Multi-Body Contact Archives - ESRD

StressCheck Tutorial: New Assembly Meshing/Auto Contact Features in StressCheck v12.0

brent — Wed, 11 Sep 2024 20:11:43 +0000

A new and powerful assembly automeshing/automatic contact detection feature is now available with the release of StressCheck v12.0. Before automeshing an assembly of close-contacting solid bodies, users may enable the "Assembly Meshing" option to enforce element face matching between neighboring surfaces (to within a user-specified tolerance). Once the solid bodies have been automeshed, StressCheck will automatically create contact zones between matched neighboring element faces and assign contact pairs via the new Auto Contact constraint method to the current constraint ID (if existing, otherwise StressCheck will use "AUTO_CONT" as the constraint ID). Individual contact pairs generated via the Auto Contact method may specified as Contact (the default, traditional multi-body contact), Fused (if element face matching was 100% successful, matched element faces are bonded) or Free (matched element faces are free). Note that if individual contact pairs are specified as Contact, and a parameter is not used for the Contact Constant, the Contact Constant value is computed from the assigned material property data and will be updated if one or more of the material properties are modified. This tutorial revisits a previous 3D multi-body contact example and utilizes assembly automeshing/automatic contact detection to significantly reduce the amount of setup time for multi-body contact analysis. The tutorial also demonstrates how refining the automesh (or updating a parameter value which triggers a re-mesh) will result in the re-generation of the contact zones/contact pairs.

ASIP 2023 Training – Enhancements in StressCheck v12.0 for DaDT Analysis of 3D Fastened Connections

brent — Thu, 07 Dec 2023 15:55:57 +0000

Abstract: this 2-hour training course, originally presented at the ASIP 2023 conference in Denver, CO, explored the following topics:

StressCheck’s FEA technology implementation for the modeling, meshing and analysis of arbitrarily shaped 3D crack geometries, with and without the local effects of multi-body contact.
Strategies for automatic meshing of 3D cracks with high-aspect ratio, 3D-solid pentahedral and hexahedral elements to support high-quality SIF extractions at any location on the crack front.
New StressCheck 12.0 method to support multi-body contact assembly meshing, auto-detection of contact regions, and automatic assignment of contact pairs for 3D solid bodies.

StressCheck Tutorial: Improving Multi-Body Contact Efficiency and Quality via Hexa/Penta Boundary Layer Refinement

brent — Fri, 17 Mar 2023 15:41:01 +0000

Abstract: demonstration of how refining surfaces in contact with at least one hexa-dominant mesh layer (via the mixed Boundary Layer automesh method) improves the outcomes of multi-body contact solutions. The mixed Boundary Layer automesh method is available as of StressCheck v11.1. For more details, refer to MeshSim Automesh Generation Methods.

Webinar: Benefits of Mixed Meshing for Multi-Body Contact Applications

brent — Mon, 13 Mar 2023 20:42:18 +0000

[vc_row][vc_column width="1/2"][vc_message message_box_color="peacoc" icon_fontawesome="fa fa-lightbulb-o"]March 13, 2023 @ 1:00 pm EST[/vc_message][vc_column_text]Strategies for incorporating advanced mixed (hexa/penta) automeshing techniques for improved quality and efficiency of 3D multi-body contact applications will be explored.[/vc_column_text][vc_cta h2="" add_button="right" btn_title="WATCH NOW" btn_color="danger" btn_link="url:%23recording|||"]This webinar is now available to watch on-demand.[/vc_cta][/vc_column][vc_column width="1/2"] [caption id="attachment_27442" align="alignnone" width="1166"] 3D Splice Plate problem definition (top right), mixed mesh taking advantage of symmetry (top left) and plate von Mises stresses (bottom).[/caption] [/vc_column][/vc_row][vc_row][vc_column][vc_column_text]

WEBINAR SUMMARY

[/vc_column_text][vc_custom_heading text="In this 3-part, pre-recorded 40-minute webinar we will present how the automeshing enhancements now available in StressCheck v11.1 significantly aid in the rapid generation of penta- and hexa-dominant meshes for use in 3D multi-body contact applications. To realize these concepts in a practical setting, a 3D splice joint assembly will be constructed, analyzed and post-processed, with detailed commentary on each step in the workflow process." font_container="tag:p|text_align:left" use_theme_fonts="yes"][/vc_column][/vc_row][vc_row][vc_column][vc_column_text]

