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OptiStruct – Imperfection

Tips and Tricks #1403: OptiStruct – Imperfection Geometric imperfection can be applied to stability sensitive structures which have difficulties in being solved, because of local or global buckling.Imperfection helps to transform the bifurcation problem into a limit point problem.

Tips & Tricks

OptiStruct – PSEUDO Damage Calculation

Tips and Tricks #1404: OptiStruct – PSEUDO Damage Calculation PSEUDO damage calculation • Speedup the fatigue calculation dramatically. • Effective if the small damaged elements are not of concern. • SN/EN and Uni-axial/Multi-axial base metal fatigue with static subcase • Optimization supported.

Tips & Tricks

OptiStruct – Membranes in LGDISP & Plasticity

Tips and Tricks #1405: OptiStruct – Membranes in LGDISP & Plasticity Membranes are supported now for LGDISP NLSTAT analysis.For Nonlinear materials, plasticity is supported for membranes– both SMDISP and LGDISP.Both 1st order and 2nd order elements are supported for SMDISP and LGDISP NLSTAT.Stress on membranes should be comparable (not exact) to surface stresses on solids (which can be obtained with specifying ISOP option as INT0 in PSOLID, and output stress at GAUSS location).

Tips & Tricks

OptiStruct – New Beam Formulation

Tips and Tricks #1406: OptiStruct – New Beam Formulation New Beam Formulation (Timoshenko) • Timoshenko beam theory formulation is introduced with PARAM,BEAMALT,YES for CBAR/CBEAM.Default is NO. • With this formulation turned on, the shear deformation of the beam will be more accurate and rotary inertia will alsobe added. For the maximum accuracy, it is recommended to use PARAM,COUPMASS,YES.

Tips & Tricks

OptiStruct – CGAP Force Output Includes Preload

Tips and Tricks #1407: OptiStruct – CGAP Force Output Includes Preload CGAP Force Output Includes Preload • Preload force ‘F0’ is included in the CGAP element force output. • Preload force ‘F0’ is supported for Nonlinear static analysis (SMDISP/LGDISP), and ignored in linear analysis. • The output is available in *.h3d and/or *.op2. & with OPTI forces are written to a .force file. • With NLOUT request, incremental CGAP force output is available in *.h3d and .force file. • Currently ‘on the fly’ CGAP force output in *.impl.h3d file is not available.

Tips & Tricks

Altair OptiStruct – Viscoelastic Material

The behavior of Viscoelastic materials is intermediate between the idealized behavior of elastic solids and viscous liquids. The time domain Viscoelastic material in OptiStruct is represented by the generalized Maxwell model and is defined by a Prony series expansion.

Tips & Tricks

Altair OptiStruct – Creep Material

Creep is the permanent time dependent deformation occurring in structures, can be defined using MATVP bulk card entry. It is based on power-law model and can be used in its ‘time hardening’ form or in the corresponding ‘strain hardening’ form.

Tips & Tricks

Altair OptiStruct – Manufacturing Constraints Support for Multiple-Material Topology Optimization

All manufacturing constraints are supported for Multiple Materials Topology optimization (MMAT) from v2019.1.Different manufacturing constraints could be applied to different candidate materials in the same design domain. The original material defined by property will not be taken as candidate material by default. OptiStruct will error out if there is only one candidate material defined for the same design domain in MMAT.The element density result is available for all candidate materials in v2019.1.

Tips & Tricks

Multidisciplinary Workflow to Assess Modal Fatigue Results of a 4-Cylinder Crankshaft Using AVL EXCITE, OptiStruct and FEMFAT

The crankshaft of an engine is a highly dynamically loaded component that is continuously optimized and optimized in terms of design and production technology. In order to be able to reproduce this in the simulation, the essential influences must be considered. This includes the dynamically behaviour in combination with the engine, the material properties and the application of the loads and their transfer to other parts (bearings). The modal approach has established itself as a proven method here, whereby a modal basis is determined in the FEM so that the crankshaft is integrated as a flexible body in the MKS model of the engine, and so that an entire engine run-up can be simulated. The modal participation factors are obtained from the MBS simulation, which are used together with the modal stresses for the safety factor calculation. This workflow requires the combination of different simulation tools. The challenge is to organize the data transfer between the tools efficient and correct. In this example, the workflow is realized using OptiStruct from Altair for FEM calculation, EXCITE from AVL as MKS tool and FEMFAT from Magna Powertrain ECS as Fatigue solver. This makes it possible to simulate a complex engine run-up with consideration of the ignition bearing forces and to calculate the fatigue life of the crankshaft in FEMFAT. This webinar, details of the simulation workflow of the 4-cylinder crankshaft will be presented and the effects of several influencing variables on the fatigue life will be studied.

Webinars

Scaling Up Your Nonlinear Analysis Solver Throughput with HyperWorks Unlimited

In this webinar, you'll learn about OptiStruct's nonlinear analysis performance at scale as well as Altair's powerful and cost-efficient solutions for on-premise or virtual compute clusters.

