May 24, 2017
Welcome to
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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Structural Analysis

FEM Damage and Failure Analysis for the Structural Engineer

GENOA augments the limits of FEA by including value added capabilities to the solver of your choice without replacing your preferred FEA. GENOA's popular Progressive Failure Analysis (PFA) module works with leading industry solvers such as:
  • MHOST (Native Solver: Nodal based, integration through-the-thickness)
GENOA offers an integrated package of modules that extend these FEM analysis capabilities further. Some of these modules that utilize PFA and FEM analysis are:
  • Progressive Failure Analysis Complete Package
  • PFA Fatigue
  • A & B Basis Allowables
  • Material Characterization Optimization
  • Parametric Robust Design
  • Parametric Carpet Plots

Progressive Failure Analysis (PFA) Complete Package

PFA predicts the maximum loads that composite and metallic elements and structures can sustain using a step-by-step virtual loading procedure that takes into consideration material degradation, nonlinearity and changes in structural geometry. Degradation of material properties is based on 1) matrix plasticity and micro-cracking; 2) fiber orientation changes and breakage; and 3) environmental effects and manufacturing defects.

While predicting crack initiation and growth, the module computes various damage locations and failure modes in composites caused by the application of external static loads, temperatures and environmental effects.

It may also predict damage events at different material scales beginning with the micro-cracking in fiber, matrix and fiber/matrix interface. Damage propagation is tracked from the micro-level to ply, laminate and structural levels.

Some additional PFA options are:
  • Low Velocity Impact
  • Virtual Crack Closure Technique
  • Discrete Cohesive Zone Model
  • Complex Unit Cell with Interface Modeling
  • Honeycomb Sandwich Structure
  • Progressive Failure Dynamic Analysis
PFA is the ideal solution for virtual testing and to reduce physical experimental testing by closely simulating the actual testing process.

Click here to read more from the datasheet.

A- & B-Basis Allowables with FEA

GENOA A- and B-Basis allowables module predicts strength allowables for polymer matrix composites obtained from standard ASTM tests.
Option 1 - User Supplied Test Data: This approach combines test data with statistical methods, as specified in MIL HDBK 17E (Military Handbook for Polymer Matrix Composites) and FAA CFR 14. With user test data, the allowables are calculated using the referenced standard procedures. Additionally, the data is fitted and plotted.
Option 2 - Limited Test Data: This approach combines progressive failure analysis with probabilistic methods and composite mechanics to determine allowables.
  • The A-and-B Basis values are determined at the 1% and 10% probabilities and are first calculated from the limited test data.
  • Coefficients of variation and distribution are then assigned to manufacturing and material property random variables (works with fiber/resin or lamina properties). GENOA PFA Unit Cell is then used to determine the ASTM material failure stresses.
  • GENOA generated strength cumulative distribution (CDF) and probability density (PDF) functions are compared to CDF's and PDF's from user's test database.
  • Matching the scatter between test and simulation provides an effective tool to reduce the number of actual coupon tests.
Click here to read more from the datasheet.

Material Characterization Optimization (MCO)

MCO is an integrated material characterization/optimization module that adjusts generic fiber/matrix properties of a selected composite system so that the results of ASTM coupon tests (stress-strain fields) are closely reproduced.

It is a virtual testing simulation system - desired structural and material performance can be determined by numerical simulation with minimum experimental support.

It may predict a unified material database of fiber and matrix constituent properties for a given material system so that single/multiple experimental tests are numerically replicated.

It also uses an efficient multi-factor interaction model (MFIM) to predict non-linear matrix behavior. MFIM accounts for a broad range of factors that affect material performance such as high stresses, time dependence, fatigue and temperature.

Click here to read more from the datasheet.

Parametric Robust Design

Enables comparison plots for 5 considered best designs. This includes load/displacement curves, damage volume/energy, strain energy, Derr, weight, volume. Sorts all generated designs according to specific criteria: damage initiation/propagation, fracture initiation/propagation, ultimate loading, weight, volume. Generates sets of designs based on parametric capabilities of commercial FE software by varying user-defined parameters:
  • Geometry: dimension, thickness
  • Mesh: mesh-seed, element size
  • Loads & Boundary conditions: force/displacement intensity
  • Material uncertainties: mechanical properties
  • Manufacturing defects: ply orientation, ply thickness, void volume ratio, fiber volume ratio.

Other benefits include improving design durability and reliability, compare best geometries and eventually assess an improved design based on user-defined criteria

Parametric Carpet Plots

Generate carpet plots of laminate properties as a function of percent 0, +/-45 and 90 plies where mechanical properties generated include stiffness, strength and Poisson's ratio. Laminate thermal properties such as coefficient of thermal expansion, conductivity, and specific heat can be generated as well.

Carpet plots identify laminate percentages (regions) that are governed by fiber failure dominance, by matrix cracking (transverse and shear) dominance and by combined fiber/matrix failure. These apply to coupon/component levels as well.

The applications and benefits include reducing the number of laminate coupon tests required to verify the entire range of 0, +/-45 and 90 percentages:

  • Verify select laminate layup predicted strength/stiffness response with physical testing.
  • Then rely on GENOA to generate strength/stiffness responses are all remaining laminate layups.

Other benefits include providing a guideline when test data is not available and identifies laminate layups that are governed by specific local criteria (fiber controlled vs. matrix controlled)

Click here to read more from the datasheet.

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