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Modeling of Ultra High Strength Steel Sandwiches with Lightweight Cores
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0001-7895-1058
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0001-5218-396X
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0003-0910-7990
2019 (English)In: Hot sheet metal forming of high-performance steel: Proceedings / [ed] Mats Oldenburg, Jens Hardell, Daniel Casellas, Wissenschaftliche Scripten , 2019, p. 313-320Conference paper, Published paper (Refereed)
Abstract [en]

Legislation, du to greenhouse gas emissions, is forcing the automotive industry to reduce emissions and energy consumption. High-performance lightweight materials and structures are essential for meeting these demands. In this work, two types of lightweight sandwich materials are investigated and developed; one intended for crash applications (Type I) and another for stiffness applications (Type II). In order to predict the final properties of the sandwich materials, numerical modeling strategies are established. To achieve reasonable computational time, homogenization is adopted to overcome the complex core geometries of the sandwich materials. Type I, based on press-hardened boron steel, consists of a perforated core between two face plates. Evaluation of energy absorption during crash is conducted by utilizing numerical deformation models of a hat-profile geometry. The intention is to compare the energy absorption of the hat-profile based on the Type I sandwich to a hat-profile based on solid steel with equivalent weight. Type II, based on press-hardened boron steel, consists of a bidirectionally corrugated core between two face plates. The geometry of the bidirectional core requires a large amount of finite elements for precise discretization, causing impractical simulation times. This is adressed by suggesting an equivalent material formulation, to reduce the computational time. The results from Type I indicate an increased specific energy absorption capacity of 20 % as compared to solid steel. From the equivalent material procedure of Type II, it is found that the computational cost is reduced by 95 % with a maintained accuracy for structural stiffness. Validation is carried out by subjecting the sandwich to three-point bending. Good agreement is found between numerical and experimental data. Thus, this work shows that sandwich materials are an interesting and promising approach for reducing weight of vehicle components while maintaining performance, in terms of stiffness and crashworthiness.   

Place, publisher, year, edition, pages
Wissenschaftliche Scripten , 2019. p. 313-320
Series
CHS²-series ; 7
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-75752OAI: oai:DiVA.org:ltu-75752DiVA, id: diva2:1346926
Conference
7th International Conference on Hot Sheet Metal Forming of High Performance Steel (CHS² 2019), 2-5 June, 2019, Luleå, Sweden
Available from: 2019-08-29 Created: 2019-08-29 Last updated: 2023-09-05Bibliographically approved

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Kajberg, JörgenJonsén, Pär

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