Corrosion fatigue crack propagation properties under biaxial stresses.

The Effect of Atmospheric Corrosion on Environmental Fatigue Crack Propagation and Its Inhibition

Age-hardenable aluminum alloys used in aerospace structures are susceptible to environment assisted fatigue crack propagation (EFCP). There has been no controlled examination of thin film electrolyte, typically produced by atmospheric exposures, effects on EFCP or inhibition of such cracking. The goal of this research is to understand EFCP and inhibition for atmospheric conditions of important ...

Fatigue crack propagation in microcapsule - toughened epoxy

The addition of liquid-filled urea-formaldehyde (UF) microcapsules to an epoxy matrix leads to significant reduction in fatigue crack growth rate and corresponding increase in fatigue life. Mode-I fatigue crack propagation is measured using a tapered doublecantilever beam (TDCB) specimen for a range of microcapsule concentrations and sizes: 0, 5, 10, and 20% by weight and 50, 180, and 460 lm di...

Stochastic modeling of fatigue crack propagation

This paper presents a stochastic model of fatigue-induced crack propagation in metallic materials. The crack growth rate predicted by the model is guaranteed to be non-negative. The model structure is built upon the underlying principle of Karhunen±Lo eve expansion and does not require solutions of stochastic di€erential equations in either Wiener integral or Itô integral setting. As such this ...

High Temperature Fatigue Crack Propagation in INCONEL718

Prediction of Crack Initiation Direction for Inclined Crack Under Biaxial Loading by Finite Element Method

This paper presents a simple method based on strain energy density criterion to study the crack initiation angle by finite element method under biaxial loading condition. The crack surface relative displacement method is used to eliminate the calculation of the stress intensity factors which are normally required. The analysis is performed using higher order four node quadrilateral element. The...