Dear Sir,

If possible could you guide me through getting the results for Wooden Railsleeper design?

I am feeling more depression with this topic, please guide me sir to complete this thesis.

Below text is from my Professor.

*I would suggest do start with a 2D-model. For timber linear elastic, anisotropic material behaviour is for my opinion satisfying, as the timber member would not come to a fracture state at serviceability loads. Modelling the ballast will be the most challenging part, you have to understand some geotechnical material models.*

*Pleas search in citavi for “hardening soil model (HS-model)” and “hardening soil with small strains (HSS-model)”. Ansys is unable to capture those material models.*

*But please understand the difference between the Mohr Coulomb MC and the improved HS and HSS-models for soils. The stiffness depends on the stress state and MC cannot capture that.*

*Try to find some literature where the combination sleeper-ballast was modelled using ANSYS.*

*I can remember some literature, where the ballast was modelled using Drucker-Prager or MC. Those models are implemented in ansys.*

*Find out the limitations of that models and a suitable way to overcome that limitations. I suggest to model the ballast twice, with upper and lower bounds of the stiffness.*

*The more the ballast is compacted, the stiffer the soil is. Also keep in mind timber creeping effects.*

*So you will have two models. First model at t=0 (initial state) and a second model at t=∞ (end state) including a reduced modulus of elasticity of wood (a simple way to take into account creeping of wood) and an increased stiffness of the ballast due to compaction.*

*After verification of your 2D model to available literature I would suggest to create a 3D model. Please also consider the necessary model length in track axis*