NDLI: Fasteners at Low Temperatures: Characterization and Methods for Design

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Stephan, Melanie Jens, O. Weber Wuttke, Ulrich Berger, Christina
Copyright Year	2011
Abstract	Bolted joints are a major part of wind energy plants. Due to climatic conditions, they are often exposed to temperatures far below the freezing point. Together with the multiaxial state of stress, which results from the notch effect of the thread, and possible dynamic overloads during operation, sufficient ductility of the material is needed. The state of the art method to investigate the ductile behavior of fasteners is the Charpy pendulum impact test with a V-notched specimen. According to international standard DIN EN ISO 898-1 [1] respectively ASTM F568M-07 [2], fasteners made of carbon steel and alloy steel with a body centered cubic lattice structure can be used for temperatures down to 223 K (−50°C, −58°F) as long as a minimum impact energy of 27 J at 253 K (−20°C, −4°F) is met. As there are several disadvantages in using this test method for fasteners, a detailed examination of existing test methods and design concepts is necessary to find alternatives to the Charpy pendulum impact test. Extensive quasi-static and dynamic material tests were conducted on fasteners with property classes 5.6, 10.9 and 12.9 in a temperature range between 203 K (−70°C, −94°F) and room temperature 293 K (20°C, 68°F). Both mechanical properties and the influence of different specimen geometries were evaluated. Analytical concepts for the description of the low temperature applicability of different steels were analyzed.
Starting Page	465
Ending Page	473
Page Count	9
File Format	PDF
ISBN	9780791854891
DOI	10.1115/IMECE2011-63570
Volume Number	Volume 3: Design and Manufacturing
Conference Proceedings	ASME 2011 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2011-11-11
Publisher Place	Denver, Colorado, USA
Access Restriction	Subscribed
Subject Keyword	Charpy pendulum impact test Tensile impact test Brittle fracture concepts Tensile test Bolted joints Fasteners Low temperature Design Impact testing Pendulums
Content Type	Text
Resource Type	Article

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