1.1. An element of an orthotropic lamina made of T300/5208 carbon/epoxy material is subjected to a positive off-axis shear stress, xy, at an angle =45 as shown in Figure Q1(a) below. Determine the value of the off-axis shear stress xy that would cause failure according to the maximum stress criterion. Strength values can be found from Table Ql below. 1.2. Repeat the above if the off-axis shear stress is negative (=45), as shown in Figure Q1(b) below. Figure Q1. Off-axis shear test of a unidirectional lamina specimen. (a) Positive xy at =45 and resulting stresses along 1,2 axes and (b) negative xy at =45 and resulting stresses along 1,2 axes. Table Q1. Typical Values of Lamina Strengths for Several Composites at Room Temperature