Damage Characterization in Stitched Carbon/epoxy Laminates Subjected to Monotonic and Cyclic Loadings

Abstract

Damage in stitched composites appears in the form of transverse crack, delamination, stitch-induced defects and fiber breakage. In monotonic tensile case, acoustic emission testing is performed to determine the damage onset. Interrupted test is then carried out to detect the growth of damage. X-ray radiography is employed to capture the progressive damage. Quantification of crack density and delamination area is performed based on the X-ray images. In tension-tension cyclic case, fatigue test is halted at progressive cycles, and the damage progress is captured. Comparison of the damage mechanism in unstitched, moderate-stitch density and high-stitch density laminates is presented. Effect of stitch densities on the damage onset and growth is discussed. Fatigue life of stitched laminates under fatigue loading is also evaluated.

Department(s)

Mechanical and Aerospace Engineering

Keywords and Phrases

Carbon/epoxy laminates; Damage; Fatigue; Stitch

International Standard Book Number (ISBN)

978-888878533-2

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2025 CERTH - Information Technologies Unit, All rights reserved.

Publication Date

01 Jan 2012

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