Quasi-static and Fatigue Strength of Helically Wrapped Structures

A Helically wrapped structure is a hollow pipe structure that is made from a metal strip and the overlapping interfaces are adhesively joined. It is yet unknown how to determine the quasi-static strength and predict the fatigue life of this structure. A method was developed to determine whether either the adherend or the adhesive is critical to...

Fatigue Crack Growth in Solid Round Metallic Bars with a Shoulder Fillet

Solid round bars with a shoulder fillet are frequently used in engineering structures because it facilitates a smooth transition in thickness. However, the presence of shoulder fillets is currently neglected in the prediction of fatigue crack growth in engineering practice. Since stress concentrating locations like a shoulder fillet can have a...

Delamination of Bonded Repairs: A Damage Tolerance Approach

A model was developed for delamination growth in bonded repair patches under constant amplitude fatigue loading. The model used the finite element method, employing the virtual crack closure technique, to determine the strain energy release rate (SERR) as a function of delamination length. Interaction effects between multiple delaminations, and...