Abstract
Dynamic testing of sheet metals has become more important due to the need for more reliable vehicle crashworthiness assessments in the automotive industry. The study presents a comprehensive set of experimental results that covers a wide range of stress states on a dual phase automotive sheet steel. Split Hopkinson bar tensile (SHBT) tests are performed on dogbone shaped samples to obtain the plastic hardening properties at high strain rates. A set of purpose designed sample geometries comprising of three notched dogbone tension samples is tested at high strain rates to characterise the dynamic damage and fracture properties under well controlled stress states. The geometry of the samples is optimised with the aid of finite element analysis. During the tests, high speed photography together with digital image correlation are implemented to acquire full field measurements and to gain more insight into the localisation of strains at high strain rates. An experimental-numerical approach is proposed to effectively determine the fracture characteristics of the dual phase steel under extreme conditions. A modified Bai-Wierzbicki model is implemented to assess the damage initiation and subsequent failure. Additionally, the fracture mechanisms are studied utilizing scanning electron microscopy.
Highlights
The automotive industry is constantly evolving and it is necessary to build research, development and innovation capacity
The study presents a comprehensive set of experimental results that covers a wide range of stress states on a dual phase automotive sheet steel
Split Hopkinson bar tensile (SHBT) tests are performed on dogbone shaped samples to obtain the plastic hardening properties at high strain rates
Summary
The automotive industry is constantly evolving and it is necessary to build research, development and innovation capacity. An improved understanding of the behavior of automotive materials at high velocity is driven by the challenges of diverse crash legislation and competition amongst car makers. The mechanical behavior of materials under dynamic or impact loading is different from that under static loading. When a structure deforms dynamically, the inertia effect and the propagation of stress waves are so important that the material properties are influenced by the strain rate [35]. Tensile testing of metallic sheet materials at high strain rates is important to achieve a reliable analysis of vehicle crashworthiness. In order to investigate the material component performance of crash boxes, it is essential to characterize the material mechanical properties, including the elastic-plastic deformation and damage/ fracture properties at dynamic rates
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