# Homework Help: Question about thick walled cylinder

1. Oct 22, 2011

### spree

Hi. I'm a third year ME student and I am confused about something. I've just started to take ME design course this semester and this is from my first hw. I solved everything but i dont know about the shear stress. since there is no torsion I wanna say there is no shear stress but i doubt that if it was the case why would the teacher ask about it detailed like this. Any help would be appreciated. thanks.

''A thick walled open ended cylinder is made of steel ( E = 200 GPa) has an inside diameter of 80 mm and an outside diameter of 100 mm. The cylinder is subjected to an internal pressure of 20 MPa. Determine the stress components sigma(r), sigma(t) sigma(l) and the maximum shearing stress at the inner and outer surfaces of the cylinder and at r = 45 mm.''

2. Oct 22, 2011

### nvn

spree: Because the cylinder is open ended, what does that tell you about sigma_L?

Can you compute the cylinder principal stresses? Let, e.g., sigma_x = sigma_t, and sigma_y = sigma_r. After you compute the principal stresses, put them in this order; sigma1 > sigma2 > sigma3. After that, look up the formula for maximum shear stress. You must post relevant equations yourself. See the homework template.

3. Oct 23, 2011

Hi,