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The aim of the present work was to obtain an optimum stop hole shape that gives maximum fatigue crack initiation life by using finite element program.
In order to optimize the geometric designs of crenellation patterns for the maximum fatigue crack retardation, we apply an approach coupling genetic algorithm with FEM simulations to examine the vast candidate designs.
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It was found that the copolymer grafted SiO2 nanoparticles enhanced the ductility (maximum 60% improvement), fracture toughness (maximum 300% improvement) and fatigue crack growth resistance of the epoxy matrix while maintaining the modulus at loadings of less than 2 vol% of silica core.
Attention has been focused on small fatigue crack growth at maximum stresses beyond the 0.2% proof stress of the material.
The technique is based on combining the eXtended Finite Element Method (XFEM) with two fatigue crack growth criteria, namely Maximum Tangential Stress (MTS) and minimum shear stress range.
The strain energy dissipation approach is used to show that the resistance to fatigue crack growth is related to the maximum applied load.
However, the arrest or retardation of fatigue crack propagation often occurred even under constant maximum stress.
But the manner of the fatigue crack initiation and propagation depends on the maximum cyclic stress applied.
The decrease in the fatigue strength at high-strength level can be explained by fracture mechanics and attributed to the transition of fatigue cracking sites from surface to the inner inclusions, resulting in the maximum fatigue strength σmaxw at an appropriate tensile strength level.
The results indicated that the maximum strain amplitude at the contact interface was an important parameter for fretting fatigue crack initiation.
The maximum energy release rate criterion, i.e., Gmax criterion, is extended to study the fatigue crack growth characteristics of mixed mode cracks.
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