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Updated: 9 hours 25 min ago

Thank you, Marco.  I am glad

Fri, 2023-03-17 12:36

In reply to I am speechless. Outstanding

Thank you, Marco.  I am glad somebody still cares about this topic!  David

I am speechless. Outstanding

Thu, 2023-03-16 10:59

Re. Analysis of diffraction data

Thu, 2023-03-16 00:56

In reply to Journal Club for March 2023: Operando characterization of additive manufacturing process using high energy synchrotron source

Thanks Tao for the comments, 

1-Powder diffraction peaks exhibit asymmetry even before printing, which may partly be an artifact. Nonetheless, as the process advances, changes in peak shape occur, which I believe contain real structural information. Notably, during the initial phases of solidification, the peak shapes experience considerable changes mainly because the exterior of the bead cools faster than its interior. Peak splitting specially at the later stages of solidification could be due to elemental segregation.

2. Not yet, would be an interesting future work.

3. I agree, perhaps we can catch up during TMS to discuss this further!

Analyses of diffraction data

Mon, 2023-03-13 13:58

In reply to Journal Club for March 2023: Operando characterization of additive manufacturing process using high energy synchrotron source

Very nice discussion on the in situ diffraction data! I have a few questions and comments.

1. Diffraction peaks in Fig. 2 appear to be asymmetric. Some even split into multiple peaks. Any clue why this is the case? Are these artifacts or they contain real structure information? Did the cooling-induced diffraction peak shift captured in one diffraction pattern due to the long exposure?

2. The discussion on the grain morphology (Fig. 3) is very interesting. Have you measured the creep performance of these samples to correlate it with the fractal grains?

3. Analyses shown in Figs. 5 and 6 point to a new direction for extracting more structure information from these in situ diffraction data. There are too many factors in the AM process that may alter the diffraction pattern. Although I feel the real situation may be more complex than the authors described, this is certainly a good starting point to expand discussion.

Thanks Darren for the comment

Fri, 2023-03-03 22:36

In reply to Monitoring Stress Evolution in the Future?

Thanks Darren for the comment,  I think to improve the spatial resolution of X-ray measurements, measures can be taken during both data acquisition and analysis. Using a highly monochromatic beam during data acquisition may be beneficial, as well as utilizing detector images without data reduction and integration during analysis


Fri, 2023-03-03 19:32

In reply to A note to Prof. Sukumar the JPBTI (Metallurgy not even Mechanical or CS) of IIT Bombay


Your high-school drop-out, namely the Bill Gates is a fucked up asshole. Take it from me. Honest.





Why are you silent you Prof. Dr. Amit Acharya of CMU?

Fri, 2023-03-03 19:19

In reply to A note to Prof. Sukumar the JPBTI (Metallurgy not even Mechanical or CS) of IIT Bombay

Hey beautiful hand-writing of the kut-kut-kut deductive reasoning kind Amit graduated by Indian School of Mines, Dhanbad,

So what you graduated a Sawant? Huh?

He was [if I recall it right] only a fucked up graduate of an IIT --- in particular, IIT Bombay.

Bastard Amit Acharya. Never get in my way. Got it, you complicated, and hence, an American, an Indian Brahmin?


Do the best with the rest of your life.




So, how are you doing, you idiot Brahmins?

Fri, 2023-03-03 19:12

In reply to A note to Prof. Sukumar the JPBTI (Metallurgy not even Mechanical or CS) of IIT Bombay

So, how are you doing, you idiot Brahmins?

But I am really against those Brahmins (idiots, as usual, whether JPBTI or otherwise), who went against giving the Timoshenko to Zhigang. It was a very obvious one, years ago, no?

But these third class! (I look at you you my senior by age K. Ravi Chander or whatever way you spell your name, or your cousins in New Delhi! Integrity is something else altogether, got it, at least now? you K. Ravi Chander somewhere in Texas, the last time I looked up your CV / bio, and I am fucking sure you would die but never even pretend being a Brahmin that you looked up my CV or my research paper, huh?)


Monitoring Stress Evolution in the Future?

Thu, 2023-03-02 20:24

In reply to Journal Club for March 2023: Operando characterization of additive manufacturing process using high energy synchrotron source

Nice description of current work.

These in situ synchrotron measurements are great at monitoring microstructure evolution and large thermal lattice distortions as they produce commensurately large changes to diffracted signal. Do you have thoughts on the path forward for monitoring mechanical response / stress evolution which produces much subtler changes in diffraction patterns?


