It is important to evaluate the safety of bolted joints under load eccentricity to a bolt axis.  We examined tapped thread joints, with which a clamped plate is tightened with bolts to a base body, by applying an eccentric load to the bolts.  The structural interface opening between the clamped plate and base body occurs due to the eccentric load based on the principle of leverage.  During the growth of the interface opening, nonlinearity noticeably appears on the tensional and bending components of bolt stress, and these stress components become larger than expected in an early phase before a fatal bolt pull-out occurs.  However, an evaluation method taking into account nonlinearity has not been investigated.  We evaluated the bolt stress of tapped thread joints that took into account the effect of the nonlinearity during the growth of the interface opening.  We conducted experiments and finite element analyses to quantitatively validate the stress under the following conditions: (i) tapped thread joints with the clamped plate thinner than the bolt diameter and (ii) load eccentricity to the bolt axis.  We confirmed that the compression stress of the interface near the one-sided edge support point has an influence on the lever ratio that changes bolt stress components larger than expected.


Influence of Structural Interface Opening of Bolted Joints Under Eccentric Load

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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