Critical Crack Size Investigation Method for a Land Launcher

Authors

  • Ali Yetgin Research & Development Department, Roketsan, Turkey
  • A. Acar Research & Development Department, Roketsan, Turkey
  • S. Kadıoğlu Department of Mechanical Engineering, Middle East Technical University, Turkey

DOI:

https://doi.org/10.3849/aimt.01230

Keywords:

fracture mechanics, weld, finite element,, launcher, structural integrity

Abstract

Structural integrity evaluation of military systems is vital in such applications as rocket launchers. In safe life design, for a certain operational life the system is ensured to function well and no failure would occur even in the presence of some imperfections or flaws. This paper considers the fracture analysis as part of the safe life design approach that is used in the design of a rocket launcher. A methodology based on sub modelling technique is introduced. It was made sure that unstable crack growth would not occur upto certain crack sizes. Subsequently, after actual manufacturing of the launcher, critical locations of welds in the system were checked for presence of any cracks after repeated firing loads. After these controls no cracks were detected due to operational conditions until the time when this document was prepared.

Author Biography

  • Ali Yetgin, Research & Development Department, Roketsan, Turkey

    Senior structural analysis engineer

    MSc and BSc in Mechanical Engineering

References

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GIGLIO M. and MANES A. Crack Propagation on Helicopter Panel: Experimental Test and Analysis. Engineering Fracture Mechanics, 2008, vol. 75, no. 3‐4, p. 866-879. https://doi.org/10.1016/j.engfracmech.2007.02.024.

ACAR, B., YETGIN, A. and KADIOGLU S. Dynamic Finite Element Analysis of a Cradle System. In 84th Shock and Vibration Symposium, 2013.

ANDERSON, T.L. Fracture Mechanics: Fundamentals and Applications. 3rd edition. Boca Raton: Taylor & Francis, 2005.

ACAR, B. Finite element analysis of fracture mechanics problems [Master’s Thesis], Ankara: Middle East Technical University, 1997.

YETGIN, A. Fracture Analysis of Welded Connections [Master Thesis]. Ankara: Middle East Technical University, 2013.

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Published

23-05-2018

Issue

Section

Research Paper

Categories

How to Cite

Yetgin, A., Acar, A., & Kadıoğlu, S. (2018). Critical Crack Size Investigation Method for a Land Launcher. Advances in Military Technology, 13(1), 119-131. https://doi.org/10.3849/aimt.01230

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