Webinars

Fast Forward Your Nonlinear Analysis with OptiStruct

Simulate the effects of large displacements, material nonlinearity and advanced contacts with Altair OptiStruct™. OptiStruct is the industry standard for the optimization of topology, composites, mechanisms and additive manufactured parts, but over the past three decades, it has evolved into a comprehensive linear and nonlinear analysis solution, delivering the functionality that customers of traditional nonlinear implicit codes expect coupled with the high performance they need. Watch this webinar to learn about how OptiStruct is being used to reduce software cost, simulate faster, and improve design process efficiency.

Webinars

Battery & Motor Thermal Management for Electric Vehicles

The key element of an electric vehicle (EV) is the battery and batteries are known to produce heat during their charge-discharge cycle. An efficient thermal management system (TMS) is of paramount importance. The battery TMS affects the cost, life, and range of the EV. A battery TMS study or an EV TMS study involves the use of thermal and fluid physics and Altair’s AcuSolve (Computational Fluid Dynamics based Simulation Technology), was used to carry out this study. The importance of finding new methods for effectively and accurately designing TMS that control temperature and optimize the performance of Li-ion batteries. This can be used to study and optimize the Battery Thermal Management System and other Thermal Management requirements arising in an electric vehicle which involves both active and passive cooling. A similar issue of heat (unwanted) exists in Motors as well, in this, we shall cover the Multiphysics simulation of Motors which shall include both electromagnetics and CFD Thermal studies of both air and liquid coolant motors.

Webinars

Traction Motors Design & Multidisciplinary Optimization

Traction Motor play key role in the electric vehicle/hybrid electric vehicle (EV/HEV) development process. The design of a High-Performance e-Motor is a complex undertaking. Engineers have conflicting constraints to consider including efficiency, temperature, weight, size, and cost. To explore more ideas, better understand their designs and improve performance, Altair HyperWorks™ has a workflow to guide motor designers through an efficient process of Simulation-Driven Design. This analysis and optimization solution supports multi-disciplinary teamwork and reduces design times.

Webinars

eBook: Learn Dynamic Analysis with Altair OptiStruct

This study guide aims to provide a fundamental to advanced approach into the exciting and challenging world of Structural Analysis.

eBooks, Training Materials

eBook: Introduction to Nonlinear Finite Element Analysis using OptiStruct

This study guide aims to provide a fundamental to advanced approach into the exciting and challenging world of Nonlinear Analysis.

eBooks, Training Materials

eBook: Learn Thermal Analysis with Altair OptiStruct

Examples in the eBook – Learn Thermal Analysis with Altair OptiStruct

eBooks

eBook: Learning Fatigue Analysis with Altair OptiStruct

The focus of this study guide is on Fatigue Analysis. As with our other eBooks we have deliberately kept the theoretical aspects as short as possible.

eBooks

eBook: Practical Aspects of Structural Optimization

This study guide aims to provide a basic introduction in the different optimization methods. Designed for users who are interested to learn more about the “inspiring” world of optimization.

eBooks

OptiStruct – Nonlinear Axisymmetric Analysis

Nonlinear axisymmetric analysis with OptiStruct.

Tips & Tricks

OptiStruct – Mode Tracking and Rotor Energy from Complex Eigen Value Analysis

OptiStruct – Mode Tracking and Rotor Energy from Complex Eigen Value Analysis

Tips & Tricks

OptiStruct – Key Performance Indicator Output

OptiStruct – Key Performance Indicator Output

Tips & Tricks

OptiStruct – Section Force Output from Pretension Bolt

OptiStruct – Section Force Output from Pretension Bolt

Tips & Tricks

Altair OptiStruct New Feature Overview

View a high level overview of the new features available within OptiStruct 2019.

New Features

Altair OptiStruct New Axisymmetric Element (CQAXI)

OptiStruct offers support for the QUAD element type that defines a 4 or 8 node CQAXI Bulk entry.

New Features, Videos

Altair OptiStruct Grid Based Free Shape Optimization

A new option, GRID, is available on the 3rd field of DSHAPE Bulk Entry that allows more flexible shape changes (including normal to the shell surface) as each DSHAPE grid has its own design variable.

New Features, Videos

Altair OptiStruct Interface Enhancements in SimLab

New solutions approaches are supported to perform model setup for OptiStruct, including enhancements to the loads and constraints and optimization responses.

New Features, Videos

What's New in OptiStruct 2019

Find out what's new in Altair OptiStuct 2019, THE solver for linear and nonlinear analysis.

Webinars

Aircraft Radome Multiphysics Using Simulation

Watch this webinar to see a demonstration of a multiphysics simulation approach using the Altair HyperWorks platform for the analysis of airborne radomes for electromagnetic , structural, aerodynamic, and bird strike performances.

Webinars

Altair OptiStruct – Solver Online Help

New online help with OptiStruct.

Tips & Tricks

Altair OptiStruct – Enhanced FSTOSZ Functionality for Composites Optimization

Enhanced FSTOSZ functionality for composites optimization with OptiStruct.

