Wednesday, July 25, 2007

Collaborative Virtual Testing (CVT) Remote Client Analysis


Software Suite for Durability, Damage Tolerance, and Life Prediction
Augments Solutions for NASTRAN, LS-DYNA, ABAQUS & ANSYS

This Week's Feature Highlight

Collaborative Virtual Testing (CVT) Remote Client Analysis

Multiple users can login to a central server from remote workstations
As part of the GENOA family, CVT 2.0 is an add-on package that allows users to use GENOA through the internet using a remote-client framework. CVT allows GENOA to be installed on a central server where multiple users may simultaneously login and perform analysis jobs. The clients do not need to install GENOA on their remote workstation and only require a common internet web browser (Internet Explorer, Netscape, etc.) to access GENOA. This may be helpful for environments where multiple GENOA licenses may be difficult to install or for remote users wishing to access GENOA from remote geographical regions. CVT may be customized for an internal private corporate intranet or to the outside public internet.
The clients may access the CVT analysis server using standard HTML web pages and Java 3D applets through their internet web browser.
CVT 2.0 Features:  
  • Allows GENOA users/engineers to remote access a central server through an internet browser.
  • Ideal for customers to use GENOA within their own intranet and for remote purposes.
  • Utilizes web server to monitor user logins and launch GENOA GUI as Java applet
    through client browser.
  • Creates user accounts, monitors analysis jobs, and records logs of user logins and
    analysis runs.
  • Upload/Download files and models through web server interface.
  • Supports internet browser from any platform (Mac, UNIX, Windows, Linux, etc.) that
    supports Java & Java3D plug-in.
  • Includes Documentation and Step-by-Step Tutorial Example.
  • Cross-platform capability such as Windows client accessing Linux server, Linux
    client accessing Windows server, etc.

Did You Know?

GENOA Download Demo and Web Demo

imageDid you know that it is easy to evaluate and try GENOA?  Simply go to the Download section of www.ascgenoa.com and select either Demo Download or Web Demo.  The Web Demo is the fastest way to test and requires only a Java plug-in with your internet browser.  Find out more here! 
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Monday, July 9, 2007

Fatigue Prediction & Verification of 3D Woven Composite


Software Suite for Durability, Damage Tolerance, and Life Prediction
Augments Solutions for NASTRAN, LS-DYNA, ABAQUS & ANSYS

This Week's Feature Composite Example

Fatigue Prediction & Verification of 3D Woven Composite

Figure 1 - 3D Weave Architecture
3TEX 3Weave (3D woven fiberglass mat)/vinyl-ester (Dion 9800) composites (Figure 1) have been investigated as a candidate material in the DOE-Delphi-NCC (National Composite Center) Composite Chassis Cross-Member program. One of the most important mechanical properties for qualifying these composites for such applications is the mechanical fatigue longevity. The math-based GENOA methodology effectively tracks the details of damage initiation, growth, and subsequent propagation to fracture, for composite structures subjected to cyclic fatigue, thereby predicting the fatigue life.
The utility of the GENOA technology was demonstrated by predicting premature and extended fatigue lives in tensile mode of various 3TEX 3Weave/Dion composites (Figure 2). The simulated fatigue longevity of 3D woven ISO coupons agrees well with those measured in actual tensile-tensile fatigue tests using the R (minimum-to-maximum stress ratio) value of 0.1 (Table 1). Furthermore, GENOA PFA simulations quantitatively predicted the effect of the void content on premature fatigue failures.
Table 1 - Comparison between fatigue life cycles for composites with high and low void contents
Indeed a 10% volume fraction of void defects reduces the fatigue life of the 3D woven composite by a factor of 40 at the tensile load of 30% composite ultimate strength (Table 1). Finally, the sensitivities of composite fatigue life to manufacturing anomalies were calculated using GENOA Probabilistic PFA for future design of the composite structure (Figure 3). This math-based predictive methodology is currently being used in the DOE-NCC Composite Chassis Cross-Member program.
Figure 2 - Failure mechanisms for the tensile-tensile fatigue of the composite tensile test coupon
Figure 3 - Sensitivities of composite fatigue life to its constituent parameters

Did You Know?

Five Reasons to Use GENOA for Aerospace Applications

image
  • Accurate prediction of loads that produce damage and fracture initiation and propagation in composite/sandwich/metallic structures.
  • Assessment of damage initiation and growth under static, impact (low and high velocity), thermo-mechanical fatigue (quasi-static, harmonic, and random), and creep loading.
  • Prediction of failure modes (including delamination, fiber micro-buckling, fiber crushing, etc.) in composite structures.
  • Simplified representation of all types of composites including tape, 2D-3D weave and braids and stitched (polymers and ceramics).
  • Ability to select from a range of competing designs that would improve the product performance and delivery time to market through virtual testing and accelerated certification processes.
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