ESDU 79016
Inelastic shear stresses and strains in the adhesives bonding lap joints loaded in tension or shear.
Abstract:
ESDU 79016 presents a method for the analysis of the inelastic shear stress and strain distributions in the adhesives bonding multi-step lap joints loaded in tension or shear. The method is based on a shear lag analysis and is concerned with the internal cohesion of the adhesive rather than with its adhesion to the adherends. It does not consider joint bending or stress concentrations in the adherends and it is relevant to joints where normal tension (peel) and bending effects are small, for example balanced double lap joints with rigid adherends rather than single lap joints or flexible double lap joints for which it underestimates the stresses.
The analysis is provided as ESDU Toolbox App 79016, an interface to program ESDUpac A79016. The input data required and output data given are fully explained with examples, test cases are provided, a comparison is made of the results obtained with experimental data, and graphs constructed using the program illustrate the effects of changing geometry, loading and the adherend material.
A computer program for the elastic analysis of flexible multistep joints is available with ESDU 80039.
Format: PDF, with software and interactive graphs.
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Details:
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This Data Item is complemented by the following software:
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| ESDU 79016 Toolbox Run |
This program is only available to subscribers. |
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ESDUpac A79016 |
This program is only available to subscribers. |
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ESDUpac A7916 |
This program is only available to subscribers. |
The graphs listed below are available only to subscribers.
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This Data Item contains 6 interactive graph(s) as listed below.
| Graph | Title |
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| Figure 1 | Adhesive shear stress-strain curves |
| Figure 4 | Strain curves for multi-step joints |
| Figure 5 | Strain curves for multi-step joints |
| Figure 6 | Strain curve for a four-step tapered double lap joint |
| Figure 7 | Stress curves for a six-step lap joint illustrating the effect of varying the adherent moduli, E1 and E2 |
| Figure 8 | Strain curves for a single-step lap joint loaded in shear |