The curve just minimises the impact a little because the shaft doesn't hit the surface of the shield perpendicularly (meaning with maximal impact force). What makes a shield good, is the material that it is made of and the thickness of it. The thicker and better the material (meaning the molecules and atoms composing the material are more closely packed together), the more difficult it is to penetrate the shield. And penetration has to do with the energy given to the shield by the impact. The more the energy (meaning more force of impact) is delivered to the shield, the greater the chance the shield will break (meaning the molecules will be "freed" of the bonds that bind them together) upon impact.
Maion
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