Effect of punching and stress concentrations on mechanical behaviour of electrical steels

Dennis Van Hoecke,Emmanuel Attrazic,Lode Vandenbossche,Sigrid Jacobs,Bastien Weber

doi:10.3390/wevj6030741

Dennis Van Hoecke, Emmanuel Attrazic + Show 3 more

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https://doi.org/10.3390/wevj6030741

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Abstract

ArcelorMittal supplies advanced mechanical and magnetic material data for its iCAReTM line of electrical steels to enable customers to optimise the design of their e-machines . This paper gives an overview of the experimental methodologies to assess the effect of stress concentrations and punched edges on the fatigue behaviour of thin gauge electrical steel sheets. The link between the mechanical properties and the microstructural and metallurgical features of the different materials is discussed.

Highlights

As previously reported in EVS presentations, ArcelorMittal has a specific electrical steel product line that optimises the performance of automotive traction electrical machines [1]
This paper presents the methodologies which were developed for the advanced mechanical characterisation of electrical steels as well as the obtained results on the effect of punching and stress concentration on the fatigue properties of thin gauged electrical steels
For non-notched samples and a load ratio of 0.1, the guideline [4] predicts an endurance limit of 470 MPa. This prediction is based on the ultimate tensile strength of the material but is well in line with the experimentally determined fatigue limit of 464 MPa

Summary

Introduction

As previously reported in EVS presentations, ArcelorMittal has a specific electrical steel product line that optimises the performance of automotive traction electrical machines [1]. The machines used in automotive traction already have been going through several optimisation steps, in the consecutive generations of hybrid vehicles on the market. These optimisation cycles had to answer more stringent requirements in power density and cost reduction. Machine design is switching from a pure electromagnetic design with simplified mechanical constraints towards a coupled electromagnetic and mechanical design approach

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