An experimental investigation of the bolt clamping force and friction effect on the fatigue behavior of aluminum alloy 2024-T3 double shear lap joint

2011 ◽  
Vol 32 (8-9) ◽  
pp. 4641-4649 ◽  
Author(s):  
T.N. Chakherlou ◽  
M.J. Razavi ◽  
A.B. Aghdam ◽  
B. Abazadeh
Keyword(s):  
Experimental Investigation ◽  
Aluminum Alloy ◽  
Fatigue Behavior ◽  
Clamping Force ◽  
Lap Joint ◽  
Friction Effect ◽  
Double Shear ◽  
Aluminum Alloy 2024

Effect of bolt tightening on the fatigue behavior of GLARE double shear lap joints

2021 ◽  
pp. 002199832110033
Author(s):  
B Abazadeh ◽  
HR Maleki
Keyword(s):  
Fatigue Life ◽  
Fatigue Behavior ◽  
Fatigue Tests ◽  
Lap Joints ◽  
Clamping Force ◽  
Test Results ◽  
Load Range ◽  
Double Shear ◽  
Aluminum Sheets ◽  
Aluminum Alloy 2024

In this paper, the effect of bolt torque tightening has been investigated on the fatigue behavior of GLARE in double shear lap configuration. To do so, experimental fatigue tests were conducted using GLARE3-5/4-0.4 specimens with applied torques of 0 (finger tightened), 2 and 4 Nm at different cyclic longitudinal load ranges to achieve the stress-life (S-N) curves. The results revealed that applying and increasing the clamping force enhances the fatigue life of the GLARE specimens. Furthermore, comparison of fatigue test results of GLARE and available monolithic aluminum alloy 2024-T3 plates indicated when the applied load range is low, the effect of clamping force is more noticeable in GLARE specimens due to longer fatigue crack growth life of GLARE. Also, the occurrence of fretting fatigue didn’t reduce the fatigue life of GLARE specimens considerably in contrary to aluminum sheets because of the laminated structure of GLARE. The obtained results can provide insights in designing bolted GLARE joints with superior fatigue in-service performance.

Comparison between bolt clamping force and composite patches for repairing aircraft structures of aluminum alloy 2024-T3

2018 ◽  
Vol 233 (5) ◽  
pp. 1758-1771 ◽  
Author(s):  
HN Maleki ◽  
TN Chakherlou
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Fracture Strength ◽  
Pure Shear ◽  
Shear Mode ◽  
Clamping Force ◽  
Test Results ◽  
Composite Patch ◽  
Cracked Structures ◽  
Aluminum Alloy 2024

Many parts used in various industries are subjected to multiaxial stresses during service phase, and since cracks can be a source of failure in the parts, it is extremely important to analyze the strength of cracked structures under multiaxial loads, and improve the structures fracture strength. In the present research, the effect of clamping force resulted from bolted pre-tension and composite patches on enhancing fracture strength of edge cracked rectangular samples made of aluminum-alloy 2024-T3 are evaluated both experimentally and theoretically. The cracked laboratory samples were tested using a modified version of Arcan fixture to develop pure tensile, pure shear, and mixed modes of loading. Further, finite-element simulations were utilized to find stress intensity factors to explain the experimental test results. The experimental results indicate a significant increase in the tensile strength of repaired parts by the bolt clamping and composite patches compared to simple cracked samples. Repaired samples with composite patch and bolt clamping exhibited up to 44% and 24% increase in tensile strength under pure tensile mode, respectively. However, in pure shear mode, the fracture strength increased to 18% and 9% by bolt clamping and composite patch, respectively.

Sign in / Sign up

Export Citation Format

Share Document