In SpaceClaim, create an XY plane by clicking on the Z axis. Select that plane and start a Sketch. Use the construction line tool to draw a 100 mm line at the center of the plate. draw a 5 mm construction line from the center of that first line 90 degrees to it on one side. Repeat for the other side. Select the 3 point curve tool. Click on one end of the 100 mm line, then the other end, then the 5 mm end. Repeat for the other side. Exit the Sketch. Use the Project button. Select the two curves, then your curved surface. Finally, delete the surface created by the Project and you have a crack.
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