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学者姓名：尚德广
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Abstract ：
The very high cycle fatigue crack initiation mechanism of Ti60 titanium alloy at different temperatures was studied. The results showed that the initiation of cracks occurred on oversized facets in the subsurface. Based on this crack initiation mechanism, a full-life prediction model based on crack propagation at room temperature was first proposed, and then a very high cycle fatigue life prediction model considering temperature was proposed based on the degradation law of tensile strength at different temperatures. The experimental and predicted life results of Ti60 specimen at room temperature with 300 degrees C and 500 degrees C showed that the proposed method can effectively predict the very high cycle fatigue life, and the error is within a factor of 3.
Keyword ：
Oversized facet Oversized facet Life prediction Life prediction Crack initiation mechanism Crack initiation mechanism Very high cycle fatigue Very high cycle fatigue Oxide shedding Oxide shedding
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| GB/T 7714 | Chen, Chao -Lin , Shang, De-Guang , Xiao, Na-Min et al. Fatigue life prediction of Ti60 titanium alloy under very high cycle loading at different temperatures [J]. | INTERNATIONAL JOURNAL OF FATIGUE , 2023 , 176 . |
| MLA | Chen, Chao -Lin et al. "Fatigue life prediction of Ti60 titanium alloy under very high cycle loading at different temperatures" . | INTERNATIONAL JOURNAL OF FATIGUE 176 (2023) . |
| APA | Chen, Chao -Lin , Shang, De-Guang , Xiao, Na-Min , Li, Xing -Wu , Sha, Ai-Xue , Li, Jing et al. Fatigue life prediction of Ti60 titanium alloy under very high cycle loading at different temperatures . | INTERNATIONAL JOURNAL OF FATIGUE , 2023 , 176 . |
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Abstract ：
The experimental results show that needled C/SiC composite exhibits nonlinear stiffness characteristics in the process of vibration. In order to consider the effect of the number of fiber layers on the fatigue properties, the S-N curve related to the number of 0 degrees layer fibers for needled C/SiC composite is proposed in this investigation. According to the relationship between the frequency response curve and the signal strength, an amplitude probability density function under narrow band random vibrations was proposed for predicting the fatigue life for the notched plate specimen. The results showed that the proposed method has a good prediction effect.
Keyword ：
Rayleigh model Rayleigh model Needled C Needled C SiC composite SiC composite Random vibration Random vibration Vibration fatigue life Vibration fatigue life S-N curve S-N curve
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| GB/T 7714 | Wu, Shao-Dong , Shang, De-Guang , Zuo, Lin-Xuan et al. Vibration fatigue life prediction method for needled C/SiC composite based on frequency response curve with low signal strength [J]. | INTERNATIONAL JOURNAL OF FATIGUE , 2023 , 168 . |
| MLA | Wu, Shao-Dong et al. "Vibration fatigue life prediction method for needled C/SiC composite based on frequency response curve with low signal strength" . | INTERNATIONAL JOURNAL OF FATIGUE 168 (2023) . |
| APA | Wu, Shao-Dong , Shang, De-Guang , Zuo, Lin-Xuan , Qu, Lin-Feng , Hou, Geng , Hao, Guo-Cheng et al. Vibration fatigue life prediction method for needled C/SiC composite based on frequency response curve with low signal strength . | INTERNATIONAL JOURNAL OF FATIGUE , 2023 , 168 . |
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Abstract ：
Strain rate sensitivity will change the cyclic mechanical response of materials under multiaxial thermomechanical fatigue loading; thus, it will lead to errors in fatigue life prediction if strain rate sensitivity is not considered in constitutive simulation. In order to more accurately express the time/rate dependence of viscoplastic behavior, a strain rate sensitivity factor is proposed to modify the viscoplastic function of Chaboche model first. On this basis, a viscoplastic constitutive model considering strain rate sensitivity under multiaxial thermomechanical fatigue loading is proposed, which can describe the varying influence of strain rate sensitivity on cyclic mechanical behavior. Meanwhile, the exponential isotropic hardening rule with the linear term is adopted to characterize the initial rapid softening and subsequent stable softening of the material under fatigue loading at elevated temperature. Moreover, the material-dependent nonproportional hardening coefficient and the loading path-dependent rotation factor are used in the kinematic hardening rule to consider the effect of nonproportional additional hardening on the cyclic mechanical behavior of materials. Finally, the proposed method is verified by the stress-strain data of titanium alloy TC4 and Ni-based superalloy GH4169 under uniaxial and multiaxial thermomechanical fatigue loadings, and a good agreement is obtained.
