Feasibility study of a modified ASTM D 143 block shear specimen for thin material

The feasibility of using a modified block shear specimen for shear tests of thin material was determined by comparing matched sections of modified and standard (ASTM D 143) clear Sitka spruce block shear specimens. The modified block shear specimen was composed of three laminated plies, 5/16, 7/8, and 13/16 inch thick. The modified specimen tended to have slightly higher shear strength values than the standard specimen, but the difference was not significant. The modified block shear specimen provides an acceptable alternative to the standard ASTM D 143 block shear specimen for evaluating the parallel-to-grain shear properties of thin material.

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