Abstract
The objective of this study is to evaluate the potential of light alloy mechanical part use in automobile industry by studying their fatigue life using various parameters such as effect of suspension dynamic, excitation type, geometry and mechanical part weight. The studied part is the lower suspension arm made from 7075-T6 aluminium alloy. The strain density energy approach enables us to compare two same order tensor: the multiaxial and uniaxial cases. The random displacement excitation is obtained analytically from the power spectral density PSD. The force excitation is obtained by a simple normalisation of spectrum displacement. To avoid the use of Newton-Raphson method during the partial fatigue life calculation step in all mesh elements, a Matlab interface to identify the critical elements is developed. The strain energy density (SENER) signal of the critical element is corrected to remove anomalies by WAFO Matlab interface algorithm. Rainflow cycles are extracted using Markov formulation in order to calculate the number of signal repetitions to failure, which is calculated from Miner law.
Highlights
Weight reduction improves the slip angle between tires and the road, reaction to turns and the stability of the vehicle, but it makes driving more effective and safe over long distances and yields lower gasoline consumption [1] to [3]
Elmarakbi et al [7] studied the validity of multiaxial criterion of fatigue failure based on strain energy density equivalent to uniaxial case
They equalized energy density of multiaxial case obtained from finite element commercial software
Summary
Weight reduction improves the slip angle between tires and the road, reaction to turns and the stability of the vehicle, but it makes driving more effective and safe over long distances and yields lower gasoline consumption [1] to [3]. Elmarakbi et al [7] studied the validity of multiaxial criterion of fatigue failure based on strain energy density equivalent to uniaxial case. They performed three-dimensional finite element analysis on SAE notch axis, which is used as a test component to evaluate the criterion of multiaxial damage caused by fatigue. Instead of part endurance prediction models that were based on Paris law, De-Andrés et al [9] used element cohesive law In this approach, the creation of new surfaces is the final result of a process of gradual loss of elasticity as separation increases
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