Abstract
The present work is based on a previous numerical simulation used for the introduction of a residual stress field in a modified compact tensile specimen. The main objective in that paper was to evaluate the effect that previous history has in crack initiation and to establish the new loading conditions needed to propagate a fracture. The experimental analysis presented in this paper was performed to compare and validate the numerical procedure. Several modified compact tensile specimens from a biocompatible material (AISI 316L) were manufactured to estimate the beneficial effect of a residual stress field. The specimens were separated in four batches; an initial group of uncracked specimens was used to establish an evaluation of the induction of a residual stress field produced by an overload; the remaining specimens were separated into three groups where a crack was introduced in each specimen (1 mm, 5 mm and 10 mm respectively) and the residual stress field caused by the application of an overload was determined. The assessment of all the residual stress fields introduced into the specimens was done by the application of the crack compliance method (CCM). The results obtained have provided useful information on the correlation between the numerical and experimental procedures. Furthermore, data concerning the understanding of diverse factors related to crack initiation are discussed in this paper. Finally, the beneficial aspects of the residual stresses are discussed.
Highlights
One of the most complicated problems that a mechanical engineer or scientific researcher could face is the assessment of crack propagation in components with previous loading history
The validation for the experimental application of the compliance method (CCM) on the determination of induced residual stress fields has been presented in this paper
It has been establish that the CCM can be applied in specimens wider than 10 mm, for example this investigation was applied to material thickness of 23 mm, 28 mm, 32 mm and 33 mm
Summary
One of the most complicated problems that a mechanical engineer or scientific researcher could face is the assessment of crack propagation in components with previous loading history. It is a fact, that residual stresses have been studied as a mechanical procedure to enhance the mechanical resistance of the material after the application of a manufacturing process. In recent years there has been a growing interest in crack arrest problems. The principal inconvenient regarding this kind of investigation, is that most of the work done in this field has been based on the assumption of linear elastic fracture mechanics (LEFM); that is, the state at the crack tip is assumed to be characterized usually by the stress intensity factor [3]. The development of this knowledge is not sufficient to judge whether the linear theory is valid, or, rather, if it provides the
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