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# What is the Saint-Venant equation?

## What is the Saint-Venant equation?

A.1 Derivation of the Saint-Venant Equations In the sequel, m(x,t) denotes the mass by unit length of the channel and it is defined as m(x,t) = ρA(x,t).

### What is Saint-Venant theory?

Saint-Venant’s Principle simply states that the stress measured at any point on an axially loaded cross section is uniform given that the measured location is far enough away from the point of load application or any discontinuity in the member’s cross section.

What is Saint-Venant’s principle of stress concentration?

This principle states that: The stresses and strains in a body at points that are sufficiently remote from points of application of load depends only on the static resultant of the loads and not on the distribution of loads. Point loads on a surface give rise to a stress concentration near the point of application.

Was Saint-Venant a saint?

Although his full surname was Barré de Saint-Venant in mathematical literature other than French he is known as Saint-Venant….

Adhémar Jean Claude Barré de Saint-Venant
Died 6 January 1886 (aged 88) Saint-Ouen, Loir-et-Cher, France

## Which theory is used for ductile materials?

The distortion-energy theory, also called the von Mises theory, is best for ductile, even materials (whose compressive and tensile strengths are approximately the same) and whose shear strengths are smaller than their tensile strengths.

### What is von Mises theory?

The Von Mises failure theory indicates that A material will fail if the Von Mises stress or effective stress of that material under load is equal or greater than the yield limit of the same material under a simple uniaxial tension test.

What is the maximum stress concentration factor?

A stress concentration factor is the ratio of the highest stress (smax)) to a reference stress (s) of the gross cross-section. As the radius of curvature approaches zero, the maximum stress approaches infinity. Note that the stress concentration factor is a function of the geometry of a crack, and not of its size.

What is stress and strain?

Stress is the force applied to a material, divided by the material’s cross-sectional area. Strain is the deformation or displacement of material that results from an applied stress.

## Why is Saint Venant’s Principle important?

You can find various formulations of this principle in most structural mechanics textbooks, but its exact meaning is not obvious. Saint-Venant’s principle tells us that the exact distribution of a load is not important far away from the loaded region, as long as the resultants of the load are correct.

### What is Saint Venant’s principle in physics?

Saint-Venant’s principle. The Saint-Venant’s principle allows elasticians to replace complicated stress distributions or weak boundary conditions with ones that are easier to solve, as long as that boundary is geometrically short.

What is de Saint-Venant’s principle?

Saint-Venant’s principle, named after Adhémar Jean Claude Barré de Saint-Venant, a French elasticity theorist, may be expressed as follows: the difference between the effects of two different but statically equivalent loads becomes very small at sufficiently large distances from load.

What is the resultant force of Saint-Venant’s principle?

Due to the symmetries, this load has a zero-resultant force, as well as zero moment around all axes. The height of the cross section is 100 mm, so if the standard form of Saint-Venant’s principle is applicable, then the stresses should be small at a distance of approximately 100 mm from the end section.

## How does Saint-Venant’s principle affect the stress distribution?

Because of Saint-Venant’s principle, the stress field is redistributed to a pure bending state at some distance from the loaded edge, just as we expect. This, however, is not the target of the current discussion. Rather, we investigate the difference between the stress distribution above, and what we get with a number of coarse meshes.