
Accession Number : AD0655838
Title : ON NONLINEAR STEADYSTATE SOLUTIONS TO MOVING LOAD PROBLEMS.
Descriptive Note : Technical rept.,
Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF THE AEROSPACE AND MECHANICAL ENGINEERING SCIENCES
Personal Author(s) : Hegemier,G. A.
Report Date : JUN 1967
Pagination or Media Count : 26
Abstract : In certain moving load problems involving elastic solids or structures with an idealized infinite or semiinfinite spatial domain, steadystate solutions of the governing equations of motion are frequently sought as an alternative to a more complex transient analysis. In seeking a solution of this type the implication is, of course, that it represents the limit of a transient problem. While this appears to be generally true of wellposed linear elastic problems, the same cannot be said of nonlinear elastic formulations. To substantiate this point the case of an infinite length string supported by a nonlinear elastic foundation and subjected to a concentrated load moving with constant velocity is studied in this paper. It is shown that although the steadystate solution of the problem is unique for load velocities both above and below the signal velocity of the string, that above is locally unstable and therefore cannot represent the limit of transient motions. (Author)
Descriptors : (*LOADS(FORCES), EQUATIONS OF MOTION), SOLIDS, STRUCTURES, STRUCTURAL PROPERTIES, STABILITY, NONLINEAR SYSTEMS
Subject Categories : Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE