NDLI: An Accurate Method of Evaluating Relaxation in Bolted Flanged Connections

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Bouzid, A. Chaaban, A.
Copyright Year	1997
Abstract	Bolted flanged joint assemblies may begin to leak some time following a successful hydrostatic test. One of the reasons is that the gasket experiences a drop in its initial compressive stress due to creep, thermal dilatation, and thermal degradation. The need to pay attention to the relaxation behavior of bolted joints for high-temperature applications is recognized by the ASME Code, but no specific guidelines are given to help engineers, neither at the design nor maintenance levels. This paper deals with the basic analytical tools that have been used to develop a computer program “SuperFlange” that can be used to make accurate predictions of the relaxation of bolted flanged joints, and hence be able to provide a reasonable leakage assessment over time. A simplified analytical method of relaxation analysis will also be presented. These proposed methods are supported by test results obtained on a real bolted joint fixture and by FE modeling. A strong emphasis will be put on flanged joint rigidity, which is one of the major controlling parameters of relaxation besides the material properties involved.
Starting Page	10
Ending Page	17
Page Count	8
File Format	PDF
ISSN	00949930
e-ISSN	15288978
Journal	Journal of Pressure Vessel Technology
Volume Number	119
Issue Number	1
DOI	10.1115/1.2842254
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	1997-02-01
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ASME Standards Bolted joints Compressive stress Computer software Creep Design Drops Engineers Equipment, tools and products Flange connections Gaskets High temperature Hydrostatic testing Jigs and fixtures Leakage Maintenance Materials properties Modeling Relaxation (Physics) Stiffness
Content Type	Text
Resource Type	Article
Subject	Safety, Risk, Reliability and Quality Mechanical Engineering Mechanics of Materials

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