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Predicting production influences on adhesively bonded joints subjected to cyclic load

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Abstract

Introduction

Tolerances in the design of adhesive joints were determined and their influence on the mechanical behaviour of adhesively bonded steel joints under quasi-static and under cyclic loads was evaluated in this work.

Test preparation and test performance

The paper focuses on adhesive layer thickness, filling ratios, and surface treatments as the main production tolerances. They were varied at different levels. Four different bondline thicknesses, three different filling ratios, and two different surface treatments were investigated. The influence of tolerances was analysed on single-lap shear joints and peel joints. Toughened epoxy-based adhesives were used. Mechanical properties of bonded steel joints were investigated under static load and under cyclic load.

Results

In both load cases, adhesive layer thickness has the highest influence on the resulting shear strength. Peel strength decreased with reduced filling ratios.

Conclusions

The influence of adhesive layer thickness on fatigue could be predicted by shift factors. Furthermore, it was possible to describe the influence of production tolerances in an analytical way. This allows an evaluation of fatigue based on quasi-static tests.

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Abbreviations

f :

Frequency

f :

Number of degrees of freedom

F a :

Load amplitude

F max :

Maximum force

k :

Slope of Woehler curve

l :

Total length

l f :

Free length

l o :

Overlap length

m :

Number of factor levels

n :

Population

N :

Number of cycles

N 10 :

Number of cycles (10 % failure probability)

N 90 :

Number of cycles (90 % failure probability)

P max :

Maximum load of the fatigue cycle

P min :

Minimum load of the fatigue cycle

RT:

Room temperature

R :

Load ratio

s :

Standard deviation

t :

Adherend thickness

t a :

Adhesive layer thickness

T :

Temperature

v :

Velocity

w :

Width

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Acknowledgments

This work was technically and financially supported by FOSTA e.V., Düsseldorf, financed from Stiftung Stahlanwendungsforschung, Essen, Germany.

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Authors and Affiliations

  1. Laboratory of Materials and Joining Techniques, University of Paderborn, Pohlweg 47-49, 33098, Paderborn, Germany

    Dominik Teutenberg & Ortwin Hahn

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  1. Dominik Teutenberg
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  2. Ortwin Hahn
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Correspondence to Dominik Teutenberg.

Additional information

Doc. IIW-2324, recommended for publication by Commission XVI “Polymer Joining and Adhesive Technology”.

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Teutenberg, D., Hahn, O. Predicting production influences on adhesively bonded joints subjected to cyclic load. Weld World 57, 203–213 (2013). https://doi.org/10.1007/s40194-012-0015-1

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  • DOI: https://doi.org/10.1007/s40194-012-0015-1

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