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Updated: 3 hours 30 min ago

Energy barrier of the bistable structures

Sun, 2021-07-18 16:40

In reply to Journal Club for July 2021: Computational Design of Compliant Mechanisms

Dear Jessica, Wei-Hsi, and Cynthia,

Thanks a lot for the very interesting summary. It is a very nice integration of mechanics design and funtional structures.

I have some questions about the example in Figure 2 and also general multistable structures. Your analysis currently focues on the two extrme forces at the stable states. Did you analyze the energy barriers between the stable state and the transition state (saddle point in the energy lanscape)? How the forces and energy barriers can be related to your structure design?

More specifically for the soft hyrbrid aerial vehicle, you used interia to help the snap through deformation. Although it is indeed a dynamical force, I feel it is more like an energy impulse (kinetic energy) to the system. Therefore, the structure may not be strictly under force-control loading, and the energy barriers may be a more accurate cretiera to determine the transition process. 

Another question is about the absolute values of F1 and F2. I noticed you are maximizing their difference with constraints making the structure bistable. If one of the force is very small, the state may be easily perturbed by eviromental nosie. Is there strategy to set a reasonable values of the forces which can also be acheived?

Best,

Teng

Thanks for the notes

Sat, 2021-07-17 02:30

In reply to Engineering Sciences 241: Advanced Elasticity

I appreciate these great notes. However, some of the links either do not work or they are linked to the wrong content. I would appreciate some amendments. Thanks.

Very nice explanation

Sat, 2021-07-17 02:15

In reply to A state of stress is a linear map

Simple and elegant! Without going through the details of tensor algebra, you have represented stress in its core meaning---something that is not commonly acknowledged.

Problem solved

Mon, 2021-06-21 01:22

In reply to Please Help solving VEM with finite strains per Wrigger's paper.

I had an error in how I was calculating some fundamental quantities.  The formulation works just fine as described in the paper by Wrigger's et al.

Thanks

Sun, 2021-06-20 06:01

In reply to congratulations for another book

Thanks, Sheng.

Vlado

Dear Prof.,

Tue, 2021-06-15 17:22

In reply to Postdoctoral Position - Multiscale Mechanics and Materials

Dear Prof.,

I am interested in the postdoc position. I have sent an email to your email address with my updated CV.

Updates

Sat, 2021-06-05 11:58

 Dear Prof. Susmel,

Fri, 2021-06-04 13:28

In reply to Theoretical and Applied Fracture Mechanics' live webinar by Prof. Ali Fatemi & Prof. Darrell Socie - Friday 4 June at 2.30 PM GMT (3.30 PM BST)

 Dear Prof. Susmel,

 I miscalculated the session time and missed it. I am wondring if I can have the recorded file of the webinar. Thanks.

 Sincerely,

Arash P. Jirandehi 

The position has been filled.

Sat, 2021-05-29 10:32

My pleasure.

Tue, 2021-05-25 07:18

In reply to Thanks for sharing!

My pleasure. I have shared 2 other MD models here: https://imechanica.org/node/25201

The webinars are organized in

Mon, 2021-05-24 14:43

In reply to Open webinar on Metamaterials, Glaucio Paulino, May 28, 5:00PM-7:30PM, CET

The webinars are organized in the framework of the dissemination activities of PRIN project “Multi-scale mechanical models for the design and optimization of micro-structured smart materials and metamaterials” (grant n. 2015LYYXA8), coordinated by Prof. Alberto Corigliano (Politecnico di Milano) in collaboration with Prof. Davide Bigoni (University of Trento), Prof. Guido Borino (University of Palermo), Prof. Luigi Gambarotta (University of Genova), Prof. Elio Sacco (University of Naples), and Prof. Elena Benvenuti (University of Ferrara).

Open Webinar, Glaucio Paulino, May 28, 17:00 CET

Mon, 2021-05-24 14:42

In reply to Open webinar on Metamaterials, Glaucio Paulino, May 28, 5:00PM-7:30PM, CET

The webinars are organized in the framework of the dissemination activities of PRIN project “Multi-scale mechanical models for the design and optimization of micro-structured smart materials and metamaterials” (grant n. 2015LYYXA8), coordinated by Prof. Alberto Corigliano (Politecnico di Milano) in collaboration with Prof. Davide Bigoni (University of Trento), Prof. Guido Borino (University of Palermo), Prof. Luigi Gambarotta (University of Genova), Prof. Elio Sacco (University of Naples), and Prof. Elena Benvenuti (University of Ferrara).

What is the problem with my UMAT?

Thu, 2021-05-20 11:22

In reply to Sharing ABAQUS UMAT and VUMAT subroutines

Hello everybody, I've implemented a UMAT subroutine and I debugged it for one plastic increment. There is a problem that when one increment ends, and the stress and all state variables are saved for one increment, in the beginning of the next increment I expect that I have the same stresses and state variables while it is not the case (the most strange thing is that, after one plastic increment that my state variables are updated (which are not zero), for the next increment it sets all of them to be equal to zero). Can someone tell me what is the problem and how should I solve this problem? regards,Faezeh

Even if you ignore the

Mon, 2021-05-10 07:54

In reply to Sharing ABAQUS UMAT and VUMAT subroutines

Even if you ignore the initial price, you need an Intel XE compiler. The compiler needs Visual studio. And an Intel GPU. 

Paper online

Fri, 2021-05-07 01:05

In reply to Thank you

Dear Shaoting,

The paper is not online yet, probably soon, but I can forward the manuscript to you.

Best,

Mutian Hua

Got it!

Wed, 2021-05-05 00:59

In reply to Update Response to Shaoting

Dear Mutian,

Sure. Thanks.

Best,

Shaoting

Thank you

Wed, 2021-05-05 00:55

In reply to Response to Shaoting

Dear Ximin and Mutian,

Got it. Thanks a lot. May I know if the paper "Tough-hydrogel reinforced low-tortuosity conductive networks for stretchable and high-performance supercapacitors" is online?

Best,

Shaoting

Update Response to Shaoting

Wed, 2021-05-05 00:51

In reply to Hearty Congratulations to Ximin

Shaoting, sorry I wasn't able to upload figures in the comments. The figure related to your first question can be found in Figure S9 of the paper "PVA hydrogel with broad-range tunable mechanical properties via Hofmeister effect".

---Mutian Hua

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