FASTENERS AT LOW TEMPERATURES - CHARACTERIZATION AND METHODS FOR DESIGN

被引:0
作者
Stephan, Melanie [1 ]
Weber, Jens O.
Wuttke, Ulrich [1 ]
Berger, Christina [1 ]
机构
[1] Tech Univ Darmstadt, Zentrum Konstruktionswerkstoffe, D-64283 Darmstadt, Germany
来源
PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION 2011, VOL 3 | 2012年
关键词
Bolted Joints; Fasteners; Low Temperature; Tensile Test; Charpy Pendulum Impact Test; Tensile Impact Test; Brittle Fracture Concepts;
D O I
暂无
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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 degrees C, -58 degrees F) as long as a minimum impact energy of 27 J at 253 K (-20 degrees C, -4 degrees 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 degrees C, -94 degrees F) and room temperature 293 K (20 degrees C, 68 degrees 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.
引用
收藏
页码:465 / 473
页数:9
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