Design of composite plate specimens for measurement of through-the-thickness shear properties in vibration experiments

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:577577

Gagneja, S ^[1]; Gibson, R F; Ayorinde, E O ^[2]

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1. Automated Analysis Corp., Ann Arbor, MI (United States)
2. Wayne State Univ., Detroit, MI (United States)

This research involves the development of an analysis which yielded recommendations regarding the plate thickness at which the effects of transverse shear become significant enough to be taken into consideration during vibration testing of composite plates. The specimens designed using this analysis are to be used for the {open_quotes}inverse{close_quotes} problem of determining through-the-thickness elastic constants as well as in-plane elastic constants from modal vibration response data. The effects of transverse shear were studied over the range of practical plate aspect ratios (length to thickness ratios) and mode numbers. Behavior of composite plates ranging from isotropic to highly orthotropic was studied in order to investigate the effects of transverse shear. Orthotropic plates having in-plane dimensions of 254 x 254 mm and thicknesses varying from 10 mm to 80 mm, with free-free edge boundary conditions, were considered. A methodology was developed to use Finite Element Analysis (FEA) to compare with the results of closed form analytical models. Good agreement between the two analytical models was observed, and graphs were generated for determination of best plate aspect ratios and mode numbers. Keywords: composite plate, transverse shear, elastic constants, vibrations, finite element analysis.

• OSTI ID: 577577
• Report Number(s): CONF-970431--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
99 GENERAL AND MISCELLANEOUS
BOUNDARY CONDITIONS
COMPOSITE MATERIALS
FINITE ELEMENT METHOD
SHEAR PROPERTIES
TESTING
THICKNESS