Strain measurement in the wavy-ply region of an externally pressurized cross-ply composite ring
- California Polytechnic State Univ., San Luis Obispo, CA (United States). Dept. of Mechanical Engineering
- Hercules Materials Co., Magna, UT (United States)
Ply-level strains are determined in the cross-section of an externally pressurized cross-ply (3:1 circumferential to axial fiber ratio) graphite-epoxy ring containing an isolated circumferential wavy region. A special test fixture was used which permitted measuring orthogonal displacement components in the wavy area using moire interferometry as the pressure was increased. Strain components were determined at selected locations in the wavy area up to approximately90% of failure pressure. The study shows: (1) large interlaminar shear strains, which are non-existent in the perfect ring, are present near the wave inflection points; (2) the wavy plies generate increased interlaminar normal compressive strains in both circumferential and axial plies along a radial line coinciding with maximum wave amplitude; and (3) nonlinear strain response begins at approximately 60% of failure pressure.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 413231
- Journal Information:
- Journal of Engineering Materials and Technology, Vol. 118, Issue 3; Other Information: PBD: Jul 1996
- Country of Publication:
- United States
- Language:
- English
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