On the practical application of the method of complex path-independent integrals to problems of fracture mechanics

N. I. Iockimidis

doi:10.1007/bf00035104

On the practical application of the method of complex path-independent integrals to problems of fracture mechanics

International Journal of Fracture ◽

10.1007/bf00035104 ◽

1988 ◽

Vol 36 (3) ◽

pp. R51-R54

Author(s):

N. I. Iockimidis

Keyword(s):

Fracture Mechanics ◽

Practical Application

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Fracture mechanics in design and service: ‘living with defects’ - Application of fracture mechanics to rubber articles, including tyres

Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences ◽

10.1098/rsta.1981.0018 ◽

1981 ◽

Vol 299 (1446) ◽

pp. 189-202 ◽

Cited By ~ 18

Keyword(s):

Fracture Mechanics ◽

Crack Growth ◽

Strain Energy ◽

Tensile Failure ◽

Practical Application ◽

Complicated Fracture ◽

Fracture Work

The use of a fracture mechanics approach, based on the rate of release of strain energy, to account for various features of the failure of vulcanized rubbers is outlined. The properties considered include those to which fracture mechanics is often applied — tear, tensile failure, crack growth and fatigue — and others to which its application is less usual — abrasion, ozone attack and cutting by sharp objects. The relation of macroscopically observed properties to the basic molecular strength of the material is also discussed. An example of a quantitative practical application of the rubber fracture work, to groove cracking in tyres, is then considered. Finally, the rather more complicated fracture that can occur in rubber—cord laminates is discussed and it is shown that the energetics approach can be applied to some features, at least, of this.

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Application of Constraint-Sensitive Fracture Mechanics to the Assessment of Girth Weld Integrity

2004 International Pipeline Conference, Volumes 1, 2, and 3 ◽

10.1115/ipc2004-0525 ◽

2004 ◽

Author(s):

Yong-Yi Wang ◽

Ming Liu ◽

David Horsley

Keyword(s):

Fracture Mechanics ◽

Ductile Fracture ◽

Experimental Evidence ◽

Practical Application ◽

Constraint Effect ◽

Potential Applications ◽

Constraint Effects ◽

Assessment Procedures ◽

Cracked Specimens ◽

Fracture Processes

It has been known since the 1960’s that the crack-tip fields of specimens containing sharp cracks depend on the mode of loading. Experimental evidence has shown that cracked specimens loaded in bending have lower toughness than the same material loaded in tension. This phenomenon has been attributed to the “constraint effect” on fracture. Modern constraint-sensitive fracture mechanics has brought about fundamental theoretical understandings on the constraint effects. The constraint-sensitive fracture mechanics has moved from academic circles to practical application, as evident by a number of recently published fitness-for-service (FFS) assessment procedures that incorporates the constraint effects. This paper reviews the developments in constraint-sensitive fracture mechanics with the focus on its potential applications to the assessment of pipeline girth weld integrity. The review covers (1) constraint theories and experimental evidences, (2) constraint models for brittle and ductile fracture, and (3) limitations of current constraint models. The paper closes with thoughts on the applications of the constraint models and theories to ductile fracture processes, which are the most relevant to modern linepipes and their welds.

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