例文
- The shape of the contact area between the tube and the external force matter a lot . ( Consider force F applied by the blades of a bolt cutter, vs . the same force applied by a vise . ) To the lowest order and in the limit of thick walls ( t ~ d / 2 ), the compression deformation would be on the order of ( F / lE ) where l is the length of the contact patch and E is Young's modulus of the material of the pipe.
