Research projects

Forming Safety Critical Panel Beams with Efficacious Graded Microstructures for Passenger Cars

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download phần mềm crack win 7 ultimate regclean pro keygen 6.1 In recent years, a hot stamping with cold die quenching process has been developed in producing high strength structural components made of quenchable steels, particularly for automotive safety components, such as side-door impact beams, bumper beams, side rail members and anti-intrusion beams. The process includes heating the quenchable steel blank to above the austenite temperature, giving sufficient time to allow full transformation to austenite, then transferring the workpiece to the press and forming the part quickly with a water-cooled die-set. The material is then held in the cold-die set for about 15 seconds to achieve rapid cooling and enable the austenite to transform to martensite and bainite. Thus the material can be formed with lower forming forces, achieving higher strength.

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  • spss version 17.0 crack Develop modelling techniques to predict the microstructure distribution of formed parts. Particular concentration will be on Bainite and Martensite for a front bumper.
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Multiscale Modelling for Next Generation Steels

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descargar crack de windows 8 release preview telecharger mirillis action crack fr Porosity in the cast bloom may lead to reduced strength or inconsistency within the rolled product. Currently there is a lack of knowledge regarding the mechanisms of consolidation and there is a need to develop accurate modelling equations to predict the behaviour of a porous cast.

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Aluminium Foam Sandwich Panels for Lightweight Wing Structures

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Linkage of Intermediate Damage in Mechanics to Material and Fracture Models

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how to apply pink crackle nail polish The main aim of this project is to provide quantitative links between the material response in metallics and the material theories and models developed within QinetiQ. This involves an integrated series of tests to determine quantitative information concerning the level of damage (i.e. void growth, cracks, etc.) in sample materials. The QinetiQ models are used in the hydrocode simulations of high strain rate loading in a variety of applications ranging from shaped charge jet formation, blast interaction with structures and general impact with structures. There is great interest in improving the fidelity of these simulations to give a quantitative indication of localisation and failure on the response of a structure.

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Multiscale Modelling of Delayed Hydride Cracking in Fuel Cladding Materials

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An Investigation of the Hot Forming Quench (HFQ) Process for AA6082 Aluminium Alloys

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how much does it cost to fix a crack ipod touch screen This research mainly looks into the mechanical properties and microstructure evolution during the thermal treatments of AL-alloys, particularly the Solution Heat Treatment (SHT) of 6xxx aluminum alloys during the novel Heat, Form & Quench (HFQ) sheet metal forming operation. Age hardening sheet aluminum alloys have recently gained a large amount of interest from the automotive industry, for applications such as light weight structural components. The material must be thermally treated to obtain a high strength comparable strength to competing materials such as steel. The main objective of this work is the design of innovative experimental procedures and the development of modelling tools to accurately investigate and describe the newly HFQ process for AA6082 aluminium alloys. The mechanical and microstructural properties ofAA6082 aluminium alloys are investigated.

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Materials Modelling for Inertia Welding

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change mac address 2.7.0 keygen Inertia welding is a solid state welding process, in which one component is stationary and the other is attached to a flywheel which is accelerated to a certain rotating speed and then released to provide an inertial force, while in the same time an axial pressure is applied, bringing the rotating component into contact with the stationary one and joining the two parts together with the heat generated by friction. Because of its localised weld and the ability to join dissimilar materials, it is finding use in aerospace industry (such as turbine wheel and shafts) which calls for the very best performance of engines.

During inertia welding, heat is built-up at the interface and dissipated mostly through the joining components and there is inevitably some heat affected zones (HAZ) near the weld interface in both components. Under applied pressure/load, the materials near the weld interface undergo severe deformation. This would lead to changes in microstructure and properties of the materials in this region. As part of the TSB project - PROcess MOdelling for Tomorrow's Engine (PROMOTE), a unified approach is employed to model these changes of nickel superalloy (RR1000) and steels (Super CMV and Aermet 100). A set of rate equations is developed, which simultaneously considers the evolution of microstructure and of dislocation density due to deformation, static and dynamic recovery and recrystallisation, as well as their effects on the flow stress. The material constants are optimised through the experimental data from thermomechanical testing using Gleeble machine.

These material models are then incorporated into FE code to simulate inertia welding process.

