Department of Mechanical Engineering, Universidad de Ibagué, Ibagué, Colombia.
Research Group in Multidisciplinary Optimal Design, Departamento de Ingeniería Mecánica y Mecatrónica, Universidad Nacional de Colombia, Bogota, Colombia.
PLoS One. 2019 Jun 27;14(6):e0218973. doi: 10.1371/journal.pone.0218973. eCollection 2019.
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.
本文研究了采用断裂力学和有限元模拟软件（Ansys APDL、Franc3D）对接焊缝的轴向疲劳引起的裂纹行为，这些焊缝由 ASTM A36 钢制成。计算模型最初是使用 CAD 软件定义几何模型。模拟了焊缝增强 2 毫米和 3 毫米的试样。随后，选择了网格的单元类型、包含材料力学性能和载荷条件的信息。通过使用 Franc3D 软件，分析了裂纹扩展现象，并确定了其生长参数。这样，就可以计算裂纹前沿的应力强度因子（SIF）的大小。结果表明，由于几何应力的集中效应，焊缝趾处的应力与焊缝增强的尺寸成比例地最大化。此外，还观察到从 Paris 定律得到的扩展率对于研究的焊缝增强具有相似的行为；后者是因为存在短裂纹。
