Effect of surface characteristics on strain distribution in air- bending

Antti Kaijalainen, Aki-Petteri Pokka, Matias Jaskari, Juha Huuki, Tommi Hintsala, Jukka Kömi

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

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Abstract

This study is a continuation of previous studies; therefore, the idea is to determine the influence of surface roughness and hardness on the bendability of a UHSS grade, and it is investigated with 3-point bending tests, utilizing Digital Image Correlation (DIC) for measuring the strain distributions on the outer curvature. Investigated bending samples of a 4 mm thick commercial bainitic-martensitic steel sheet were tested in different surface conditions: (1) asrolled, (2) dry electropolished, (3) ultrasonic burnishing and (4) a combination of dry electropolishing and ultrasonic burnishing. Ultrasonic burnishing increased the surface hardness and decreased the surface roughness. Bending results showed that smoother surface did not lead to improved bending angles and higher hardness in the subsurface decreased the bending capacity, i.e., reduced the maximum bending angle and critical strain.
Original languageEnglish
Title of host publicationMetal Forming 2024
EditorsDanuta Szeliga, Krzysztof Muszka
PublisherMaterials Research Forum LLC
Pages350-357
Number of pages8
ISBN (Electronic)978-1-64490-325-4
ISBN (Print)978-1-64490-324-7
DOIs
Publication statusPublished - 18 Sept 2024
MoE publication typeA4 Conference publication
EventInternational Conference on Metal Forming - Krakow, Krakow, Poland
Duration: 15 Sept 202418 Sept 2024
Conference number: 20

Publication series

NameMaterials Research Proceedings
Volume44
ISSN (Print)2474-3941
ISSN (Electronic)2474-395X

Conference

ConferenceInternational Conference on Metal Forming
Country/TerritoryPoland
CityKrakow
Period15/09/202418/09/2024

Keywords

  • DIC
  • bendability
  • hardness
  • roughness
  • ultra-high strength steel
  • Roughness
  • Ultra-High Strength Steel
  • Hardness
  • Bendability

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