Abstract
TRIP (Transformation-induced Plasticity) steel is nowadays in widespread use in the automobile industry because of their favorable mechanical properties such as high strength, excellent formability and toughness because of strain-induced martensitic transformation. Moreover, when TRIP steel is applied to the components of the vehicles, it is expected that huge amount of kinetic energy will be absorbed into both plastic deformation and martensitic transformation during the collision. Basically, bending deformation due to buckling is one of the major crash deformation modes of automobile structures. Thus, an investigation of energy absorption during bending deformation at high impact velocity for TRIP steel is indispensable. Although TRIP steel have particularly attracted the recent interest of the scientific community, just few studies can be found on the energy absorption characteristic of TRIP steel, especially at impact loading condition. In present study, experimental investigations of bending deformation behaviors of TRIP steel are conducted in the three-point bending tests for both smooth and pre-cracked specimen. Then, energy absorption characteristic during plastic deformation and fracture process at high impact velocity in TRIP steel will be discussed.
Highlights
Over the past century, the most important and challenging task for design considerations in the automotive industry is vehicle crashworthiness and an occupant safety with a decrease in weight of automobiles
Energy absorption characteristic during fracture process of materials is considered to be associated with fracture toughness [12, 13]
Value of energyabsorption characteristic in fracture process is calculated by J -integral defined by Rice [10] from experimental results for pre-cracked specimen at the onset point of crack extension
Summary
The most important and challenging task for design considerations in the automotive industry is vehicle crashworthiness and an occupant safety with a decrease in weight of automobiles. Energyabsorption characteristic of structural materials has become a critical issue to protect the passengers from a high-speed crash of automobiles. During a crash of automobiles, a dominant mechanism to keep the safety in automobiles by structures upon the collision is buckling because kinetic energy with higher speed of the vehicles can be consumed by inelastic deformation of components for protection of the passengers [1]. According to Rong et al [9] and Curtze et al [10], a rate sensitivity of energy absorption in TRIP steel can be observed from results of the tensile tests. Based on the observations of perforation tests, Rodrıguez-Martınez et al [11] reported that a decreasing testing temperature leads to larger values of the impact energy-absorption for TRIP steel. Zhu and Joyce [14] evaluated energy absorption of materials by J integral defined by Rice [15] from the area under a force-displacement as a result of the presence of a crack initiation
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