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Towards high velocity deformation characterisation of metals and composites using Digital Image Correlation

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  • Characterisation Of Materials Subject To High Velocity Deformation Is Necessary As Many Materials Be
  • It Is Particularly Important For Accurate Numerical Simulation Of High Strain Rate Events
  • High Velocity Servo-Hydraulic Test Machines Have Enabled Material Testing In The Strain Rate Regime
  • The Range Is Much Lower Than That Experienced Under Ballistic
  • Shock Or Impact Loads
  • Nevertheless It Is A Useful Starting Point For The Application Of Optical Techniques
  • The Present Study Examines The Possibility Of Using High Speed Cameras To Capture Images And Then Ex
  • Three Different Materials
  • Aluminium Alloy 1050
  • S235 Steel And Glass Fibre Reinforced Plastic (Gfrp) Were Tested At Different Nominal Strain Rates R
  • In All Cases Dic Was Able To Analyse Data Collected Up To Fracture And In Some Cases Post Fracture
  • The Use Of Highspeed Dic Made It Possible To Capture Phenomena Such As Multiple Necking In The Alumi
  • Design
  • Mathematics
  • Physics


Topology Optimisation for Coupled Convection Problems Authors: Joe Alexandersen1, Casper Schousboe Andreasen, Niels Aage, Boyan Stefanov Lazarov and Ole Sigmund Department of Mechanical Engineering, Technical University of Denmark Abstract The work focuses on applying topology optimisation to forced and natural convection problems in fluid dynamics and conjugate (fluid-structure) heat transfer. To the authors’ knowledge, topology optimisation has not yet been applied to natural convection flow problems in the published literature and the current work is thus seen as contributing new results to the field. In the literature, most works on the topology optimisation of weakly coupled convection-diffusion problems focus on the temperature distribution of the fluid, but a selection of notable exceptions also focusing on the temperature in the solid are [3–6]. The developed methodology is applied to several two-dimensional solid- fluid thermal interaction problems, such as cooling of electronic components and heat exchangers, as well as to the design of micropumping devices based on natural convection effects. The implementation utilises the widely used Brinkman-penalisation ap- proach to fluid topology optimisation [2] combined with suitable interpola- tion functions for thermal conductivity. The Method of Moving Asymptotes (MMA) is used and density filtering is applied in order to ensure a min- imum lengthscale. The results are generated using stabilised finite elements implemented in a parallel multiphysics analysis and optimisation framework DFEM [1], developed and maintained in house. Focus is put on control of the temperature field within the solid structure and the problems can therefore be seen as conjugate heat transfer problems, where heat conduction governs in the solid parts of the design domain and couples to convection-dominated heat transfer to a surrounding fluid. Both loosely coupled and tightly coupled problems are considered. The loosely coupled problems are

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