What is the difference between strain and deflection

Stresses are either tensile or compressive. Structural materials are chosen by their ability to resist tensile or compressive forces, depending upon the application. Most materials are better at resisting one or the other.

For instance, concrete is strong in compression and relatively weak in tension. Steel is equally strong in both tension and compression. There are two types of forces in structural engineering: tension and compression.

Stress is defined as force per unit area that the force acts upon. Thus, Stresses are either tensile or compressive. Strain is defined as the change in length of a stressed structural element divided by the original length of the unstressed element. While the test is conducted, both the stress and strain are recorded. The maximum stress that the specimen can withstand is called the ultimate strength of that particular material.

From a design stand-point, we are mainly interested in the stress where the material stops behaving elastically. A material behaves elastically when it returns to its original shape when an applied load is no longer applied.

This point is found by plotting stress versus strain during the test and determining the stress at which the plot becomes non-linear. This stress is called the yield stress , s y. The slope of the stress-strain curve in the elastic region is defined as the elastic modulus , E.

Structures should be designed so that any applied load would not cause the stress in the structure to be greater than s y. In a previous post, we looked at the stress-strain curve and its relationship to various aspects of material strength — tensile strength, yield strength, and fracture strength, for example.

When a material is subjected to a load — its own unsupported weight, an external applied load, or both — it experiences stress and strain.

The ratio of stress force per unit area to strain deformation per unit length is referred to as the modulus of elasticity, denoted E. A material that is strong can withstand high loads without permanent deformation.

E is generally taken to be the elastic constant known as Young's modulus which describes the relationship between axial stress and axial strain where Hooke's law still applies i. Nu is Poisson's ratio which is the relationship between axial strain and radial or transverse strain. For more information, please see the related link. Strain is further division of species and different in gentics level with other strain while clone is genticially and morphology similar to parent cell.

Stress is the force that causes deformation of an object. Strain is the deformation caused by stress on the object. Strain is the measure of length change per unit length. Elongation usually refers to strain under load at failure point. A muscle strain is usually caused by some sort of trauma, where tendinitis is usually caused by overuse in general. A sprain is an injury to a ligament. A sprain is an injury to a muscle or tendon.

In bacteriology, and probably in microbiology at large, there is a slight difference, may I say details to the differentiation between these two words. The article title "Strain, clone, and species: Comments on three basic concept of bacteriology" published the Journal of Medical Microbiology in by Dijkshoorn et al illustrate the difference. Strain gage and Extensometer both are same purpose to check the stress and strain in selective test pieces, but traditional they were using strain gage its take the preparation time is high and Extensometer we are check the directly both results are same.

The normal strain is a deformation caused by normal forces such as Tension or Compression that act perpendicular to the cross-sectional area, while the shear strain is a deformation obtained from forces acting parallel or tangential to the cross-sectional area. First of all i guess the right question is difference between strain and deformation.

Actually the strain is deformation in a material over its original length. So strain is a relative quantity while deformation is simply change in length, hence absolute and is new length minus original length. Without getting into all the math, the engineering strain utilizes the initial length of the specimen in the calculation, the true strain utilizes the instantaneous length of the specimen. But these two strains are not the same amount of deformation since as a material is stretched further the change in length is distributed over a longer length for positive values and over a smaller length for larger values.

Consider progressing from the now 1. The next change in length is distributed over 1. True strain is the change in length divided by the instantaneous length integrated from the original length to the instantaneous length.

This resolves to the equation above. Strain aging could be described as " normal wear and tear " or the fatigue that is experienced under normal conditions, whereas Dynamic strain would be an out of the normal range stress condition like a one time over stress condition where the sum of much strain aging is experienced in one " dynamic" occurrence.

Role conflict is when one's functions or duties clash with another person's. Role strain refers to giving one person too much functions or duties.

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