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# stress

## How are principal planes & eigen vectors of the stress tensor related ? | An intuitive explanation

Sun, 2017-07-23 00:17 - rajan_prithiviTo obtain the principal planes we construct the stress tensor and find the eigen vectors. Here is an attempt to explain it more intuitively rather than the use of the formal mathematical method. Hope you enjoy this video!

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This is an educational outreach initiative targeted at all engineers interested in mechanics and seek simpler explanations. Kindly share if you learn something out of this !

Here is the link to the VIDEO

## What are Principal Stresses (explained without math equations) ?

Sun, 2017-07-02 09:46 - rajan_prithivi

In the following video, I have tried to explain the **concept of principal stress in a** **more physical way and without involving any mathematical equations**, hope you can easily imbibe the concept.

Here is the link to the video : Principal stresses

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## Failure of brittle materials using simple experiments- Part 2

Mon, 2017-06-26 12:44 - rajan_prithiviHere is my second video, where I tried to explain the concepts of stress state, principal stresses, Mohr circle and failure theories in layman's language and associated these concepts to explain the failure of a brittle material. This is an educational outreach initiative mainly targeted at the undergraduates (mechanical/civil/aerospace and materials engineering) studying mechanics and also other me

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## Concept of state of stress in a simple way

Thu, 2017-06-22 14:59 - rajan_prithiviI tried to explain the concept of state of stress in a simple way, here is the link to the video - state of stress

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## STRESS TRIAXIALITY

Tue, 2014-12-09 22:12 - albannaDear ALL,

Which reading material/source that describes the good understanding of stress triaxiality?

What is the role of stress triaxiality for FE analyst?

I have read a lot of papers/articles but still have confusing me on the fundamental of stress triaxiality.

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## How obtain tension strain concrete(σt0) in damaged plasticity model in ABAQUS?

Sat, 2014-12-06 18:18 - siren300How obtain tension strain concrete(σt0) in damaged plasticity model in ABAQUS?

hello engineers

i need help about concrete damaged plasticity

fo example :

if Compressive stress (Fu)= 51.2 MPa

and tension stress (σ t)=0.3 x 51.2^(2/3)=4.136

1)why (σ t) is 2.36 in picture(uploaded)?

2)what is tension strain ? and how? i cant understand.

i cant obtain εt = total tensile strain.

how obtain εcr ?

please help

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## New Ebook on Elastic Solids at Amazon

Fri, 2013-06-21 15:07 - Carl T. Herakovich
This treatise provides a broad overview of the definitions of

fundamental quantities and methods of analysis for the use of solid materials

in structural components. The presentation is limited to the linear elastic

range of material behavior where there is a one to one relationship between

load and displacement. ** **Fundamental

methods of analysis and typical results for structures made of elastic solid materials

subjected to axial, bending, torsion, thermal, and internal pressure loading;

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## Sr. Packaging Mechanical Analyst at Apple

Thu, 2013-01-03 19:56 - Jie-Hua ZhaoSr. Packaging Mechanical Analyst

- Job Number: 25557504
- Santa Clara Valley, California, United States
- Posted: Jan. 3, 2013
- Weekly Hours: 40.00

**Job Summary**

Mechanical engineer working in the central IC packaging group.

**Key Qualifications**

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## History of Bueckner’s principle?

Tue, 2012-10-09 13:44 - Mike PrimeI am hoping someone has some historical knowledge of some

interesting mechanics, or just an interest to discuss it. A superposition principle is widely used to solve crack problems, with illustrations like these:

http://ars.sciencedirect.com/content/image/1-s2.0-S0142112308002211-gr1.jpg

http://ars.els-cdn.com/content/image/1-s2.0-S0142112399000778-gr2.gif

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## how to find theoritically stress along thickness direction

Mon, 2012-06-18 07:04 - raja_0026hi

A composite 3D plate is subjected to tensile load and whilethe otherend is fully comnstrained. how to findstress along the thickness for theoritically

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## stress at interfacial Guass point

Thu, 2012-02-23 04:43 - woshimaidi

hello,

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## stress at interfacial Guass point

Thu, 2012-02-23 04:39 - woshimaidihello,

I have encountered a problem to calculate the stress at interfacial Guass point of each hexahedron element. Since the effective stress is needed to decide whether a cohesive element should be inserted when using the extrinsic cohesive element model, the stress at interfacial Guass point of each element is chosen to calculate effective stress. In the calculation process, the stress at Guass point of each hexaderon element can be obtained.Is there anyone who knows how to calculate the interfacial stress accurately? I would appreciate your comments.

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## ABAQUS CRACK PROPAGATION

Thu, 2012-02-16 06:31 - surendran47how to do a crack propagation analysis?

can abaqus be used for doing crack propagation analysis for plates with multiple cracks?

