Accession Number : AD0674117

Title :   A NUMERICAL COMPUTATION OF THERMAL AND RESIDUAL STRESSES IN A DISK IN THE ELASTIC-PLASTIC MODE RESULTING FROM A WELD DEPOSITED IN A CENTRALLY LOCATED HOLE, AND CORRELATION WITH EXPERIMENTAL RESULTS. PART I. THIN DISK ANALYSIS. PART II. THICK DISK ANALYSIS.

Descriptive Note : Final rept. 1 Oct 64-31 Oct 66,

Corporate Author : VERMONT UNIV BURLINGTON

Personal Author(s) : Duchacek,Howard ; Brosseau,Timothy L. ; Lee,Robert B. ; Stearns,Burdett K.

Report Date : 31 OCT 1966

Pagination or Media Count : 88

Abstract : Methods of solution to three problems of transient thermal stress and strain in the elastic-plastic mode are presented. Deformation theory is used in conjunction with the equilibrium, continuity, and compatibility equations to calculate the stress and strain at any radial location and time instant in a thin solid disk or hollow disk which is centrally heated or a hollow disk which is heated centrally and filled with weld material at some time instant. As a part of the experimental program, steel disks of 12 in. diameter are used as test vehicles to determine residual stresses owing to welds performed on the same. The disks are drilled centrally and axially and have welds deposited which fill the holes by the MIG process. Strain gages and a cutting technique is used in the measurement of residual strains and stresses. The residual stresses as determined from the experimental program are found to agree fairly well with the residual stresses determined from the computer program. An attempt was made to obtain a solution for the case of a thick disk subjected to axisymmetrical heating, where the stresses and temperature vary in the axial as well as the radial direction. The necessary finite difference equations and program-flow for such a solution, for the elastic case, have been established. Additional work is required to permit efficient programming and to include changes for the plastic case. (Author)

Descriptors :   (*WELDS, *STRESSES), DISKS, THERMAL STRESSES, NUMERICAL ANALYSIS, STRAIN(MECHANICS), TRANSIENTS, MODEL TESTS, COMPUTER PROGRAMMING, INERT GAS WELDING, COMPUTER PROGRAMS

Subject Categories : Computer Programming and Software
      Couplers, Fasteners, and Joints
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE