Experimental Investigation of Delayed Fracture Initiation in Advanced High-Strength Steel Under Accelerated Bending
Kyucheol Jeong, Jaewook Lee, Jonghun Yoon
TL;DR
This paper investigates how bending speed affects crack formation in high-strength steel, revealing that faster bending delays cracks.
Contribution
The study introduces direct bending experiments to explore crack initiation in AHSS under accelerated conditions.
Findings
Accelerated bending delayed crack initiation in all tested AHSS materials.
Small-radius bending reduced strain localization due to strain rate hardening.
Larger-radius bending increased fracture strain.
Abstract
Predicting bending fractures in advanced high-strength steel (AHSS) is challenging due to complex microstructural behaviors and strain rate dependencies, particularly in industrial forming processes. Current models and standards primarily focus on quasi-static tension or slow bending speeds, leaving a gap in understanding the accelerated failure of AHSS without necking. In this study, direct bending experiments were conducted on dual-phase, complex-phase, and martensitic AHSS grades under varying bending speeds and radii. Since the bending crack is irrelevant to the load drop, surface crack evolution was measured using three-dimensional surface profile analysis. The results showed that accelerated bending significantly delayed crack initiation across all tested materials, with small-radius bending showing reduced strain localization due to strain rate hardening. Larger-radius bending…
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Taxonomy
TopicsMetal Forming Simulation Techniques · Microstructure and Mechanical Properties of Steels · Metallurgy and Material Forming