Structural Shear Joints: Analyses, Properties and Design for Repeat Loading
18 Analysis of Fastener Tension and Clamping Strain
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Closed-form expressions for the average fastener tension and clamping strain are derived. The equations relate average clamping state parameters to fastener and panel material properties, thicknesses and diameters. They account for the compliance of the panels and non-uniform fastener head deformation.
The Model. The generation of the clamped condition in a shear joint can be modeled as a 2-step process using a system of linear springs arranged in series and parallel, as shown in Figure 18.1.The first step is the tensile loading of the fastener shank (minus fastener heads) until the nominal value of the axial (clamping) strain is reached. The second step is the transfer of load to the panels and the two fastener heads which are compressed allowing the fastener shank to partially relax.