Abstract
The presented study deals with the FEM simulation of dynamic behaviour of U-profile crash under three point bent loading conditions verified by experimental investigations. The material ductile damage behaviour under wide strain rate region covering 0.001 – 1 000 s-1 was experimentally determined with the use of standard and micro tensile tests (M-TT). DIC systems were used for strain field measurements under quasi-static and dynamic loading conditions. Based on these experimental data, material model considering ductile damage was established in Abaqus/Explicit code. Additionally, also metallographic investigations were performed for the fracture behaviour description.
Highlights
Over the last decade average weight of midsize car has reduced from 1400 kg to 1150 kg resulting in 18% reduction of total car weight
The material ductile damage behaviour at strain rates 0.001 – 1 000 s-1 was experimentally determined with the use of standard and micro tensile tests (M-TT)
Digital Image Correlation (DIC) systems were used for strain field measurements under quasi-static and dynamic loading conditions
Summary
Over the last decade average weight of midsize car has reduced from 1400 kg to 1150 kg resulting in 18% reduction of total car weight. Since stainless steels exhibit superior combination of high strength, ductility, formability and toughness compared to other metals and alloys, the intrinsic weight of vehicle decreases and its load carrying capacity and fuel efficiency increases. Automotive industry addresses the trend by reduction of fuel consumption by lowering the car body weight thanks to high strength steels application. Development of such a model is still very active field of research in order to optimize the crash performance [5,6,7,8,9]. DIC systems were used for strain field measurements under quasi-static and dynamic loading conditions Based on these experimental data, material model considering ductile damage was established in Abaqus/Explicit code. Validation of a material model on outwardly simple three-point bending tests of U-shape profile subjected to the dynamic loading was carried out
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