Choice of Materials on the Basis of Random Vibration and Structural Fatigue,
Abstract
A method is presented for the evaluation of alternative materials to be used in structures subjected to random low cycle excitation. The fracture criterion is based upon the revised Palmgren-Miner cumulative damage hypothesis in terms of plastic deformation. It is then used with a given statistics of random low cycle loading in the formulation to compute the expected value and variance of the life. As a numerical example, two aluminum alloys, one with high strength but low ductibility (2024-T4; yield strength 52 ksi and 'true strain' at fracture 0.35) and another with low strength but high ductibility (6061-T6 yield strength 25 ksi and 'true strain' at fracture 0.45) are considered as alternative materials for use in an idealized beam subjected to random excitation. In this particular case, 2020-T4 even with its higher strength gives smaller expected value of structurel life to fracture. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1970
- Accession Number
- AD0715273
Entities
People
- F. D. Ju
- H. Y. Yeh
- J. T. P. Yao
Organizations
- University of New Mexico