Experimental Model Validation and Fatigue Behaviour of Cold-Formed High Strength Steel

Proceedings

Talemi, R. H.¹  Gothivarekar, S.²  Coppieters, S.³  Debruyne, D.⁴ 

[1] Author to whom correspondence should be addressed.;Department of Materials Engineering, KU Leuven, 3001 Leuven, Belgium;Mechanics of Materials, Products and Processes (MeM2P), KU Leuven, 9000 Gent, Belgium;Presented at the 18th International Conference on Experimental Mechanics, Brussels, Belgium, 1–5 July 2018.

关键词: cold-forming process;    Stereo DIC;    numerical modelling;    HSS;    fatigue;   

DOI  :  10.3390/ICEM18-05200

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

In the present paper, fatigue fracture behaviour of cold-formed High Strength Steel (HSS) S690QL are investigated. S690QL is often employed, in a pre-deformed state, for load-bearing applications, where cyclic service loads can be critical. Bending processes can induce residual plastic strain in bent areas and this changes the fatigue behaviour significantly. Traditional uniaxial dogbone testing cannot represent this multi-axial phenomenon properly and for this purpose a benchmark specimen is proposed, that is first bent and after subjected to fatigue loading. The bending process is modelled with a quasi-static Finite Element (FE) model, performed in the commercial code Abaqus. To validate the numerical model, a stereo Digital Image Correlation (DIC) set-up is used, capable of measuring the residual plastic strains in the specimen. The present article covers the validation of a cold-forming process followed by a preliminary fatigue analysis of S690QL.

【 授权许可】

CC BY