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Load spectrum lightening of fatigue tests data for time reduction of design validation
Speedfat
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The goal of this project was to develop procedures to reduce spectrum loadings in order to accelerate fatigue tests for the final validation of structural parts. The project aimed moreover to address the question of how to reduce loading as much as possible without significantly changing the fatigue life. Although this programme was oriented towards high-strength steel and automotive industries, the final results will also be valid for all other fatigue applications. In addressing fatigue design issues, this proposal covered safety and sustainable development issues, taking into account the three following primary considerations. (1) There are theories that describe the material damage calculation based on high-cycle fatigue or low-cycle fatigue. These need to be validated for different spectrum loadings to establish a filtering procedure. (2) Under multi-axial loading conditions, this is more complicated. Modelling is however possible and needs to be experimentally validated. (3) For spot-welds and arc-welds, modelling methods, based on structural stress, must validate — through demonstration — the procedures which will be proposed. The filtering procedures (filtering omission level) was based on material properties with a primary focus on HSS. Depending on the initial loading, the efficiency of the filtering (time reduction) was investigated to be at its optimum value, producing the same degree of damage. This indeed was the main expectation. The scientific works and the proposed procedures gathered in this project could form a strong basis for producing a future European recommendation on efficient filtering for spectrum loading reduction of steel component validation.
Book Details
Authors
European Commission and Directorate General for Research
Series
Research Fund for Coal and Steel
Publishers
Publication year : 2010
License: All rights reserved ©
Times read: 0
