SYMPOSIA PAPER Published: 01 January 1990

Composite Shear Moduli and Strengths from Torsion of Thick Laminates


Composite bars of rectangular cross sections are loaded in torsion to determine the principal shear moduli and interlaminar strengths. The use of rectangular cross sections greatly simplifies the fabrication of specimens. In [0], [90], and cross-plied laminates, torsional rigidity depends only on the principal shear moduli and the dimensions of the cross section. Thus, the shear moduli can be determined from the measured torsional rigidity. This procedure proves very accurate and convenient in determining the transverse shear modulus G23. The use of this technique to measure in-plane shear and interlaminar strengths is also discussed in this paper.

Author Information

Kurtz, RD
AFWAL/MLBM, Wright-Patterson Air Force Base, Dayton, OH
Sun, CT
School of Aeronautics and Astronautics, Purdue University, West Lafayette, IN
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: D30
Pages: 508–520
DOI: 10.1520/STP24129S
ISBN-EB: 978-0-8031-5120-8
ISBN-13: 978-0-8031-1287-2