Thu 02 May 15:00: Energetics now and future trends
Energetic materials are widely used in civilian and military applications. Due to the hazardous nature of energetic materials their production, storage and use attracts more regulation and qualification than most other materials. This has resulted in two trends: (1) the intense study of specific compositions as actively produced and (2) a conservative approach to material introduction.
The combination of these two factors means that this material type, generally under the umbrella of UN Hazardous Materials Type 1, are subject to steady on-going research. This talk will attempt to put these materials in context and also identify some trends in current developments.
- Speaker: Bill Proud, Institute of Security Science and Technology, Imperial College, London
- Thursday 02 May 2024, 15:00-16:00
- Venue: Mott Seminar Room, Cavendish Laboratory.
- Series: Physics and Chemistry of Solids Group; organiser: Stephen Walley.
Thu 02 May 15:00: Title to be confirmed
Energetic materials are widely used in civilian and military applications. Due to the hazardous nature of energetic materials their production, storage and use attracts more regulation and qualification than most other materials. This has resulted in two trends: (1) the intense study of specific compositions as actively produced and (2) a conservative approach to material introduction.
The combination of these two factors means that this material type, generally under the umbrella of UN Hazardous Materials Type 1, are subject to steady on-going research. This talk will attempt to put these materials in context and also identify some trends in current developments.
- Speaker: Bill Proud, Institute of Security Science and Technology, Imperial College, London
- Thursday 02 May 2024, 15:00-16:00
- Venue: Mott Seminar Room, Cavendish Laboratory.
- Series: Physics and Chemistry of Solids Group; organiser: Stephen Walley.
Thu 16 May 15:00: Gram-scale explosions to inform numerical modelling and FREM development
Despite the lack of experimental validation data associated with large-scale urban explosions, existing Computational Fluid Dynamics (CFD) solvers are often used to understand how blast waves propagate in complex environments. Replicating large-scale events is often challenging and costly, and so leveraging blast scaling laws to gather empirical data from gram-scale charges provides a useful alternative for interrogating numerical solvers and developing fast running tools. Throughout this presentation, key findings from this stream of research are discussed following a summary of existing capabilities at the University of Sheffield’s Blast & Impact Laboratory.
- Speaker: Adam Dennis, Department of Civil and Structural Engineering, The University of Sheffield
- Thursday 16 May 2024, 15:00-16:00
- Venue: Mott Seminar Room, Cavendish Laboratory.
- Series: Physics and Chemistry of Solids Group; organiser: Stephen Walley.
Thu 02 May 15:00: Title to be confirmed
Abstract not available
- Speaker: Bill Proud, Imperial College, London
- Thursday 02 May 2024, 15:00-16:00
- Venue: Mott Seminar Room, Cavendish Laboratory.
- Series: Physics and Chemistry of Solids Group; organiser: Stephen Walley.
Thu 16 May 15:00: Title to be confirmed
Abstract not available
- Speaker: Adam Dennis, Department of Civil and Structural Engineering, The University of Sheffield
- Thursday 16 May 2024, 15:00-16:00
- Venue: Mott Seminar Room, Cavendish Laboratory.
- Series: Physics and Chemistry of Solids Group; organiser: Stephen Walley.
Thu 09 May 15:00: Image-based high strain rate testing of materials
The advent of camera-based measurements like Digital Image correlation (DIC) and ultra-high speed imaging (submicrosecond interframe times) opens the way to the design of a new generation of high strain rates tests of materials. The underpinning idea is the use of acceleration fields as a volume-embedded load cell. The presentation will give an, overview of the concept and present recent results on composites and ceramics.
- Speaker: Fabrice Pierron, MatchID, Ghent, Belgium
- Thursday 09 May 2024, 15:00-16:00
- Venue: Mott Seminar Room, Cavendish Laboratory.
- Series: Physics and Chemistry of Solids Group; organiser: Stephen Walley.
