Determination of Flaw Growth Characteristics of Ti-6Al-4V Sheet in the Solution-Treated and Aged Condition

The specific experimental investigation undertaken was designed to answer these questions on Ti-6Al-4V in the solution treated and aged condition. The defect growth and fracture characteristics were studied in parent (unwelded) and welded sheet material. The results of the study indicate that cryogenic proof testing will screen smaller size defects than proof testing at ambient conditions. However some unusual crack growth behavior during the proof test simulation suggests that some further study be made of stress and time duration effects

The fatigue behavior of materials for the supersonic transport

Crack propagation behavior, residual static strength, and base fatigue strength of supersonic transport skin materia

Stress Concentrations: Their Effect on Design for Repeated Loading

Changes of section, such as fillets, grooves, oil holes, keyways, and the like, are necessary in many machine parts. These are sources of stress concentration when a part is under load, Stress concentrations may also occur near bolts, pins, rivets, spot welds, and other discrete fasteners in joints of structural members. Flaws, inclu-sions, and other discontinuities in a metal may also interrupt the stress pattern under load. The general term "stress raiser" has been coined to describe any such irregularity or inhomogeneity which produces it local concentration of stress in a loaded part

An experimental and theoretical investigation of plane-stress fracture of 2024-T351 aluminum alloy

Plane-stress fracture behavior of precracked aluminum alloy

Fatigue Strengths of Aircraft Materials: Axial-Load Fatigue Tests on Edge-Notched Sheet Specimens of 2024-T3 and 7075-T6 Aluminum Alloys and of SAE 4130 Steel with Notch Radii of 0.004 and 0.070 inch

The present report gives results of axial-load fatigue tests on notched specimens of three sheet materials: 2024-T3 and 7075-T6 aluminum alloys and normalized SAE 4130 steel. Two edge-notched specimens were designed and tested, each having a theoretical stress-concentration factor K(sub t) = 4.0. The radii of the notches were 0.004 and 0.070 inch. Tests of these specimens were run at two levels of nominal mean stress: 0 and 20,000 psi. Results of these studies extended information previously reported on tests of specimens with varying notch severity. They afford data on the variation of fatigue-strength reduction with notch radius and on the potential usefulness of Neuber's technical stress-concentration factor K(sub n)

Fatigue behavior of materials for the sst - electron fractographic studies final report

Electron microscopic fractography to determine fatigue behavior of materials for supersonic transport - titanium, aluminum, molybdenum, and vanadiu