Variation of stress intensity factor and elastic T-stress along the crack-front in finite thickness plates

• Main Authors: S. K. Kudari, K. G. Kodancha
• Format: Article
• Language: English
• Published: Gruppo Italiano Frattura 2009-04-01
• Series: Frattura ed Integrità Strutturale
• Subjects: Elastic T-stress; Stress intensity factor; Finite element method; Constraint issue
• Online Access: http://www.gruppofrattura.it/pdf/rivista/numero8/numero_8_art_4.pdf

Non-singular terms in the series expansion of the elastic crack-tip stress fields, commonly referred to as the T-stress. The T-stress is as an additional stress field characterizing parameter to stress intensity factor (K) in the analysis of cracked bodies. T-stress is used as an important constraint parameter in the fracture analysis. In this investigation, three-dimensional finite element analyses have been conducted to compute the elastic T-stress considering a single edge notched tensile (SENT) specimen with varied thickness and a/W ratio. The results indicate that the T-stress depends on the specimen thickness and significantly varies along the crackfront from surface to centre of the specimen. The T-stress results obtained in the present analysis together with corresponding KI values can be used for analysis of constraint effects in a fracture specimen.