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MRI-R2 has been posted

Submitted by Ken P. Chong on

The NSF Major Research Instrumentation Program (MRI-R²) Recovery and Reinvestment is now posted. This is a good way to build up the needed major research instrumentation

The deadline for proposals will be August 10, 2009.

A link can be found through the page www.nsf.gov/od/oia/programs/mri (preferred to keep abreast of updates) or through the NSF-wide page at http://www.nsf.gov/funding/pgm_summ.jsp?pims_id=5260.

potential functional for material exhibts non-associative elastoplastic response

Submitted by WaiChing Sun on

Does anyone knows where I can find any paper discuss the existence of potential functinoal for materials that violate the maximum plastic dissipation principle (due to non-convex yield function and/or non-associately fluw rule)?

Flow Rate through a gas pipe

Submitted by BobbyBob on

Hi I'm trying to work out the following problem

The pressure at the start of a 180Km stainless steel natural gas pipeline is 4MPa and at the end is 2MPa.  If the diameter of the pipe is 0.4m, what will be the gas flow rate through the system? (ignore losses other than friction)

(for natural gas, density = 40 Kg/m3, viscosity = 11x10-6)

This is from an exam paper and at the end of the paper there's a moody diagram with roughness values, the closest to stainless steel is commercial steel and has a k value of 0.045 mm.

Faculty Position in Fluid Mechanics at University of Maryland

Submitted by Teng Li on
Assistant Professor, Fluid Dynamics
Department of Mechanical Engineering

A. James Clark School of Engineering

University of Maryland, College Park

The Department of Mechanical Engineering at the University of Maryland seeks applications for a tenuretrack

faculty position at the Assistant Professor level in the area of Fluid Dynamics. Specifically,

applicants studying both the fundamental and applied aspects of flow physics using computational and/or

Maxwell viscoelastic model in ABAQUS

Submitted by ahmadalhajahmad on

Hi Guys,

I have the shear relaxation modulus given as: G(t)=Go*EXP(-t/tau). In ABAQUS, the normalized shear modulus for one term in Prony series is given as: g(t)=Go(1-g1(1-EXP(-t/tau)). The parameters that must be entered in ABAQUS are g1 and tau. For Maxwell (in our case) G(t=infinity)=0.

Consequently, g1=1-G(t=infinity)/Go=1. ABAQUS requires that g1 must be less than 1. Has anyone encountered this problem?

thanks

Ah