Abstract
This article addresses the study of crack behavior elicited on axial fatigue in specimens joined by butt weld made of steel ASTM A36 by using fracture mechanics and simulation software of finite elements (Ansys APDL, Franc3D). The computational model was initially to define the geometry model by using CAD software. Specimens with Weld Reinforcement of 2 mm and 3mm were simulated. Subsequently, the type of element for the mesh, the information inclusion concerning material mechanical properties and load conditions were selected. By using Franc3D software, the crack propagation phenomenon is analyzed, and its growth parameters have been established. In this way, it is possible to calculate the magnitude of stress intensity factor (SIF) along the crack front. It is concluded that the stress located in the weld toe is maximized proportionately to the size of the weld reinforcement due to the concentration effect of geometric stress. In addition, it is observed that the propagation rate obtained from Paris law has a similar behavior for the studied weld reinforcements; the latter as there were short cracks.
Highlights
IntroductionMost of these joints are found in elements subjected to cyclical loads, the incidence of flaws such as cracks are inevitable
The integrity of welded joints has always been a concern in the engineering field
Most of these joints are found in elements subjected to cyclical loads, the incidence of flaws such as cracks are inevitable. These cracks emerge because of different factors among which changes in microstructures in steels are highlighted, inclusions that can generate stress concentration or operation conditions. This phenomenon behavior is studied by Fracture Mechanics, which is defined as the study of crack propagation in an elastic material through determination of critical conditions for which their growth is produced [1]
Summary
Most of these joints are found in elements subjected to cyclical loads, the incidence of flaws such as cracks are inevitable These cracks emerge because of different factors among which changes in microstructures in steels are highlighted, inclusions that can generate stress concentration or operation conditions. This phenomenon behavior is studied by Fracture Mechanics, which is defined as the study of crack propagation in an elastic material through determination of critical conditions (for instance, magnitude and type of load and defect size) for which their growth is produced [1].
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