A soil and magma mechanics approach to understanding defects in cast metals manufacturing
Lead Research Organisation:
University College London
Department Name: Earth Sciences
Abstract
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Organisations
People |
ORCID iD |
| Peter Sammonds (Principal Investigator) |
| Description | In casting of metals, there is a mushy zone of mixed liquid and solid metal. We did experiments on semi-solid alloy samples that allows, loaded along three axes where liquid metal can be drawn into or expelled from the sample in response compression. The experimental rig is used to measure the pressure-dependent flow stress and volumetric response during triaxial compression of globular semi-solid Al-15wt.%Cu at 70-85 volume percent solid. Analysis of the stress paths and the stress-volume data shows that the combination of the solid fraction and mean effective pressure determines whether the material undergoes shear-induced dilation or contraction. The results are compared with the critical state soil mechanics (CSSM) framework and the similarities and differences in behaviour between equiaxed semi-solid alloys and soils were explored. |
| Exploitation Route | The research will allow the metal casting industry to better model the process. |
| Sectors | Manufacturing, including Industrial Biotechology |
| Description | Multi-axial compression of the mushy zone occurs in various pressurized casting processes. Analysis of the stress paths and the stress-volume data show that the combination of the solid fraction and mean effective pressure determines whether the material undergoes shear-induced dilation or contraction. The results are compared with the critical state soil mechanics (CSSM). These findings we believe will impact the castings industry with better product control. Our findings have also been used in the better construction of equipment. |
| First Year Of Impact | 2021 |
| Sector | Manufacturing, including Industrial Biotechology |
| Impact Types | Economic |
| Title | High temperature porous deformation |
| Description | High temperature, high pressure triaxial deformation for metals. |
| Type Of Material | Improvements to research infrastructure |
| Year Produced | 2014 |
| Provided To Others? | Yes |
| Impact | None yet |