Determination of in-plane and out-of-plane shear moduli of composite materials

C. L. Tsai*, I. M. Daniel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


A general closed-form relationship was derived between torque and angle of twist for a prismatic composite specimen in terms of the geometric parameters and shear properties of the laminae. In the case of unidirectional laminates, relations are expressed in terms of three principal shear moduli, G12, G23 and G13. An experimental method was developed for determining these moduli by measuring surface and edge strains with strain gages. Unidirectional coupons of graphite/epoxy and silicon carbide/glass ceramic were tested in torsion and the three shear moduli were determined in each case.

Original languageEnglish (US)
Pages (from-to)295-299
Number of pages5
JournalExperimental Mechanics
Issue number3
StatePublished - Sep 1990

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering


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