Investigations on the temperature-deformation behaviour of advanced high-strength steel sheets (AHSS) under shear loading from nearly isothermal to the adiabatic state
Loading...
Files
Date
2025-08-26
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Alternative Title(s)
Abstract
Steel sheet materials tend to form adiabatic shear bands at high strain rates, leading to
material separation. This phenomenon is used in adiabatic blanking processes, but it should
be avoided in crash safety applications. This paper deals with investigations on the main
influence parameters on adiabatic heating of advanced high strength steel sheets (AHSS)
under shear loading. Focussing on the effect of applied strain rate, experimental
investigations were carried out from quasi-static loading up to crash-relevant strain rates.
Strain and temperature fields were recorded using a high-speed video camera and a high speed
infrared camera, thus enabling a detailed analysis of the generated heat and the heat
transport mechanisms in the deformed zones. The examination showed that the isothermal adiabatic
transition under shear loading ranges between strain rates of 0,01 s-1
up to 50 s-1 for the investigated materials and thus at higher strain rates compared to tensile loading.
This indicates an extreme strain localization in shear bands compared to necking zones at
comparable strain rates. Consequently, larger temperature gradients occur in the shear
zone, which significantly affect the heat transfer mechanisms. Furthermore, with increasing
strain hardening, the isothermal-adiabatic transition region is also shifted to higher strain
rates due to a slowdown of the strain and temperature localization process. Based on these
results, local heating and the occurrence of adiabatic shear bands can be estimated without
costly thermomechanical coupling finite element simulations (FE-Simulations).
Description
Table of contents
Keywords
High strength steel, Metal forming, Thermal effect
Subjects based on RSWK
Hochfester Stahl, Blechumformen, Deformation, Dehnung