Establishing a methodology to predict the crack initiation load in through-wall cracked components using tensile specimen test data

Among several other definitions, the crack initiation fracture toughness ( J i) based on critical stretch zone width (SZWc), called J SZWc, is being considered as a geometry independent material property. The problem in SZWc experimental evaluation is in identifying the size of stretch zone on a blu...

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Bibliographic Details
Published in:The International journal of pressure vessels and piping 2010-12, Vol.87 (12), p.737-745
Main Authors: Saxena, Sanjeev, Ramakrishnan, N., Chouhan, J.S.
Format: Article
Language:English
Subjects:
Applied sciences
Crack initiation
CT specimen
Exact sciences and technology
Finite element analysis
Fracture
Fracture mechanics
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
JSZW
Mathematical analysis
Mathematical models
Mechanical engineering. Machine design
Methodology
Physics
Piping
Solid mechanics
Steel design
Steel tanks and pressure vessels
boiler manufacturing
Structural and continuum mechanics
Tensile specimen
Tensile tests
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Summary:Among several other definitions, the crack initiation fracture toughness ( J i) based on critical stretch zone width (SZWc), called J SZWc, is being considered as a geometry independent material property. The problem in SZWc experimental evaluation is in identifying the size of stretch zone on a blunted crack front as this requires a high degree of precision and expertise in measuring the SZW. The present study addresses finite element determination of SZWc value using tensile test data. The role of stress tri-axiality in standard fracture specimen s and the smooth round tensile specimen is also studied. Based on the ASTM-E1820 standard, the present study also showed that fracture specimen thickness greater than the specified size is to be used for numerical prediction of valid SZWc value. The numerically predicted SZWc that leads to J SZWc matches well with experimental values. Using J SZWc, the crack initiation load is also determined in circumferentially through-wall cracked (TWC) elbows and compares well with experimental results. Thus the paper establishes the methodology to predict crack initiation in cracked piping components using numerically obtained valid J SZWc from material’s tensile test data.
ISSN:0308-0161
1879-3541
DOI:10.1016/j.ijpvp.2010.08.014