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Modeling of Ultra High Strength Steel Sandwiches with Lightweight Cores
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.ORCID-id: 0000-0001-7895-1058
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.ORCID-id: 0000-0001-5218-396X
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.ORCID-id: 0000-0003-0910-7990
2019 (Engelska)Ingår i: Hot sheet metal forming of high-performance steel: Proceedings / [ed] Mats Oldenburg, Jens Hardell, Daniel Casellas, Wissenschaftliche Scripten , 2019, s. 313-320Konferensbidrag, Publicerat paper (Refereegranskat)
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.   

Ort, förlag, år, upplaga, sidor
Wissenschaftliche Scripten , 2019. s. 313-320
Serie
CHS²-series ; 7
Nationell ämneskategori
Teknisk mekanik
Forskningsämne
Hållfasthetslära
Identifikatorer
URN: urn:nbn:se:ltu:diva-75752OAI: oai:DiVA.org:ltu-75752DiVA, id: diva2:1346926
Konferens
7th International Conference on Hot Sheet Metal Forming of High Performance Steel (CHS² 2019), 2-5 June, 2019, Luleå, Sweden
Tillgänglig från: 2019-08-29 Skapad: 2019-08-29 Senast uppdaterad: 2023-09-05Bibliografiskt granskad

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Kajberg, JörgenJonsén, Pär

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Hammarberg, SamuelKajberg, JörgenJonsén, Pär
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Material- och solidmekanik
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Totalt: 123 träffar
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