What are the three modes of loading in fracture mechanics explain with neat sketch?
Mode I – Opening mode (a tensile stress normal to the plane of the crack), Mode II – Sliding mode (a shear stress acting parallel to the plane of the crack and perpendicular to the crack front), and. Mode III – Tearing mode (a shear stress acting parallel to the plane of the crack and parallel to the crack front).
What is crack front?
The crack front is the forward part of the crack. Abaqus uses the crack front to compute the first contour integral using all of the elements inside the crack front and one layer of elements outside the crack front. Abaqus computes the contour integral at each node along the crack line.
What is stress intensity factor in fracture mechanics?
The stress intensity factor (K) is used in the field of fracture mechanics. It predicts stress intensity near the tip of a crack caused by a remote load or residual stresses.
What term is used for initial crack formation during fatigue?
The initial development of a fatigue crack occurs at localized discontinuities in the metal’s crystal structure. The generation and movement of discontinuities actually strengthens the metal through plastic deformation. This phenomenon is called work hardening.
What is linear elastic fracture mechanics?
Linear elastic fracture mechanics (LEFM) is based on the analysis of cracks in linear elastic materials. It provides a tool for solving most practical problems in engineering mechanics, such as safety and life expectancy estimation of cracked structures and components.
What is crack tip singularity?
Stress singularity in elasticity indicates a point at which the stress is infinite. Therefore, the stress field near the crack tip is recognized as stress singularity.
What are the causes of costophrenic angle blunting?
Costophrenic Angle Blunting Causes Include: Pleural Effusion- Collection of fluid outside lung between lung and chest wall. Costophrenic Angle Blunting is seen more often in individuals with Pleural Effusion.
What does costophrenic angle look like on chest xray?
Costophrenic angle is observed on plain X-ray on right and left side. The angle is observed as a downward indentation between the left or right diaphragm and adjacent chest wall. Under normal circumstances, an extremely small part of each lung touches the costophrenic angle.
What is the characteristic fracture mode for fatigue crack growth?
These models are consistent with the creation of fatigue striations, which are the characteristic fracture mode for fatigue crack growth in ductile materials.
What is the difference between Costo and phrenic word?
Word Costo is used to describe disease related to ribs and phrenic word is used to describe disease close to diaphragm. The acute angle between rib and diaphragm is considered normal when angle is less than 30 degrees and blunt when angle is more than 30 degrees. Angle becomes blunt in patients suffering with pleural effusion.
