Difference Between Shear Stress and Tensile Stress

Main Difference – Shear Stress vs. Tensile Stress

Stress is a quantity that refers to how much deforming force is applied per unit area of an object. Shear and tensile stress refer to different types of stress where the forces are applied on an object in a different way. The main difference between shear stress and tensile stress is that tensile stress refers to cases where a deforming force is applied at right angles to a surface, whereas shear stress refers to cases where a deforming force is applied parallel to a surface.

What is Tensile Stress

Tensile stress refers to cases when a deforming force, acting perpendicular to the surface of the object pull on the object, attempting to elongate it. In this sense, tensile stress is a type of normal stress, which is the term that refers to stresses created by forces perpendicular to an object’s surface. (The other type of normal stress is compressive stress, where a force acting perpendicular to a surface push in on the surface, attempting to shorten it. The difference between tension and compression is described in this article).

Difference Between Shear Stress and Tensile Stress - Tensile_Stress

Tensile stress causing an object to elongate

If the force perpendicular to the surface is given by F and the area of the surface is A, then tensile stress (\sigma) is given by:

\sigma =\frac{F}{A}

Tensile strain (\varepsilon) refers to the change in length  (\Delta x) as a fraction of the original length (x_0):

\varepsilon=\frac{\Delta x}{x_0}

A quantity called Young modulus (E) describes how relatively difficult it is to stretch a given material. This quantity is defined as:


What is Shear Stress

Shear stress refers to cases where the deforming force is parallel to a surface. If the opposite surface is held stationary, then the deformation looks like the one in the figure shown below:

Difference Between Shear Stress and Tensile Stress - Shear_stress

Shear stress from a force parallel to the surface.

The shear stress \tau is again defined as the ratio of the force to the area:


The definition for tensile stress and shear stress are similar; the difference is in the directions of forces.

For the case on the shown on the diagram, the top face of the object gets displaced relative to the bottom face of the object. Shear strain is defined as the ratio of relative displacement between the surfaces to the separation between the surfaces. For instance, in the above diagram, the shear strain is given by:

\mathrm{shear\:strain}=\frac{\Delta x}{l}=\mathrm{tan}\:\left( \Theta\right).

The shear modulus is a quantity that describes how difficult if is for a material to be deformed by applying a shear stress. The shear modulus for a material is defined as:


When you cut a piece of paper with a pair of scissors, you are giving a shear stress to the paper. One side of the scissors attempt to pull the paper in one direction, the other side of the scissors attempt to pull the paper in the other direction.

Difference Between Shear Stress and Tensile Stress - Cutting_Paper

Scissors cut papers by applying a shear stress

Difference Between Shear Stress and Tensile Stress

Direction of Forces

Forces causing tensile stress are at right angles to a surface.

Forces causing shear stress act parallel to a surface.

Deformation of the Object

Tensile stress causes objects to elongate.

Shear stress causes one surface of an object to displace with respect to the surface opposite to it.

Relative Strengths

Solid materials deform more readily under shear stress than under tensile stress.

Image Courtesy:

“The principle of shear is visualized. The specification are choosen to fit in the German Article.” by User:c.lingg (Own work) [Public Domain], via

“IMG_5303” by Abigail Batchelder (Own work) [], via 

About the Author: Nipun

Related pages

short story novella novelrationalism and empiricism differenceschromatids vs chromosomesdefine apparent magnitudedifference between dna and rna nucleotidesdifference between starch and glycogenwhat is the difference between bacon and hamheteronyms examplemetallic or nonmetallic mineralswhat are introns and exonscpap vs bpapdifference between cross pollination and self pollinationbiannual biennialexamples of allomorphs in englishzygote fetusexample of tyndall effect in chemistryhow to tell the meter of a poemthermoset materials listpnp npn transistorwhat is a agranulocytepolyunsaturated lipidsconverge lensred grapefruit vs pink grapefruitfour demonstrative adjectivestribute to grandfather quotesformula for ethanoic acidwhat is the difference between autosomes and sexchromosomesdifference between quinoa and couscousanimals cold bloodeddifference between anabolism and catabolism metabolismpst and est differencewhat is the difference between bipolar and borderlinedifference between manic depression and bipolardefine anabolism and catabolismwhat is jargonspositive & normative economicsdefine sex chromosomedefinition of internal respirationdifference between benzene and phenylmodulus of elasticity in shearmeaning of tension in physicsdifference between rock and oredifference between climatology and meteorologyworking principle of hydrometerdefine inertia physicsepinephrine definition biologydifference between spaghetti and vermicellifertilization definition plantsdawn to dusk meaningsynapsis occurs in prophasechemical symbol for nitratec3cyclena3co no2 6parchment icing recipedifference between goose and duckcrystalloid and colloid fluidsdifference between food poisoning and flucomedy of manners playsdegree of polymerisationanthropology and sociology definitiondifferent between phonetic and phonologymastiff bullmastiff mixconsonance effectdifference between anime and cartoonsaristocracy greek definitionsister chromatids and homologous chromosomesbewildered meanatom and molecule definitionwhat is free market capitalism definitiondifference between flirting and friendlyprecious stones vs semi precious stonesbandwidth vs throughputgst claim at sydney airportwhat is a monocot seedtheme of hansel and gretel