User login

Navigation

You are here

Comments

Subscribe to Comments feed
Comments
Updated: 6 hours 33 min ago

Very sad to hear this loss.

Sat, 2021-03-27 04:14

In reply to A tribute to Arthur Peter “Art” Boresi

Very sad to hear this loss. May his soul be at peace with the Heavenly Father.

I use his book "Adavanced Mechanics of Materials" for teaching my PG Students.

Dear Jie,

Fri, 2021-03-26 10:35

In reply to Other kirigami design and beyond

Dear Jie,

Thank you very much for your comments. 

1) You are right and the pioneer works from Prof. Yonggang Huang, and Prof. John A. Rogers groups have shown the potential of out-of-plane kirigami structure in compression. The main difference of their works with examples of kirigami metamaterials presented here is the requirement for pre-stretched substrates to enable local buckling of cuts and restrict the global buckling of the whole structure (given the small thickness of the kirigami sheet) while in tension, this is not the case.

2) The recent works of Prof. Daraio's group are very interesting for programming 3D shapes. I am wondering if we can achieve such 3D shapes solely by cuts without removing the material?

3) Thank you for sharing the fresh work from your group. This is very interesting because it opens the possibility of actuating kirigami from the boundaries for soft robotics applications. Do you think can you extend this approach to other kirigami patterns with higher stiffness or composite kirigami structures (e.g. kirigami embedded in a soft layer)?

 

VdW foundation

Wed, 2021-03-24 06:15

In reply to Nanosleeves: Morphology transitions of infilled carbon nanotubes

Hi Fan,

Beautiful work! Thanks for sharing. Just a quick question that I was curious about but didn't think of carefully yet: Does the substrate curvature play a role in modifying the vdW-type Winkler foundation in your work? The length scale should be important in the sense that the sheet cannot effectively 'feel' the curvature if its radius is too large. But don't know how this length scale explicitly appears in the foundation model and how it is compared to those in the system you studied. 

Zhaohe

a new idea on viscoelasticity model

Tue, 2021-03-23 20:27

In reply to QLV (Quasi Linear Viscoelasticity) vs Linear Viscoelasticity

Please find details in the following paper

A viscoelasticity model for polymers: Time, temperature, and hydrostatic pressure dependent Young's modulus and Poisson's ratio across transition temperatures and pressures

Compressibility

Tue, 2021-03-23 20:22

In reply to Why Rubber is incompressible?

Compressiblity of rubber is discussed in this paper

A viscoelasticity model for polymers: Time, temperature, and hydrostatic pressure dependent Young's modulus and Poisson's ratio across transition temperatures and pressures

https://www.sciencedirect.com/science/article/pii/S0167663621000922

A viscoelasticity idea

Tue, 2021-03-23 20:14

In reply to viscoelasticity

trying to add some new idea to viscoelasticity modeling. 

A viscoelasticity model for polymers: Time, temperature, and hydrostatic pressure dependent Young's modulus and Poisson's ratio across transition temperatures and pressures

Link: https://www.sciencedirect.com/science/article/pii/S0167663621000922#bib38

Other kirigami design and beyond

Tue, 2021-03-23 16:07

In reply to Journal Club for March 2021: Kirigami metamaterials as a robotic matter

Dear Ahmad,

Many thanks for the excellent and inspiring introduction and summary of kirigami matter. 

I would like to add one more point on shape morphing feature of kirigami approach. Shape plays an important role in determining its properties and functionalities. Introducing prescribed cut patterns leads to different 3D structures on different scales, e.g., the work by Dr. Zhang and Dr. Rogers’s groups, Zhang et al., A mechanically driven form of Kirigami as a route to 3D mesostructures in micro/nanomembranes. Proceedings of the National Academy of Sciences 112, 11757- 11764 (2015).

Non-periodic cut patterns could generate non-developable curved surfaces through buckling, e.g., the work by Dr. Daraio’s group, P. Celli et al., Shape-morphing architected sheets with non-periodic cut patterns. Soft Matter, 14, 9744-9749 (2018)

Very recently, my group posted a manuscript on arXiv on utilizing the control of cut boundary’s curvature to program the deployed 3D curved shapes through both forward and inverse design (Hong, et al., Boundary cuvature guided shape-programming kirigami sheets, arXiv preprint, arXiv:2103.11076 (2021) https://arxiv.org/abs/2103.11076)

Moving forward, can we extend the kirigami approach beyond 2D sheets to other forms or a generic inverse design of cuts for target mechanical properties and shapes?

 

Job application link

Fri, 2021-03-12 13:39

In reply to Postdoc position in the filed of biofilm mechanics at Syracuse University

Dear All,

The position has been officially posted online. You can submit your application through the following link:

https://www.sujobopps.com/postings/86230

Best,

Teng

congratulations for another book

Thu, 2021-03-11 12:48

In reply to Intermediate Solid Mechanics

Vlado, sincere congratulations for another book on mechanics! 

Shengqiang

Pages

Recent comments

More comments

Syndicate

Subscribe to Syndicate