Accession Number:

ADA071022

Title:

The Constraint Method for Solid Finite Elements.

Descriptive Note:

Annual technical rept. 1 Oct 77-30 Sep 78,

Corporate Author:

WASHINGTON UNIV ST LOUIS MO DEPT OF SYSTEMS SCIENCE AND MATHEMATICS

Personal Author(s):

Report Date:

1978-09-01

Pagination or Media Count:

27.0

Abstract:

In conventional approaches to finite element stress analysis accuracy is obtained by fixing the degree p of the approximating polynomial and by allowing the maximum diameter h of elements in the triangulation of approach zero. An alternate approach is to fix the triangulation and to increase the degree of approximating polynomials in those elements where more accuracy it is necessary to have a family of finite elements of arbitrary polynomial degree p with the property that as much information as possible can be retained from the pth degree approximation when computing the pl st degree approximation. Comparison of the optimal beam a variable-section beam with a reference beam a constant-section beam shows that the weight reduction depends strongly on the frequency parameter beta. This weight reduction is negligible for beta approaching 0, is 11.3 per cent for beta 1, is 55.3 per cent for beta 1.4, and approaches 100 per cent for beta approaching 90 degrees. Author

Subject Categories:

  • Theoretical Mathematics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE