1 ( 35% ) A helically wound fiber-reinforced cylindrical pressure vessel is subjected to an internal pressure of 1.0 MPa . The cylindrical shell has an inner radius of 100 mm and a wall thickness of 1 mm . The strengths of the composite material are: x_(t)=x_(c)=1500MPa,Y_(t)=80MPa,Y_(c)=190MPa and S=75MPa. Determine if failure has occurred on the cylindrical wall according to the Tsai-Hill Failure Criterion.