Explanipedia

The Effect of Hole Quality on the Fatigue Life of 2024-T3 Aluminum Alloy Sheet Open

R. A. Everett · 2004

This paper presents the results of a study whose main objective was to determine which type of fabrication process would least affect the fatigue life of an open-hole structural detail. Since the open-hole detail is often the fundamental b…

A Novel Approach to Rotorcraft Damage Tolerance Open

Scott C. Forth, R. A. Everett, John A. Newman · 2002

Engineering Computer science Materials science

Damage-tolerance methodology is positioned to replace safe-life methodologies for designing rotorcraft structures. The argument for implementing a damage-tolerance method comes from the fundamental fact that rotorcraft structures typically…

Review of fatigue and fracture research at NASA Langley Research Center Open

R. A. Everett · 1988

Engineering Materials science Physics

Most dynamic components in helicopters are designed with a safe-life constant-amplitude testing approach that has not changed in many years. In contrast, the fatigue methodology in other industries has advanced significantly in the last tw…

Effect of Adherend Thickness and Mixed Mode Loading on Debond Growth in Adhesively Bonded Composite Joints Open

P.D. Mangalgiri, W Steven Johnson, R. A. Everett · 1987

Materials science Engineering Biology

Symmetric and unsymmetric double cantilever beam (DCB) specimens were tested and analyzed to assess the effect of: (1) adherend thickness, and (2) a predominantly mode I mixed mode loading on cyclic debond growth and static fracture toughn…

Geometrically Nonlinear Analysis of Adhesively Bonded Joints Open

B. Dattaguru, R. A. Everett, John Whitcomb, W Steven Johnson · 1984

Materials science Physics Engineering

A geometrically nonlinear finite-element analysis of cohesive failure in typical joints is presented. Cracked-lap-shear joints were chosen for analysis. Results obtained from linear and nonlinear analysis show that nonlinear effects, due t…

The role of peel stresses in cyclic debonding Open

R. A. Everett · 1982

Materials science Engineering Philosophy

When an adhesively bonded joint is undergoing cyclic loading, one of the possible damage modes that occurs is called cyclic debonding - progressive separation of the adherends by failure of the adhesive bond under cyclic loading. In most p…

Effect of service usage on tensile, fatigue, and fracture properties of 7075-T6 and 7178-T6 aluminum alloys Open

R. A. Everett · 1975

Materials science Engineering

A study has been made to determine the effects of extensive service usage on some basic material properties of 7075-T6 and 7178-T6 aluminum alloy materials. The effects of service usage were determined by comparing material properties for …

Debond propagation in composite reinforced metals Open

G. L. Roderick, R. A. Everett, John H. Crews · 1974

Materials science

Strain energy release rates were used to correlate cyclic debonding between metal sheets and composite reinforcement. An expression for the strain energy release rate was derived and applied to fatigue test results for three material syste…

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