Mechanical Performance of SLM-Manufactured Bolts Under Varying Torque Conditions for Aerospace Applications

Mudda Nirish; Koganti Rajendra Prasad; Koganti Lavanya

doi:doi:10.11648/j.ijmea.20251302.13

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Mechanical Performance of SLM-Manufactured Bolts Under Varying Torque Conditions for Aerospace Applications

Mudda Nirish^*

, Koganti Rajendra Prasad, Koganti Lavanya

Published in International Journal of Mechanical Engineering and Applications (Volume 13, Issue 2)

Received: 26 February 2025 Accepted: 14 March 2025 Published: 31 March 2025

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Abstract

This research study examines the mechanical performance of bolts fabricated using Selective Laser Melting (SLM), a Laser Powder Bed Fusion (LPBF) technique widely utilized in the aerospace and automotive industries for producing lightweight, high-performance components. To improve mechanical properties through SLM, building orientation plays a crucial role, particularly in enhancing fatigue strength. This study examines the bolts mechanical properties by using SLM optimal process parameters, including laser power of 225 W, scan speed of 500 mm/s, and hatching distance of 100 µm. This study investigates the mechanical performance of M5, M6, and M8 hexagonal bolts with a focus on tensile strength, creep resistance and effects of torque tightening on fatigue life. Tensile testing demonstrated the bolts’ high strength, achieving an ultimate tensile strength (UTS) of 1189.32 MPa and a yield strength (YS) of 967.61 MPa at room temperature with a crosshead speed of 1 mm/min. Fatigue testing, conducted under pre-load and torque-applied conditions, revealed that proper torque application significantly enhanced fatigue life, extending it from 21,000–25,000 cycles in pre-load conditions to 135,000 cycles under a torque of 12 N-mm. Additionally, creep testing confirmed the material’s long-term stability, showing no deformation or failure when subjected to a sustained load of 660 MPa over a 24-hour period. These results emphasize the critical role of torque tightening in improving fatigue performance and highlight the reliability of the bolts under prolonged stress, making them suitable for high-performance applications in the automotive and aerospace industries.

Published in	International Journal of Mechanical Engineering and Applications (Volume 13, Issue 2)
DOI	10.11648/j.ijmea.20251302.13
Page(s)	73-85
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2025. Published by Science Publishing Group

Keywords

Additive Manufacturing (AM), Selective Laser Melting (SLM), Hexagonal Bolt, Torque Tightening, Mechanical Properties

References

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APA Style

Nirish, M., Prasad, K. R., Lavanya, K. (2025). Mechanical Performance of SLM-Manufactured Bolts Under Varying Torque Conditions for Aerospace Applications. International Journal of Mechanical Engineering and Applications, 13(2), 73-85. https://doi.org/10.11648/j.ijmea.20251302.13

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ACS Style

Nirish, M.; Prasad, K. R.; Lavanya, K. Mechanical Performance of SLM-Manufactured Bolts Under Varying Torque Conditions for Aerospace Applications. Int. J. Mech. Eng. Appl. 2025, 13(2), 73-85. doi: 10.11648/j.ijmea.20251302.13

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AMA Style

Nirish M, Prasad KR, Lavanya K. Mechanical Performance of SLM-Manufactured Bolts Under Varying Torque Conditions for Aerospace Applications. Int J Mech Eng Appl. 2025;13(2):73-85. doi: 10.11648/j.ijmea.20251302.13

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@article{10.11648/j.ijmea.20251302.13,
  author = {Mudda Nirish and Koganti Rajendra Prasad and Koganti Lavanya},
  title = {Mechanical Performance of SLM-Manufactured Bolts Under Varying Torque Conditions for Aerospace Applications
},
  journal = {International Journal of Mechanical Engineering and Applications},
  volume = {13},
  number = {2},
  pages = {73-85},
  doi = {10.11648/j.ijmea.20251302.13},
  url = {https://doi.org/10.11648/j.ijmea.20251302.13},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmea.20251302.13},
  abstract = {This research study examines the mechanical performance of bolts fabricated using Selective Laser Melting (SLM), a Laser Powder Bed Fusion (LPBF) technique widely utilized in the aerospace and automotive industries for producing lightweight, high-performance components. To improve mechanical properties through SLM, building orientation plays a crucial role, particularly in enhancing fatigue strength. This study examines the bolts mechanical properties by using SLM optimal process parameters, including laser power of 225 W, scan speed of 500 mm/s, and hatching distance of 100 µm. This study investigates the mechanical performance of M5, M6, and M8 hexagonal bolts with a focus on tensile strength, creep resistance and effects of torque tightening on fatigue life. Tensile testing demonstrated the bolts’ high strength, achieving an ultimate tensile strength (UTS) of 1189.32 MPa and a yield strength (YS) of 967.61 MPa at room temperature with a crosshead speed of 1 mm/min. Fatigue testing, conducted under pre-load and torque-applied conditions, revealed that proper torque application significantly enhanced fatigue life, extending it from 21,000–25,000 cycles in pre-load conditions to 135,000 cycles under a torque of 12 N-mm. Additionally, creep testing confirmed the material’s long-term stability, showing no deformation or failure when subjected to a sustained load of 660 MPa over a 24-hour period. These results emphasize the critical role of torque tightening in improving fatigue performance and highlight the reliability of the bolts under prolonged stress, making them suitable for high-performance applications in the automotive and aerospace industries.
},
 year = {2025}
}

