Fatigue damage in centrally notched GR/EP laminates

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Experimental Mechanics; (USA)

DOI:https://doi.org/10.1007/BF02321505· OSTI ID:5900433

Jen, M H.R.; Hsu, J M; Lee, C H ^[1]

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1. National Sun Yat-Sen University, Kaohsiung (China)

An investigation is presented of the fatigue properties of graphite/epoxy T300/5208 composite laminates of 16 plies with a central circular hole subjected to tension-tension constant-stress amplitudes at low humidity and room temperature. Four types of notched laminates, classified as unidirectional, off-axis, orthotropic shear, and quasi-isotropic, are studied. Some of the laminates were precracked to initiate and guide the crack growth transversely. Experimentally measured S-N curves, crack lengths, and their corresponding growth directions, failure surfaces, delamination areas, and transverse delamination lengths for these composites are evaluated. It is concluded that the precracked specimens have shorter fatigue life and the crack-growth rate predicted by the Paris law can be modified to apply to the effective transverse delamination length. 24 refs.

• OSTI ID: 5900433
• Journal Information: Experimental Mechanics; (USA), Journal Name: Experimental Mechanics; (USA) Vol. 30; ISSN EXMCA; ISSN 0014-4851
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
AMBIENT TEMPERATURE
CARBON
CAVITIES
COMPOSITE MATERIALS
CRACK PROPAGATION
DAMAGE
ELEMENTAL MINERALS
ELEMENTS
EPOXIDES
FATIGUE
GRAPHITE
LAYERS
MATERIALS
MECHANICAL PROPERTIES
MINERALS
MOISTURE
NONMETALS
NOTCHES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
TENSILE PROPERTIES