NDLI: On the Design of Contact Member Surface Shape of Bolted Joints to Minimize Clamping Load Loss

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A Comparative Study on Mechanical Behavior of Pipe-Socket Threaded Joints With Taper-Taper Threads and Taper-Parallel Threads Combinations by Finite Element Analysis and Experiments

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On the Design of Contact Member Surface Shape of Bolted Joints to Minimize Clamping Load Loss

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Zhu, Linbo Hou, Yifei Bouzid, Abdel-Hakim Hong, Jun
Copyright Year	2018
Abstract	Metal to metal contact between joint surfaces is widely used in bolted joints to obtain a rigid and a high performance connection. However, a significant amount of clamping load is lost when the joint is subjected to mechanical and thermal loading including creep and fatigue. In practice, to prevent bolt loosening, additional parts such as spring washers, double nut, spring lock washers, Nyloc nut and so on are used. Those methods are costly and influence the stability of the joint and affect its structural integrity. It is well established that a small compression displacement in clamping parts leads to a big clamping load loss in stiff joints. This paper discusses the relationship between connection stiffness and clamping load and presents a method that improves clamping load retention during operation by a careful design of the member contact surface shape. A single bolted joint with two clamping parts is modeled using finite element method (FEM). A method is proposed to obtain a specific stiffness by an optimized geometrical shape of the joint contact surfaces. The result shows that the contact surface shape based on a gradually varying gap can improve the retention of the initial clamping load. Furthermore, a formula of the connection stiffness based on the curve fitting technique is proposed to predict residual clamping load under different external load and loosening.
Sponsorship	Pressure Vessels and Piping Division
File Format	PDF
ISBN	9780791851616
DOI	10.1115/PVP2018-84387
Volume Number	Volume 2: Computer Technology and Bolted Joints
Conference Proceedings	ASME 2018 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2018-07-15
Publisher Place	Prague, Czech Republic
Access Restriction	Subscribed
Subject Keyword	Compression Stability Creep Metals Locks (waterways) Bolted joints Fatigue Finite element methods Stress Displacement Design Stiffness Shapes Springs Curve fitting
Content Type	Text
Resource Type	Article

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