WEBINAR HIGHLIGHTS

[/vc_column_text][vc_column_text]Part 1: Model Definition & Parametric Geometry Construction

Problem definition, scope and use of symmetry to reduce model size
Importation of a parameter file (.par)
Construction of 3D parametric solid bodies (boxes, cylinders, cones, etc.)
Boolean union/subtraction operations between 3D solid bodies to define 3D splice joint parts
Copy operations to duplicate child fastener bodies from a single parent fastener body
Body-to-body imprints between all parts for optimization of contacting surfaces

Part 2: Part Definition, Contact Zone Setup, Mixed Mesh Generation, Material Properties & Boundary Conditions

Creation of Parts for efficient bookkeeping and visualization
Generation of the solid mixed meshes for each Part via Global, Boundary Layer and Thin Section automesh methods
Creation of contact zones for Part regions expected to be in contact
Definition and assignment of material properties to each Part
Assignment of boundary conditions (loads and constraints) to each Part
Assignment of contact pairs to allow gap and pressure computations between Part contact zones

Part 3: Solution Setup, Execution and Post-Processing

Linear multi-body contact solution setup and initiating the solver
Evaluation of max contact pressure error, solve time and degrees of freedom solved (DOF)
Plotting the deformation of the 3D splice joint assembly
Plotting of von Mises stresses for each Part in the 3D splice joint assembly
Unaveraged vs. averaged von Mises stresses for each plate Part
Computing the stress resultants to ensure quality load transfer between Parts
Summary and wrap-up

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StressCheck Tutorial: Multi-Body Contact Analysis of a Block and Half-Cylinder

brent — Wed, 21 Sep 2022 14:13:34 +0000

Abstract: indenter-style problem of a block and loaded half-cylinder in multi-body contact is analyzed. The following tips and best practices will be explored:

Optimization of geometric surfaces for efficient multi-body contact.
Creation of contact zones on optimized surfaces.
Selection of the appropriate contact constant based on configuration (area in contact, material properties, load magnitude, etc).
Cancellation of rigid body translations/rotations.
Multi-body contact solution setup.
Assessment of final gap for penetration.
Assessment of contact pressure gradient continuity.
Assessment of load transfer via stress resultant extraction.
Mesh refinement with mixed boundary layers to improve contact pressure gradient.

For more details, refer to Multi-Body Contact Overview and Numerical Simulation Series: Mechanical Contact.

StressCheck Tutorial: Filled vs Open Hole SIF Comparison for 3D Offset Hole

brent — Tue, 16 Nov 2021 16:38:35 +0000

Abstract: comparison of 3D part-thru crack stress intensity factor (SIF) distributions for filled (pin-propped) vs open (bearing-loaded) offset holes. Simultaneous solution and extractions based on Parts and Solution Configurations.

Getting Started with StressCheck: e-Learning Video Showcase

brent — Tue, 16 Feb 2021 14:39:52 +0000

This tailored e-Learning video collection provides an introduction to the technology and usage of StressCheck Professional, with selected presentations, tutorials, demos and practical applications. [video_embed url="https://vimeo.com/401205205/0d3c097b99" embed_style="default"] The video collection contains 22 videos for a total of approximately four (4) hours of e-Learning material. Hovering over a video thumbnail will reveal its intended viewing order and topic, and clicking on a video thumbnail will load its video in the space below. Note: all on-demand videos are also available for streaming on the ESRD Resource Library in the Demo Video and Tutorial Video categories.

StressCheck Tutorial: Multi-Body Contact Solver Options/Plot Functions

brent — Fri, 22 Jan 2021 16:30:44 +0000

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CAE Handbook Demo: 3D Attachment Lug

brent — Tue, 19 Jan 2021 16:04:58 +0000

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Numerical Simulation Series: Mechanical Contact

brent — Tue, 13 Oct 2020 22:42:03 +0000

Abstract: In this edition of ESRD's Numerical Simulation Series, the computation of mechanical contact via numerical simulation is examined in detail. Highlights include:

The modified augmented Lagrangian algorithm for frictionless contact
Mechanical contact implementation and examples
Modeling of fastened structural connections
The fastener and link objects
Remarks on current modeling practices for fastened structural connections
Model problems.