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Journal of Failure Analysis and Prevention

, Volume 19, Issue 1, pp 182–192 | Cite as

Enhanced Failure Load Bearing in Adhesively Bonded Strap Repairs: Numerical Analysis and Experimental Results

  • Mohammad Ali Saeimi SadighEmail author
Technical Article---Peer-Reviewed
  • 23 Downloads

Abstract

Adhesively bonded repairs are frequently used to repair aluminum structures due to their attractive options compared to traditional methods such as welding or riveting. A new method of increasing the repair’s strength against uniaxial tensile loads is used in this study. For this purpose, standard single-strap (SS) and double-strap (DS) repairs were produced with aluminum patch. In the first step, an epoxy-based adhesive was employed to create SS and DS repairs using neat adhesive and 0.5 wt.% reduced graphene oxide (RGO)-reinforced adhesive. Afterward, samples of SS and DS joints with the reinforced adhesive were manufactured to study the effect of the added RGO. Uniaxial tensile tests were conducted and above 30% enhancement in the ultimate load was observed in the joints bonded with reinforced adhesive. The repaired joints were analyzed by finite element (FE) method using cohesive zone modeling technique to obtain failure loads. For this purpose, two sets of tests (a) double cantilever beam and (b) end notch flexure tests were implemented to estimate the cohesive zone model CZM parameters. Comparing the results obtained from experiments and the numerical simulations shows that FE models accurately predict the failure load in the reinforced and unreinforced repaired joints.

Keywords

Patch repair Adhesive Cohesive zone model RGO 

List of symbols

B

Specimen width

D

Diagonal matrix

I

Identity matrix

GIIC

Energies released (mode II)

GIC

Energies released (mode I)

p

Applied load

TI

Maximum normal nominal stress

TII

Maximum shear nominal stress

δ

Vector of relative displacement

δi

Current damage relative displacement in mode I

δo,i

Onset damage relative displacement in mode II

υ

Poisson’s ratio

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Copyright information

© ASM International 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringAzarbaijan Shahid Madani UniversityTabrizIran

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