Modelling considerations for stress intensity factor solutions at pin-loaded holes

摘要

This work summarizes investigations into stress intensity factor solutions for straight, through cracks at pin-loaded holes in thin sheets. As shown in this work, several assumptions contribute to the fidelity of a stress intensity factor solution that includes the distribution of contact pressure on the pin-hole interface, the friction coefficient at the pin-hole interface, the crack initiation angle, and stiffness mismatch. These assumptions lead to higher or lower stress intensity factor solutions as demonstrated by results generated from advanced finite element analyses of the relevant geometries. Results shown here contribute to the development of a realistic and conservative set of assumptions for stress intensity factor solutions. Conclusions drawn from this work are applicable to cracks originating at pin-loaded holes in plates and lugs.