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Welcome
What's New
View new features for Altair HyperWorks 2025.
Get Started
Learn the basics and discover the workspace.
Tutorials
Learn more about the Altair HyperWorks suite of products with interactive tutorials.
Startup Procedures and Customizations
Start and configure the applications.
Tool Finder
View a list of deprecated panels and their newer, equivalent workflows.
Manage Files and Data
Create, open, import, and save models.
Sessions and Report Templates
Set up sessions and create report templates.
Interface with External Products
Solver interfaces supported in HyperMesh.
Entities and Solver Interfaces
A solver interface is made up of a template and a FE-input reader.
Browsers
Browsers provide a structured view of model data, which you can use to review, modify, create, and manage the contents of a model. In addition to visualization, browsers offer features like search, filtering, and sorting, which enhance your ability to navigate and interact with the model data.
Sketching
Create and edit 2D parametric sketch geometry.
Topology
Create, edit, and cleanup geometry.
FE Geometry
FE geometry is topology on top of mesh, meaning CAD and mesh exist as a single entity. The purpose of FE geometry is to add vertices, edges, surfaces, and solids on FE models which have no CAD geometry.
Meshing and Elements
Explore the different types of mesh you can create in HyperMesh and create and edit 0D, 1D, 2D, and 3D elements.
Model Build and Assembly
Create, organize and manage parts and subsystems.
Composites
HyperMesh composites modeling.
Connectors
Create connections between parts of your model.
Morph
Rapidly change the shape of the FE mesh without severely sacrificing the mesh quality.
Skeleton Modeling
Create a reduced ordered model to facilitate optimization at the concept phase.
Design Space
Workflow to support topology optimization model build and setup.
Optimization
Setup an Optimization in HyperMesh.
Design Explorer
Multi-disciplinary design exploration and optimization tools.
Validate
Validate the model built before running solver analysis.
Analyze
Models require loads and boundary conditions in order to represent the various physics and/or physical equivalents to bench and in-use testing.
Axisymmetry
Reduce a full 3D model with axisymmetric surfaces while accounting for imperfections.
Concept Modeling
Tools and workflows that are dedicated to rapidly creating new parts for specific use cases, or amending existing parts. The current capabilities are focused on stiffening parts.
Crash and Safety
Tools used for crash and safety analysis.
Airbag
Use airbag folder utilities and export a resulting airbag in a Radioss deck.
Aerospace
Essential utility tools developed using HyperMesh-Tcl.
Aeroelasticity
Import an aeroelastic finite element model with Nastran Bulk Data format.
Certification
Framework to plug certification methods to assess margin of safety from the model and result information.
PhysicsAI
Use PhysicsAI to build fast predictive models from CAE data. PhysicsAI can be trained on data with any physics or remeshing and without design variables.
Results Data
Results data can be post-processed using both HyperMesh and HyperView.
- Results Data in HyperMesh
  Direct integration of native results readers into HyperMesh allows you to perform results visualization on the model.
- Results Data in HyperView
  HyperView is a complete environment to visualize, query, and process results data.
  - Working with Models
    Open animation files, measure various distances and angles between entities, and use the Results Browser to view the model structure and find, display, and edit entities.
  - Animate and Visualize Results
    Create section cuts and explore the various result plotting tools.
  - Create Entities
    Create and edit user-defined data type expressions, derived load cases, and systems. You can also plot a forming limit diagram, generate streamlines, track entities during animation, and create and import/export sets of entities.
    - Create Derived Results
      The Expression Builder is a graphical user interface which allows user-defined data type expressions to be authored directly within HyperView.
      - Output Parameters
        The output parameters section of the Expression Builder allows you to define the data type label and output for the newly created result.
      - Operators
        The list of available operators is controlled by the template file selected when loading a model and result, and it can be modified by adding or removing <using /> statements in the template.
      - Table Selection
        Once an operator is selected, tables must be selected to form the input.
      - Default Arguments
      - Constant Value Arguments
        When an argument is passed as a constant, it is converted to a constant value table by the Expression Builder.
      - Additional Resources
        Additional resources can be attached to the analysis for the purpose of adding new tables.
      - Authoring Expressions
        The Expression Builder uses a Templex-like syntax to author Result Math XML commands.
      - Result Math
        A result manipulation library that enables user-defined data types to be added to a result, and transitions complex data manipulation tasks from HyperView to a reusable, modifiable set of libraries that focus solely on result processing tasks.
        Results Browser
        Result Math Templates
        Various Result Math templates are available whenever a model/result pair is loaded into HyperView.
        Creating New Datatypes
        Operator Library Reference
        Result Math operators are contained within a set of related functions organized by category or industry vertical known as libraries.
        Math Library
        The Math library contains operators which are used for performing basic math functions to manipulate value tables.
        Composites Library
        The Composites library contains operators that calculate multiple composite failure theories.
        Hashin Criterion
        Hill Criterion
        Hoffman Criterion
        Maximum Strain and Maximum Stress Criteria
        Puck Criteria (2D)
        Tsai-Wu Criterion
        Yamada-Sun Criterion
        Example Definition
        NVH Library
        The NVH library contains operators which are used for frequency domain and acoustics functions.
        Model Library
        The Model library contains functions that deal with model data and how values can be manipulated or transformed through model entity relationships.
        Plug-in Library
        The Plug-in library provides support for applying a compiled or interpreted script operation on a value table.
        Spatial Library (Beta)
        The Spatial (Beta) library contains functions that deal with minimum distance and result mapping.
        Command Arguments and XML Processing
        Operators accept string and table input/output arguments.
        Constant Value Tables
        Constant value tables are created from the Constant operator in the Math library.
        Error Handling
        Known Limitations
        Result Math Reference Guide
    - Derived Load Cases
      The Loadcase tool allows you to create a derived load case from other load cases, or from a combination of other load cases and simulation steps.
    - Systems
      Create your own user defined coordinate systems or select result coordinate systems.
    - FLD
      Use the FLD tool a plot a Forming Limit Diagram (FLD) based on a material Forming Limit Curve (FLC) and the major and minor strain output results of a forming simulation.
    - CFD Post-Processing
      HyperView offers CFD post-processing capabilities for a large class of industrial applications.
    - Tracking
      Use the Tracking tool to track any entity during animation.
    - Sets
      Use the Sets tool to create, import, and export sets/groups of components (parts), elements, and nodes.
  - Query Data
    Query entities, create or edit free body diagrams, construct multiple curves and plots from a single result file, and create and plot stress linearization.
  - Annotate Models
    Annotate animation files using notes or trace various entities during animation.
  - Transform Models
    Define planes of symmetry/axisymmetry or explode a model.
  - Overlay Images/Videos
    Select and overlay images or videos in the modeling window for correlation and presentation purposes.
  - Rendering Models
    Select a graphics rendering mode and change the appearance of materials.
  - Additional Tools for Post-Processing
    The Tools menu provides you access to various panels and dialogs.
  - Profiles
    Load preference file profiles to access the various Aerospace tools, NVH utilities, and Vehicle Safety Tools.
  - Preferences Dialog
    From the Preferences dialog, you can access various HyperView display options.
  - Display/Visualization Options
    Explore the various display and visualization tools.
  - HyperView - MultiCore
    A new workflow emphasizing the multicore profile for post processing results from certain solvers and crash use cases.
Developer
The Developer ribbon contains tools for automation and customization.
Plot Data
HyperGraph is a data analysis and plotting tool with interfaces to many file formats.
Multibody Modeling
MotionView is a general pre-processor for Multibody Dynamics.
Media Files
MediaView plays video files, displays static images, tracks objects, and measures distances.
Tabulate Results
Use TableView to create an Excel-like spreadsheet.
Text Files
TextView math scripts reference vector data from HyperGraph windows to automate data processing and data summary.
Publishing and Reporting
Create, define, and export reports.