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## Stress/strain of a body performing a translation

Wed, 2011-07-13 06:05 - ljpoposkiHello all,

I am having task to determine the strength analysis (stress/strain) of a translating machine part (body). The part is driven by a set of gears, placed on the top of the body. The input is a constant acceleration value to the propultion engine. Firstly I should do a 2D analysis with a retangle representing the machine part.

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## Lode Angle History?

Mon, 2011-05-02 12:34 - mswanAll,

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## MRC Elsevier Distinguished Lecture, NJIT, Monday 18 April 2011

Thu, 2011-03-03 11:28 - Dan Lovegrove
Elsevier is pleased to announce that Professor Sia Nemat-Nasser will be presenting **'Managing Stress Waves Over Multi-frequencies by Micro-architectural Design of Materials'**, the *Mechanics Research Communications* Elsevier Distinguished Lecture (sponsored by Elsevier and the New Jersey Institute of Technology Granular Science Laboratory). The lecture will take place in the Guttenberg Information Technologies Center, NJIT, on Monday April 18, 2011, 11:30 a.m. - 1:00 p.m. Full details are available at

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## How to supply a visualization for the displacement gradient tensor

Mon, 2010-10-25 04:06 - Ajit R. JadhavHi all,

[Warning: The writing is long, as is usually the case with my posts :)]

It all began with a paper that I proposed for an upcoming conference in India. The extended abstract got accepted, of course, but my work is still in progress, and today I am not sure if I can meet the deadline. So, I may perhaps withdraw it, and then submit a longer version of it to a journal, later.

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## What is stress? Who has ever seen stress? Is stress a physical quantity?

Fri, 2010-09-10 07:44 - Yi-Heng Chen**What is stress? Who has ever seen stress? Is stress a physical quantity?**

Professor Yi-Heng Chen, Xi’an Jiaotong University, 710049, P.R.China

e-mail: yhchen2@mail.xjtu.edu.cn

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## Mohr's Circle---When Was the Last Time You Used It in Your Professional Engineering Work?

Thu, 2010-06-03 13:01 - Ajit R. JadhavAs a consultant in computational mechanics, I currently help write some FEM-related code, and while doing this job, an episode from a recent past came to my mind. Let me go right on to the technical issue, keeping aside the (not so good) particulars of that episode. (In case you are curious: it happened outside of my current job, during a job interview.)

If you are a design engineer, FE analyst, researcher, or any professional dealing with stress analysis in your work, I seek answers to a couple of questions from you:

**Question 1:**

## Confusion in understanding Hydrostatic Stress context to failure

Sat, 2010-02-20 01:52 - priyadd84- Read more about Confusion in understanding Hydrostatic Stress context to failure
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## Writing User Subroutines with ABAQUS

Thu, 2010-02-11 04:26 - Ahmad RafsanjaniDear All,

I think that many students are looking for some tutorials about writing a UMAT in ABAQUS.

You can find a comprehensive tutorial for elastic problems.

This file contains:

• Motivation

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## The Meaning of the Concept of Potential in Mechanics (and in Physics)

Sat, 2009-08-15 06:08 - Ajit R. JadhavIf someone knows of books/articles dealing with the meaning of the concept of potential in physics (or concerning the physical bases underlying the energy methods of mechanics) then I would very much appreciate getting to know about these.

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## Wondering about the Mechanics of Bacterial Death

Sat, 2009-08-15 05:48 - Ajit R. Jadhav0. I was idly thinking about the current H1N1 flue pandemic, and the following things occurred to me. Please note, I know very little about this subject matter. So, please consider descriptions in the following as, at best, tentative.

1. There is a basic difference between how alcohol kills viruses and how salt-water kills bacteria. [Alcohol is used in the hand-cleaners they use in hospitals. Girgling with salt-water is the first line of defense (and an unexpectedly highly effective one) which is well known for millenia.]

But the mechanisms involved are different.

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## how to show the stress in the thickness direction when you use the shell element with abaqus

Mon, 2009-05-04 04:32 - hua_2001hello,

- i simulate some process using shell elment, i find the results have big difference between abaqus and lsdyna. the abaqus results always show the stress in the thickness direction is zero. but the lsdyna is not. i don't know why? if some one know that, please give me some suggestions. i heard that the abaqus can not show that stress component. if not, how can i do to calculate that and fill it into the results file (.fil file). thank you!

## Producing Stress Analysis from Strain data

Sun, 2009-02-15 18:36 - G RezkI am doing research on the stresses that are produced when a retainer (a thermoplastic sheet) is placed on the teeth. We've designed the project so that we take an initial scan of the sheet and a final "shifted" scan of the sheet. We'd like to compare, find the strain, and calculate the stress neccessary to produce this strain.

I was hoping to use FEA for this...is it possible? I have access to Abaqus and Ansys, and where can i find the commands that allow me to do this.

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