Elevated-temperature benchmark tests of simply supported beams and circular plates subjected to time-varying loadings

Abstract

This report presents the measured elastic-plastic-creep responses of eight simply supported type 304 stainless stee". beans and circular plates that were subjected to time-vary : \g loadings at elevated temperature. The tests were penc ... J to provide experimental benchmark problem data suitable for assessing inelastic analysis me*hods and for validating com puter programs. Beams and plates exhibit the essential fea tures of inelastic structural behavior; yet they are relatively simple and the experimental results are generally easy to interpret. The stress fields are largely uniaxial in beams, while multiaxial effects are introduced in plates. The speci mens tested were laterally loaded at the center and subjected to either a prescribed load or a center deflection history. The specimens were machined from a common well-characterized heat of material, and all the tests were performed at a tempera ture of 593°C (1100°F). Test results are presented in ternr of the load and center deflection behaviors, which typify the overall structural behavior. Additional deflection data, as well as strain gage results and mechanical properties data for the beam and plate naterial, are provided in the appendices. Each test consisted of four phases, except that beams B9 and B7 and plates CP5 and CP4 were not subjected to precreep cycling.

Evaluations of the Piping System Inelastic Analysis Computer Program PIRAX2

“…Equation (2) can also be used to· calculate strains along the axis of the beam. Figure 6(b) shows comparisons of averaged, measured strains with strains computed by Equat·ion ( 2). Agreement between theory and measured strains is good.…”

“…Figure 2 shows the tensile test data and points representing Equation (4); it can be seen that a good match was made. Reference (2) gives analogous data for beam B9. The material is also type 304, but Heat 9T2796.…”

“…Beam B9 was made of type 304 material, ORNL Heat 9T2796. Reference (2), Table A-2, gives a matrix of uniaxial creep strain data for Heat 9T2796 at 1100 F; covering the range of stresses from 1 to 35 ksi, times from 1 to 10,000 hours. From this data, isochronous stress-creep-strain curves were constructed as shown in Figure 10.…”

Room-Temperature Inelastic Test of a Nozzle-to-Spherical-Shell Model Subjected to Pressure and Moment Loading

“…the following capabilities: (1) magnetic. : tape input/output system,(2) in-core calculation ability, (3) teletypewriter input and output, and (4) signal conditioning and self-calibration of tl~ gages.For this test, the system was programmed to read at a rate of 500 gages per second and record the readings for all gages (82 rosettes) at a rate of once per second. The system records the strain data in millivolt readings on magnetic tape.…”