Mon, 2023-02-27 12:21

In reply to A fully-funded Ph.D. student position at the University of Oklahoma

The position has been filled.


Mon, 2023-02-27 12:20

In reply to Fully-funded Ph.D. student positions at the University of Oklahoma

The positions have been filled.


Fri, 2023-02-24 14:37


It gives us great pleasure to announce the Euromech Colloquium “CELLULAR MECHANOBIOLOGY AND MORPHOGENESIS” to be held in Sirmione, Italy, 21-24 August 2023 (


The Colloquium provides a unique forum for scientists and engineers across the world to exchange ideas and identify new research directions toward understanding mechanobiological processes in the human body, contributing to modern medicine and shaping a safe and healthy future. Research breakthroughs in the field require an immense multidisciplinary effort, including novel imaging and measurement techniques as well as advanced theoretical and computational models. The focus of this Colloquium is to explore the mechanics of cytoskeletal contractility and protrusion, migration, adhesion, ECM remodeling, morphogenesis, and nuclear mechanotransduction.

Third Class Stanfordians

Fri, 2023-02-10 19:09

In reply to No, Sir, No!

I think I said it right.

Against Savitri Mumukshu and Sudha and more Brahmin women of their kind.

Tell me, Sudha, who is dear to you: Savitri Mumukshu, or SidlaaghaTTa who would steal my info via my Aadhaar Card but not give me IIT Kanpur or IIT Bombay job?


Tell me, Sudha, Kulkarni's daughter, blessed by a "baaurat-ratna", a fortune I could never have had because I was born not just a man but a very proud and an independent and original one (a lot many including SidlaghaTTa and your brother at CalTech could not manage)?


Just a Jadhav. You know, ... Ok, now you know: "khaashaabaa Jaadhav"? the kustigeer? hmmmm.

We work, we die.

The second part does not matter. Not to us. The first part does. Did. So that your lovely Brhamins grab the fucking tons of it! Got it, Sudha? Hmmm.. Not born without being born wherever and whatever.... Ajit. R. Jadhv. THird class University of Pune Bastard VC asking for Mother's Identification was a Bastard.

He was a bastard. He was looking for his mother.

Mother-fuckers. 1975 Indian Women Worshippers. Mother Fuckers.


I am honest.


I will tell you everything. Yes, Yheverithingg.

You juss ass.k Sudhaa.


Now, in compensation for never giving my talent a job in your Fucked Up Infosys.


Get in touch,will you? Do you have the fucking courage?



Kulkarni's. From karnaaTaka. Rich. Fucking. Brahmins.


Why not compare monolayer copper or gold specimens?

Sun, 2023-01-22 10:49

In reply to Dear Roy,  Thank you for

AFM analysis for mechanical study could be complex and difficult. In order to validate the correctness of the measurement, one monolayer material does not suffice. It is suggested that different monlayers made of different material should be compared.

Young's modulus is little affected by treatment

Sun, 2023-01-22 10:26

In reply to Hardening Ductile Iron

Hardness is an indicator or imprint of treatment, while elastic modulus of metals is little affected by treatment like heat treatment.

Hardness depends on loading condition.

Sun, 2023-01-22 09:59

In reply to Relationship between Hardness and Elastic modulus?

Simply speaking, hardness depends on loading condition, while mechanical properties of material should not depend on loading condition, and hardness cannon be intrinsic property of material. While, for a certain class of material, for example, bulk metallic glass, or a kind of ceramics, there exists linear relationship between hardness and elastic modulus, which is very interesting. You may contact me for the relevant references via or 

Stress triaxiality is involved in sharp indenation.

Sun, 2023-01-22 09:55

In reply to Modulus - Potential Well - Hardness

Stress state is complex during indentation.

Abaqus is recommended to simulation contact deformation

Sun, 2023-01-22 09:47

In reply to cylindrical flat-ended tip indentation on Rubber

You may try ABAQUS.

Please send a cover letter,

Wed, 2023-01-18 15:54


Please send a cover letter, CV, and publications to with the subject “Neurovascular Post-doctoral fellow”.  We will contact short-listed candidates to arrange for interviews.

Neuromuscular mechanics

Wed, 2023-01-18 15:54


The Department of Neurology, Dell Medical School, and the James T. Willerson Center for Cardiovascular Modeling and Simulation, Oden Institute, have a jointly administered opening for a Post-doctoral Fellow in the area of Neurovascular mechanics derived from clinical images.


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