Exercise on composites << please. this is going to be in my exam!!!!! PLEASE. I really need this! (im preparing the course by myself and have no one to ask to!!!! a hose in a high-pressure water-jet cleaning system is to be made of a glass-reinforced polyethylene composite material,with continious fibers (Vf=0.4) orientated in the hoop direction. The hose has a external diametre of 20 mm and a wall thickness of 2mm. The water pressure during operation is 10 MPa. Calculate the percentage increases in lenght and diametre of thehose when it is pressurized I did that and I got that the hoop stress was 50 MPa and the axial one 25 Mpa. The strain in length due to axial stress is 1.68% and in the diametre 0.16%. Estimate the stress level in the glass fibers when the hose is under pressure this is what I don't get!!!! I got aprox 150 Mpa but it's wrong.