A fracture mechanics analysis of a crack in a variable thickness plate having a fillet (thintothick type)
Abstract
A 3D finiteelement analysis is employed to analyze cracktip stressintensity factor F in plates of variable thickness with fillets. The analysis is complemented by the investigation of crackgrowth behavior near and at the thickness interface by means of fatigue testing on these types of specimens cut from an aluminum plate. The correction factor for the stressintensity factor is based on the variables for the dimensionless fillet ratio, the width ratio, the thickness ratio, and the dimensionless crack length. The crackpropagation characteristics are similar to those of a crack in a plate of uniform thickness when the crack tip is located far enough from the thickness interfaces. The fatiguecrack propagation rate varies indirectly with the width ratio and the thickness ratio. Both F and the crackpropagation rate increase as the crack tip approaches the thickness interface when the fillet ratio is large compared to the thickness ratio.
 Publication:

Engineering Fracture Mechanics
 Pub Date:
 May 1992
 Bibcode:
 1992EnFM...42..117Y
 Keywords:

 Crack Tips;
 Fracture Mechanics;
 Stress Intensity Factors;
 Thick Plates;
 Thin Plates;
 Variable Geometry Structures;
 Crack Opening Displacement;
 Finite Element Method;
 Loading Rate;
 Tensile Stress;
 Structural Mechanics