Thu 02 May 15:00: Title to be confirmed
Abstract not available
- Speaker: Fabrice Pierron, MatchID
- Thursday 02 May 2024, 15:00-16:00
- Venue: Mott Seminar Room, Cavendish Laboratory.
- Series: Physics and Chemistry of Solids Group; organiser: Stephen Walley.
Thu 23 May 15:00: Title to be confirmed
Abstract not available
- Speaker: Gil Alexandrowicz, Department of Chemistry, The University of Swansea
- Thursday 23 May 2024, 15:00-16:00
- Venue: Mott Seminar Room, Cavendish Laboratory.
- Series: Physics and Chemistry of Solids Group; organiser: Stephen Walley.
Thu 15 Feb 15:00: Multi-Scale Characterization of Materials under Extreme Conditions
The focus of this talk is on the shock compression behavior of materials, under different loading conditions (e.g., compression-shear loading) and at the atomistic-macroscopic spatial scales. In the first part of the talk, the role of solid-solid phase transformation on the dynamic strength behavior of iron is investigated, followed by exploring the role of material heterogeneities on shock structuring along the mesoscopic-macroscopic material scale in particulate composites. Lastly, a brief overview of shock experiments at the atomistic material scale is presented incorporating plate impact experiments with both laser interferometry (continuum measurements) and in-situ dynamic Laue x-ray diffraction at the Advanced Photon Source.
- Speaker: Vatsa Gandhi, Cambridge University Engineering Department
- Thursday 15 February 2024, 15:00-16:00
- Venue: Mott Seminar Room, Cavendish Laboratory.
- Series: Physics and Chemistry of Solids Group; organiser: Stephen Walley.
Thu 01 Feb 15:00: 2D Helium Atom Diffraction from a Microscopic Spot
A method for measuring helium atom diffraction with micron-scale spatial resolution is demonstrated in a scanning helium microscope (SHeM) and applied to study a micron-scale spot on the (100) plane of a lithium fluoride (LiF) crystal. The positions of the observed diffraction peaks provide an accurate measurement of the local lattice spacing, while a combination of close-coupled scattering calculations and Monte Carlo ray-tracing simulations reproduce the main variations in diffracted intensity. Subsequently, the diffraction results are used to enhance image contrast by measuring at different points in reciprocal space. The results open up the possibility for using helium microdiffraction to characterize the morphology of delicate or electron-sensitive materials on small scales. These include many fundamentally and technologically important samples which cannot be studied in conventional atom scattering instruments, such as small grain size exfoliated 2D materials, polycrystalline samples, and other surfaces that do not exhibit long-range order.
- Speaker: Nick von Jeinsen, Surface and 2D Nanoscience, Cavendish Laboratory
- Thursday 01 February 2024, 15:00-16:00
- Venue: Mott Seminar Room, Cavendish Laboratory.
- Series: Physics and Chemistry of Solids Group; organiser: Stephen Walley.
Thu 15 Feb 15:00: Multi-Scale Characterization of Materials under Extreme Conditions
The focus of this talk is on the shock compression behavior of materials, under different loading conditions (e.g., compression-shear loading) and at the atomistic-macroscopic spatial scales. In the first part of the talk, the role of solid-solid phase transformation on the dynamic strength behavior of iron is investigated, followed by exploring the role of material heterogeneities on shock structuring along the mesoscopic-macroscopic material scale in particulate composites. Lastly, a brief overview of shock experiments at the atomistic material scale is presented incorporating plate impact experiments with both laser interferometry (continuum measurements) and in-situ dynamic Laue x-ray diffraction at the Advanced Photon Source.
- Speaker: Vatsu Gandhi, Cambridge University Engineering Department
- Thursday 15 February 2024, 15:00-16:00
- Venue: Mott Seminar Room, Cavendish Laboratory.
- Series: Physics and Chemistry of Solids Group; organiser: Stephen Walley.