A large flat plate with a central crack experiences a nonuniform normal stress. The crack face traction

function can be represented by the function given below. Where $p_0=300$MPa and $=25mm.$ The origin

$(x=0)$ is at the left crack tip, as illustrated in the figure. Using the weight function method, $($a$)$ Determine

values for $K$ ranging from $10,20,$dots,$100mm.($b$)$ plot $K_{\text{I}}$ versus crack length.

$p(x)=p_0{e}^{-\frac{x}{}}$