Material properties for fracture mechanics based strength assessment of cast iron water mains

Author:

Debnath Suborno1,Ali Ismail M.2,Dhar Ashutosh Sutra2,Thodi Premkumar3

Affiliation:

1. Northern Crescent Inc., Calgary, AB, Canada.

2. Department of Civil Engineering – Memorial University of Newfoundland, St. John’s, NL, Canada.

3. C-CORE, St. John’s NL, Canada.

Abstract

Municipal water distribution systems in Canada and other countries include a large number of cast iron pipes that were installed almost 50 years ago. For structural integrity assessment of these pipes, the fracture mechanics approach is found to be more effective than the conventional continuum mechanics-based approach. This paper presents the mechanical properties for fracture mechanics-based strength assessment of water mains determined through testing of cast iron pipes exhumed from two cities in Canada. Microstructure analysis is conducted to understand the materials’ inherent properties. Uniaxial tensile tests are conducted to determine the stress–strain relations. The influence of the rate of loading on stress–strain behaviour and loading-unloading responses are investigated. A simplified single-edge notch beam test is used to obtain the fracture toughness. Probabilistic distributions of the parameters are provided to account for the uncertainty and variabilities observed in the test results.

Publisher

Canadian Science Publishing

Subject

General Environmental Science,Civil and Structural Engineering

Reference35 articles.

1. Ali, I. 2017. Mechanical properties of an exhumed cast iron pipe material. M.Eng. thesis, Memorial University of Newfoundland. St. John’s, Newfoundland, Canada.

2. Angus, H.T. 1976. Cast iron: physical and engineering properties. 2nd ed. Butterworths, London, U.K.

3. ASTM. 2001. Standard test method for measurement of fracture toughness. ASTM E1820-01. American Society for Testing and Materials, Philadelphia, Pa. 10.1520/E1820-01.

4. ASTM. 2016. Standard test methods for tension testing of metallic materials. ASTM E8/E8M-16a. American Society for Testing and Materials, Philadelphia, Pa. 10.1520/E0008_E0008M-16A.

5. Attewell, P.B., Yeates, J., and Selby, A.R. 1986. Soil movements induced by tunnelling and their effects on pipelines and structure. Chapman & Hall.

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