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...Stress normal direct shear mechanics of materials study internal effects caused by external loads considers real bodies that deform statics assumes no deformation main concerns strength will it stiffness stability defined as the intensity an force forc in equation form e note scalar just a number area vector quantity with magnitude and direction tensor has well plane is first subscript second component use method sections to consider rectangular bar axial load we cut section through now whole surface resisting acting therefore called symbol for sign convention positive tension negative compression example determine concrete pilar...