PSI - Issue 19

Sara Eliasson et al. / Procedia Structural Integrity 19 (2019) 81–89 Sara Eliasson / Structural Integrity Procedia 116 (2019) 000 – 000

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testing rigs, equipment and alignment precision of the specimen. The final choice of parameters for the testing set up of the UD CFRP material in this study with provided lab equipment is presented in Figure 10b.

Figure 10: (a) Proposed procedure for setting up a testing approach for fatigue testing of UD CFRP, (b) resulting procedure with defined parameters for fatigue testing procedure in this study.

7. Concluding remarks

This study has been focusing on the development of a procedure for fatigue testing of UD CFRP composite materials. Based on this study it can be concluded that; • The choice of tab configuration is important to achieve fatigue failure in the gauge length of the CFRP material. The parameters that highly affect the strength in the tab area is the adhesive type and the temperature increase. Other parameters such as choice of tapering angle, and tab material is sometimes not always consequent considering theory and actual results from fatigue testing. • It was possible to achieve failure in the tab length of a UD CFRP material where the characteristic failure of “sudden death” occurred for fatigue test specimens. • A procedure for fatigue testing of UD CFRP materials has been developed and is currently successfully implemented in the further work of the test program. Acknowledgements The authors would like to acknowledge Sweden’s Innovation Agency Vinnova (Grant Number 2016-05195) and Scania CV AB for financial support.