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Prediction of random vibration fatigue damage using isogeometric modelling

Wang Shubiao, Khalij Leila, Troian Renata, Shi Lujie

Computer Assisted Methods in Engineering and Science

2021

Vol. 28, no. 3

193--223

The finite element analysis (FEA) method is indispensable in simulation technology, as itcan help engineers predict results to avoid the cost of experimental testing. However, thefinite element mesh generation process can be time-consuming, and the approximate meshmodel can lead to inaccurate stress results. Improving the accuracy of stress estimationleads to a better assessment of damage or life of mechanical components. In this study, weapplied the isogeometric analysis (IGA) implemented in LS-DYNA software to study twospecimens subjreted to the stationary Gaussian random loads. These geometric modelswere represented by non-uniform rational B-spline (NURBS) to assess the damage andfatigue life in the frequency domain by using Dirlik’s distribution and cumulative damage.A comparison with FEA was conducted to highlight the main differences. Experimentalfatigue tests with an electrodynamic shaker were also carried out to check if the fatiguelives predicted by numerical models are consistent. The study showed that IGA predictssimilar results to FEA with an acceptable relative error and reduced the time for meshgeneration, requiring fewer integration points and mesh elements.