Dr. B, i have a question. To calculate the maximum value of the subsurface shear stress, you multiplied the contact pressure with the poisson's ratio or is it always going to be 0.3? Why couldnt it be 0.33?
Good question. The value of 0.3 is as a result of stress transformation equations, not poison ratio. Figure 9.15 in the booklet illustrates how the value of the subsurface shear stress varies with the distance below the surface and that the maximum is ~0.3p0.
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the demon within me lusts for more than machine elements knowledge
If we have to calculate factor of safety for given materials, then how can we calculate it?
Could you tell me in which book did u find the equations?
The book is Fundamentals of Machine Component Design by Juvinal and Marshek
Dr. B, i have a question. To calculate the maximum value of the subsurface shear stress, you multiplied the contact pressure with the poisson's ratio or is it always going to be 0.3? Why couldnt it be 0.33?
Good question. The value of 0.3 is as a result of stress transformation equations, not poison ratio. Figure 9.15 in the booklet illustrates how the value of the subsurface shear stress varies with the distance below the surface and that the maximum is ~0.3p0.