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TY  - JOUR
T1  - Mechanical Performance of SLM-Manufactured Bolts Under Varying Torque Conditions for Aerospace Applications

AU  - Mudda Nirish
AU  - Koganti Rajendra Prasad
AU  - Koganti Lavanya
Y1  - 2025/03/31
PY  - 2025
N1  - https://doi.org/10.11648/j.ijmea.20251302.13
DO  - 10.11648/j.ijmea.20251302.13
T2  - International Journal of Mechanical Engineering and Applications
JF  - International Journal of Mechanical Engineering and Applications
JO  - International Journal of Mechanical Engineering and Applications
SP  - 73
EP  - 85
PB  - Science Publishing Group
SN  - 2330-0248
UR  - https://doi.org/10.11648/j.ijmea.20251302.13
AB  - This research study examines the mechanical performance of bolts fabricated using Selective Laser Melting (SLM), a Laser Powder Bed Fusion (LPBF) technique widely utilized in the aerospace and automotive industries for producing lightweight, high-performance components. To improve mechanical properties through SLM, building orientation plays a crucial role, particularly in enhancing fatigue strength. This study examines the bolts mechanical properties by using SLM optimal process parameters, including laser power of 225 W, scan speed of 500 mm/s, and hatching distance of 100 µm. This study investigates the mechanical performance of M5, M6, and M8 hexagonal bolts with a focus on tensile strength, creep resistance and effects of torque tightening on fatigue life. Tensile testing demonstrated the bolts’ high strength, achieving an ultimate tensile strength (UTS) of 1189.32 MPa and a yield strength (YS) of 967.61 MPa at room temperature with a crosshead speed of 1 mm/min. Fatigue testing, conducted under pre-load and torque-applied conditions, revealed that proper torque application significantly enhanced fatigue life, extending it from 21,000–25,000 cycles in pre-load conditions to 135,000 cycles under a torque of 12 N-mm. Additionally, creep testing confirmed the material’s long-term stability, showing no deformation or failure when subjected to a sustained load of 660 MPa over a 24-hour period. These results emphasize the critical role of torque tightening in improving fatigue performance and highlight the reliability of the bolts under prolonged stress, making them suitable for high-performance applications in the automotive and aerospace industries.

VL  - 13
IS  - 2
ER  -

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Author Information

Mudda Nirish

R&D Center, MIC Labs, Measure India Corporation Private Limited (MICPL), Sri Nagar, Rampally, Keesara (M), Hyderabad, India

Contact Email

http://orcid.org/0000-0002-7954-9367
Koganti Rajendra Prasad

R&D Center, MIC Labs, Measure India Corporation Private Limited (MICPL), Sri Nagar, Rampally, Keesara (M), Hyderabad, India
Koganti Lavanya

R&D Center, MIC Labs, Measure India Corporation Private Limited (MICPL), Sri Nagar, Rampally, Keesara (M), Hyderabad, India

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APA Style

Nirish, M., Prasad, K. R., Lavanya, K. (2025). Mechanical Performance of SLM-Manufactured Bolts Under Varying Torque Conditions for Aerospace Applications. International Journal of Mechanical Engineering and Applications, 13(2), 73-85. https://doi.org/10.11648/j.ijmea.20251302.13

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ACS Style

Nirish, M.; Prasad, K. R.; Lavanya, K. Mechanical Performance of SLM-Manufactured Bolts Under Varying Torque Conditions for Aerospace Applications. Int. J. Mech. Eng. Appl. 2025, 13(2), 73-85. doi: 10.11648/j.ijmea.20251302.13

