Fri 02 Feb 14:00: Role of Phase Transformation on Shock Compression Behavior of Iron
Abstract not available
- Speaker: Dr Vatsa Gandhi, Ashby Fellow
- Friday 02 February 2024, 14:00-14:30
- Venue: Oatley 1 Meeting Room, Department of Engineering.
- Series: Engineering - Mechanics and Materials Seminar Series; organiser: Elizabeth Howard.
Fri 26 Jan 14:00: Dynamic rupture behavior and friction evolution revealed by laboratory experiments using ultra high-speed digital image correlation
Shear cracks along interfaces are relevant to a broad class of engineering and geophysics applications, ranging from the failure of composite materials and bonded joints to earthquakes and landslides. Characterizing the rheology of interfaces and faults is of paramount importance to improve our understanding of frictional ruptures, as friction controls key processes of rupture nucleation, propagation, and arrest and influences various rupture outcomes, for example how damaging earthquakes can be. In this presentation, I will discuss recent advances in the characterization of rupture behavior and friction evolution using our newly developed imaging technique, based on digital image correlation (DIC) coupled with ultrahigh speed photography. One of the highlights of this new approach is its ability to experimentally capture the full-field evolution of particle velocities and strains of spontaneously propagating dynamic ruptures at a level of detail that until recently was possible to achieve only with numerical simulations. Dynamic imaging of stresses enables us to decode the nature of friction by tracking its evolution and studying its dependence on slip, slip velocity and their history. The measured friction behavior allows us to challenge existing friction laws and formulate new ones. This approach gives a new perspective on the study of friction and provides important insights into earthquake and rupture physics.
- Speaker: Prof Vito Rubino École Centrale de Nantes, France
- Friday 26 January 2024, 14:00-15:00
- Venue: Oatley 1 Meeting Room, Department of Engineering.
- Series: Engineering - Mechanics and Materials Seminar Series; organiser: div-c.
Fri 08 Mar 14:00: Some Thoughts on the Future of Physical Metallurgy
Abstract not available
- Speaker: Roger Reed, University of Oxford
- Friday 08 March 2024, 14:00-15:00
- Venue: Oatley Seminar Room, Department of Engineering.
- Series: Engineering - Mechanics and Materials Seminar Series; organiser: div-c.
Fri 19 Jan 14:00: In-Silico Experiments to Unravel the Complexity of Engineering Interfaces
This talk will cover recent advances in modelling aspects of a variety of problems where the behaviour of solid-solid and solid-fluid interfaces controls the performance of the engineering systems under investigation. It will start with an overview of the modelling tools developed to study interfacial phenomena across the scales and will then move onto demonstrating how in-silico experiments can be used to shed light on various physical, chemical and mechanical phenomena that affect frictional interactions and engineering performance in several applications.
The main themes discussed are the study of the influence of molecular processes on frictional, rheological and material response, the potential breakdown of continuum theories at the nano- and microscales, as well as multiscale and multiphysics aspects for computational models relevant to applications covering a variety of sectors, from automotive to biotribology and nanotechnology. Many systems involve two or more interlinked phenomena that are governed by mechanisms originating at different scales, for which complex multiscale and multiphysics models are needed. These are still challenging to develop and use as they require multidisciplinary expertise and collaborative effort. A few successful examples portraying how predictive models can be used to better design of surfaces and materials are provided in this talk, which show how to conduct successful virtual experiments and their necessary links to laboratory tests.
The presentation will conclude with an outlook at future trends and examples of how to tackle problems ranging from machine components and biomedical devices to triboelectricity as well as other advanced technological applications.
- Speaker: Professor Daniele Dini, Department of Mechanical Engineering, Imperial College
- Friday 19 January 2024, 14:00-15:00
- Venue: Oatley Seminar Room, Department of Engineering.
- Series: Engineering - Mechanics and Materials Seminar Series; organiser: div-c.
Fri 15 Mar 14:00: Title - tbc
Abstract not available
- Speaker: Professor Laura De Lorenzis, ETH Zurich
- Friday 15 March 2024, 14:00-15:00
- Venue: Department of Engineering - LT6.
- Series: Engineering - Mechanics Colloquia Research Seminars; organiser: div-c.
