Several failures in centrifugal pump shaft are reported due to backpressure leading to unpredicted shaft failure during pump operation. several attempts have been made by engineers in designing and simulating a centrifugal pump shaft that can offer more enhanced mechanical properties which can withstand backpressure during operation. In this paper, a centrifugal pump shaft with more enhanced mechanical properties is designed to withstand backpressure. This is achieved by simulating the relevant parameters of stress-strain which impacts the system during backpressure. In the current study,  an Auto desk fusion 360 was used to simulate the design shaft relationship  of stress and strain parameters on back pressure intensity. During simulation, the centrifugal pump shaft was constrained on a drive end bearing and a non-drive end bearing by using frictionless constrain parameters at extreme back pressure during operation. The following facts were theoretically revealed after simulating the system with an Auto desk fusion 360 simulation software.  It was observed that, there is extremely low possibility of shaft failure at the keyway slot section and the propagation of failure were invisible in this section of the shaft. When the shaft was subjected to severe stress and strain due to high intensity of backpressure, the material experiences fatigue and the fatigue zone start propagating leading to material defects and failure that were visible observed across the shaft during operation. However, the designed shaft was able to withstand high stress/strain during operation as the new yield stress increases to 207 MPa. The designed simulated shaft was revealed to withstand the subjected backpressure from the system and the possibility of material failure during pump operation was minimize.

Keywords: Design, modelling, stress, strain, centrifugal pump, and backpressure