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AMA Style

Nirish M, Prasad KR, Lavanya K. Mechanical Performance of SLM-Manufactured Bolts Under Varying Torque Conditions for Aerospace Applications. Int J Mech Eng Appl. 2025;13(2):73-85. doi: 10.11648/j.ijmea.20251302.13

Copy | Download

@article{10.11648/j.ijmea.20251302.13,
  author = {Mudda Nirish and Koganti Rajendra Prasad and Koganti Lavanya},
  title = {Mechanical Performance of SLM-Manufactured Bolts Under Varying Torque Conditions for Aerospace Applications
},
  journal = {International Journal of Mechanical Engineering and Applications},
  volume = {13},
  number = {2},
  pages = {73-85},
  doi = {10.11648/j.ijmea.20251302.13},
  url = {https://doi.org/10.11648/j.ijmea.20251302.13},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmea.20251302.13},
  abstract = {This research study examines the mechanical performance of bolts fabricated using Selective Laser Melting (SLM), a Laser Powder Bed Fusion (LPBF) technique widely utilized in the aerospace and automotive industries for producing lightweight, high-performance components. To improve mechanical properties through SLM, building orientation plays a crucial role, particularly in enhancing fatigue strength. This study examines the bolts mechanical properties by using SLM optimal process parameters, including laser power of 225 W, scan speed of 500 mm/s, and hatching distance of 100 µm. This study investigates the mechanical performance of M5, M6, and M8 hexagonal bolts with a focus on tensile strength, creep resistance and effects of torque tightening on fatigue life. Tensile testing demonstrated the bolts’ high strength, achieving an ultimate tensile strength (UTS) of 1189.32 MPa and a yield strength (YS) of 967.61 MPa at room temperature with a crosshead speed of 1 mm/min. Fatigue testing, conducted under pre-load and torque-applied conditions, revealed that proper torque application significantly enhanced fatigue life, extending it from 21,000–25,000 cycles in pre-load conditions to 135,000 cycles under a torque of 12 N-mm. Additionally, creep testing confirmed the material’s long-term stability, showing no deformation or failure when subjected to a sustained load of 660 MPa over a 24-hour period. These results emphasize the critical role of torque tightening in improving fatigue performance and highlight the reliability of the bolts under prolonged stress, making them suitable for high-performance applications in the automotive and aerospace industries.
},
 year = {2025}
}

Copy | Download

TY  - JOUR
T1  - Mechanical Performance of SLM-Manufactured Bolts Under Varying Torque Conditions for Aerospace Applications

AU  - Mudda Nirish
AU  - Koganti Rajendra Prasad
AU  - Koganti Lavanya
Y1  - 2025/03/31
PY  - 2025
N1  - https://doi.org/10.11648/j.ijmea.20251302.13
DO  - 10.11648/j.ijmea.20251302.13
T2  - International Journal of Mechanical Engineering and Applications
JF  - International Journal of Mechanical Engineering and Applications
JO  - International Journal of Mechanical Engineering and Applications
SP  - 73
EP  - 85
PB  - Science Publishing Group
SN  - 2330-0248
UR  - https://doi.org/10.11648/j.ijmea.20251302.13
AB  - This research study examines the mechanical performance of bolts fabricated using Selective Laser Melting (SLM), a Laser Powder Bed Fusion (LPBF) technique widely utilized in the aerospace and automotive industries for producing lightweight, high-performance components. To improve mechanical properties through SLM, building orientation plays a crucial role, particularly in enhancing fatigue strength. This study examines the bolts mechanical properties by using SLM optimal process parameters, including laser power of 225 W, scan speed of 500 mm/s, and hatching distance of 100 µm. This study investigates the mechanical performance of M5, M6, and M8 hexagonal bolts with a focus on tensile strength, creep resistance and effects of torque tightening on fatigue life. Tensile testing demonstrated the bolts’ high strength, achieving an ultimate tensile strength (UTS) of 1189.32 MPa and a yield strength (YS) of 967.61 MPa at room temperature with a crosshead speed of 1 mm/min. Fatigue testing, conducted under pre-load and torque-applied conditions, revealed that proper torque application significantly enhanced fatigue life, extending it from 21,000–25,000 cycles in pre-load conditions to 135,000 cycles under a torque of 12 N-mm. Additionally, creep testing confirmed the material’s long-term stability, showing no deformation or failure when subjected to a sustained load of 660 MPa over a 24-hour period. These results emphasize the critical role of torque tightening in improving fatigue performance and highlight the reliability of the bolts under prolonged stress, making them suitable for high-performance applications in the automotive and aerospace industries.

VL  - 13
IS  - 2
ER  -

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