41. Typical brittle materials like glass do not show any plastic deformation but fail while the deformation is elastic. 42. Plasticity surface friction is also very low in comparison to the plastic deformation energy and can be neglected. 43. In addition, when the stress is independent of this strain rate, the material exhibits plastic deformation . 44. A shear instability arises when heat is produced by plastic deformation faster than it can be conducted away. 45. Excessive contact pressure can lead to a typical bearing failure such as a plastic deformation similar to peening. 46. These materials do show viscous flow is the dominant source of plastic deformation , and is also very slow. 47. One proof is to match the broken halves, which should fit exactly since no plastic deformation has occurred. 48. This is important because plastic deformation raises the temperature of the oil or lubrication fluid and changes the viscosity. 49. Plastic deformation induces a residual compressive stress in a peened surface, along with tensile stress in the interior.50. Another con is that this plastic deformation can cause corresponding high points in the shaft surrounding the circular mark.
