Skip to main content

Modeling polyurethane

Submitted by Andreas Burger on
research
Polyurethane
constitutive models

I've started to look into the modeling of polyurethane.  So far I'v found one paper that specifically looks into how to model the mechanical behavior of PU. It describes a possible constitutive model for PU:

Stress-strain behavior of thermoplastic polyurethanes, Qi,H.J.; Boyce, M.C., Mech. Mater. 2005, 37, 8, 817-839

Does someone know of any other resources on the modeling of PU?  Thanks, Andreas

Elastic deformation of substrate due to rotation of rigid pillar

Submitted by Steffen Brinckmann on
research
elasticity
small strain

Consider a ridig pillar ontop of a elastic substrate. Applying a moment to the pillar will lead to elastic deformation of the substrate. If the pillar is infinitly large in diameter, then this problem is the same as an infinitely sharp crack, considering the symmetry of the crack problem, i.e. there are square root singularities. However, the infinitly large diameter assumtion does not hold if the global rotation of the substrate under the pillar is of interest, because the both sides of the pillar interact.

CFL number

Submitted by BFarley on
Forums
Computational Mechanics Forum
Free Tags
CFD
CFL

I'm working at a University where we are developing and running interface software for CFD simmulations. There are no CFD specialists in my lab, however, so we get the information we need from a couple of other labs around campus.

Unfortunately, no one seems to know what the CFL number is, or how to use it.

Can I just get a simple explanation of the CFL number and a general range in which it should lie?

Thank you! 

quries for a battery driven car

Submitted by ashish katarkar on
Forums
Ask iMechanica
Free Tags
hybrid cars for 800 or less cc engines

 I am a doctor by profession  but reading about fuel prices and pollution got me in this

i use a electric scooter for last two years and its fine for my daily work as well as for my part to keep earth clean

i want to ask if i put a calcium calcium battery to run a 1000kg gross weight car with a800 cc petrol engine

firstly what battery power i need

secondly at asteady speed of 80kmph will the dynamo can recharge the batteries sothat the speed can be maintained 

wave propagation in Hamilton Systems

Submitted by Teng zhang on
research
wave propagation Hamilton Systems

I am a junior graduate student now, and very interesting in wave motion. My advisor Prof. Zhong wanxie and his PHD student qiang Gao have developed a precise numerical technique to solve the Rayleigh wave frequency equation, which can avoid the missing root. They did a systematic work involving surface wave propagation in a transversely isotropic stratified solid resting on an elastic semi-infinte space, wave propagation in the anisotropic layered media and the propagation of stationary and non-stationary random waves in a viscoelastic, transversely isotropic and stratified half space.

Subscribe to