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学者姓名：尚德广
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Abstract ：
This paper presents a thermo-mechanical fatigue (TMF) life prediction method for titanium alloy TA15 under multiaxial random amplitude loading. Through strain-controlled TMF tests, it was found that under full-reversed cyclic loading, there was a significant presence of mean stress in the stress response. The induced mean stress led to the anomalous phenomenon where the fatigue life of thermal phase angle out-of-phase (TOP) was shorter than that of thermal phase angle in-phase (TIP). Therefore, a new damage calculation model was proposed, which can take into account the pure fatigue damage considering mean stress conversion and the cumulative environmental damage. Uniaxial TMF tests, constant amplitude multiaxial TMF tests, and random amplitude multiaxial TMF tests are conducted to verify the proposed method. The predicted results for all types of tests are in a good agreement with the experimental data.
Keyword ：
Life prediction Life prediction Multiaxial random loading Multiaxial random loading Mean stress Mean stress Thermo-mechanical fatigue Thermo-mechanical fatigue Titanium alloy Titanium alloy
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| GB/T 7714 | Wang, Jin-Jie , Shang, De-Guang , Li, Wen-Long et al. Fatigue life prediction considering conversion of mean stress for titanium alloy under multiaxial thermo-mechanical random loading [J]. | INTERNATIONAL JOURNAL OF FATIGUE , 2024 , 188 . |
| MLA | Wang, Jin-Jie et al. "Fatigue life prediction considering conversion of mean stress for titanium alloy under multiaxial thermo-mechanical random loading" . | INTERNATIONAL JOURNAL OF FATIGUE 188 (2024) . |
| APA | Wang, Jin-Jie , Shang, De-Guang , Li, Wen-Long , Li, Wei , Qian, Cheng , Wu, Shao-Dong . Fatigue life prediction considering conversion of mean stress for titanium alloy under multiaxial thermo-mechanical random loading . | INTERNATIONAL JOURNAL OF FATIGUE , 2024 , 188 . |
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Abstract ：
Fatigue failure mechanism of Ti60 titanium alloy under tension-torsion multiaxial loading in the very high cycle regime was studied first, and the results showed that the shear/axial stress ratio directly affects the failure mechanism. When the shear/axial stress ratio is relatively small, cracks tend to originate from the subsurface in single-point initiation mode, and the larger the shear/axial stress ratio, the more cracks tend to originate from the surface in multi-point initiation mode. Then, a pragmatic equivalent method for multiaxial to uniaxial load based on the law of shear/axial stress ratio on fatigue strength was proposed. Based on this method and uniaxial S-N curve, the fatigue lives of Ti60 specimens under shear/axial stress ratios of 1.37, 1.95, and 3.53 was predicted, and the experimental results showed that the prediction error is basically within a factor of 3.
Keyword ：
Titanium alloy Titanium alloy Life prediction Life prediction Very high cycle fatigue Very high cycle fatigue Failure mechanism Failure mechanism Multiaxial fatigue Multiaxial fatigue
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| GB/T 7714 | Chen, Chao -Lin , Shang, De-Guang , Xiao, Na-Min et al. Multiaxial fatigue life prediction based on effective factor with shear/axial stress ratio for Ti60 titanium alloy in very high cycle regime [J]. | INTERNATIONAL JOURNAL OF FATIGUE , 2024 , 184 . |
| MLA | Chen, Chao -Lin et al. "Multiaxial fatigue life prediction based on effective factor with shear/axial stress ratio for Ti60 titanium alloy in very high cycle regime" . | INTERNATIONAL JOURNAL OF FATIGUE 184 (2024) . |
| APA | Chen, Chao -Lin , Shang, De-Guang , Xiao, Na-Min , Li, Xing -Wu , Sha, Ai-Xue , Li, Jing et al. Multiaxial fatigue life prediction based on effective factor with shear/axial stress ratio for Ti60 titanium alloy in very high cycle regime . | INTERNATIONAL JOURNAL OF FATIGUE , 2024 , 184 . |
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Abstract ：
The fatigue performance and microstructure of polycrystalline copper treated by one (UUV1), two (UUV2), three (UUV3) passes of unconstraint ultrasonic vibration (UUV) treatment were investigated in this paper. The surface roughness, fatigue life, microstructure, and plastic strain energy before and after UUV treatment were compared. The results revealed that the surface integrity of the sample for UUV treatment higher than that of the original sample, and the microscope observation found that the grain orientation, the dislocation density, the low angle grain boundaries, the plastic strain energy of the damaged sample restored to the original state to a great extent after UUV treatment. The fatigue crack initiation life increased by 3 times after UUV3 treatment.