Tips & Tricks

Altair OptiStruct – Output of Multiple Failure Theories for Composites

Output of multiple failure theories for composites in OptiStruct.

Tips & Tricks

Altair OptiStruct – Zone Based Discrete Composite Free-Size Optimization

Zone based discrete composite free-size optimization with OptiStruct.

Tips & Tricks

Altair OptiStruct – LGDISP support for Anisotropic Materials

LGDISP support for anisotropic materials with OptiStruct.

Tips & Tricks

Altair OptiStruct – Equivalent Plastic Strain Response for optimization

Equivalent plastic strain response for optimization with OptiStruct.

Tips & Tricks

Altair OptiStruct – Contact Pressure/Force as a Response for optimization

Contact Pressure/Force as a response for optimization with OptiStruct.

Tips & Tricks

Altair OptiStruct – Failure response for topology optimization

Failure response for topology optimization in OptiStruct.

Tips & Tricks

Altair OptiStruct – Neuber optimization response in nonlinear subcase

Neuber optimization response in nonlinear subcase in OptiStruct.

Tips & Tricks

Altair OptiStruct – Manufacturing constraints for composite optimization

Manufacturing constraints for composite optimization with OptiStruct.

Tips & Tricks

OptiStruct - Equivalent Plastic Strain Response for Optimization

Equivalent plastic strain can be used as an internal response when a nonlinear response optimization is run using the equivalent static load method. This is made possible through the use of an approximated correlation between linear strain and plastic strain, which are calculated in the inner and outer loops respectively, of the ESL method.

Tips & Tricks

OptiStruct - Contact Pressure, Force as a Response for Optimization

Contact Pressure can be used as an internal response when a model with contact and optimization is run. Contact pressure response is activated using RTYPE=CNTP option. The PTYPE should be set to CONTACT and the corresponding CONTACT Bulk Data ID(s) can be referenced on the ATTi field.

Tips & Tricks

OptiStruct - Failure Response for Topology Optimization

Factor of Safety (FOS) and margin of safety (MOS) optimization responses are now available for Topology optimization. It is calculated using NORM approach on design domain. All optimization types are now supported including Topology.

Tips & Tricks

OptiStruct - Neuber Optimization Response in Nonlinear Subcase

Neuber Stress and Neuber Strain sensitivities are supported for optimization in small displacement NLSTAT. It was already supported for optimization in FASTCONT analysis. It is supported only for small displacement analysis, it is not supported for large displacement. Once Neuber response is defined, the material will be treated as linear and MATS1 props are used only for Neuber correction. It is supported for solids as well as shells. It is supported for all optimization types except topology & freesize optimization.

Tips & Tricks

OptiStruct - Manufacturing Constraints for Composite Optimization

Certain manufacturing constraints are important when designing composite laminates, like balancing of plies, thickness of plies, etc. ln OptiStruct, manufacturing constraints can be defined during free size optimization, shuffling optimization for a better manufacturability and desired stacking sequence. The following are some of the manufacturing constraints which can be used depending on the requirement.

Tips & Tricks

5 ways to optimize your design

Gauge optimization, size and shape, and shell optimization, can be used to improve an existing design without altering its overall architecture. 3D topology optimization can be used when a significant re-design is desired because it identifies the optimal load paths of a structure and recommend material reduction. The material layout produced in the 3D topology is then interpreted into a concept design which is dimensioned and fine-tuned with the gauge, size, and shape approaches resulting in a final structure. Do you want to learn how to execute all the techniques mentioned? Step-by-step tutorials are available now for download!

Tips & Tricks

Improving E-Motor Acoustics with Seamless Multiphysics Simulation

Discover Altair SimLab's automated workflow for coupled electromagnetic and vibration analysis. SimLab uses Altair Flux for electromagnetic analysis and Altair OptiStruct for vibro-acoustic simulation.

Webinars

HyperWorks for Aerospace Applications v2017

The HyperWorks for Aerospace self-paced course covers the critical processes used in the creation of FEA models in the Aerospace industry. This course contains 12 modules covering aspects from model setup to post processing. Each module contains background information on the tools used and practical exercises with recorded demonstrations to help you get familiar with the tools and processes. Note: This course requires a login to Connect to view.

eLearning

Introduction to OptiStruct for Structural Optimization

The purpose of this self paced course is to cover the basics of OptiStruct Optimization. The course contains modules introducing the basic optimization types and giving an over of each. Many exercises are available in the modules that use the See It, Try It methodology. See It allows you to watch a video demonstration of the exercise covered in the section, while Try It gives you a pdf and model to try it in the software on your own. Note: This course requires a login to Connect to view.

eLearning

Introduction to OptiStruct for Linear Analysis

The purpose of this self paced course is to cover the basic topics for OptiStruct Linear Analysis. The Setup sections will use the See It, Try It, Do It methodology to cover the concepts. See It allows you to watch a video demonstration of the exercise covered in the section. Note: This course requires a login to Connect to view.

eLearning
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