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  • Create Date January 27, 2023
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Industrial user guideline to effectively predict edge-cracking in Advanced High Strength Steels

Advanced High Strength Steels (AHSS) are the dominant material choice for lightweight construction in the automotive and transport sector. The main drawback of new developments of AHSS is that the high strength achieved in these steel grades is usually associated with limitations in cracking resistance and formability. As a result, during their processing, unexpected defects (cracks, stretching, thinning, etc.) can occur, not easy to predict using traditional experimental or computational approaches at the product design stage. 

Thereby, the use of new AHSS grades has brought new challenges to the sheet manufacturing sector: the need for accurate characterization techniques to avoid sheet cracking occurrence during forming and the digitalisation of forming process to improve the detection of cracks and defects and assure part quality. 

The main objective of this document is to provide an industrial user guideline for a more efficient edge-cracking prediction in the high-strength sheet metal industry. 

This guideline describes a series of state-of-the-art and innovative lab tests methodologies, edge-cracking models, in-line process monitoring and machine  learning techniques to characterize and predict the sheared edge formability of advanced high strength steels (AHSS). It compiles relevant findings from research developed in the frame of the CuttingEdge 4.0 project and previous research projects. The document includes a list of material properties of the AHSS grades studied in the project as well as recommendations to be applied during the planning, design, and operational phases of the manufacture of AHSS sheets and components to avoid edge-cracking problems.