Analytical approach for calculating KIC from eccentrically cracked cylindrical specimens

Raafat N. Ibrahim, Andrei G. Kotousov

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

13 Citations (Scopus)


This paper presents the latest results of an extensive research program started in 1985 on the cylindrical notched test (CNT) specimen that evaluates fracture toughness. Specimen geometry is the cheapest methodology in manufacturing which can produce values for fracture toughness and is also smaller than the standard compact tension test (CTT) specimen. The CNT specimen has many advantages and can be used in many applications that are not possible with standard CTT specimens. Requirements for the minimum diameter of the CNT specimen are discussed and compared with the similar requirements for the CTT specimen. As was reported earlier however, a major problem in CNT specimen testing is that only a very small part of all samples has the pure co-circular geometry after pre-cracking which is suitable for analytical consideration. The present paper discusses an approximate analytical approach was developed to estimate the fracture toughness from specimens with an eccentrically displaced ligament. This approach is suitable for the calculation of the stress intensity factor for many eccentrically and externally cracked bodies. It has been validated by comparison with FE results and known analytical solutions. The testing procedure and the analytical approach presented agree well with independent CTT specimen testing results.

Original languageEnglish
Title of host publicationAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Number of pages7
Publication statusPublished - 1 Dec 1999
EventASME Pressure Vessels and Piping Conference (PVP) 1999 - Boston, United States of America
Duration: 1 Aug 19995 Aug 1999


ConferenceASME Pressure Vessels and Piping Conference (PVP) 1999
Abbreviated titlePVP 1999
Country/TerritoryUnited States of America
OtherFracture, Design Analysis of Pressure Vessels, Heat Exchangers, Piping Components, and Fitness for Service - 1999 (The ASME Pressure Vessels and Piping Conference)

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