Adjusts the design for the desired probability of success. Fatigue Stress Concentration Factor ( Kfcap K sub f
Combined reversed-bending and steady torsion.
If the shaft features keyways, splines, or sudden steps that cause stress concentrations, the standard requires a in these allowable stress limits. Modern Alternatives to ASME B106.1M Asme B106.1m Pdf
Stiffness, lateral deflections, and critical speeds (vibrations). Designers must check these separately to avoid bearing misalignment or resonance. Current Status:
d=[32⋅nπ(MSe)2+34(TSy)2]1/3d equals open bracket the fraction with numerator 32 center dot n and denominator pi end-fraction the square root of open paren the fraction with numerator cap M and denominator cap S sub e end-fraction close paren squared plus three-fourths open paren the fraction with numerator cap T and denominator cap S sub y end-fraction close paren squared end-root close bracket raised to the 1 / 3 power : Required shaft diameter : Factor of safety : Bending moment at the critical section : Torsional moment (torque) Secap S sub e : Corrected endurance limit of the shaft material Sycap S sub y : Yield strength of the shaft material Adjusts the design for the desired probability of success
Use the ASME formula to solve for the necessary shaft diameter, Verify: Check the design against constraints. Conclusion
Before the introduction of B106.1M, engineers relied on older codes like ASA-B17C-1927. These early methods were often based on the static yield strength of materials, which frequently led to designs that were either overly conservative or dangerously incomplete. As the understanding of mechanical failure evolved, it became clear that approximately 60% of structural failures in rotating machinery were caused by fatigue failure Modern Alternatives to ASME B106
): The standard guides you in calculating this value using raw material data, adjusted for the specific design environment.
If you are a student, do not pay full price. Most accredited engineering universities have a "library standards repository." You can access a PDF of ASME B106.1M for free via the library's VPN.