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摘要 ：
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.
关键词 ：
Elastic-viscoplastic Elastic-viscoplastic Fatigue-oxidation-creep damage Fatigue-oxidation-creep damage Multiaxial loading Multiaxial loading Non-proportional hardening Non-proportional hardening 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 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
To estimate the multiaxial notch local elastic-plastic strains real timely, an online notch elastic-plastic analytical method is proposed coupling with the modified pseudo stress criterion and Chaboche constitutive model. Moreover, for the Ramberg-Osgood material, the non-proportional cyclic strain hardening can be well considered by the proposed unified online accumulation method of equivalent plastic strain increment. Meanwhile, a rapid and effective simulating algorithm for the proposed online method is provided and verified by the experimental data of TC21 titanium alloy and SAE1070 steel notched specimens. Comparisons show that the simulated results can agree with the measured data quite well under multiaxial irregular loading.
关键词 ：
Chaboche constitutive model Chaboche constitutive model elastic-plastic elastic-plastic multiaxial irregular loading multiaxial irregular loading non-proportional cyclic strain hardening non-proportional cyclic strain hardening notch stress-strain notch stress-strain
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| GB/T 7714 | Xue, Long , Shang, De-Guang , Li, Dao-Hang et al. Unified Elastic-Plastic Analytical Method for Estimating Notch Local Strains in Real Time under Multiaxial Irregular Loading [J]. | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2021 . |
| MLA | Xue, Long et al. "Unified Elastic-Plastic Analytical Method for Estimating Notch Local Strains in Real Time under Multiaxial Irregular Loading" . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE (2021) . |
| APA | Xue, Long , Shang, De-Guang , Li, Dao-Hang , Xia, Yu . Unified Elastic-Plastic Analytical Method for Estimating Notch Local Strains in Real Time under Multiaxial Irregular Loading . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2021 . |
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摘要 ：
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...
关键词 ：
多轴疲劳 多轴疲劳 寿命预测模型 寿命预测模型 疲劳行为 疲劳行为 缺口件 缺口件 非比例加载 非比例加载
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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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摘要 ：
A unified viscoplastic constitutive model coupled with a physically-based damage variable, is proposed to capture the cyclic mechanical behavior and microstructural evolution of the material at elevated temperature. The mechanical strength can be reduced by the decrease in the dislocation density, the coarsening of the martensitic lath and the loss of the martensitic structure under cyclic loading. The proposed physically-based damage variable is driven by the evolutions of dislocation density and martensitic lath width. The good com-parisons with test results mean that the proposed model can reasonably model the cyclic elastic-viscoplastic constitutive behavior of the material at high temperature.
关键词 ：
Cyclic softening Cyclic softening Damage mechanics Damage mechanics Dislocation density Dislocation density High temperature fatigue High temperature fatigue Martensitic lath Martensitic lath
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| GB/T 7714 | Li, Dao-Hang , Li, Ming , Shang, De-Guang et al. Physically-based modeling of cyclic softening and damage behaviors for a martensitic turbine rotor material at elevated temperature [J]. | INTERNATIONAL JOURNAL OF FATIGUE , 2021 , 142 . |
| MLA | Li, Dao-Hang et al. "Physically-based modeling of cyclic softening and damage behaviors for a martensitic turbine rotor material at elevated temperature" . | INTERNATIONAL JOURNAL OF FATIGUE 142 (2021) . |
| APA | Li, Dao-Hang , Li, Ming , Shang, De-Guang , Gupta, Alok , Sun, Wei . Physically-based modeling of cyclic softening and damage behaviors for a martensitic turbine rotor material at elevated temperature . | INTERNATIONAL JOURNAL OF FATIGUE , 2021 , 142 . |
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摘要 ：
The fatigue damage process of SiC coated needled C/SiC composite specimen was monitored by acoustic emission (AE) under tension-tension cyclic loading. By analyzing the collected AE parameters of the composite, it is found that Kaiser effect enhances with the increase of stable cycles in the fatigue process. Moreover, multivariate K-means cluster analysis of AE parameters was carried out after the standardization of energy, amplitude, peak frequency and duration of AE signal. By comparing the objective function values of different number of clusters, and referring to the intra group variance and the variance between groups, the damage modes of the needled C/SiC composite are finally divided into four clusters, and the characteristics of AE parameters with different damage modes can be obtained. Furthermore, by referring to the microstructure characteristics of needled C/SiC composite, various damage modes at different fatigue stages were analyzed. In addition, the fracture morphology of the specimen was also observed by scanning electron microscope after fatigue fracture.