View All Altair HyperWorks Help

Maximum Strain and Maximum Stress Criteria

These criteria do not consider any interaction between different stress (strain components).

The failure occurs if one of the following conditions are satisfied:

$σ_{1} \geq X_{T}$ or $σ_{1} \leq - X_{C}$
$σ_{2} \geq Y_{T}$ or $σ_{2} \leq - Y_{C}$
$τ_{12} \geq S$

Being

$σ_{1} σ_{2}$ and

$τ_{12}$ the in-plane normal stress components and the in-plane shear stress one respectively and where:

$X t, X c$ are the maximum allowable stresses in the 1-direction in tension and compression,
$Y t, Y c$ are the maximum allowable stresses in the 2-direction in tension and compression,
$S$ is the allowable in-plane shear stress

Relevant failure index is evaluated as per the following equation:

$F_{i n d e x} = \max [\frac{σ_{1}}{X}, \frac{σ_{2}}{Y}, \frac{τ_{12}}{S}]$

being $X = X_{T}$ or $X = X_{C}$ if $σ_{1} \geq 0$ or $σ_{1} < 0$ and the same for $Y$ .

The approach for maximum strain criterion is the same as per the maximum stress on, but with the corresponding strains in the condition for failure to be taken into account.

Syntax

MaxStrainFT(tensor,xt,xc,yt,yc,s,sets,plies,elems,parts,props,pool_name,layer_index,opt_str)

Arguments

tensor: Stress table
xt: Allowable tensile stress/strain in ply material direction 1
xc: Allowable compressive stress/strain in ply material direction 1
yt: Allowable tensile stress/strain in ply material direction 2
yc: Allowable compressive stress/strain in ply material direction 2
s: Allowable in-plane shear stress/strain
sets: Set table (D=NULL)
plies: Ply table (D=NULL)
elems: Element table (D)
parts: Part table (D)
props: Property table (D)
pool_name: Pool name (D=@current_pool)
layer_index: Layer index (D=@current_slice_index)
opt_str: This is an optional argument, which can passed if needed (D=option).