A frame is formed by two metallic rectangular cross sectional parts soldered along

their inclined planes as illustrated. What is the permissible axial load Pall that can be

applied to the frame, without exceeding a normal stress of $\backslash$sigma all or a shearing stress of

$\backslash$tau all on the inclined plane? Given: a $=10$ mm$,$ b $=75$ mm$,$ t $=20$ mm$,\backslash$theta $=55\backslash$deg $,\backslash$sigma all $=$

$25$ MPa, and $\backslash$tau all $=12$ MPa. Assumption: Material strength in tension is $90$ MPa