RESEARCH ON ENERGY ABSORBING STRUCTURES, PART V.
Abstract
The present program was concerned with extending the theory of large-deflection behavior of plate and shell structures to very-large-deflection-behavior wherein the principal effect to be considered was to account for the moment-arm correction for the load when the structural deflection becomes very large. Although attempts were made to analyze both plate and curved shell structures, the present analysis in terms of numerical evaluation was limited to flat plate structures. Detailed experiments were conducted for both the flat plate and the curved shell in order to obtain correlation of the flat plate numerical results as well as obtain some physical insight into the curved shell problem. A complete description of the low cycle fatigue torsion tester, which has been modified from a NASA contract to include axial tension and compression, is described. Preliminary tests were conducted on 347 stainless steel and two types of aluminum specimens. Preliminary results indicate that the effects of axial tension and compression previously found for low strain values (high cycle fatigue) for the 347 stainless steel and 24 ST aluminum specimens do not necessarily agree with those trends found at low cycle fatigue. However, the effects of tension and compression on low cycle torsion fatigue for the 1100 aluminum specimens do appear to be significant. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1967
- Accession Number
- AD0663434
Entities
People
- Bernard Mazelsky
- T. H. Lin