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# rajan_prithivi's blog

## How do I do multiple restarts is ABAQUS ?

Tue, 2019-03-26 17:30 - rajan_prithiviHello All,

I have been trying to restart an ABAQUS simulation using the command line. The following works fine

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abaqus job=restart1.inp oldjob=OLD user=UMAT.f cpus=160 scratch=$PWD interactive

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But when I do the restart for the second time like the following, It gives me an error

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## Critical porosity in the fatigue of additively manufactured IN718 via crystal plasticity modeling

Mon, 2019-03-25 15:33 - rajan_prithivihttps://doi.org/10.1016/j.matdes.2018.04.022

Highlights

1. Critical porosity is estimated in additively manufactured IN718 via crystal plasticity.

2. Porosity is characterized using high resolution tomography.

3. Non-local damage indicator parameters identify the location of fatigue crack initiation.

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## Real life example of Eigen values and Eigen vectors

Thu, 2019-03-07 00:19 - rajan_prithiviEigen values / vectors finds applications in most engineering disciplines and also in basic sciences. In this video, I tried to explain the meaning of Eigen values/vectors in a simple way and gave a real life example of the same. Here is the LINK to the video.

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## Stress concentration explained without math equations

Sat, 2018-04-14 23:53 - rajan_prithiviThis VIDEO gives a very intuitive explanation of stress concentration with an analogy and an experimental demonstration.

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## Principal Stresses explained with an experiment

Sun, 2018-04-08 23:24 - rajan_prithiviThis video explains the concept of principal stresses using an experiment

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## Visualizing bending and torsional deformation using experiment

Sun, 2018-04-01 11:45 - rajan_prithiviThis video contains an experimental demonstration of a simple bending and torsion and further speculate the nature of stresses induced by the respective loading scenarios

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## von Mises Stress - Motivation, and Its relation to octahedral shear stress and J2 Invariant

Sun, 2018-03-25 22:29 - rajan_prithiviThis video gives a basic introduction to von mises stress, which is widely used in the structural analysis & design.

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## Isotropic & Kinematic hardening

Wed, 2018-02-28 00:59 - rajan_prithiviThis video gives a basic overview of the most fundamental hardening models of plasticity, which are the isotropic and kinematic hardening

Hope this helps!

- Prithivi

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## Basics of plasticity theory in 6 min

Sun, 2017-11-26 00:01 - rajan_prithiviThis video explains the very fundamental points with regard to plasticity theory. It covers the following -

1) Why study plasticity ?

2) Additive decomposition of strain

3) stress and strength

4) Yield condition , flow rule & hardening rule

-Prithivi

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## Overview of solid mechanics

Sun, 2017-10-08 02:07 - rajan_prithivi

This video (LINK) attempts to give the big picture of solid mechanics along with the brief explanation of the constituent topics.

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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 !

Thanks,

Prithivi

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## 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

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## 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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## -----

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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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## Failure of brittle materials using simple experiments -Part 1

Thu, 2017-06-15 15:50 - rajan_prithiviBelow is the video link to my first lecture video, where in I tried to demonstrate the failure of brittle materials using simple experiments.

https://www.youtube.com/watch?v=yG76IhmKyRY&t=1s

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