期刊
COMPOSITE STRUCTURES
卷 94, 期 2, 页码 664-670出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2011.08.032
关键词
Fatigue resistance; Damage accumulation; Wind turbine blade root; Railway and trailer GRP springs
资金
- Czech Eureka [OE 10017, OE 148, OE 44/2]
- UK Department of Trade and Industry
- [EUREKA E! 1841]
The paper summarises the most important results of selected experimental programmes on static and fatigue strength of heavy loaded components and joints made of glass reinforced plastic (GRP) composites, having been recently performed in fatigue laboratory of the SVUM a.s. research and testing institute. Components like GRP trailer leaf springs, springs for railway freight vehicles are addressed, along with heavy loaded joints like stud connections in rotor blade roots at different loading and environmental conditions. It was confirmed during the different kind of tests that fatigue damage accumulation can be well monitored particularly when there are no defects or imperfections in the material. Then the damage curve usually had the typical three-stages sigmoidal shape. In case of fatigue tests of stud joints, where damage was located into the bonded area inside the specimen, temperature changes were considerably more sensitive than displacement and detailed temperature monitoring indicated weak areas in the full scale model specimens. Sudden break was mostly characteristic for defect material with insufficient wet out or with different bubbles and voids. After a more detailed analysis of fatigue tests, some further links like connections between total fatigue life and initial stiffness or initial temperature increase gradient were indicated. (C) 2011 Elsevier Ltd. All rights reserved.
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