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Studying the Rate Dependence and Adiabatic Heating of Essential Work of Fracture in Press Hardening Steels

The automotive industry is currently in a paradigm shift transferring the fleet over from internal combustion vehicles to battery electric vehicles (BEV). This introduces new challenges when designing the Body-In-White (BIW) since it is essential to protect the heavy and energy-dense battery in a crash scenario. Press hardening steels (PHS) have emerged as an excellent choice when designing crash safety parts due to their high-strength and forming flexibility. It is however crucial to evaluate the crash performance of the selected materials before producing parts. Component testing is cumbersome, and it is difficult to separate material behaviour from other influences such as spot welds. Fracture toughness measured in the frame of fracture mechanics using the Essential Work of Fracture (EWF) has emerged as an interesting tool to rationalise crash performance of steel sheet designs. The EWF has previously been shown to increase, sometimes substantially, with increasing strain rate, but the cause of this is still largely unknown. For high strain rates, adiabatic heating can have a significant effect on the mechanical and fracture properties, especially for steel grades with metastable austenite. However, the rate dependence is still evident for press hardened martensitic steel grades. In this work, quasi-static and high-speed EWF experiments are performed on two PHS grades designed for anti-intrusion and energy absorption, respectively. The thermals are monitored using infrared thermography to study the adiabatic heating and thus the thermal environment in the FPZ during EWF at high-loading rates. The results are compared and discussed.

DOI Number: 10.33313/512/A0302
Product:
2024 CHS2 Conference Proceedings
PR-512-A0302
Simon Jonsson, David Frometa, Laura Grife, Fredrik Larsson, Jorgen Kajberg
May 27, 2024
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