Keyword ：
Fatigue life Fatigue life Molecular dynamics simulation Molecular dynamics simulation LAGBs LAGBs Plastic strain energy Plastic strain energy Unconstraint ultrasonic vibration Unconstraint ultrasonic vibration
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| GB/T 7714 | Guo, Yi-Er , Shang, De-Guang , Xue, Long et al. Damage healing mechanisms in polycrystalline copper under unconstraint ultrasonic vibration treatment [J]. | INTERNATIONAL JOURNAL OF FATIGUE , 2024 , 185 . |
| MLA | Guo, Yi-Er et al. "Damage healing mechanisms in polycrystalline copper under unconstraint ultrasonic vibration treatment" . | INTERNATIONAL JOURNAL OF FATIGUE 185 (2024) . |
| APA | Guo, Yi-Er , Shang, De-Guang , Xue, Long , Yin, Xiang , Chen, Chao-Lin , Li, Dao-Hang . Damage healing mechanisms in polycrystalline copper under unconstraint ultrasonic vibration treatment . | INTERNATIONAL JOURNAL OF FATIGUE , 2024 , 185 . |
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Abstract ：
A multiaxial cycle counting method was proposed by path-dependent line integral (PDLI). In the proposed PDLI multiaxial cycle counting method, the length increment of loading path is assigned a positive or negative sign in the strain space, and the interval from zero to the maximum value of PDLI is defined as a half-cycle. A very concise recursive algorithm is provided to implement the proposed multiaxial cycle counting method. The experimental verification showed that the proposed multiaxal cycle counting method was used to count multi-axial cycle, which can obtain satisfactory life prediction results under multiaxial variable amplitude loading. In addition, the PDLI multiaxial cycle counting method can be reduced to a uniaxial rainflow counting form.
Keyword ：
Variable amplitude loading Variable amplitude loading Life prediction Life prediction Multiaxial fatigue Multiaxial fatigue Cycle counting Cycle counting Path -dependent line integral Path -dependent line integral
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| GB/T 7714 | Yin, Xiang , Shang, De-Guang , Li, Dao-Hang et al. Multiaxial cycle counting method based on path-dependent line integral [J]. | INTERNATIONAL JOURNAL OF FATIGUE , 2024 , 178 . |
| MLA | Yin, Xiang et al. "Multiaxial cycle counting method based on path-dependent line integral" . | INTERNATIONAL JOURNAL OF FATIGUE 178 (2024) . |
| APA | Yin, Xiang , Shang, De-Guang , Li, Dao-Hang , Zhang, Gang , Zhang, Hang , Zhou, Shuai et al. Multiaxial cycle counting method based on path-dependent line integral . | INTERNATIONAL JOURNAL OF FATIGUE , 2024 , 178 . |
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Abstract ：
The fatigue experiments for titanium alloy Ti60 under different uniaxial/multiaxial thermo-mechanical loading modes found that the combined action of high temperature and tensile stress can cause the debonding of the second phase strengthening particles between grain boundary, reducing the ability to resist deformation of Ti60, which leads to a decrease in the fatigue life of the material. In addition, mean tensile stress increases the ability of cracks to break through intergranular barriers and the non-proportional additional hardening caused by multiaxial loading exacerbates the formation of microcracks. Both will increase the fatigue damage of the material. The fatigue damage mechanism identified in this investigation can reasonably explain the fatigue life law under multiaxial loading at high temperature, uniaxial and multiaxial thermo-mechanical fatigue loadings.
Keyword ：
Thermo-mechanical Fatigue Loading Thermo-mechanical Fatigue Loading Multiaxial Fatigue Loading Multiaxial Fatigue Loading Titanium Alloy Titanium Alloy Dislocation Dislocation High Temperature High Temperature Phase Shift Phase Shift
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| GB/T 7714 | Mao, Zheng-Yu , Shang, De-Guang , Li, Dao-Hang et al. Damage mechanisms of Ti60 under different uniaxial/multiaxial thermo-mechanical loading modes [J]. | INTERNATIONAL JOURNAL OF FATIGUE , 2024 , 191 . |
| MLA | Mao, Zheng-Yu et al. "Damage mechanisms of Ti60 under different uniaxial/multiaxial thermo-mechanical loading modes" . | INTERNATIONAL JOURNAL OF FATIGUE 191 (2024) . |
| APA | Mao, Zheng-Yu , Shang, De-Guang , Li, Dao-Hang , Xiao, Na-Min , Sha, Ai-Xue , Li, Jing-Xuan et al. Damage mechanisms of Ti60 under different uniaxial/multiaxial thermo-mechanical loading modes . | INTERNATIONAL JOURNAL OF FATIGUE , 2024 , 191 . |
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Abstract ：
In this paper, a fatigue-creep damage model that can take into account the interaction of fatigue and creep damage is proposed under high temperature cyclic loading. In the proposed model, the effect of temperature on creep damage, the variation of creep damage under different high temperature cyclic loading conditions, and fatigue-creep interaction damage are considered. In addition, in order to accurately describe the creep behavior of unidirectional laminates with different orientations, the damage mechanism of unidirectional laminates was also analyzed. The creep and fatigue test results at different temperatures showed that the proposed creep rupture time model and the fatigue-creep damage model considering the damage mechanisms can successfully predict the creep and fatigue lives of unidirectional laminates at high temperature, and the prediction results are in good agreement with the experimental data.
