For the purpose of improving the accuracy of the Iosipescu shear test method, researchers have been interested in analyzing the uniformity of shear stress distribution along the notched cross section for different design configurations of specimens made of various materials. But a one-factor-at-a-time approach cannot lead to a full understanding of the shearing behavior. The statistical design of experiments based on finite element models is employed here to characterize impacts of main effects and interactions among various design factors on the uniformity of shear stress distribution along the notched cross section for two kinds of unidirectional laminae with different orthotropy: Boron/Al (boron-fiber-reinforced aluminum) and Gl/Epoxy (glass-fiber-reinforced epoxy). It is shown that (a) the notch radius and height of a specimen are significant factors, (b) the notch angle is also significant, and 90° is better than 110° in reducing the variation of shear stress distribution, and (c) some two-factor interactions are influential.
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