Project

Author

Ivan Podadera

Subject

Vacuum cavity

Prepared For

CERN

Project Created

Thursday, October 23, 2003 at 2:40:15 PM

Project Last Modified

Friday, October 24, 2003 at 9:01:58 AM

Report Created

Friday, October 24, 2003 at 9:09:35 AM

Software Used

ANSYS 7.1

Database

C:\RFQ mechanical drawings\Assembly cavity(for DS).dsdb

1. Summary

This report documents design and analysis information created and maintained using the ANSYS^® engineering software program. Each scenario listed below represents one complete engineering simulation.

Scenario 1

• Based on the Autodesk^® Mechanical Desktop^® assembly "C:\RFQ mechanical drawings\Assembly cavity(for DS).dwg".
• Considered the effect of body-to-body contact, acceleration, structural loads and structural supports.
• Calculated structural results.
• No convergence criteria defined.
• No alert criteria defined.
• See Scenario 1 below for supporting details and Appendix A1 for corresponding figures.

2. Introduction

The ANSYS CAE (Computer-Aided Engineering) software program was used in conjunction with 3D CAD (Computer-Aided Design) solid geometry to simulate the behavior of mechanical bodies under thermal/structural loading conditions. ANSYS automated FEA (Finite Element Analysis) technologies from ANSYS, Inc. to generate the results listed in this report.

Each scenario presented below represents one complete engineering simulation. The definition of a simulation includes known factors about a design such as material properties per body, contact behavior between bodies (in an assembly), and types and magnitudes of loading conditions. The results of a simulation provide insight into how the bodies may perform and how the design might be improved. Multiple scenarios allow comparison of results given different loading conditions, materials or geometric configurations.

Convergence and alert criteria may be defined for any of the results and can serve as guides for evaluating the quality of calculated results and the acceptability of values in the context of known design requirements.

• Solution history provides a means of assessing the quality of results by examining how values change during successive iterations of solution refinement. Convergence criteria sets a specific limit on the allowable change in a result between iterations. A result meeting this criteria is said to be "converged".
• Alert criteria define "allowable" ranges for result values. Alert ranges typically represent known aspects of the design specification.

The discussions below follow the organization of information in the ANSYS "Explorer" user interface. Each scenario corresponds to a unique branch in the Explorer "Outline". Names emphasized in "double quotes" match preferences set in the user interface.

All values are presented in the "Metric (mm, kg, MPa, °C, s)" unit system.

Notice

Do not accept or reject a design based solely on the data presented in this report. Evaluate designs by considering this information in conjunction with experimental test data and the practical experience of design engineers and analysts. A quality approach to engineering design usually mandates physical testing as the final means of validating structural integrity to a measured precision.

3. Scenario 1

3.1. "Model"

"Model" obtains geometry from the Autodesk^® Mechanical Desktop^® assembly "C:\RFQ mechanical drawings\Assembly cavity(for DS).dwg".

• The bounding box for all positioned bodies in the model measures 361.0 by 387.0 by 964.0 mm along the global x, y and z axes, respectively.
• The model weighs a total of 82.49 kg.

3.1.1. Contact

• "Contact" uses a tolerance of 0.0 for automatic detection.
• "Contact" is set to use symmetric contact.

3.1.2. Mesh

• "Mesh", associated with "Model" has an overall relevance of -100.
• "Mesh" contains 122457 nodes and 54452 elements.

No mesh controls specified.

3.2. "Environment"

"Environment" contains all loading conditions defined for "Model" in this scenario.

Standard Earth Gravity

• Magnitude: 9,806.65 mm/s²
• Vector: [0.0 x, 9,806.65 y, 0.0 z] in the global coordinate system

The following tables list local loads and supports applied to specific geometry.

3.2.1. Structural Loading

3.2.2. Structural Supports

3.3. "Solution"

"Solution" contains the calculated response for "Model" given loading conditions defined in "Environment".

It was selected that the program would choose the solver used in this solution.

3.3.1. Structural Results

• Convergence tracking not enabled.

Appendixes

A1. Scenario 1 Figures

No figures to display.

A2. Definition of "Structural Steel"

• Description: "Fatigue Data at zero mean stress comes from 1998 ASME BPV Code, Section 8, Div 2, Table 5-110.1"
• Material data file: "C:\Program Files\ANSYS Inc\v71\AISOL\CommonFiles\Language\en-us\EngineeringData\Materials\Structural_Steel.xml"

Table A2.1. Thermal Conductivity vs. Temperature

Table A2.2. Alternating Stress vs. Cycles

A3. Definition of "Stainless Steel"

• Material data file: "C:\Program Files\Ansys Inc\v71\AISOL\CommonFiles\Language\en-us\EngineeringData\Materials\Stainless_Steel.xml"

Table A3.1. Thermal Conductivity vs. Temperature

A4. Glossary

Alert Criteria

Alerts cause ANSYS to flag results that exceed minimum or maximum allowable values.

Bonded Contact

Prevents contacting regions on selected faces from sliding or separating. "Glues" the faces together.

Bounding Box

A three-dimensional cube aligned to the global x, y and z axes that exactly contains a body or assembly.

Convergence Tracking

Convergence tracking causes ANSYS to iteratively refine the solution until the criteria for allowable change in the result is met or the maximum number of loops is exhausted.

Frictionless Contact

Models standard nonlinear unilateral contact. Allows free sliding and gaps to form at contact interface.

No Separation

Prevents contacting regions on selected faces from separating. Frictionless sliding may occur.

Relevance

Defines the acceptable accuracy for a body and valuates the importance of bodies in an assembly. The relevance range extends from -100 to +100, where -100 implies maximum software speed and +100 implies maximum accuracy in calculating results.

Rough Contact

Nonlinear contact that allows gaps to form at contact interface but does not allow sliding (infinite coefficient of friction).

Scope

Filters a result to selected geometry. If combined with convergence tracking, focuses refinement activity on the selected geometry.

Visible

A user preference that controls the visibility of bodies in figures in this report. Unlike suppressed bodies, invisible bodies are fully considered in the calculation of results.

A5. Distributing This Report

The following table lists the files that you need to include for posting this report to an Internet or Intranet web server or for moving this report to a different location. Store all files in the same folder as the HTML page.

This report was originally generated in the folder "C:\RFQ mechanical drawings\ANSYS\Reports\".