Keyword ：
Composite laminates Composite laminates Fatigue life prediction Fatigue life prediction Creep damage Creep damage Elevated temperature Elevated temperature Fatigue damage Fatigue damage
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| GB/T 7714 | Guo, Yi-Er , Shang, De-Guang , Zuo, Lin-Xuan et al. Fatigue-creep damage model for carbon fibre reinforced composites under high temperature cyclic loading [J]. | COMPOSITES SCIENCE AND TECHNOLOGY , 2024 , 258 . |
| MLA | Guo, Yi-Er et al. "Fatigue-creep damage model for carbon fibre reinforced composites under high temperature cyclic loading" . | COMPOSITES SCIENCE AND TECHNOLOGY 258 (2024) . |
| APA | Guo, Yi-Er , Shang, De-Guang , Zuo, Lin-Xuan , Qu, Lin-Feng , Chen, Chao-Lin . Fatigue-creep damage model for carbon fibre reinforced composites under high temperature cyclic loading . | COMPOSITES SCIENCE AND TECHNOLOGY , 2024 , 258 . |
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Abstract ：
An applied approach for predicting the fatigue life of the through-hole for needled ceramic matrix composite was proposed by using the 0 degrees layers volume fraction and the fatigue notch factor, which can be applicable for the needled composite with different lamination types. In the proposed approach, the fatigue limit and stress-life (S-N) curve of the needled ceramic matrix composite with different 0 degrees layer volume fractions were estimated by interpolation method first. On this basis, combined with the fatigue notch factor determined by the smooth and through-hole specimens with arbitrary 0 degrees layer volume fraction, the fatigue life of the through-hole can be predicted. By comparing the predicted lives with the experimental lives, the proposed fatigue life prediction approach has high prediction accuracy.
Keyword ：
Fatigue life prediction Fatigue life prediction Ceramic matrix composite Ceramic matrix composite Volume fraction Volume fraction Through-hole Through-hole Needled C/SiC Needled C/SiC
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| GB/T 7714 | Hou, Geng , Shang, De-Guang , Zuo, Lin-Xuan et al. Fatigue life prediction approach for through-hole of needled ceramic matrix composite based on volume fraction [J]. | CERAMICS INTERNATIONAL , 2023 , 49 (21) : 34269-34276 . |
| MLA | Hou, Geng et al. "Fatigue life prediction approach for through-hole of needled ceramic matrix composite based on volume fraction" . | CERAMICS INTERNATIONAL 49 . 21 (2023) : 34269-34276 . |
| APA | Hou, Geng , Shang, De-Guang , Zuo, Lin-Xuan , Qu, Lin-Feng , Xia, Ming , Wu, Shao-Dong et al. Fatigue life prediction approach for through-hole of needled ceramic matrix composite based on volume fraction . | CERAMICS INTERNATIONAL , 2023 , 49 (21) , 34269-34276 . |
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Abstract ：
Fatigue life prediction method based on stress normalization was proposed to reduce the infiuence of material property dispersion on life for CFRC (carbon fibre reinforced composites). In order to consider the effect of temperature on fatigue damage, a temperature infiuence factor was introduced into the fatigue limit equation and the life prediction method under variable amplitude loading at high temperature. Combined with the rainfiow cycle counting and Miner linear damage accumulation rule, the proposed fatigue life prediction method was verified by the experimental results of composite multidirectional laminates under constant amplitude and variable amplitude loadings at various temperatures, and the prediction errors are within a factor of 5.
Keyword ：
Variable amplitude loading Variable amplitude loading Normalization Normalization Fatigue life prediction Fatigue life prediction Mean stress correction Mean stress correction High temperature High temperature
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| GB/T 7714 | Guo, Yi-Er , Shang, De-Guang , Cai, Di et al. Fatigue life prediction considering temperature effect for carbon fibre reinforced composites under variable amplitude loading [J]. | INTERNATIONAL JOURNAL OF FATIGUE , 2023 , 168 . |
| MLA | Guo, Yi-Er et al. "Fatigue life prediction considering temperature effect for carbon fibre reinforced composites under variable amplitude loading" . | INTERNATIONAL JOURNAL OF FATIGUE 168 (2023) . |
| APA | Guo, Yi-Er , Shang, De-Guang , Cai, Di , Jin, Tian , Li, Dao-Hang . Fatigue life prediction considering temperature effect for carbon fibre reinforced composites under variable amplitude loading . | INTERNATIONAL JOURNAL OF FATIGUE , 2023 , 168 . |
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Abstract ：
In this paper, a life prediction method based on damage mechanism for titanium alloy TC4 under multiaxial thermo-mechanical fatigue loading is proposed. Temperature and time dependent influence factors are proposed and introduced into the strain amplitude-life curve method to consider the temperature and time dependence of damage, respectively. The increase in fatigue and oxidation damages caused by tensile mean stress and non-proportional additional hardening is expressed by the mean stress in Macaulay brackets and by using a multiaxial damage param-eter, respectively. A fast cracking influence factor is proposed to consider the influence of fast cracking of materials caused by the combined action of high temperature, tensile stress and shear stress on damage behavior. The material constants are identified by test data under uniaxial and proportional loadings, and are further used for prediction under non-proportional loading. The failure life results of uniaxial isothermal fatigue tests with and without dwell time, uniaxial and multiaxial thermo-mechanical fatigue tests are used to verify the proposed method. The value of the scatter band of life prediction result is less than +/- 2, as well as the maximum and mean relative errors between predicted and experimental strain amplitudes are 18.49% and 6.54%, respectively.
Keyword ：
Titanium alloy Titanium alloy Damage mechanism Damage mechanism Life prediction Life prediction Multiaxial thermo-mechanical fatigue Multiaxial thermo-mechanical fatigue
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| GB/T 7714 | Li, Dao-Hang , Shang, De-Guang , Mao, Zheng-Yu et al. Life prediction method based on damage mechanism for titanium alloy TC4 under multiaxial thermo-mechanical fatigue loading [J]. | ENGINEERING FRACTURE MECHANICS , 2023 , 282 . |
| MLA | Li, Dao-Hang et al. "Life prediction method based on damage mechanism for titanium alloy TC4 under multiaxial thermo-mechanical fatigue loading" . | ENGINEERING FRACTURE MECHANICS 282 (2023) . |
| APA | Li, Dao-Hang , Shang, De-Guang , Mao, Zheng-Yu , Chen, Hong , Cong, Ling-Hua , Tao, Zhi-Qiang . Life prediction method based on damage mechanism for titanium alloy TC4 under multiaxial thermo-mechanical fatigue loading . | ENGINEERING FRACTURE MECHANICS , 2023 , 282 . |
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Abstract ：
The failure mechanism of Ti60 titanium alloy in the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) at different temperatures was investigated. The results showed that, at different temperatures, there are two different fatigue failure mechanisms, i.e., the oversized facet and oxide shedding failure mechanisms. At room temperature, most of the fatigue cracks initiate at the oversized facet. At 300 degrees C, the crack initiates at the oversized facet for the test with small applied stress, while the crack initiates at the oxide shedding site for the test with large applied stress. At 400 degrees C, all the fatigue cracks initiate at the oxide shedding site. Higher temperature and stress will be conducive to the failure mechanism of oxide shedding to become dominant.
Keyword ：
Oxide shedding Oxide shedding High temperature High temperature Fatigue failure mechanism Fatigue failure mechanism Very -high -cycle fatigue Very -high -cycle fatigue Oversized facet Oversized facet
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| GB/T 7714 | Chen, Chao -Lin , Shang, De-Guang , Tang, Zhi-Qiang et al. Fatigue failure mechanism of Ti60 titanium alloy in HCF and VHCF regime at different temperatures [J]. | ENGINEERING FAILURE ANALYSIS , 2023 , 151 . |
| MLA | Chen, Chao -Lin et al. "Fatigue failure mechanism of Ti60 titanium alloy in HCF and VHCF regime at different temperatures" . | ENGINEERING FAILURE ANALYSIS 151 (2023) . |
| APA | Chen, Chao -Lin , Shang, De-Guang , Tang, Zhi-Qiang , Li, Dao-Hang , Yin, Xiang , Guo, Yi-Er . Fatigue failure mechanism of Ti60 titanium alloy in HCF and VHCF regime at different temperatures . | ENGINEERING FAILURE ANALYSIS , 2023 , 151 . |
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