Abstract
Over the years, the flight safety has become a matter of prime concern due to several fatigue failures of structural components and the need to prevent them. Among these, large number of fatigue failures was initiated at major discontinuities such as the inevitable structural joints. Due to this, structural health monitoring (SHM) at these critical locations has become a crucial aspect in the modern damage tolerance-based design concept. Lug joints are often preferred in large-scale structural components which act as primary load-carrying members and are more susceptible to failure due to high stress concentration and geometric irregularities. The primary issue in the analysis of these joints is the loss of contact between the pin–hole boundary during loading and possible change in contact conditions during fatigue loading. This paper deals with the behaviour of tapered attachment lug joints under fatigue loading and finally presents prognostic analysis to estimate remaining life of the joints at any instant of fatigue cycles.
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- \(2a\) :
-
Hole diameter
- \(a^{\prime}\, \text{and} \,b^{\prime}\) :
-
Crack growth material constants
- \(a_{\text{c}}\) :
-
Critical crack length
- b :
-
Fatigue strength exponent
- \(C\,\text{and} \,m\) :
-
Material constants
- \(c\,\text{and} \,s\) :
-
Regions of contact/separation
- \(G_{\text{I}}\) :
-
Mode-1 Strain energy release rate
- \(K_{\text{I}}\) :
-
Mode-1 Stress intensity factor
- \(K_{\text{Ic}}\) :
-
Mode-1 Fracture toughness
- \(K_{\text{t}}\) :
-
Stress concentration factor
- \(L\,\text{and}\,W\) :
-
Length and width of the lug
- P :
-
Pin load
- \(R\,\text{and} \,R_{P}\) :
-
Stress and load ratios
- \(R_{i} \,\text{and}\,R_{o}\) :
-
Inner and outer radii of the lug
- \(\beta /2\) :
-
Taper angle
- \(\sigma_{t} \,\text{and} \,\sigma_{r}\) :
-
Tangential and radial stresses
- \(\sigma_{\text{br}}\) :
-
Bearing stress
- \(\tau_{r\theta }\) :
-
Shear stress
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Acknowledgements
The work presented in this paper is carried out under the project Structural Damage Mitigation sanctioned by Aeronautical R&D Board. The investigators profusely thank the Structures Panel, Aeronautical R&D Board, India, for sanctioning the project.
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Bharath, K., Sravan Kumar, B.V., Chikmath, L., Dattaguru, B. (2018). SHM—Prognostic Analysis of Tapered Attachment Lugs Under Fatigue Loading. In: Prakash, R., Jayaram, V., Saxena, A. (eds) Advances in Structural Integrity. Springer, Singapore. https://doi.org/10.1007/978-981-10-7197-3_47
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