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Torsional stress is the stress or deformation caused when one end of an object is twisted in one direction and the other end is held motionless or twisted in the opposite direction. Torsion strength is the measure of the ability of a material to withstand that twisting load. (Think axle twist) Ultimate tensile strength of a material is the maximum amount of pulling stress on the material that can be applied before the material fails. In racing, we are constantly searching for methods that can increase the torsional and tensile stress loads that our driveline components can absorb.The manufacturing process can also create high stress in some of the most important points in our cars, regardless of the material strength. Even with the right manufacturing processes in place, fatigue crack failure can occur and generally starts on the surface of the material. Cracks can form easily in areas of high tensile stress because the forces are already working to pull the atoms of the metal apart. |
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