Question

For the biaxial stress system shown what are the principle stresses?

         1. 50 MPa (tensile)         2. 50 MPa (compressive)         3. 100 Mpa (tensile)    4. Zero

         Select the correct answer the code given below  

         (a) 1 and 2          (b) 2 and 3       (c) 3 and 4       (d) 1 and 4