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Investigation of fracture behaviour of asymmetric spur gear
Theoretical and Applied Fracture Mechanics ( IF 5.0 ) Pub Date : 2021-04-15 , DOI: 10.1016/j.tafmec.2021.102991
Nandu V Namboothiri , P Marimuthu

As a high power transmission capacity and long durability constitute an essential requirement for mechanical machinery, the mechanical transmission gears need to be modified to improve the performance. The increasing drive side pressure angle is one of the methods for enhancing load-carrying capacity of the spur gear. The fracture characteristics of asymmetric gears need to be investigated to estimate the fatigue life. The location and magnitude of stress intensity factors mainly depend on gear tooth geometry, gear parameters, crack tip location, and applied force. Most of the literature study of fracture analysis carried out for the symmetric gears and the majority of them are two-dimensional analysis. In this study, a parametric analysis carried out for asymmetric spur gears to examine the fracture behaviour under mixed-mode fracture condition and explore the significance of each gear parameters. The maximum bending stress location for each gear pair is determined and the crack is introduced at that region. The stress intensity factor (SIF) for each mode is estimated and the effective stress intensity factor at each node along the face width is determined. In addition, the effect of opening mode, sliding mode and tearing mode on effective stress intensity factor for fillet crack is examined. This analysis inferred that the effect of opening mode fracture is predominant in the effective stress intensity factor irrespective of gear parameters.



中文翻译:

非对称正齿轮断裂行为的研究

由于高动力传递能力和长耐久性是机械设备的基本要求,因此需要对机械传动齿轮进行改进以提高性能。增加驱动侧压力角是增强正齿轮的承载能力的方法之一。需要研究非对称齿轮的断裂特性以估计疲劳寿命。应力强度因子的位置和大小主要取决于齿轮齿的几何形状,齿轮参数,裂纹尖端的位置和作用力。对对称齿轮进行断裂分析的大部分文献研究都是二维分析。在这项研究中,对非对称正齿轮进行了参数分析,以检查混合模式断裂条件下的断裂行为,并探索每个齿轮参数的重要性。确定每个齿轮对的最大弯曲应力位置,并在该区域引入裂纹。估计每种模式的应力强度因子(SIF),并确定沿面宽度的每个节点处的有效应力强度因子。另外,研究了开模,滑动模和撕裂模对圆角裂纹有效应力强度因子的影响。该分析推断,不管齿轮参数如何,在有效应力强度因子中,开模断裂的影响都是主要的。确定每个齿轮对的最大弯曲应力位置,并在该区域引入裂纹。估计每种模式的应力强度因子(SIF),并确定沿面宽度的每个节点处的有效应力强度因子。另外,研究了开模,滑动模和撕裂模对圆角裂纹有效应力强度因子的影响。该分析推断,在有效应力强度因子中,不管齿轮参数如何,开模断裂的影响都是主要的。确定每个齿轮对的最大弯曲应力位置,并在该区域引入裂纹。估计每种模式的应力强度因子(SIF),并确定沿面宽度的每个节点处的有效应力强度因子。另外,研究了开模,滑动模和撕裂模对圆角裂纹有效应力强度因子的影响。该分析推断,不管齿轮参数如何,在有效应力强度因子中,开模断裂的影响都是主要的。研究了圆角裂纹有效应力强度因子的滑动模式和撕裂模式。该分析推断,在有效应力强度因子中,不管齿轮参数如何,开模断裂的影响都是主要的。研究了圆角裂纹有效应力强度因子的滑动模式和撕裂模式。该分析推断,在有效应力强度因子中,不管齿轮参数如何,开模断裂的影响都是主要的。

更新日期:2021-05-03
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