It has been several years since i last worked on strength of materials,

and i can't be certain of what seem to be a simple problem:

Suppose i have a rectangle block. Inside the block is a rectangle cavity

with the long side horizontal. Consider the secanarios whereby the

interior cavity is rotated 30, 45 , 60 and 90 degrees. In which case is

the compressive strength the highest?

Since the max shear is at 45 degrees, the weakest block should be the

one with the cavity align at 45. Right? And 30 and 60 should be the same??

philip

- posted 17 years ago