What is reverse bending?
Reverse curve bending is where a steel section is curved to a radius in one direction and then is curved to a radius in the opposite direction. One example of our reversed curved beam bending projects is the Ratner Athletic Center at the University of Chicago.
What causes metal fatigue?
Metal fatigue occurs when metal parts are weakened due to repeated stresses. There are three stages to metal fatigue: Stage One: After a certain amount of load cycles, micro-cracks begin to form on the metal during the metal fatigue process.
How can you describe metal fatigue?
Metal fatigue, weakened condition induced in metal parts of machines, vehicles, or structures by repeated stresses or loadings, ultimately resulting in fracture under a stress much weaker than that necessary to cause fracture in a single application.
Which steel would you choose for cyclic stress application?
Which steel would you choose for Cyclic stress application? Explanation: Ferritic and martensitic Steels are more notch sensitive. Austenitic Steel shows less notch sensitivity. That’s why it is more fatigue resistant.
What can be height of an extrusion or an intrusion which is responsible for crack initiation in case of fatigue?
Explanation: In case of fatigue, there is movement of dislocation because of which local deformation called extrusions are form in slip bands which are accompanied by intrusions. These extrusion and intrusion have a height ranging from 10-6 cm to 10-7 cm.
What term is used for initial crack formation during fatigue?
The process of fatigue failure itself consists of several distinct processes involving initial cyclic damage (cyclic hardening or softening), formation of an initial ‘fatal’ flaw (crack initiation), macroscopic propagation of this flaw (crack growth), and final catastrophic failure or instability.
What is high cycle fatigue and low cycle fatigue?
The difference between low cycle fatigue (LCF) and high cycle fatigue (HCF) has to do with the deformations. LCF is characterized by repeated plastic deformation (i.e. in each cycle), whereas HCF is characterized by elastic deformation.