Predictions of J-R curves with large crack growth from small specimen data

Technical Report · Mon Sep 01 04:00:00 EDT 1986

OSTI ID:5049984

Papaspyropoulos, V; Marschall, C; Landow, M

This report examines the practice of extrapolating small-specimen J-resistance curves for use in predictive analyses of large crack growth in nuclear pipes prior to instability. The study involved a combined experimental and analytical effort. The experimental effort included tests of 1.0-inch (25.4-mm)-thick compact (tension) specimens of 1T, 3T, and 10T planar dimensions. Both side-grooved and nonside-grooved specimens of Type 304 stainless steel and A516 Grade 70 carbon steel were tested at 550 F (288 C). The data were analyzed using deformation-J (J/sub D/) and modified-J (J/sub M/) estimation schemes to develop resistance curves. Also, elastic-plastic finite element analyses were performed of 1T, 3T, and 10T nonside-grooved specimen data for Type 304 stainless steel. The results of these analyses were then used to assess the extrapolation procedures. The study suggests that extrapolations of J/sub D/-resistance curves to large amounts of crack growth result in large underestimates of the fracture resistance of the material. The extrapolations of J/sub M/-resistance curves, although providing more accurate estimates of resistance to fracture, may result in overestimates. In general, the far-field finite element J-resistance curves were in better agreement with J/sub M/ than with J/sub D/-resistance curves.

• Research Organization: Battelle Columbus Div., OH (USA)
• OSTI ID: 5049984
• Report Number(s): NUREG/CR-4575; BMI-2137; ON: TI87900008
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220200* -- Nuclear Reactor Technology-- Components & Accessories
42 ENGINEERING
420500 -- Engineering-- Materials Testing
COMPUTERIZED SIMULATION
CRACK PROPAGATION
FINITE ELEMENT METHOD
FRACTURE MECHANICS
MECHANICS
NUMERICAL SOLUTION
PIPES
SIMULATION
TESTING