Improved shear test fixture using the Iosipescu specimen

Jen Y. Liu, Dwight D. Flach, Robert J. Ross, Gary J. Lichtenberg

Research output: Contribution to journalConference articlepeer-review

11 Scopus citations


This paper describes a new shear test fixture designed with the Iosipescu specimen geometry. The special feature of the design is the introduction of four pairs of shafts that connect two controlling blocks to both halves of the fixture. The shafts run on ball bushings and serve to eliminate any misalignment of the fixture halves without preventing them from moving nonlinearly in the plane of loading during testing. The new test fixture was used to conduct shear strength tests on Sitka spruce specimens. The results showed that shear failure always occurs in earlywood. There is only a weak relationship between shear strength and slope of grain.

Original languageEnglish (US)
Pages (from-to)139-147
Number of pages9
JournalAmerican Society of Mechanical Engineers, Applied Mechanics Division, AMD
StatePublished - Dec 1 1999
EventMechanics of Cellulosic Materials - 1999 (ASME Joint Applied Mechnics and Materils Division Meeting) - Blacksburg, VA, USA
Duration: Jun 27 1999Jun 30 1999


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