Apparatus and method for creating analysis model for an elastomeric material member with a strong nonlinearity

• US 20080172213A1
• Filed: 11/20/2007
• Published: 07/17/2008
• Est. Priority Date: 01/16/2007
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Imai, Kanako
• Granted Patent: US 8,560,288 B2
• Time in Patent Office: Days
• US Class Current: 703/7
• CPC Class Codes: G06F 30/20 Design optimisation, verification or simulation optimisation, verification or simulation of circuit designs G06F30/30

Abstract

A simple analysis model for an elastomeric material member with a strong nonlinearity is created, that is, for a rubber member gripped between a first member and a second member, first shell elements are created for the contact surface of the rubber member contacting the first member, second shell elements are created for the contact surface of the rubber member contacting the second member, and spring elements are created between specific nodes of the first and second shell elements. The spring constant of the created spring elements is identified by data of material tests.

Claims

1. An apparatus for creating an analysis model of an elastomeric material member with a strong nonlinearity gripped between a first member and a second member, comprising:

a shell element creation unit creating first shell elements at node intervals found based on at least a total length of the elastomeric material member at a first contact surface of the elastomeric material member contacting the first member and creating second shell elements the same as the first shell elements at a second contact surface of the elastomeric material member contacting the second member,

a spring element creation unit creating spring elements between nodes of the first and second shell elements, and

a spring constant identification unit identifying a spring constant of the spring elements.

2. An apparatus as set forth in claim 1, wherein said shell element creation unit creates the first shell elements at said first contact surface using the spring intervals as the node intervals and creates the second shell elements by copying said first shell elements on said second contact surface.

3. An apparatus as set forth in claim 1 or 2, wherein said spring element creation unit extracts node numbers of said created first and second shell elements in an orderly fashion and creates spring elements between the extracted nodes.

4. An apparatus as set forth in claim 1, wherein

said shell element creation unit finds said node intervals to create first and second shell elements so that intervals become equal intervals common for the total length of the elastomeric material member and a length of a test piece of said elastomeric material member for part of said elastomeric material member,

said spring element creation unit creates spring elements between nodes of the created first and second shell elements to create a test model, and

said spring constant identification unit identifies the spring constant of said test model using material test data of said elastomeric material member.

5. An apparatus as set forth in claim 4, wherein said shell element creation unit creates first and second shell elements at the same node intervals as the node intervals of the test model for said elastomeric material member as a whole, and said spring element creation unit creates spring elements between the nodes of the created first and second shell elements and uses the spring constant of said identified test model as the spring constant.

6. A storage medium having stored thereon a computer program to create an analysis model of an elastomeric material member with a strong nonlinearity gripped between a first member and a second member, which program makes a computer perform

a shell element creation function creating first shell elements at node intervals found based on at least a total length of said elastomeric material member at a first contact surface of said elastomeric material member contacting said first member and creating second shell elements the same as said first shell elements at a second contact surface of said elastomeric material member contacting said second member,

a spring element creation function creating spring elements between nodes of said first and second shell elements, and

a spring constant identification function identifying a spring constant of said spring elements.

7. A storage medium as set forth in claim 6, wherein said shell element creation function creates the first shell elements at said first contact surface using the spring intervals as the node intervals and creates the second shell elements by copying said first shell elements on said second contact surface.

8. A storage medium as set forth in claim 6, wherein said spring element creation function extracts node numbers of said created first and second shell elements in an orderly fashion and creates spring elements between the extracted nodes.

9. A storage medium as set forth in claim 6, wherein

said shell element creation function finds said node intervals to create first and second shell elements so that intervals become equal intervals common for the total length of the elastomeric material member and the length of the test piece of said elastomeric material member for part of said elastomeric material member,

said spring element creation function creates spring elements between nodes of the created first and second shell elements to create a test model, and

said spring constant identification function identifies the spring constant of said test model using material test data of said elastomeric material member.

10. A method for creating an analysis model of an elastomeric material member with a strong nonlinearity gripped between a first member and a second member, which method comprises,

determining spring intervals for part of said elastomeric material member by finding the same intervals common to a test piece of said elastomeric material member and said analysis model on the basis of a length of said test piece and a total length of said elastomeric material member,

creating first shell elements at node intervals at a first contract surface of said elastomeric material member contacting said first member using said spring intervals as node intervals,

creating second shell elements the same as the first shell elements on a second contact surface of said elastomeric material member contacting said second member, and

creating a test model by arranging spring elements between nodes of said first and second shell elements, and

using the test model to identify the spring constant of said spring elements.

11. A method as set forth in claim 10, further comprising,

creating first shell elements for said elastomeric material member as a whole using said spring intervals as node intervals at the first contact surface of said elastomeric material member contacting said first member,

creating second shell elements the same as the first shell elements on the second contact surface of said elastomeric material member contacting said second member, and

creating an analysis model by arranging spring elements between nodes of said first and second shell elements, and

using the identified spring constant as the spring constant of said analysis model.

12. A method as set forth in claim 10, wherein said step of creating second shell elements creates the second shell elements by copying said first shell elements on said second contact surface.

13. A method as set forth in claim 10, wherein said step of creating spring elements extracts node numbers of said created first and second shell elements in an orderly fashion and creates spring elements between the extracted nodes.

14. A method for designing electronic equipment having an elastomeric material member with a strong nonlinearity gripped between a first member and a second member, comprising

creating an analysis model having an identified spring constant comprising first shell elements created on a first contact surface of said elastomeric material member contacting said first member, second shell elements the same as the first shell elements created on a second contact surface of said elastomeric material member contacting said second member, and spring elements created between nodes of said first and second shell elements,

using said analysis model to judge if the design conditions have been satisfied and, when said design conditions have not been satisfied, changing the design of at least one of said first member, said second member, or said elastomeric material member.