ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 8

The Use of Miniaturized Tests to Predict Flow Properties and Estimate Fracture Toughness in Deformed Steel Plates

Haggag, FM
Oak Ridge National Laboratory, Oak Ridge, TN

Server, WL
Tenera Engineering Services, Berkeley, CA

Lucas, GE
University of California-Santa Barbara, Santa Barbara, CA

Odette, GR
University of California-Santa Barbara, Santa Barbara, CA

Sheckherd, JW
University of California-Santa Barbara, Santa Barbara, CA

(Received 23 August 1988; accepted 7 July 1989)

Abstract

Prediction of failure in a structure requires knowledge of the mechanical properties of the materials involved. In the case of serious accidents, such as derailments of railroad tank cars carrying hazardous materials, prediction of failure in damaged components is impeded by difficulties in determining the deformed material fracture toughness, the cracks induced by the accident, and the stress state in the damaged region. This paper addresses the problem of determining fracture toughness. Miniaturized shear punch tests on virgin, strained, and deformed steel plates (typical of railroad tank car construction) were conducted over a wide range of test temperatures. These data were compared with tensile properties measurements on identical materials. The use of these data coupled with micromechanical models of fracture allows estimation of the deformed material fracture toughness. Comparisons of the predicted fracture toughness with actual measurements are made.

Keywords:
miniaturized tests, shear punch test, ball indentation test, mechanical properties, fracture toughness, instrumented precracked Charpy, tearing modulus, deformed steel plates

Paper ID: JTE12452J
DOI: 10.1520/JTE12452J
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