June 24, 2017
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The Leading Software Solution for Material and Structural Failure Analysis
Quick News & Press Release
GENOA 4.4 Released
NANO Capability Introduced
New PFA Unit Cell
New MCO Unit Cell
Issue #22 - 7/16/2013
Structural Health Monitoring Test Validation
Issue #21 - 1/16/2013
Managing Defects & End of Life Prediction / Validation in Composite Wind Turbine Blades
Issue #20 - 4/13/2010
Material Characterization & Qualification (MCQ)
Issue #19 - 11/17/2009
Composite Structures & Parametric Robust Design (PRD)
Issue #18 - 7/13/2009
Numerical Approach to Determine Crack Path and Delamination Growth in Composite Structures
Issue #17 - 5/4/2009
Certification-by-Analysis (CBA)
Issue #16 - 10/20/2008
Material Qualification and Certification Determine Allowables by Means of Virtual Simulation Combined With Limited Testing
Issue #15 - 6/10/2008
Predicting Post-Buckling Response and Ultimate Failure of Composite 2-Stringer Panels
Issue #14 - 4/28/2008
Composite Storage Module Joint Analysis and Test Verification
Issue #13 - 2/25/2008
GENOA 4.3 Release with A- and B-Basis Allowables
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Advanced Composite Technology (ACT) Three Stringer Panel

The model shown is a three-stringer stiffened panel subject to uniaxial tension. It measures 40 inches long by 24 inches wide. The distance between stringers is 8 inches while the stringer height is 1.8 inches. The discrete source damage (DSD) was simulated by a slit in the panel center. Slit length was 7 inches. The finite element model had 1208 thick shell elements and 1518 nodes. An adaptive mesh scheme was employed to catch the stress concentration at crack fronts during crack growth. The analysis demonstrated GENOA's ability to model and determine structural residual strengths. Such an analysis process can reduce the cost and time required to certify the damage tolerance of primary wing structures against DSD events.

Static ACT Damages
Animation of the analysis with a display of the force loading at the edge and the node damages occurring with their respective damage criteria types displayed in percentages.
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Static ACT Ply Damages
Animation of the ply schedule areas assigned throughout the model with damages involved in the first ply schedule area. Four plies are selected and shown simultaneously through the use of mesh layers stacked in the Z direction.
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Static ACT Photo-Elasticity
Animation of the analysis using a photoelastic camera view of the strain distribution.
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T-Joint Model

T-joint with a Pi section reinforcement that was originally designed for X-37 mini space plane. GENOA simulation demonstrated how the joint failed around the juncture area.

T-Joint Ply Schedules
Demonstration of the ply schedule areas assigned to the model before analysis.
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T-Joint Force Loading
Demonstration of damage evolution due to an applied load at the bottom of the upright.
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T-Joint Damages
Animation of the analysis, showing the node damages occurring and their respective damage criteria types (displayed with percentages).
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T-Joint Ply Damages
Demonstration of the ply damages involved in the first ply schedule area. Eight plies are selected and shown simultaneously through the use of mesh layers stacked in the Z direction.
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T-Joint Ply Damages Part 2
A different view of the ply damages in a different stacking orientation with two ply schedule areas selected at the same time.
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Filament Winding (FW) Model

This model demonstrated the winding and PFA analysis of a 20" inch length tank with spherical end domes using a combination of helical and hoop tape windings. Fiber orientation and tank thickness can be accurately predicted with GENOA-FW. The radius was about 3.2 inch. The tank had an aluminum liner overwrapped by composite. GENOA-PFA predicted a burst pressure of 11,200 psi. This was only 4.5 percent off from observed test value of 10,700psi. The first node fracture was detected when the pressure reach 11,200 psi. After the fracture initialed, it propagated to adjacent nodes very rapidly with no pressure increase. Therefore, the tank burst pressure is 11,200 psi.

FW Ply Angles
Overview of the ply angle distribution used after the winding process is completed with layer-by-layer showing and color spectrum display.
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FW Displacements
Graphical display of the displacements occuring in X, Y, and Z directions with color shading showing magnitude.
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FW Damages
The playback of the analysis with the node damages occuring and their respective damage criteria types displayed with percentages.
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FW Ply Damages
Demonstration of the ply damages involved in the first 4 plies including the inner liner.
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FW Photo-Elasticity
The playback of the analysis with a Photo-Elastic camera view of the strain distribution.
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