Sökning: "Constitutive models"
Visar resultat 11 - 15 av 203 avhandlingar innehållade orden Constitutive models.
11. Deformation and Fatigue Behaviour of Aluminium Alloys for High Specific Power IC Engine Applications
Sammanfattning : The development towards higher specific power and lower displacement engines in recent years has placed increasingly high thermal loads on the internal combustion engine materials. Further, the advent of hybrid power trains placing higher demands on quick starts and a rapid approach to maximum power necessitates the automotive industry to move towards a more robust computational thermo-mechanical fatigue life prediction methodology to develop reliable engines and reduce developmental costs. LÄS MER
12. Physically based models of metal plasticity
Sammanfattning : This work is focussing on the material modelling aspects in simulation of forming processes. The research question is: Do physical based material models have any advantages compared to the more common type of engineering models used in simulation of forming processes? The success of performing useful simulations of forming processes depends very much on the accuracy of the used material description. LÄS MER
13. Development of Finite Element Models for 3-D Forming Processes of Paper and Paperboard
Sammanfattning : Paper materials have a long history of use in packaging products, although traditional paper-based packaging is limited in its shape and design. In order to enable more advanced paper-based packaging, various 3-D forming processes for paper materials have been studied. LÄS MER
14. Parameter identification in constitutive models with a posteriori error control and sensitivity assessment
Sammanfattning : In this thesis a framework for the calibration of constitutive models is presented. The framework involves theformulation of an optimization problem which is solved usingstrategies based on, essentially, Newton's method. LÄS MER
15. Development of Energy-based Damage and Plasticity Models for Asphalt Concrete Mixtures
Sammanfattning : Characterizing the full range of damage and plastic behaviour of asphalt mixtures under varying strain-rates and stress states is a complex and challenging task. One reason for this is partly due to the strain rate and temperature dependent nature of the material as well as the variation in the properties of the constituent materials that make up the composite asphalt mixture. LÄS MER