Fri 02 Feb 14:00: Role of Phase Transformation on Shock Compression Behavior of Iron
Abstract not available
- Speaker: Dr Vatsa Gandhi, Ashby Fellow
- Friday 02 February 2024, 14:00-14:30
- Venue: Oatley Seminar Room, Department of Engineering.
- Series: Engineering - Mechanics and Materials Seminar Series; organiser: Elizabeth Howard.
Fri 02 Feb 14:30: Nanovoid Irradiation Hardening in Metals: A Mesoscale Perspective".
Abstract not available
- Speaker: Dr Ashley Roach
- Friday 02 February 2024, 14:30-15:00
- Venue: Oatley Seminar Room, Department of Engineering.
- Series: Engineering - Mechanics and Materials Seminar Series; organiser: Elizabeth Howard.
Fri 02 Feb 14:00: Role of Phase Transformation on Shock Compression Behavior of Iron
Abstract not available
- Speaker: Dr Vatsa Gandhi
- Friday 02 February 2024, 14:00-14:30
- Venue: Oatley Seminar Room, Department of Engineering.
- Series: Engineering - Mechanics and Materials Seminar Series; organiser: Elizabeth Howard.
Fri 26 Jan 14:00: Dynamic rupture behavior and friction evolution revealed by laboratory experiments using ultra high-speed digital image correlation
Shear cracks along interfaces are relevant to a broad class of engineering and geophysics applications, ranging from the failure of composite materials and bonded joints to earthquakes and landslides. Characterizing the rheology of interfaces and faults is of paramount importance to improve our understanding of frictional ruptures, as friction controls key processes of rupture nucleation, propagation, and arrest and influences various rupture outcomes, for example how damaging earthquakes can be. In this presentation, I will discuss recent advances in the characterization of rupture behavior and friction evolution using our newly developed imaging technique, based on digital image correlation (DIC) coupled with ultrahigh speed photography. One of the highlights of this new approach is its ability to experimentally capture the full-field evolution of particle velocities and strains of spontaneously propagating dynamic ruptures at a level of detail that until recently was possible to achieve only with numerical simulations. Dynamic imaging of stresses enables us to decode the nature of friction by tracking its evolution and studying its dependence on slip, slip velocity and their history. The measured friction behavior allows us to challenge existing friction laws and formulate new ones. This approach gives a new perspective on the study of friction and provides important insights into earthquake and rupture physics.
- Speaker: Prof Vito Rubino École Centrale de Nantes, France
- Friday 26 January 2024, 14:00-15:00
- Venue: Oatley Seminar Room, Department of Engineering.
- Series: Engineering - Mechanics and Materials Seminar Series; organiser: div-c.
Fri 01 Mar 14:00: Mechanics of Soft Composites: The Interplay between Geometrical Structuring and Large Deformation to Achieve Novel Behavior
Soft composites offer new avenues for the design and fabrication of materials and devices that exhibit novel properties and functional behavior. Engineering the interplay between the geometrical structuring of constituent materials and the large deformation behavior of the soft matrix enables structural transformations and tunable properties. Here we explore the mechanics and the design of soft composites through analytical and numerical modeling as well as through experiments on physical prototypes fabricated using multi-material 3D printing. A first exemplar set focuses on both patterned and layered structures which exhibit deformation-induced pattern transformations. These structural transformations result in concomitant changes in a multitude of behaviors: giving superelastic and multilinear elastic response, enhanced mechanisms for energy storage, and the ability to manipulate wave propagation and alter phononic band gaps. Inspired by natural material systems, we also explore soft composite materials with alternating soft/stiff layered structures. The discrete anisotropic nature of these material systems are demonstrated to provide protective yet flexible armor and are separately found to be a novel design for soft actuators, transforming local compressive loading to large scale rotational motion. Also inspired by nature, a third set presents soft matrices augmented by stiff particles which yield a material with morphable surface topologies.
- Speaker: Professor Mary Boyce, University of Columbia
- Friday 01 March 2024, 14:00-15:00
- Venue: Department of Engineering - LT2.
- Series: Engineering - Mechanics Colloquia Research Seminars; organiser: div-c.