关键词 ：
Acoustic emission Acoustic emission Composite material Composite material Fatigue behavior Fatigue behavior K-means cluster K-means cluster Needled C Needled C SiC SiC
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| GB/T 7714 | Hou, Geng , Shang, De-Guang , Zuo, Lin-Xuan et al. Fatigue damage identification of SiC coated needled C/SiC composite by acoustic emission [J]. | CERAMICS INTERNATIONAL , 2021 , 47 (11) : 15129-15138 . |
| MLA | Hou, Geng et al. "Fatigue damage identification of SiC coated needled C/SiC composite by acoustic emission" . | CERAMICS INTERNATIONAL 47 . 11 (2021) : 15129-15138 . |
| APA | Hou, Geng , Shang, De-Guang , Zuo, Lin-Xuan , Qu, Lin-Feng , Guo, Yi-Er , Xia, Ming et al. Fatigue damage identification of SiC coated needled C/SiC composite by acoustic emission . | CERAMICS INTERNATIONAL , 2021 , 47 (11) , 15129-15138 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In this paper, a method based on the improved effective stress concentration factor is proposed to estimate the local stress–strain for tenon joint structure under multiaxial cyclic loading at non-isothermal high temperature. In order to consider the effect of changing temperature on material properties, the impact caused by temperature on the stress–strain response needs to be introduced to the parameters of material constitutive model. So that, each material parameter in viscoplastic constitutive model is expressed as a function of temperature. In addition, the computing method of the effective stress concentration factor is improved so as to solve the problem of the overestimation for local stress–strain of tenon joint structure in the Neuber rule. Moreover, the proposed notch correction method is coupled with the Chaboche unified viscoplastic constitutive model to estimate the local stress–strain of tenon joint structure at non-isothermal high-temperature condition. To verify the reliability of the proposed method, the calculation results are compared with the nonlinear finite element analysis results under various loading paths at non-isothermal high-temperature condition. The results showed that the proposed method can accurately estimate the notch stress and strain under multiaxial thermo-mechanical cyclic loading. © 2021, ASM International.
关键词 ：
Constitutive models Constitutive models Cyclic loads Cyclic loads Isotherms Isotherms Loading Loading Reliability analysis Reliability analysis Stress analysis Stress analysis Stress concentration Stress concentration Viscoplasticity Viscoplasticity Welds Welds
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| GB/T 7714 | Wang, Ling-Wan , Shang, De-Guang , Li, Dao-Hang et al. Local Stress–Strain Estimation for Tenon Joint Structure under Multiaxial Cyclic Loading at Non-isothermal High Temperature [J]. | Journal of Materials Engineering and Performance , 2021 , 30 (4) : 2720-2731 . |
| MLA | Wang, Ling-Wan et al. "Local Stress–Strain Estimation for Tenon Joint Structure under Multiaxial Cyclic Loading at Non-isothermal High Temperature" . | Journal of Materials Engineering and Performance 30 . 4 (2021) : 2720-2731 . |
| APA | Wang, Ling-Wan , Shang, De-Guang , Li, Dao-Hang , Cui, Jin , Chen, Feng . Local Stress–Strain Estimation for Tenon Joint Structure under Multiaxial Cyclic Loading at Non-isothermal High Temperature . | Journal of Materials Engineering and Performance , 2021 , 30 (4) , 2720-2731 . |
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摘要 ：
现代飞机的高性能导致飞机制造成本日益昂贵,同时对于飞机寿命监控的精确性要求也越来越高,因此飞机结构单机疲劳寿命监控成为世界各国的研究重点.回顾了飞机结构单机疲劳寿命监控技术发展历程、国内外研究现状、相关技术要点,对基于结构健康监测的飞机结构单机疲劳寿命监控技术及其关键问题进行了详细的阐述.同时为适应新时代智能化、自动化的单机寿命监控技术的发展,提出了单机疲劳寿命监控技术未来的发展趋势及面临的挑战.
关键词 ：
在线监测 在线监测 结构健康监测 结构健康监测 智能监控 智能监控 传感器 传感器 飞行参数 飞行参数 单机疲劳寿命 单机疲劳寿命
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| GB/T 7714 | 尚德广 , 夏禹 , 薛龙 et al. 飞机结构单机疲劳寿命监控技术研究综述 [J]. | 北京工业大学学报 , 2020 , 46 (06) : 556-570 . |
| MLA | 尚德广 et al. "飞机结构单机疲劳寿命监控技术研究综述" . | 北京工业大学学报 46 . 06 (2020) : 556-570 . |
| APA | 尚德广 , 夏禹 , 薛龙 , 乔石 , 张强 . 飞机结构单机疲劳寿命监控技术研究综述 . | 北京工业大学学报 , 2020 , 46 (06) , 556-570 . |
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摘要 ：
目的 提出一种综合考虑疲劳强度影响因素的寿命预测方法 .方法利用提出的综合疲劳强度因子Kz考虑应力集中、尺寸和表面状态等因素对疲劳强度的影响,结合S-N曲线方法,采用Goodman方程进行平均应力修正,采用Miner定理进行疲劳损伤累积,提出一种适用于机械结构的疲劳寿命预测方法.结果 对一种复杂结构螺旋弹簧进行了位移控制的恒幅和变幅台架试验,并利用弹塑性有限元分析获得了关键危险点位置的应力响应历程.利用台架试验的寿命结果对提出的方法进行了验证,预测误差在2倍因子以内.结论 提出的方法可以较好地预测机械结构的疲劳寿命.
