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Nominal vs. net strength

Submitted by Echeban on
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I have difficulty accepting the definition of "nominal strength" and "net strength" given in Shigley's Mechanical Engineering Design.

Consider a plate of width w, thickness t, with a hole of diameter d centered at w/2, loaded with force F.  

Shigley's says: the "net stress" is \sigma_net=F/(wt) and the "nominal stress" is \sigma_nominal=F/((w-d)t). ==> I think he is wrong!

According to: http://dictionary.reference.com/

Net:

— noun

New educational program: MSc Advanced Dynamics of Discrete and Continuum Systems

Submitted by Igor Berinskii on
education
Master program
dynamics
mechanics

St. Petersburg State Polytechnic University (Russia) opens a new MSc program in mechanics and mathematical modelling. The program is designed for training highly professional scientists and engineers with the theoretical background and practical experience in theoretical mechanics, computational mechanics, IT, mathematical modelling and simulations, and distributed computing.

Bridgman and tensile test

Submitted by admp on
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tensile test
Bridgman

Dear all I came up with some stress distributions which exist in a cylindrical specimen in a tensile test. However, I cannot understand how these formulas were gotten. There is a reference to a Bridgman paper (1944). Is there anyone who can give some inputs abouts this?

 

Thanks in advance 

Workshop on Microfluidics : Nanofluidics : Multiscale CFD, Registration deadline extended

Submitted by smitra on
education
microfluidics
Nanofluidics
Lattice Boltzmann Method

Please join us for a national workshop on Microfluidics and Nanofluidics near Delhi, India during 14-16 July 2014. We are happy to have some higly accomplished academician in multiscale CFD domain. Prof. Suman Chakraborty, Bhatnagar Awardee 2013 will be principal instructor and speaker in the event.

http://www.iitkgp.ac.in/fac-profiles/showprofile.php?empcode=bTmVW

Novice ABAQUS user seeking advice on damaged plasticity reinforced concrete model

Submitted by BenWu on
education
embedded elements
reinforced concrete with damaged plasticity

Hi
all,

 I
am an ABAQUS novice working on a graduation project.  My model is a
reinforced concrete Tee-joint with steel rebars and stirrups embedded to the
concrete.  The concrete is modeled using the Damage-Plasticity model, with
mostly default suggested values.  The elastic and plastic values are
derived from experimental values.  In addition to the embeddment, the
column and the beam is tied together using the tie command.  The model is
subjected to an axial load as well as a displacement force. 

New introductory course in structural mechanics opens on edX

Submitted by ssocrate on
education

2.01x: Elements of Structures is a new introductory course in structural mechanics that just started on edX. Anybody can  register  to audit the course for free. 



Course material includes lecture videos, tutorials, example problems, recitation problems with video walkthrough, homework problems, "boardnotes" (condensed lecture notes) and synoptic tables.



Homogenization - If materials in the model are isotropic, is it possible to get truly anisotropic resulting material?

Submitted by Artjoms Salikovs on
education
homogenization
Homogenization - Elasticity
computational homogenization

Hello,

I read that "In general, even if the materials on the micro-level are isotropic, the effective 

material can show anisotropic behavior. A general anisotropic linear elastic material 

may have twenty one independent material parameters.''

 

If I understand my results correctly then simple structures like ''ball in the unit cell'' result in orthotropic material.

I am a bit puzzled - what would be the simplest structure that would result in anisotropic material behaviour?

Please recommend a good mechanics of material book

Submitted by Wenbin Yu on
education

I am teaching mechanics of materials to sophomore. However, our students do not have a separate static course. They get a some exposure to free body diagrams in particle dynamics. I am currently using the book by Gere and Goodno. But I found that both the teaching and learning experience were not good. Thanks a lot in advance for your suggestions!

 

Wenbin  

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