Abstract
Standardized tests may not always achieve all their analytical objectives. Particularly to structural integrity, where a reproduction of the practical occurrences of the industry is desired, new techniques are being developed. Therefore, this work aims at evaluating fracture toughness in tensile armour through four measurement methodologies (standard, video, laser and stretch zone (SZ)) to obtain crack tip opening displacement (CTOD), and compares their responses by ANOVA and Duncanâs tests. The findings showed equivalence between the standard and other approaches, thus allowing distinct methods for fracture toughness evaluation.
Highlights
Methodologies for determination of critical or initial crack size are used to offer reliable data for structural integrity projects
The current study aims at evaluating different crack tip opening displacement (CTOD) techniques for fracture toughness in a tensile armour wire
To determine the materials’ mechanical properties, which are used to calculate the CTOD through ASTM E1820 standard, three subsize specimens were machined in the longitudinal direction of the wire
Summary
Methodologies for determination of critical or initial crack size are used to offer reliable data for structural integrity projects In this context, a standard technique enables a comparison of the methods adopted worldwide. Indentations are performed on one lateral surface of the specimen, and a micro-hardness durometer is used to indicate the fixation position of the clip-gage at the beginning of the test [1,4] The advantages of this method imply that the measurements are performed directly at the crack tip, without the need for further calculations or mathematical modelling. The method allows the application of any specimen geometry or structure that contains a crack Both R-curves and fracture toughness values can be obtained concerning critical and initiation stages of crack growth [5]
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