Abstract
This paper deals with the problematics of tensile testing of maraging steel lightweight cylindrical samples with internal structures, intended for automotive application. The samples were made with DMLS technology and tensile tested under the static strain rate of 0.002 s-1. During the loading, uneven deformations and multiple necking occurred on the samples. The mentioned effect significantly affects the state of stress and deformation at the final fracture zone, as well as the total deformation into the fracture, which means that it actually distorts the standard tensile test record. Therefore, a methodology for capturing the deformation response using the ARAMIS optical system was proposed. The methodology is presented and verified by a set of experiments for BCC internal structure.
Highlights
Most of current development and research in the automotive field is devoted to vehicle weight savings and electromobility
This paper describes a method of capturing non-uniform deformations in tensile tests of 3D printed cylindrical samples containing internal structures
The mentioned effect significantly affects the state of stress and deformation at the final fracture zone, as well as the total deformation into the fracture, that means as a matter of fact it distorts the standard tensile test record
Summary
Most of current development and research in the automotive field is devoted to vehicle weight savings and electromobility. One of the possibilities to save vehicle weight is to use 3D printing (additive manufacturing) technologies to produce special lightweight components. This weight loss can be achieved by suitable material removal using the so-called topological optimization, or by suitable use of internal structures. The greatest weight loss can be achieved on the metallic materials of vehicles, so the development and research around 3D metal printing technologies is very intensive. The initiation of the use of metal 3D printing in production requires considerable research into material properties, which may differ from commonly used materials. This paper describes a method of capturing non-uniform deformations in tensile tests of 3D printed cylindrical samples containing internal structures
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