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2015+ Shelby GT350 Mustang
GT350 SHW Composite Brake Discs
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<blockquote data-quote="DHG1078" data-source="post: 14563765" data-attributes="member: 65442"><p>You are so close here it's painful. You are correct in that drilling does add stress to the rotors and isn't great for longevity under heavy use. You are missing one key point. The holes ARE the stress risers. Holes, along with imperfections within the material itself, prevent dislocation movement (dislocations are small angular distortions within the materials crystal latice and can move through a material when a force/stress is applied) within the material. Because dislocations can't move through the cross-drilled holes, and thus must move around them, you have a much higher dislocation density (and thus stress density) immediately around the holes than anywhere else. This is why cross-drilled rotors are notorious for cracking around the holes. Casting the holes in eliminates stress (and dislocations) caused by the drilling operation which helps, but you can't eliminate the stress risers without eliminating the holes. At least not with todays tech.</p><p></p><p>+10 internetz for using the term "stress risers" though.</p></blockquote><p></p>
[QUOTE="DHG1078, post: 14563765, member: 65442"] You are so close here it's painful. You are correct in that drilling does add stress to the rotors and isn't great for longevity under heavy use. You are missing one key point. The holes ARE the stress risers. Holes, along with imperfections within the material itself, prevent dislocation movement (dislocations are small angular distortions within the materials crystal latice and can move through a material when a force/stress is applied) within the material. Because dislocations can't move through the cross-drilled holes, and thus must move around them, you have a much higher dislocation density (and thus stress density) immediately around the holes than anywhere else. This is why cross-drilled rotors are notorious for cracking around the holes. Casting the holes in eliminates stress (and dislocations) caused by the drilling operation which helps, but you can't eliminate the stress risers without eliminating the holes. At least not with todays tech. +10 internetz for using the term "stress risers" though. [/QUOTE]
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