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Modelling of Phase Transformation in Hot Stamping of Boron Steel

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sleeping dogs limited edition crack download With the development of the automotive industry, car manufacturers have increasing concerns with car safety requirements and the relevant environmental impacts. Application of high strength light materials becomes favorable across the world. As a consequence, a new forming approach termed hot stamping and cold die quenching, which is particularly designed for producing critical safety components of passenger cars by using advanced high strength steels, was developed. This is a hybrid-forming process which enables the steel blanks to be formed and heat treated in a single operation. The material is formed at the softest state, and can be strengthened during quenching in cold dies. Therefore, best ductility, highest strength and minimized spring back can be achieved.

Theoretical study and modelling work is urgently required for this newly developed forming process. This research work fills in the gap by modeling the material behavior during the hot stamping and cold die quenching process. Mechanisms of phase transformation of boron steel have been studied; unified constitutive equations which can predict austenite, bainite and martensite phase transformations were introduced. Mechanical property of the material has also been investigated, and a visco-plastic damage model was developed. Finite element analysis has been conducted by implementing the developed models into ABAQUS via VUMAT. The simulation result agrees well with experimental test. A better understanding of the hot stamping and cold die quenching of boron steel has been achieved which is beneficial for both car manufactures and steel companies.

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Multiscale Modelling for Multi-layered Surface Systems (MSS)

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cach cai win 8 co crack In order to combat surfaced related degradations, a large variety of different surface engineering systems, with thickness ranging from the nano-meter scale to the millimetre scale, have been developed in past decades. Typical examples, such as Fig.1, can be found in high-speed cutting tools, where multilayered surface coating systems, are used to enhance the wear and fatigue performances.

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how to crack admin password on win 7 The purpose of this project is to establish integrated, generic, robust multiscale materials modelling techniques for the design and performance prediction of multilayer surface systems (MSSs). In particular, it has the following objectives.

  • Develop molecular dynamics techniques to model atom deposition processes and the atomic structure and interfaces to achieve optimal coating microstructures;
  • Develop multiscale modelling and corresponding experimental techniques to determine nano and crystal behaviour of each layer of a surface coating and the macro behaviour of MSSs;
  • Develop an integrated multiscale modelling approach to link molecular dynamics (nano), crystal plasticity (micro) and continuum mechanics;
  • Develop modelling techniques and software systems for design, processes and applications of multiscale MSS;
  • Develop modelling-based design methodology for optimised MSSs for high performance components aiming for improved lifetimes and reduced market lead time.

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Constitutive Modelling and Simulation for Creep Age Forming Process

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world in conflict soviet assault crack free download Creep Age Forming (CAF) is a new forming method based upon the stress relaxation or creep phenomenon that occurs during the artificial age-hardening of a metal in a vacuum autoclave, which has been recently developed for the manufacture of heat treatable aluminium alloy panel components, particularly, aircraft wing panels, with high accuracy and complex multiple curvature. Unlike other conventional forming methods, such as roll forming, brake forming, shot-peening or stretch forming, CAF components have lower forming stesses and residual stresses, which on the one hand decrease the possibility of processing crack, plastic instability in the forming process, and on the other hand improve the long-term performance of the components since it improves the resistance to both fatigue and stress corrosion cracking.

Significant research work has been carried out over the last decade and the applications have been expended. But there are still a lot of problems exist for better applications of such technique. One of the most important things is the prediction of springback. While the foremost thing referring to springback prediction is to establish a proper micro-macroscopical coupled constitutive equations for the component. Until now the interaction between stress relaxation and ageing precipitation still didn't be totally understood. Moreover a general micro-macroscopical coupled constitutive equations and relative database package, that is materail subroutine suitable for all materials undergoing CAF process will also be a challenge for the future.

An integrated system to carry out micro-macroscopical coupled simulation for the creep age forming of heat treatable metals using commercial FE codes still needs to be further improved. More attention should be paid on the microstructure analysis to set up the relationship among the forming conditions, microstructures and mechanical properties for the CAF process in the long run.

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Representation of Virtual Microstructure for Polycrystalline Materials

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Modelling of Superplastic Forming

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Advanced Damage Modelling of Free Machining Steels

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iit rank 14000 Most hot forming operations are in large batches; therefore any small percentage of scrapped products can have a massive cost. Therefore, a model to accurately predict damage will be a useful aid in avoiding it. To produce a model the damage mechanisms have to be understood. The damage mechanisms change depending on the temperature, strain rate, microstructure and stress state.

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Modelling of Interfacial Problems at the Micro-scale

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A New Process Development for Efficient Precision Gas Turbine Blade Forming

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