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Wenbin Yu's blog

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How to use cdmHUB as a Cloud Collaboratory for Composites Design and Manufacturing

I will give a workshop on How to use cdmHUB as a Cloud Collaboratory for Composites Design and Manufacturing on The Conference on Advancing Analysis & Simulation in Engineering, June 5-7, Cleveland, Ohio. Details can be found at 

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Some ideas for a possible new journal

Inspired by the discussion with Mike Ciavarella on, I am thinking about a journal with the following attributes:

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Time to Register for 2017 American Society for Composites Annual Conference at Purdue

Dear Colleagues, if you are interested in the state-of-the-art R&D in composite materials, you might want to attend the American Society for Composites Anuual Meeting at Purdue (10/22-25, 2017). The registeration is open at

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Purdue Composites Manufacturing & Simulation Center is Hiring

Purdue Composites Manufacturing & Simulation Center is looking for outstanding candidates to fill multiple faculty positions at the level of Full, Associate and Assitant Professor in composites manufacturing & simulation. Please check for mroe details. 

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Turn your computer codes into Apps connected to HPC in the Cloud

Dear Imechanicians, I hope this turns out to be useful for some of you who are interested in sharing their computer codes. We are working on a free platform,, to allow users to quickly turn your scripts into Apps connected with HPC power in the cloud. Currently, the system can easily handle Linux or Windows executables. We are developing new functionalities so that other typical scripts such as Abaqus UMATs, Python scripts, matlab scripts can also be disseminated as launchable Apps in cloud.

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ASC 2017 Abstract due Feb. 17

Dear Fellow mechanicians, if your work is related with composites, you might want to consider presending your work on the American Society for Composites Annual Conference to be held on Purdue campus. The abstract is due this Friday (Feb. 17).

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Travel Scholarship and Code Competition for ASC 2017

To motivate students to attend the conference, ASC 2017 offers up to 20 travel scholarships including free registration and travel expenses up to $500. The top six will also receive additional cash prizes. Details can be found at Professors, please encourage your students to apply. The abstract due date is Feb. 17.  More details about the conference can be found at

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American Society for Composites Annual Conference Open for Submission

We are delighted to invite you to attend the American Society for Composites Annual Technical Conference which will be held on the campus of Purdue University, Oct. 23-25, 2017. The conference website is:

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International Conference on Composites Materials (ICCM-21), Xi'an, China, August 20-25, 2017

The 21st International Conference on Composites Materials (ICCM-21) will be held in Xi'an, China, August 20-25, 2017. ICCM, the most premier conference in the field of composite materials, aims at encouraging the exchange of the researches and insights from scientists and scholars, and promoting research, development and use of composite material and structures. You are welcome to  submit to Track 2.2 Multiscale Modeling of Structures to share your great ideas on multiscale modeling.

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Textile Composite Property Calculator in the Cloud

I hope this information will be helpful for some researchers. We recently integrated TexGen with SwiftComp, called TexGen4SC, to provide a very easy app to compute thermoelastic properties for textile composites for all the types of woven microstructures which can be generated by TexGen. This tool can achieve RVE analysis accuracy with a very small fraction of its computing time. This tool can respect the finite thickness of a woven fabric. It can be freely launched on any device (smart phones, ipads, etc) connected to Internet.

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A Better Alternative to RVE Analysis

RVE analysis is popular for computational homogenization. It can be used independently for virtual testing or as a module for multiscale modeling. Its popularity is mainly due to the maturity and acceptance of commercial finite element software. RVE analysis usually requires a 3D domain to obtain 3D properties and local fields. If a 2D RVE is used, only 2D properties and local fields are obtained. To obtain the complete set of properties, multiple analysis is needed. For example, to obtain the complete stiffness matrix, six 3D RVE analyses are needed.

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2017 ASC Annual Technical Conference at Purdue

Purdue will host the 32nd American Society for Composites (ASC) Annual Technical Conference. This conference convene composites researchers from around the world to interact with industry, government and academia, fostering collaborations among all stake holders in the composites community. More detailed information can be found at the conference website at

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2016 cdmHUB Annual Workshop at Purdue

Join us for the 2016 Composites Simulation Workshop at Purdue University. Learn about and engage with world-class researchers and industry experts in multi-scale composites modeling. Interact with state-of-the-art composites simulation software; hear expert, cutting-edge advances in strength and lifecycle prediction modeling. Experience composites 3D printing and advances in composites manufacturing modeling for high-rate automotive applications.

