I am having trouble with the following problem:
1) An element of a lamina is subjected to normal and tangential stresses on each of its four sides. The associated stress matrix is
Calculate the principal stresses, given that each principal stress,
satisifies det( )=0
The question also had this diagram which i don't understand what is suppose to represent?
I started finding the det for A, however what should i do next?
det(A) = 12*15- -8*-8
det(A) = 180-64
det(A) = 116