Effect of loading path on stress-strain relation and progressive damage of a polymer matrix composite under tension/torsion biaxial loading

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:89772

Kamada, M; Fujii, T ^[1]; Tanake, T ^[2]

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1. Doshisha Univ., Kyoto (Japan). Dept. of Mechanical Engineering
2. Kobe Steel Co. Ltd., Takasago (Japan)

Strength and stress-strain properties of plain woven glass fabric composites were measured under three different loading paths which gave the same final stress state. Thin-walled tubular specimens were used. In the present study, the progressive damage was focused. In all tests, acoustic emissions (AE) were measured for distinguishing damage accumulation such as debonding, matrix cracking and fiber breakage. Failed specimens were observed using an optical microscope. Based on the experimental results, a new yield criterion for glass fabric composites was proposed. Damage accumulation and its sequence were both affected by loading path. The S-S relations up to failure were affected by biaxial stress ratio {alpha} (the ratio between normal and shear stresses) and loading path. However, the strength did not depend on loading path. The material failure was governed by the final stress condition regardless the difference of loading path.

• OSTI ID: 89772
• Report Number(s): CONF-9409291--; ISBN 1-56676-220-0
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACOUSTIC EMISSION TESTING
COMPOSITE MATERIALS
CRACKS
DAMAGE
EXPERIMENTAL DATA
FIBERGLASS
PHOTOMICROGRAPHY
POLYESTERS
SHEAR PROPERTIES
STRAINS
STRESSES
TENSILE PROPERTIES
TORSION
ULTIMATE STRENGTH
YIELD STRENGTH