Power Transmission Shaft under Fatigue Loading Using ASME Code

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Power Transmission Shaft under Fatigue Loading Using ASME Code

Beam Deflection and Stress Calculators Formulas & Structural Analysis

Design of a Power Transmission Shaft under Fatigue Loading Using ASME Code

Based on American Society of Mechanical Engineers (ASME) Standard B106.1M:1985

Abstract

Power transmission shafting is a vital element of all rotating machinery. A complete shaft design involves many iterative phases and fundamental to this is the determination of preliminary dimensions of the shaft. This paper presents a comprehensive fatigue analysis approach of determining the initial dimensions of a power transmission shaft under fatigue loading based on American Society of Mechanical Engineers (ASME) Standard B106.1M:1985. A countershaft running at a constant speed is designed using this approach. Stress analysis at potential critical locations are conducted to determine the shaft sizes. The sizes from these locations are then used to estimate the sizes at low stress locations. Adjacent sizes are blended using the largest size. To help visualize, a CAD model of the preliminary designed countershaft is provided.

Reference Figure 7 Design region and load line for ASME-elliptic and Langer yield theories, for the tensile region (σ_m ≥ 0)

Introduction:

One of the first fundamental facts of which human beings become aware is that nothing lasts forever. Life may come to a sudden end or last longer, but still for only a finite period (Vassilopoulos, 2010). As the industrial arena grows more sophisticated, it seems as though operations are confronting fewer and fewer broken machine shafts. When shafts do break, however, there are almost always as many theories regarding the suspected culprits as there are people involved (EP, 2018). Whether related to motors, pumps or any other types of industrial machinery, shaft failure analysis is frequently misunderstood, often being perceived as difficult and expensive. For most machine shafts, however, analysis should be relatively straightforward. That’s because the failure typically provides strong clues to the type and magnitude of forces on the shaft and the direction they acted in: The failed parts will tell exactly what happened (EP, 2018).

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Reference

Stephen K. Armah
Department of Mechanical Engineering,
North Carolina A&T State University, Greensboro, NC, USA