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My research is focused on two linked approaches to understanding ductile fracture and its role in the development of structural components for lightweight vehicles. The first is concerned with the ductility of a range of alloys which are or might be used in advanced automotive vehicles. Currently our focus is on advanced high strength steels, often referred to as third generation steels. These materials, with strengths well in excess of 1GPa, have rather poor ductility. Our research aims to use thermomechanical processing approaches to improve ductility without limiting strength. We use a combination of experimental and modeling approaches in this work. On the experimental side we make extensive use of in-situ x-ray computed tomography (XCT) as well as in-situ experiments (typically tensile tests performed inside an optical or scanning electron microscope). The data from these experiments are fed into continuum mechanics and crystal plasticity models to simulate the deformation and fracture process.
A second approach is concerned with a fundamental study of ductile fracture mechanisms including the processes of void growth and linkage. A series of 2D and 3D model materials with artificial holes are fabricated using picosecond laser drilling followed by subsequent diffusion bonding treatments. The processes are visualized by deforming the model material using in situ testing and are also captured using XCT. The experimental results are used to aid in the development of the existing fracture models.
A second approach is concerned with a fundamental study of ductile fracture mechanisms including the processes of void growth and linkage. A series of 2D and 3D model materials with artificial holes are fabricated using picosecond laser drilling followed by subsequent diffusion bonding treatments. The processes are visualized by deforming the model material using in situ testing and are also captured using XCT. The experimental results are used to aid in the development of the existing fracture models.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2023): 145532
SSRN Electronic Journal (2022): 118513-118513
INTERNATIONAL DEEP-DRAWING RESEARCH GROUP (IDDRG 2020) (2020)
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