . 12 (2020) . |
| APA | Sun, Guoqin , Wei, Xinhai , Shang, Deguang , Chen, Shujun , Long, Lianchun , Han, Xiuquan . Tensile and Fatigue Analysis Based on Microstructure and Strain Distribution for 7075 Aluminum FSW Joints . | METALS , 2020 , 10 (12) . |
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Abstract ：
本文对7075铝合金搅拌摩擦焊接接头做了变幅多级加载下的疲劳试验,分别对各加载水平下的试件表面裂纹萌生扩展情况进行了研究,发现在每个不同的加载载荷下,在接头不同区域会萌生出裂纹,而在载荷过渡阶段,在前一载荷水平下相应区域萌生的裂纹扩展或减缓或停滞,转而在另一区域萌生出新的裂纹,并且无论低高还是高低加载,第二级载荷水平下所经历的循环数较恒幅下均有明显提高。
Keyword ：
裂纹扩展 裂纹扩展 搅拌摩擦焊 搅拌摩擦焊 疲劳 疲劳
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| GB/T 7714 | 韩文彪 , 孙国芹 . 变幅多级加载下搅拌摩擦焊接头损伤机理分析 [C] //北京力学会第26届学术年会论文集 . 2020 . |
| MLA | 韩文彪 et al. "变幅多级加载下搅拌摩擦焊接头损伤机理分析" 北京力学会第26届学术年会论文集 . (2020) . |
| APA | 韩文彪 , 孙国芹 . 变幅多级加载下搅拌摩擦焊接头损伤机理分析 北京力学会第26届学术年会论文集 . (2020) . |
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