Simulating fatigue damage on planar mechanisms considering wear in revolute joints with clearance

IF 4.5 1区 工程技术 Q1 ENGINEERING, MECHANICAL Mechanism and Machine Theory Pub Date : 2024-10-17 DOI:10.1016/j.mechmachtheory.2024.105805
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Abstract

Clearances and wear are present in almost all mechanisms. Their presence leads to degradation of the dynamic behavior of the mechanisms, involving the appearance of vibrations, noise, high forces at the joints, and an increasing fatigue damage.
To simulate this problem, a flexible multibody model is proposed to efficiently determine the stresses involved, thus avoiding the high computational costs associated with the finite element method. The model considers the mechanical interactions and material degradation processes that affect the stress state, providing a more accurate estimation of fatigue damage. In this work, a methodology is proposed for estimating fatigue damage in mechanisms with clearance joints without the need of simulating all the cycles actually performed.
The proposed methodology is applied to a planar slider-crank mechanism in which the fatigue undergone by the connecting rod is considered. Results show that clearances strongly affect the fatigue damage of the links. Furthermore, the effect of wear changes the linear behaviour of fatigue damage with respect to the number of cycles, generally producing a higher damage, and changing the critical damage zones in some cases.
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模拟平面机构的疲劳损伤,考虑有间隙的旋转接头的磨损问题
间隙和磨损几乎存在于所有机构中。为了模拟这一问题,我们提出了一种灵活的多体模型,以有效确定所涉及的应力,从而避免与有限元法相关的高计算成本。该模型考虑了影响应力状态的机械相互作用和材料降解过程,能更准确地估计疲劳损伤。在这项工作中,提出了一种估算带间隙接头机构疲劳损伤的方法,而无需模拟实际执行的所有循环。结果表明,间隙对连杆的疲劳损伤有很大影响。此外,磨损的影响会改变疲劳损伤与循环次数的线性关系,通常会产生更高的损伤,并在某些情况下改变临界损伤区。
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来源期刊
Mechanism and Machine Theory
Mechanism and Machine Theory 工程技术-工程:机械
CiteScore
9.90
自引率
23.10%
发文量
450
审稿时长
20 days
期刊介绍: Mechanism and Machine Theory provides a medium of communication between engineers and scientists engaged in research and development within the fields of knowledge embraced by IFToMM, the International Federation for the Promotion of Mechanism and Machine Science, therefore affiliated with IFToMM as its official research journal. The main topics are: Design Theory and Methodology; Haptics and Human-Machine-Interfaces; Robotics, Mechatronics and Micro-Machines; Mechanisms, Mechanical Transmissions and Machines; Kinematics, Dynamics, and Control of Mechanical Systems; Applications to Bioengineering and Molecular Chemistry
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