Investigation of the influence of loading direction after pre-forming on the formability and mechanical properties of DP600

Roman Norz, Fabuer R. Valencia, Simon Vitzthum, Bogdan Ungureanu, Steffen Gerke, Michael Brünig, Wolfram Volk

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The material behaviour after non-proportional strain paths is subject of numerous current investigations. These investigations show that in addition to the stress state, a change in the direction of loading also has a significant influence on the material behaviour. In this work, the influence of non-proportional strain paths on the mechanical properties such as tensile strength, uniform strain, elongation at fracture and yield strength as well as the influence on formability is determined. For this purpose, a dual-phase steel CR330Y590-DP, with a thickness of 0.8 mm, is investigated in more detail. The material is pre-strained to different strain values and then further examined with Nakajima and tensile tests. The influence of the loading direction is determined by five different post-strain directions (0°, 22,5°, 45°, 67.5°and 90°) to the initial pre-strain direction. In addition to the method according to the standard, the yield strength is determined by a temperature-dependent determination method, which is based on the thermoelastic effect. This method has already been qualified for simple uniaxial tensile tests and a relation to the microstructural behaviour was proven. Thus, it provides valuable conclusions on the microstructural behavior for the tests performed within this study with a change in the loading direction.

Original languageEnglish
Title of host publicationMaterial Forming - The 26th International ESAFORM Conference on Material Forming – ESAFORM 2023
EditorsLukasz Madej, Mateusz Sitko, Konrad Perzynsk
PublisherAssociation of American Publishers
Pages747-754
Number of pages8
ISBN (Print)9781644902462
DOIs
StatePublished - 2023
Event26th International ESAFORM Conference on Material Forming, ESAFORM 2023 - Kraków, Poland
Duration: 19 Apr 202321 Apr 2023

Publication series

NameMaterials Research Proceedings
Volume28
ISSN (Print)2474-3941
ISSN (Electronic)2474-395X

Conference

Conference26th International ESAFORM Conference on Material Forming, ESAFORM 2023
Country/TerritoryPoland
CityKraków
Period19/04/2321/04/23

Keywords

  • Cross-Loading
  • Formability
  • Non-Proportional Load Paths
  • Onset of Yielding

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