Keyword ：
thermomechanical fatigue thermomechanical fatigue multiaxial loading multiaxial loading viscoplastic constitutive model viscoplastic constitutive model high-temperature materials high-temperature materials strain rate sensitivity strain rate sensitivity
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| GB/T 7714 | Li, Dao-Hang , Shang, De-Guang , Chen, Hong et al. Viscoplastic constitutive model considering strain rate sensitivity under multiaxial thermomechanical fatigue loading [J]. | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES , 2023 , 46 (4) : 1455-1472 . |
| MLA | Li, Dao-Hang et al. "Viscoplastic constitutive model considering strain rate sensitivity under multiaxial thermomechanical fatigue loading" . | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES 46 . 4 (2023) : 1455-1472 . |
| APA | Li, Dao-Hang , Shang, De-Guang , Chen, Hong , Cong, Ling-Hua , Wang, Jin-Jie , Mao, Zheng-Yu et al. Viscoplastic constitutive model considering strain rate sensitivity under multiaxial thermomechanical fatigue loading . | FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES , 2023 , 46 (4) , 1455-1472 . |
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Abstract ：
Needled C/SiC composites are widely used in the aerospace field, making the evaluation of fatigue damage critically important. A fatigue damage model associated with the individual modulus is proposed. Compared to the fatigue damage model by S-N curve, the proposed fatigue damage model can better characterize the fatigue damage behavior of UN-C/SiC composites. By combining the rainflow counting method, the Goodman equation, and the Palmgren-Miner damage accumulation rule, a fatigue life prediction method considering the individual modulus is developed for UN-C/SiC composites under variable amplitude loading. Compared with the experimental life, the predicted fatigue life shows a good result.
Keyword ：
Ceramic matrix composites Ceramic matrix composites Variable amplitude loading Variable amplitude loading Fatigue life prediction Fatigue life prediction Needled C/SiC composites Needled C/SiC composites
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| GB/T 7714 | Yin, Xiang , Shang, De-Guang , Zuo, Lin-Xuan et al. Fatigue life prediction considering individual modulus for unidirectional needled C/SiC composites under variable amplitude loading [J]. | ENGINEERING FRACTURE MECHANICS , 2023 , 295 . |
| MLA | Yin, Xiang et al. "Fatigue life prediction considering individual modulus for unidirectional needled C/SiC composites under variable amplitude loading" . | ENGINEERING FRACTURE MECHANICS 295 (2023) . |
| APA | Yin, Xiang , Shang, De-Guang , Zuo, Lin-Xuan , Qu, Lin-Feng , Zhang, Hang , Zhou, Shuai et al. Fatigue life prediction considering individual modulus for unidirectional needled C/SiC composites under variable amplitude loading . | ENGINEERING FRACTURE MECHANICS , 2023 , 295 . |
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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 ：
The vibration fatigue life and vibration response signal at the dangerous position of each specimen were obtained by the broadband random vibration fatigue test for 7075-T651 aluminum alloy, and the stress amplitude probability distribution of vibration response signal was counted by rainflow counting method. By comparing the probability density distribution functions of broadband random vibration signal by frequency-domain method and analyzing the fitting accuracy of different distribution models for rainflow distribution, a new model for frequency-domain fatigue life prediction based on modified narrowband distribution model was proposed. The proposed model takes the second-order spectral width parameter of vibration signal as the weight coefficient, and the life prediction results are more accurate and less dispersive.
