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See detailA Discrete Approach to Describe the Interaction between a Tire Tread and a Snow-Covered Road
Michael, Mark UL; Peters, Bernhard

Presentation (2014, May 21)

The objective of this study is to develop a simulation technique that enables to describe the interactions between snow and a moving surface. The develop- ments of this study are focused on the ... [more ▼]

The objective of this study is to develop a simulation technique that enables to describe the interactions between snow and a moving surface. The develop- ments of this study are focused on the application of the interactions between a tire tread and a snow-covered road.Contrary to a continuum mechanics approach snow is considered to exist of discrete grains which are allowed to bond and collide with each other. There- fore, a discrete approach based on the extended Discrete Element Method is applied to the snow. Micro-mechanical models are developed to describe the deformational behaviour of snow. The micro-mechanical models describe the deformation and growth of the bonds between grains as well as the contact behaviour of snow grains on the grain-scale. Further, the age of a snow sample, the temperature and deformation rate applied are taken into account by the de- veloped models. The deformational behaviour of snow under brittle and ductile loading rates is validated with experimental data of common measurements in the field of snow mechanics. The simulation results successfully recapture the macro- and micro-scale deformation behaviour of snow and enable to identify the primary deformation mechanism in charge at the different loading rates, densities and temperatures.However, this approach allows treating individual snow grains during loading due to a rolling tire and predicting both position and orientation of grains. The micro-mechanical response of each snow grain in contact with the structure of the tire surface generates a global impact that defines the interaction forces be- tween the snow and the tire surface, which simultaneously indicate the strength of traction. In order to predict the elastic deformation of the tire surface the Finite Element Method is employed.A coupling method is developed between the discrete approach to characterize snow and the finite element description of the tire tread. The coupling method compensates quite naturally the shortages of both numerical methods. Further, a fast contact detection algorithm has been developed to spare valuable com- putation time. The coupling approach was successfully tested and validated with a small scale application but also with the large scale application of tire - soil interaction. The large-scale simulation results of tire – soil interactions showed to be accurate in comparison to similar traction measurements. The results show the ability of the simulation technique to describe the targeted interactions and give valuable insight into the underlying mechanisms. [less ▲]

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See detailAN EFFICIENT 3D DEM–FEM COUPLING FOR GRANULAR MATTER APPLICATIONS
Michael, Mark UL; Vogel, Frank; Peters, Bernhard

Presentation (2013, November 26)

Detailed reference viewed: 82 (2 UL)
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See detailSimulation of the Tractive Performance of Tire Treads on Granular Terrain by Means of Finite and Discrete Element Coupling
Michael, Mark UL; Peters, Bernhard; Vogel, Frank

Presentation (2013, October 22)

Detailed reference viewed: 84 (3 UL)
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See detailDiscrete Modeling of Inter-Granular Bonds between Snow Grains
Michael, Mark UL; Peters, Bernhard; Nicot, Francios

Presentation (2013, April 23)

Detailed reference viewed: 73 (2 UL)
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See detailResolution of Different Length Scales by an Efficient Combination of the Finite and the Discrete Element Method
Michael, Mark UL; Peters, Bernhard; Vogel, Frank

Presentation (2012, September 04)

Detailed reference viewed: 67 (0 UL)