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Effect of pores on the stress field of high-frequency vibration of TC17 specimen manufactured by laser additive

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Abstract

The pores created in the laser powder additive manufacturing process usually reduced the fatigue strength of TC17 titanium alloy components. In response to this phenomenon, this work combined numerical simulation with experiments to study the influence of the pores within the specimen on the vibration stress field and high-cycle fatigue parameters. The results indicated that the apparent high-level stress produced at the surface of the specimen and the magnitude of stress decreased with the depth and even reached few tens of MPa at the center of the specimen. Stress concentration occurred around the pore in the specimen during high-frequency vibration. As the stresses around the pores in the specimen exceeded the maximum stress at the surface, fatigue cracks initiated from the internal pores of the specimen. Moreover, stress concentration was enlarged greatly with the decreasing distance of the pore to the specimen surface. When the pore was located in the sub-surface area of the specimen, the stress concentration around it increased significantly with its size. Therefore, the size and location of the internal pores were very important and worthy of attention due to stress concentration.

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Authors and Affiliations

  1. College of Mechanical Engineering, Shenyang University, No. 21, Wanghua Street, Dadong District, Shenyang, 110044, Liaoning, China

    Yongkui Li & Jun Zhang

  2. AECC Shenyang Aero-Engine Co., Ltd, Shenyang, 110043, Liaoning, China

    Zhenlin Chen

  3. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, Liaoning, China

    Li Lin

  4. Shenyang Research Institute of Foundry Co., Ltd, Shenyang, 110022, Liaoning, China

    Shichang Liu

  5. National Engineering Research Center for Corrosion Control, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, Liaoning, China

    Haitao Wang

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  1. Yongkui Li
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  2. Zhenlin Chen
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  3. Li Lin
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  4. Shichang Liu
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  5. Haitao Wang
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  6. Jun Zhang
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Correspondence to Yongkui Li.

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Li, Y., Chen, Z., Lin, L. et al. Effect of pores on the stress field of high-frequency vibration of TC17 specimen manufactured by laser additive. Int J Fract 235, 117–127 (2022). https://doi.org/10.1007/s10704-021-00613-z

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  • DOI: https://doi.org/10.1007/s10704-021-00613-z

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