Location

La Jolla, CA

Start Date

1-1-1998 12:00 AM

Description

The purpose of the present study was to carefully document the early stages of fatigue damage in flush head riveted Alclad 2024-T3 aluminum alloy panel specimens. The fatigue cracks originate and initially propagate below the surfaces that are observable by optical and electron microscopy. Acoustic microscopy images such cracks and was employed to follow the observable sub-surface growth of fatigue cracks. In addition the cracks were monitored on the observable surface by optical and electron microscopy both in-situ and ex-situ during and after the test was completed. Careful fractographic analysis of the fracture surfaces was also done and correlated with the microscopic observations. The specimens used in this study were fabricated according to the specifications for the fuselage of an aircraft, and these specimens were not precracked or notched.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

17B

Chapter

Chapter 6: Materials Characterization

Section

Fracture and Cracks

Pages

1581-1588

DOI

10.1007/978-1-4615-5339-7_205

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Acoustic, Electron and Optical Microscopy Visualization of Surface and Sub-Surface Cracks

La Jolla, CA

The purpose of the present study was to carefully document the early stages of fatigue damage in flush head riveted Alclad 2024-T3 aluminum alloy panel specimens. The fatigue cracks originate and initially propagate below the surfaces that are observable by optical and electron microscopy. Acoustic microscopy images such cracks and was employed to follow the observable sub-surface growth of fatigue cracks. In addition the cracks were monitored on the observable surface by optical and electron microscopy both in-situ and ex-situ during and after the test was completed. Careful fractographic analysis of the fracture surfaces was also done and correlated with the microscopic observations. The specimens used in this study were fabricated according to the specifications for the fuselage of an aircraft, and these specimens were not precracked or notched.