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Daniel_Melo's Postings

Answers provided by John Linck on Challenges and Opportunities

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Q.: Can we add "the cutting challenge of Carbon Fiber Laminate"? For example, it is hard to use laser cutting.

YouTube Video - Trace-Based Composites Design

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Introduction to trace-based stiffness and strength of laminated composites by Prof. Steve Tsai and Prof. Daniel Melo at Stanford University.
https://www.youtube.com/watch?v=5YadjrRx4YM

Answers provided by Antonio Miravete on Materials and Manufacturing

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- Are we more restricted in the choice of angle with the dry ply, from a manufacturing point of view and cost? For instance with dry ply can we easily ask for a [22/30/45] laminate?

Answers provided by Steve Nolet on wind turbine blade design

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Questions and answers:

1) How do you bond the two halves together including the material and curing?

Homework deadline postponed

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In response to requests received from some participants, we have postponed the deadline for submission of the homework to Wednesday, Aug 22nd, 2012, before starting the workshop session.

New MicMac-Hole file available

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New MicMac-Hole_v222 available for download. Please check "Download Utility - Workshop VII".

MicMac-FEA for Abaqus 6.11 available

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MicMac-FEA for Abaqus 6.11 is available for download at the download utility.

Homework HW#4 postponed

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Submission date for HW#4 was postponed to January 26 since we have not received the new version of MicMac-FEA.

Reference on biaxial tests (experimental and simulation)

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Effects of an Open Hole on the Biaxial Strengths of Composite Laminates.
Yuanchen Huang, Sung K. Ha, Jun Koyanagi, Jose Daniel D. Melo, Hisashi Kumazawa and Ippei Susuki.

Electrical conductivity of carbon fibers

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In response to the question raised in the presentation about Materials and Processing, Prof. Miravete informed that the electrical conductivity of carbon fibers ranges from 500 - 20,000 (ohm-cm)-1.

References provided by Antonio Miravete

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These are the most relevant references for the presentation on fibers, matrices and manufacturing:

• S. W. Tsai, Strength & Life of Composites, Stanford University, 2009

Questions forwarded to Steve Nolet regarding wind turbine blades and the answers provided.

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1. Is a special process used to remove the reusable vacuum bags from the cured part to ensure the bags are not damaged, or are they sufficiently robust to allow them to be removed by hand?

MicMac-Hole for Office 2003

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We have uploaded MicMac-Hole for Office 2003. The file name is MicMac-Hole_2003_v205.xls

Problem downloading MicMac-Hole

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If your computer downloads MicMac-Hole as a zip file, please rename the zip file and add the extension .xlsm. You will need Excel 2007 with macros enabled to open the file.

Homework

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Please send your homework to cdw.homework@gmail.com on Mondays, before 8:00 am (PT).

Homework deadline postponed

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In response to requests received from some participants, we have postponed the deadline for submission of the second homework to Tuesday, Aug 3rd, before 8 AM (PDT).

Homework

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A file with the homework assigned to be submitted Monday, Aug 2nd, is available in the folder "Homework".

Full-Field Optical Measurement Systems

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A compressed (Zipped) folder is available for downloading the files related to the presentation on Full-Field Optical Measurement Systems.

Effects of fiber arrangement on properties of UD composites

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For those interested in the effects of fiber arrangement on properties of UD composites, we recommend reading the following papers:

New versions of MMFatigue and SMM+

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We have uploaded new versions of MMFatigue_v1.0 and SMM+v150_P_CDT7. These versions will fix the installation problems.

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