bearing surface for polar steel insert 



Figure E-3. Cracks in the beveled bearing surface of the polar acrylic plastic pentagon 

 viewed at a right angle to the cut through the bearing surface. Capsule 

 failed after 1,575 minutes of sustained loading at 3,000 psi. 



Figure E-4. Cracks in the beveled bearing surface of the polar acrylic plastic 

 pentagon viewed at a right angle to the cut through the bearing 

 surface. Capsule failed after 23 minutes of sustained loading 

 at 4,000 psi. 



200 



