NEW EXPERIMENTAL METHOD IN THREE-DIMENSIONAL ELASTOSTATICS

This paper deals with a method that overcomes the difficulties encountered when the "freezing" methods of three-dimensional photoelasticity are used. The present methods use materials which exhibit a Poisson's ratio equal to 0.5 at the critical temperature. Two important limitations follow: (1) the solution obtained applies only to materials with high Poisson's ratio. (2) Stresses can be determined only by integrating equations of equilibrium because it is not possible to supplement birefringence measurements with mechanical or moire measurements. The new method uses a material with Poisson's ratio equal to about 0.4. Since the deformations are relatively large, (of the order of 1%) and the material is not incompressible, mechanical or moire measurements can be used to supplement birefringence measurements. If desired the method can be self sufficient and solve completely three-dimensional problems using only mechanical or moire measurements. A sphere subjected to diametral loading is used to illustrate the application of the method and the precision of the results obtained.

• Corporate Authors:

  Catholic University of America

  School of Engineering and Architecture
  Washington, DC  United States  20019
• Authors:
  • Durelli, A J
  • Hasseem, H M
  • Parks, V J
• Publication Date: 1973-12

Media Info

• Features: References;
• Pagination: 37 p.
• Serial:
  • Issue Number: 33

Subject/Index Terms

• TRT Terms: Photoelasticity; Structural analysis
• Old TRIS Terms: Elastostatics
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00051236
• Record Type: Publication
• Source Agency: Ship Structure Committee
• Contract Numbers: N0014-67A-0377-0011
• Files: TRIS
• Created Date: Feb 28 1974 12:00AM