Keyword ：
Fatigue life Fatigue life Random vibration Random vibration Rayleigh distribution Rayleigh distribution Broadband signal Broadband signal Aluminum alloy Aluminum alloy
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| GB/T 7714 | Wu, Shao-Dong , Shang, De-Guang , Liu, Peng-Cheng et al. Fatigue life prediction based on modified narrowband method under broadband random vibration loading [J]. | INTERNATIONAL JOURNAL OF FATIGUE , 2022 , 159 . |
| MLA | Wu, Shao-Dong et al. "Fatigue life prediction based on modified narrowband method under broadband random vibration loading" . | INTERNATIONAL JOURNAL OF FATIGUE 159 (2022) . |
| APA | Wu, Shao-Dong , Shang, De-Guang , Liu, Peng-Cheng , Hao, Guo-Cheng , Hou, Geng , Shi, Feng-Tian et al. Fatigue life prediction based on modified narrowband method under broadband random vibration loading . | INTERNATIONAL JOURNAL OF FATIGUE , 2022 , 159 . |
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Abstract ：
In order to study the properties of needled C/SiC composite under random vibration loading, a kind of plate specimen with arc notch was designed. Random vibration tests were carried out on a vibration table, the vi-bration fatigue life and vibration response signal at the dangerous position of each specimen were obtained. The strain amplitude probability distribution of vibration response signal was obtained by rainflow counting method, which can be approximately described by the Dirlik distribution. The attenuation history curve of natural fre-quency for the specimen presented obvious nonlinearity. In addition, the microscopic fracture morphology of failed specimens showed that the major failure mode of fibers in axial and transverse direction are pull-out and splitting, respectively. And the fiber bundles adhering strongly to the matrix can form a neat fracture surface.
Keyword ：
Random vibration Random vibration Dirlik distribution Dirlik distribution Fatigue Fatigue SiC SiC Composite Composite Needled C Needled C
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| GB/T 7714 | Wu, Shao-Dong , Shang, De -Guang , Zuo, Lin-Xuan et al. Notch fatigue behavior of needled C/SiC composite under random vibration loading [J]. | CERAMICS INTERNATIONAL , 2022 , 48 (6) : 8349-8358 . |
| MLA | Wu, Shao-Dong et al. "Notch fatigue behavior of needled C/SiC composite under random vibration loading" . | CERAMICS INTERNATIONAL 48 . 6 (2022) : 8349-8358 . |
| APA | Wu, Shao-Dong , Shang, De -Guang , Zuo, Lin-Xuan , Qu, Lin-Feng , Wang, Song -Guang , Hou, Geng et al. Notch fatigue behavior of needled C/SiC composite under random vibration loading . | CERAMICS INTERNATIONAL , 2022 , 48 (6) , 8349-8358 . |
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Abstract ：
The modified incremental multiaxial Neuber rule by considering the temperature change was firstly proposed, which combined with the Chaboche viscoplastic constitutive model to approximately compute the notch local stress and strain under multiaxial thermo-mechanical loading. Based on the proposed method, a life prediction method that can take into account fatigue, oxidation, and creep damage was developed, which can quickly predict notch fatigue failure lifetime under variable amplitude multiaxial thermo-mechanical loading. The proposed method was verified by the coupled thermal-structural nonlinear FEA and the experimental life results for the tenon joint structure specimens under eight thermo-mechanical loading paths. The comparison of computed and analyzed stress-strain history showed that a good agreement can be obtained. Comparing with experimental life data, all predicted lives fall in a 2-factor scatter band.
Keyword ：
Local stress-strain estimation Local stress-strain estimation Notch fatigue life prediction Notch fatigue life prediction Temperature change Temperature change Effective stress concentration factor Effective stress concentration factor Thermal-structural nonlinear FEA Thermal-structural nonlinear FEA
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| GB/T 7714 | Chen, Feng , Shang, De-Guang , Li, Dao-Hang et al. Multiaxial thermo-mechanical fatigue life prediction based on notch local stress-strain estimation considering temperature change [J]. | ENGINEERING FRACTURE MECHANICS , 2022 , 265 . |
| MLA | Chen, Feng et al. "Multiaxial thermo-mechanical fatigue life prediction based on notch local stress-strain estimation considering temperature change" . | ENGINEERING FRACTURE MECHANICS 265 (2022) . |
| APA | Chen, Feng , Shang, De-Guang , Li, Dao-Hang , Wang, Ling-Wan . Multiaxial thermo-mechanical fatigue life prediction based on notch local stress-strain estimation considering temperature change . | ENGINEERING FRACTURE MECHANICS , 2022 , 265 . |
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Abstract ：
In this study, the fatigue damage modes of carbon fiber/epoxy composite laminates with symmetrical architecture were investigated by acoustic emission (AE) technique under fully reversed loading. The principal component analysis and the K-means cluster analysis using correlation AE characteristic parameters, including the energy, the amplitude, and the duration time, were performed to identify various damage modes during the fatigue test process. The analysis results of the AE signals indicated that the high-intensity AE signals were generated by the compressive load and the low-intensity AE signals were generated by the tensile load. The maximum energy and duration time generated by the compression load are approximately 20 and 10 times that of the tensile load, respectively, which was consistent with the force-controlled static test results under tension and compression loadings. Therefore, the fatigue damage caused by the compressive load is much greater than that of tensile load under fully reversed loading. The results of the multi-AE parametric clustering analysis combined with scanning electron microscope micromorphology revealed that the damage modes of the laminate specimens were classified into five types, namely matrix cracks, fiber/epoxy interface debonding, shear, delamination, and fiber breakage. In addition, the damage modes at different stages during the fatigue test process were also analyzed and discussed.
Keyword ：
composite laminates composite laminates tension-compression fatigue tension-compression fatigue damage mechanism damage mechanism acoustic emission acoustic emission
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| GB/T 7714 | Guo, Yi-Er , Shang, De-Guang , Zuo, Lin-Xuan et al. Identification of fatigue damage modes for carbon fiber/epoxy composites using acoustic emission monitoring under fully reversed loading [J]. | POLYMER COMPOSITES , 2022 , 43 (6) : 3371-3385 . |
| MLA | Guo, Yi-Er et al. "Identification of fatigue damage modes for carbon fiber/epoxy composites using acoustic emission monitoring under fully reversed loading" . | POLYMER COMPOSITES 43 . 6 (2022) : 3371-3385 . |
| APA | Guo, Yi-Er , Shang, De-Guang , Zuo, Lin-Xuan , Qu, Lin-Feng , Hou, Geng , Cai, Di et al. Identification of fatigue damage modes for carbon fiber/epoxy composites using acoustic emission monitoring under fully reversed loading . | POLYMER COMPOSITES , 2022 , 43 (6) , 3371-3385 . |
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Abstract ：
In this paper, the experimental investigation was carried out on the TC4 titanium alloy to understand the cyclic deformation behavior and fatigue damage mechanism of materials under multiaxial thermo-mechanical loading. The results showed that the fast cracking mode of the material may be activated by the combined action of high temperature, tensile stress and shear stress, inducing a fast degradation in the axial mechanical properties of the material, which results in a drastic decrease in the failure life of the material. Moreover, it is also found that the non-proportional additional hardening and the tensile mean stress can increase the fatigue and oxidation damages of the material, and the material damage behavior is temperature dependent and time dependent. It should be pointed out that the damage mechanisms identified in this paper can reasonably explain the life law under uniaxial isothermal fatigue loading with and without dwell time, uniaxial and multiaxial thermomechanical fatigue loadings.
Keyword ：
Multiaxial thermo-mechanical fatigue Multiaxial thermo-mechanical fatigue Deformation behavior Deformation behavior Fatigue-oxidation Fatigue-oxidation Damage mechanism Damage mechanism Titanium alloy Titanium alloy
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| GB/T 7714 | Li, Dao-Hang , Shang, De-Guang , Chen, Hong et al. Multiaxial thermo-mechanical fatigue damage mechanism of TC4 titanium alloy [J]. | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2022 , 121 . |
| MLA | Li, Dao-Hang et al. "Multiaxial thermo-mechanical fatigue damage mechanism of TC4 titanium alloy" . | THEORETICAL AND APPLIED FRACTURE MECHANICS 121 (2022) . |
| APA | Li, Dao-Hang , Shang, De-Guang , Chen, Hong , Cong, Ling-Hua , Wang, Jin-Jie , Zhou, Xue-Peng et al. Multiaxial thermo-mechanical fatigue damage mechanism of TC4 titanium alloy . | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2022 , 121 . |
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