Chapter 18
Stress and Strain - Axial Loading
Deformazione normale sotto carico assiale
A rod subjected to a load undergoes elongation. A load-deformation diagram can represent the elongation but cannot predict deformation in different rods.
...
Diagramma sforzo-deformazione
Consider a cylindrical specimen placed in a system to measure its tensile strength.
Two gauge marks are inscribed on the central portion of the specimen. ...
Diagramma sforzo-deformazione - Materiali duttili
When a specimen is subjected to loading the length first increases linearly at a slow rate, resulting in an initial straight line with a steep slope on ...
Diagramma sforzo-deformazione - Materiali fragili
Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation ...
Vero stress e vera deformazione
Engineering stress is the ratio of the load and the undeformed original cross-sectional area. Engineering stress approximates strain which represents the ...
Legge di Hooke
Hooke's law states that stress applied to a material is directly proportional to the strain it experiences within the elastic limit. For ductile ...
Comportamento plastico
Materials under stress due to tensile loading exhibit elastic and linear behavior until the yield point. Removing the load at the yield point, stress and ...
Fatica
Fatigue occurs when the materials, under repeated loads for thousands or millions of cycles, rupture at a stress level much lower than the material's ...
Deformazione dell'asta sotto carichi multipli
The deformation of a rod with different materials and cross-sections is computed by dividing it into parts, each characterized by individual parameters.
...
Risoluzione dei problemi staticamente indeterminata
Consider two cylindrical rods, one of steel and another of brass, joined at point B and restrained by rigid supports at points A and C.
Determine the ...
Deformazione termica
A homogeneous rod with a uniform cross-section, resting freely on a horizontal surface, expands when heated.
The expansion is proportional to the ...
Deformazione dipendente dalla temperatura
Consider a non-homogenous rod made of steel and brass, restrained at both ends and subjected to a temperature change.
The stress and load on the rod are ...
Rapporto di Poisson
When a slender bar is subjected to an axial load, the bar material undergoes axial strain, causing it to deform in the axial direction.
Simultaneously, ...
Legge di Hooke generalizzata
The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an ...
Modulo di massa
The bulk modulus is a scientific term used to describe a material's resistance to uniform compression. It is the proportionality constant that links a ...
Deformazione di taglio
In a cubic element with a general state of stress, the shearing stresses can deform a cube into an oblique parallelepiped without affecting normal ...
Relazione tra il rapporto di Poisson, il modulo di elasticità e il modulo di rigidità
A slender bar subjected to an axial load undergoes deformation in the axial and transverse directions. The deformation affects the cubic elements within ...
Principio di Saint-Venant
Consider a member with plates on both ends. When loads are applied centrally on the plates, they move towards each other without rotating, causing the ...
Concentrazioni di stress
Stress concentration refers to the amplification of stress in a structural member near points of discontinuity, such as holes or abrupt changes in ...
Tensioni residue
When a rod is stretched beyond its yield point, it permanently deforms and doesn't regain its original length.
The stresses created during loading are ...
Personale delle biblioteche
Copyright © 2025 MyJoVE Corporation. Tutti i diritti riservati