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Nowinski Lecture

Professor Yonggang Huang from Northwestern University presented this
year's Nowinski Lecture at the University of Delaware on 12/5/2008, http://www.udel.edu/udaily/2009/nov/nowinskilecture112108.html.

Buckling in thin cylinders Ansys. Urgent!!

Hi,

I'm trying to conduct buckling analysis on thin cylinder under external pressure using Ansys 10.0. Can some one please guide me on how to perform it... its urgent ...

Thank You

Aabhas

ramdas chennamsetti's picture

Theories of Failure in Strain space

Hi all!

In theories of failure (e.g von-Mises, Tresca, Max. principal stress etc), yield funcion,          f(sigma ij, Y) = 0 is plotted in principal stress space (sigma 1, sigma2 and sigma 3). Why shouldn't we express the same yield function, f(epsilon ij, epsilon Y) = 0 and plot in principal strain space?

Y = Yiled stress, sigma ij = stress ij, epsilon ij = strain ij. and espsilon Y = Yield strain = Y/E,   E = Young's modulus

Any thoughtful comments???

With regards,

- Ramdas

MichelleLOyen's picture

Female Science Professor-- blog and book

Nature recently favorably reviewed a new self-published book, based on a blog , by a "female physical sciences professor" in the US.  While the overarching theme is clearly about being a female in a male-dominated world, the writings on the blog (and in the book) are in many places general and provide lots of good advice and anecdotes about acadmic life.  The

The comparison between practical measurement and simulation model results

Under the practical manufacturing process, metal parts will deform according the loads exerted on them. I did some practical measurement on the mentioned metal parts before and after the deformation.e.g.Heat treatment, the metal parts could be expanded or screwed.The postions I used to measure the dimension of the metal part could not be traced.Simply to use the difference of the widths at some specific positions, for example, has non-sense to indicate the deformation of the metal parts.On the other hand, I could use Catia to simulate some deformations of the metal parts.

chunhui yang's picture

a strange question about the Euler beam buckling?

I have a beam whose two ends are roller condition which means one end is zero moment and zero displacement and the other end is zero moment but can have the displacement only along the beam axis. Then the compression force is applied on this end along the beam axis.

regarding orthognal machining chip propagation usng abaqus

hi am doing my project on high speed machining of aluminium and steel. for chip propagation i want some procedure how to do crack/fracture analysis using ABAQUS. if anybody knew about this please send me information regarding steps involved in building crack propagation.if any practile examples or tutorials are available for this send me to my mail id. my mail id is sasivamsi@gmail.com. am using ABAQUS V6.6.

Euler's buckling formula

Hi, everyone,

I am new here. Now I am doing a research which is related to the Euler's buckling formula.  It is known that when the cylinder is thick enough, Euler's buckling formula is no longer valid. I want to know in which region of slenderness(aspect ratio) of a cylinder or column that the Euler's buckling formula is valid. Is there any analytical study or numerical results about it? Is there any suggestion or paper I can find?

 Thank you very much! 

arash_yavari's picture

A Discrete Cohesive Model for Fractal Cracks

The fractal crack model described here incorporates the essential
features of the fractal view of fracture, the basic concepts of
the LEFM model, the concepts contained within the
Barenblatt-Dugdale cohesive crack model and the quantized
(discrete or finite) fracture mechanics assumptions. The
well-known entities such as the stress intensity factor and the
Barenblatt cohesion modulus, which is a measure of material
toughness, have been re-defined to accommodate the fractal view of
fracture.

Wei Hong's picture

Multiple tenure-track faculty positions at Iowa State University

The Department of Aerospace Engineering at Iowa State University invites applications for multiple tenure-track faculty positions at the assistant, associate, or full professor ranks to begin August 2009. Applicants are sought in all areas of aerospace engineering and engineering mechanics but preference will be given to those with interest and expertise in aerospace structures/mechanics of materials, multidisciplinary design and analysis, experimental thermal-fluids, propulsion, wind energy, and wind engineering.

Jizhou Song's picture

Researchers Make New Electronics – With A Twist

Cover

PNAS 105, 18675 (2008) 

Dae-Hyeong Kim et al from Prof. Rogers’ group (University of Illinois), Prof. Jizhou Song (University of Miami), Prof. Yonggang Huang (Northwestern University), and their collaborators at IHPC in Singapore and Tsinghua University just published a paper as the featured cover article in PNAS.   

MichelleLOyen's picture

Post-doctoral fellowships in Bioengineering

Highly competitive candidates are sought for locally-funded fellowships in biomechanics at Cambridge University.  The Next Generation Fellowships are being advertised through the new Centre for Trophoblast Research, an interdisciplinary research centre focused on the trophoblast, the critical cell in the development and function of the placenta. 

zishun liu's picture

Online submission system for International Journal of Applied Mechanics (IJAM) is now LIVE

World Scientific is proud to announce the launch of a new online submission system, Editorial Manager (EM), for International Journal of Applied Mechanics (IJAM). One of the industry standard systems used by major academic publishers, EM provides a full online solution for manuscript submission, peer-review, and tracking.

    Christophe.Eloy's picture

    ABSTRACT SUBMISSION: Fluid and Elasticity 2009, 23-26 June 2009, France

    Dear Colleagues,

    The deadline for submitting an abstract to the international
    conference "Fluid and Elasticity 2009" is approaching.

       ABSTRACT SUBMISSION DEADLINE: DEC. 19

    To submit your abstract, please follow the instructions on:
    https://www.irphe.univ-mrs.fr/%7Efe09/abstracts.html

    Multiple positions in experimants and CFD

    Multiple, assistant researcher/research scientist/postdoctoral positions are available in a large, 4-year duration, Department of Defense program on “Release, Atmospheric Dispersal, and Environmental Fate of Liquid Agents”.  The effort is aiming to: (a) achieve a basic understanding of the physics of aero-breakup and dispersal of liquid agents in high-speed flows, (b) achieve a basic understanding of impact/spreading/absorption/reaction/evaporation of drops falling on various substrates, and (c) develop and validate computational tools covering the hierarchy of scales involved and purposes

    Diane R Wagner's picture

    17th Annual Symposium on Computational Methods in Orthopaedic Biomechanics

    ANNOUNCEMENT AND CALL FOR ABSTRACTS. 17th ANNUAL SYMPOSIUM on COMPUTATIONAL METHODS IN ORTHOPAEDIC BIOMECHANICS, http://www.pre-ORS.org, Saturday, February 21st, 2009, University of Nevada, Las Vegas, Las Vegas, Nevada.

    Online Registration & Abstract Submission Deadline: December 8, 2008

    Help in Modeling Redefine Material Properties in ABAQUS

    Hi everyone,

    I am using ABAQUS to simulate the soil earth pressure around a buried concrete pipe. Based on reading different threads posted. I knew that there are two ways to simulate the process of excavation and the pipe placement and backfilling.

    Book for beam theory

    Choose a channel featured in the header of iMechanica: 

    Can any one suggest me book for detailed study for Timoshanko And Euler Burnoulli Beam theory?

    VUMAT and ALE in ABAQUS

    Hi all,

         Here I encoutered a error in ABAQUS when I include ALE with VUMAT. When ALE was not included with VUMAT, my job can work well while with the combination of VUMAT and ALE, the job cann't work any more due to a "Signal 8" error. And if I use a built-in material model and at the same time ALE, a job can work. Furthermore, element failure is considered in all of the cases.

        Anyone can give some suggetion? Thanks in advance!

    Xinke

    Thermonuclear energy by shock waves


     

                        The reasons of the failure of initiative

              the thermonuclear reaction by shock waves

     

          1.The failure.

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