Investigating the Fatigue Crack Initiation Location in Interference Fitted and/or bolt Clamped Al 2024-T3 Double Shear Lap Joints

In this paper the fatigue crack initiation location of double shear lap joints, treated by interference fit and bolt clamping, have been investigated both experimentally and numerically. To do so, using the fracture section of available fatigue tested specimens of interference fitted and torque tightened Aluminum 2024-T3 plates, the crack initiation location was determined. The stress distribution attained from the finite element analysis was used to help explain the results observed in the experimental tests. The results showed that the fatigue crack initiation location changes from top and mid plane at the hole edge to somewhere far from the hole edge (stress concentration region) in different combination of clamping force, interference fit size and applied cyclic load ranges. It is worth mentioning that the fatigue crack initiation location affects the fatigue life of the specimens too.

• Babak Abazadeh
• Hadi Rezghi Maleki

• Fatigue crack initiation
• interference fit
• bolt clamping
• double shear lap joint.

[1] John H, Crews Jr NASA Langley Research Center, Hampton, VA 23665, 1975.
[2] Chakherlou TN, Mirzajanzadeh M, Abazadeh B, Saeedi K, European Journal of Mechanics A/Solids 29, (2010) 675–682.
[3] Chakherlou TN, Oskouei RH, Vogwell J, Eng. Fail Anal. 15(2008), 563–574.
[4] Chakherlou TN, Mirzajanzadeh M, Vogwell J, Abazadeh B, Aerospace
Sc and Tech. 15 (2011), 304–313.
[5] Chakherlou TN, Abazadeh B, Vogwell J, Eng Fail Anal. (2009) 6, 242–
53
[6] Chakherlou TN, Vogwell J, Eng. Fail Anal. 10(2003), 13–24.
[7] Chakherlou TN, Vogwell J Fatigue Fract Eng Mater Struct. 27(2004),
343–351.
[8] Chakherlou TN, Mirzajanzadeh M, Vogwell, Eng Fail Anal 16(2009),
2066–2080.
[9] Chakherlou TN, Razavi MJ, Aghdam AB, Abazadeh B, Mat and Des 23
(2011) , 4641-4649.
[10] Chakherlou TN, Abazadeh B, Mat and Des. 33(2012), 425–435.
[11] Chakherlou TN, Razavi MJ, Aghdam AB, Strain, An Int J Exp Mech. 48
(1) (2012), 21-29.