DEVELOPMENT OF EXPERIMENTAL STRESS ANALYSIS METHODS TO DETERMINE STRESSES AND STRAINS IN SOLID PROPELLANT GRAINS. PHOTOELASTIC ANALYSIS OF FLEXURAL WAVES IN A BAR.
Abstract
A complete, direct, full-field optical determination of dynamic stress distributions is illustrated. The method is applied to the study of flexural waves propagating in a photoelastic, urethane rubber bar. A displacement type of transverse, dynamic loading (which has approximately the form of a decaying sine wave) is applied at one end of the bar. The loading pulse can be repeated with good precision. Individual isochromatics and isoclinics are obtained using a still camera with a short duration (0.5 microsecond) flash. A series of isochromatics have also been obtained with a Fastax high speed motion picture camera. Photoelastic data is supplemented by isopachic patterns obtained by a modified method of holographic interferometry recently developed by the authors. As an example of complete determination of stress distributions a vectorial representation of the principal stresses at one instant is given. Comparisons are made with approximate theories of flexural waves. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1969
- Accession Number
- AD0688149
Entities
People
- Augusto J. Durelli
- J. A. Clark
Organizations
- The Catholic University of America