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RISS 인기검색어
- 검색키워드
- 저자 : Xuteng Hu (검색결과 4 건)
- 무료
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- 유료
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Effect of notch geometry on the fatigue strength and critical distance of TC4 titanium alloy
Xuteng Hu,Xu Jia,Zhenqiang Bao,Yingdong Song 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.10
Studying the effect of different geometric features of machined notch on the fatigue strength and critical distance has an important guiding role to understand the critical distance size effect and to predict the HCF strength of turbine engine fan blades after FOD. Systematically experimental investigations of geometrical characteristic effects on the 10 6 cycle fatigue strength and critical distance for TC4 machined notched plates at stress ratios of R = 0.1 have been conducted. 123 specimens, including unnotched plates and three different types of notched plates (V-notches, U-notches and C-notches) with various notch root radii, depths and angles have been considered. The results indicate that the notch with small radius can significantly lead to high stress concentration and greatly reduce the HCF strength, while the notch angle and notch depth can affect the HCF strength to a certain extent. The K t related model does not apply to describe the critical distance size effect perfectly. The critical distance has linear relationship with the notch root radius but no significant correction with the notch depth or notch angle. The findings of this study are beneficial for the size effect modeling and later fatigue strength evaluating of TC4 notched components.
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Wenming Ye,Xuteng Hu,Yingdong Song 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.6
Creep is one of the important failure mechanisms of structures operating in high-temperature environments, so accurately assessing the creep properties of materials is essential to structural design and analysis. However, most of the creep researches, there is no uniform method to accurately describe the creep deformation and life. On the basis of previous studies, this paper replaceed the nominal stress in the traditional creep model with the normalized stress of tensile strength and obtains a new constitutive model capable of describing the whole process of creep. It is also applied to the evaluation of creep properties of TC11 titanium alloy at 500 °C. The parameters of different creep constitutive models are obtained by fitting experimental data, including θ-projection model, Batsoulas model, CDM model and proposed model. The advantages and disadvantages of different models are also analysed. In addition, the improvement of the new constitutive model is also discussed.
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Fatigue strength predictions of FOD dents using ΔK threshold methods considering residual stresses
Xu Jia,Xuteng Hu,Zijia Zhu,Yingdong Song 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.1
Fatigue strength predictions of TC4 FOD-dent specimens using ΔK threshold methods considering residual stresses were the main emphasis in this paper. Both the experimental simulation and the fatigue test were conducted to evaluate the HCF performance of the real FOD dent. The geometrical models of FOD dents were established for the elastic stress concentration analysis. Residual stresses around the dent were numerical simulated or reservedly solved from the laboratory test data and subsequently established as a function of the dent depth. With numerical simulated residual stresses, the prediction results fall into an error interval of about ±30 %. With the reserved residual stress, the method has a smaller error interval of about ±20 %. Both the two procedures can fortunately meet the exit criteria which is probably because the potential micro-damages like micro crack and adiabatic shear band etc. could be counted as sharp cracks.
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Lei Zhu,Zhirong Wu,Xuteng Hu,Yingdong Song 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.11
We investigated the small fatigue crack behavior of alloy GH4169 by using single-edge-notch tension specimens. Residual stress introduced by machining process was taken into consideration, and two stress levels were selected. A comparison was made between the experimental results of specimens with and without machining-induced residual stress. The results indicated that fatigue cracks of the two types of specimens initiated from surface inclusions or grain boundaries. For both types of specimens, small cracks grew very slowly when the crack lengths were less than 500 μm. The small crack growth might decelerate and retard temporarily for the existence of grain boundaries. The residual stress effect on crack growth can be identified at σ max = 380 MPa, i.e., compressive residual stress might impede the crack growth. However, this phenomenon was indistinguishable at σ max = 410 MPa.
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