关键词 ：
寿命预测 寿命预测 弹塑性有限元分析 弹塑性有限元分析 螺旋弹簧 螺旋弹簧
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| GB/T 7714 | 李道航 , 吴学雷 , 万芳 et al. 综合考虑疲劳强度影响因素的寿命预测方法 [J]. | 装备环境工程 , 2020 , 17 (7) : 109-115 . |
| MLA | 李道航 et al. "综合考虑疲劳强度影响因素的寿命预测方法" . | 装备环境工程 17 . 7 (2020) : 109-115 . |
| APA | 李道航 , 吴学雷 , 万芳 , 张军伟 , 李罗金 , 尚德广 . 综合考虑疲劳强度影响因素的寿命预测方法 . | 装备环境工程 , 2020 , 17 (7) , 109-115 . |
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摘要 ：
A real-time multiaxial thermo-mechanical damage evaluation method was proposed under variable amplitude loading. In order to achieve real-time damage evaluation, a real-time multiaxial cycle counting method that can take into account temperature loading history was proposed. The proposed multiaxial cycle counting method can obtain the reversals one by one in order with the reading of the load-time history data, which can realize the damage calculation immediately as a single reversal is counted out. At the same time, to consider the effect of temperature loading on the damage accumulation, an equivalent temperature was determined for the time period of the counted reversal. A fatigue-oxidation-creep damage model that can consider the influence of the non-proportional additional hardening on the fatigue, oxidation and creep damages was used to predict the lives in cases of isothermal axial-torsional fatigue, uniaxial thermo-mechanical fatigue and axial-torsional thermo-mechanical fatigue under constant and variable amplitude loadings. The results showed that the prediction errors were within a factor of 2.
关键词 ：
Cycle counting Cycle counting Life prediction Life prediction Multiaxial thermo-mechanical fatigue Multiaxial thermo-mechanical fatigue Real-time damage evaluation Real-time damage evaluation Variable amplitude loading Variable amplitude loading
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| GB/T 7714 | Li, Dao-Hang , Shang, De-Guang , Xue, Long et al. Real-time damage evaluation method for multiaxial thermo-mechanical fatigue under variable amplitude loading [J]. | ENGINEERING FRACTURE MECHANICS , 2020 , 229 . |
| MLA | Li, Dao-Hang et al. "Real-time damage evaluation method for multiaxial thermo-mechanical fatigue under variable amplitude loading" . | ENGINEERING FRACTURE MECHANICS 229 (2020) . |
| APA | Li, Dao-Hang , Shang, De-Guang , Xue, Long , Barkey, Mark E. , Chen, Hong . Real-time damage evaluation method for multiaxial thermo-mechanical fatigue under variable amplitude loading . | ENGINEERING FRACTURE MECHANICS , 2020 , 229 . |
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摘要 ：
In this paper, a notch stress correction method based on the structural yield surface is proposed, in which the actual stress increment at the notch root can be obtained by multiplying two quantities, that is, the pseudo stress increment and the ratio of the slopes of the material and structural stress-strain curves. In the proposed method, the influence of temperature on the notch stress correction can be taken into account, and no iteration is required during the calculation process. Moreover, based on the proposed notch correction method and a unified viscoplastic constitutive model at high temperature condition, a notch stress-strain estimation method is developed under multiaxial thermo-mechanical cyclic loading. In order to assess the prediction accuracy of the proposed method, the calculated results are correlated to those from thermal-structural non-linear finite element analysis under various proportional and non-proportional mechanical loadings at non-isothermal high temperature condition. The comparison between the calculated and analyzed results shows that the proposed method can precisely estimate the notch stress and strain under multiaxial thermo-mechanical cyclic loading. (C) 2020 Elsevier Ltd. All rights reserved.
关键词 ：
Elastic-viscoplastic Elastic-viscoplastic Multiaxial thermo-mechanical cyclic loading Multiaxial thermo-mechanical cyclic loading Notch correction method Notch correction method Structural yield surface Structural yield surface Thermal-structural finite element analysis Thermal-structural finite element analysis
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| GB/T 7714 | Li, Dao-Hang , Shang, De-Guang , Xue, Long et al. Notch stress-strain estimation method based on pseudo stress correction under multiaxial thermo-mechanical cyclic loading [J]. | INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES , 2020 , 199 : 144-157 . |
| MLA | Li, Dao-Hang et al. "Notch stress-strain estimation method based on pseudo stress correction under multiaxial thermo-mechanical cyclic loading" . | INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES 199 (2020) : 144-157 . |
| APA | Li, Dao-Hang , Shang, De-Guang , Xue, Long , Li, Luo-Jin , Wang, Ling-Wan , Cui, Jin . Notch stress-strain estimation method based on pseudo stress correction under multiaxial thermo-mechanical cyclic loading . | INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES , 2020 , 199 , 144-157 . |
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