Characterization of Transverse Impact Damage on Adhesively Bonded Glass/Epoxy Composite Joints

2004 ◽  
Author(s):  
Hyonny Kim ◽  
Tulin Kayir ◽  
Stephanie Steber
Keyword(s):  
Epoxy Composite ◽  
Impact Damage ◽  
Composite Joints ◽  
Transverse Impact ◽  
Adhesively Bonded

Effect of Washers and Bolt Tension on the Behavior of Double-Lap S2-Glass Fabric Epoxy Composite Joints

2008 ◽  
Author(s):  
Vinayshankar L. Virupaksha ◽  
Sayed A. Nassar
Keyword(s):  
Epoxy Composite ◽  
Bolted Joints ◽  
Glass Fabric ◽  
Composite Joints ◽  
Percentage Increase ◽  
Double Shear ◽  
Bolt Preload ◽  
Load Increase ◽  
Bearing Stiffness

Experimental characterization of thick composite bolted joints is performed to study the effect of washer size and bolt preload on bearing properties. S2-glass fabric-epoxy composite coupons [0/90; +45/−45 @ 10 sets] of 12.5 mm thickness were tested under double shear tensile loading. Two different washer sizes and thicknesses were used in this investigation. A force washer is used to monitor the clamp load variation during the test. It has been found that the initial bolt tension (preload) and washer size have a significant effect on bearing stiffness and bearing strength of thick composite joints. For a low bolt preload, test data shows a significant clamp load increase with the joint displacement. However, the percentage increase in clamp load is reduced as the preload is increased to 50kN. The outward buckling and delamination of the laminate in the composite coupons were found to be the main cause for clamp load increase.

scholarly journals Impact of Adhesively Bonded Composite Joints with Edge Effect

2000 ◽  
Vol 9 (6) ◽  
pp. 096369350000900
Author(s):  
I.R. Farrow ◽  
K. Potter ◽  
A. Fisher ◽  
M. Kelly
Keyword(s):  
Impact Damage ◽  
Failure Surface ◽  
Pilot Project ◽  
Tensile Failure ◽  
Composite Joints ◽  
Adhesively Bonded ◽  
Low Velocity ◽  
Bonded Composite ◽  
Shear Cracking ◽  
Edge Damage

A pilot project has been carried out to investigate the effect of impact on single-lap bonded composite joints based on AS4-8552 laminates and Cybond BR4535A adhesive. Low velocity impacts at an energy level sufficient to cause barely visible impact damage, were conducted on single lap joint specimens at different joint positions. Impact caused delaminations in the upper and lower laminates and localised through-thickness cracking in the adhesive. Residual tensile joint strengths of the impacted joint specimens with near-edge damage were reduced to approximately 50% of the un-impacted value. Failure surface inspections revealed localised through-thickness adhesive shear cracking as a governor of the original impact delamination pattern in the laminates and laminate delamination as the cause of ultimate tensile failure.

Mixed-Mode Fracture of Adhesively Bonded CF/Epoxy Composite Joints

1996 ◽  
Vol 30 (11) ◽  
pp. 1248-1265 ◽  
Author(s):  
Hamid Reza Daghyani ◽  
Lin Ye ◽  
Yiu-Wing Mai
Keyword(s):  
Mixed Mode ◽  
Epoxy Composite ◽  
Mixed Mode Fracture ◽  
Composite Joints ◽  
Adhesively Bonded ◽  
Mode Fracture
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