Crack patterns follow the principal compressive stress paths Stresses in different segments Segment 4 (at the bottom): =0 and =Omax Vertical flexural crack >Segment B(at the neutral axis): =t max and o=0 45-diagonal crack. >Segment C(between the N.A.and the bottom) Combination of t and o 45°-90°diagonal crackü Crack patterns follow the principal compressive stress paths ü Stresses in different segments Ø Segment A (at the bottom): τ = 0 and  = max Vertical flexural crack. Ø Segment B (at the neutral axis): τ = τ max and  = 0 45-diagonal crack. Ø Segment C (between the N.A. and the bottom): Combination of τ and  45-90 diagonal crack