Improved Usage of High Strength Steel by an Effective FE-based
Design Methodology for Fatigue Loaded Complex Welded Structures
The main goal of the projects is to improve the reliability and consistency and reduce the time and effort required to design complex welded structures that are subject to alternating loads. This has been achieved by developing and verifying integrated FEA and appropriate fatigue resistance data including weld quality.
Standardised analysis and modelling methods as well as procedures and tools for extracting and interpreting FEA results are analysed. The procedures and tools produced are applicable to generic structural components relevant to several industries that use CAD, FEA, and fatigue analysis.
There have been 26 participants in the project from Sweden, Finland, Denmark, Norway and Iceland. 18 companies, 5 university and 3 research organisations are among the partners. Ten of the companies develop and manufacture fatigue loaded complex welded structures as construction machinery, busses, forest machines, robots, cranes and large ship, 4 are consultant companies and 3 are steel suppliers.
FE-Design 2003 was divided into several subprojects such as modelling and analysing of structures or details. Most of the analysed structures are real structures from the participating companies. Different modelling strategies are addressed and some commercial systems are analysed. In some cases detailed analysis of residual stress fields is performed. To verify simplifications sub modelling or similar techniques is used. Based on the calculated results life predictions are performed (based on different prediction methods).
The results are further verified with static measurements and fatigue test on structures were both the life and localisation of cracks are compared. In addition fatigue test of small-scale test pieces manufactured with different weld quality, strength level and thickness are performed. Some of the project results were presented at a large international conference “FATIGUE 2002”, in Stockholm 2-7.6.2002. Since several of the project participants is member of IIW the projects results has bench-marked and regularly discussed at IIW events.
Project duration: 01.01.2001 - 31.12.2003