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cdmHUb Hands-on Workshop for Composites Learning, Teaching and Research in the Cloud

Join us at the American Society for Composites 31st Technical Conference (Williamsburg, VA) for a hands-on workshop, on September 18, from 7:00–9:00pm, on how to use for composites learning, teaching, and research in the cloud. This workshop features an overview of the cdmHUB cyberinfrastructure, and how to use cdmHUB for learning, teaching, and research.

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RVE analysis without BCs and periodic mesh requirements

RVE analysis becomes a routine exercise in material modeling. Usually it is carried out using finite element codes such as ABAQUS or ANSYS. The main thing one should pay attention is to applying the right boundary conditions. It is settled that periodic boundary conditions are the preferred boundary conditions to be applied. The BCs are that u_i-\epsilon_{ij}x_j should be equal on the corresponding edges. This type of boundary conditions can be applied using coupled equations constraints. This requires that one creates a mesh with corresponding nodes on periodic edges.

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Dear Imechanicians,

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Micromechanics Simulation Challenge

cdmHUB has completed the level I micromechanics simulation challenge. Several micromechanics methods/tools including both commercially available tools such as  Altair MDS, ESI VPS, Digimat, SwiftComp and research codes such as MAC/GMC/HFGMC and FVDAM, are used to analyze six typical 2D/3D microstructures.

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ICME Prize

The AIAA Materials Technical Committee (TC) with the support of Composite Design and Manufacturing HUB (cdmHUB), NASA (National Aeronautics and Space Administration) and Rolls-Royce Corporation funding have established an ICME prize for the best aerospace-focused ICME project.

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Journal Club Theme of October 2015: Mechanics of Structure Genome

The aim of this post is to introduce the mechanics of structure genome (MSG) as a possible unified approach for constitutive modeling of structures and materials. Because this discussion relates with structural mechanics and micromechanics, two familiar topics which have been studied by many, it is difficult to cite all the relevant references in a blog post without missing important ones. Thus, I only share some general understanding of relevant topics which are available from typical textbooks.

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Composites Simulation Workshop

Join the Composites Design and Manufacturing HUB for the 2015 Composites Simulation Workshop at Purdue University. Experience the first Composites Simulation Fair with commercial software providers in an open exhibit format. Overview the fundamentals of composites simulation; experience state-of-the-art composites simulation software; hear expert, cutting-edge advances in strength, fatigue and virtual allowables modeling from academic, industry and commercial software experts.

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Micromechanics Simulation Challenge Level I Initial Results Available

The initial results of level I of micromechanics simulation challenge have been compiled into a report, which is available at  Results for various composites including iber reinforced composites, particle reinforced composites, laminates, woven composites, short fiber composites from several readily available micromechanics simulation tools include MAC/GMC, MAC/HFGMC, FVDAM, MDS, DIGIMAT, SwiftComp are compiled.

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IACMI Indiana Starts Hiring

Purdue University is developing the composite virtual factory HUB (cvfHUB), a cutting-edge Cyber infrastructure platform for delivering integrated and validated commercial software tools to the Institute for Advanced Composites Manufacturing Innovation (IACMI), the fifth NNMI. This platform provides predictive capabilities through simulation and modeling to transform composites manufacturing.

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Share/run engineering simulation codes in the cloud

I know the mechanics community have many codes to share. If you have developed engineering software including legacy Windows codes or linux codes, you can easily publish your code in the cloud and have it run on any devices including smart phones through The codes could be simple codes you wrote for your dissertation or comprehensive commerical package like ABAQUS or ANSYS. You don't have to change your code, no source codes are needed. All you need to do is to upload your executable through a very straight forward way which only takes a few minutes.

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Micromechanics Simulation Challenge - Level 1

For the purpose of establishing the best practice for homogenization and dehomogenization needed in composites design and manufacturing, cdmHUB launches the Micromechanics Simulation Challenge. After incoporating comments from  academia, industry and commercial software providers, we have finalized the final draft for Level 1 problems, which is attached here with more details can be at


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