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Ultimate yield strength is basically just the force per volume to permanently deform a material, corner damage included. Corner damage is actually worse because it usually involves gouging or cracking, which introduces stress risers that further fracture with much less force. Juxtapose that to stainless steel (e.g. my iPhone 12 Pro)— it has high toughness which is partly due to the material’s yield strength and partly its malleability. My phone weighs something like 2g more than the 15 Pro because less thickness is required.