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(Teknoloji) shear stress

the component of stress that causes parallel layers of a material to move relative to each other in their own planes

Shear stress is a stress state where the stress is parallel or tangential to a face of the material, as opposed to normal stress when the stress is perpendicular to the face

frictional force overcome by sliding one layer of fluid along another, as in any fluid flow

A stress in which the top and bottom of a material are pushed in opposite horizontal directions

Stress caused by forces operating parallel to each other but in opposite directions

Result from forces which tend to cause one portion of a body to move with respect to another in a direction parallel to their plane of contact

the shearing force divided by the area It is always a maximum at the outside of the flow channel As it is force-related, it depends on the viscosity of the material, which in turn depends on the material and molding conditions The maximum allowable stress level is usually taken as 1% of the tensile strength of the material High shear stress is unimportant at gates, and in sprues and runners

Where normal stress is perpendicular to the designated plane, shear stress is parallel to the plane

frictional force overcome in sliding one “layer” of fluid along another, as in any fluid flow The shear stress of a petroleum oil or other Newtonian fluid at a given temperature varies directly with shear rate (velocity) The ratio between shear stress and shear rate is constant; this ratio is termed viscosity The higher the viscosity of a Newtonian fluid, the greater the shear stress as a function of rate of shear In a non-Newtonian fluid--such as a grease or a polymer-containing oil (e g multi-grade oil)--shear stress is not proportional to the rate of shear A non-Newtonian fluid may be said to have an apparent viscosity, a viscosity that holds only for the shear rate (and temperature) at which the viscosity is determined See Brookfield viscosity

A stress applied tangential to a surface

A tangential force divided by the area (FORCE/AREA) on which it is applied The shear stress is equal to the viscosity multiplied by the shear rate (measured in units of pressure i e MPa or psi) At the die lips under usual production conditions the shear stress may reach values of 0 2 MPa or more The usually accepted value for the onset of sharkskin in capillaries is 0 14 MPa With additives the critical shear stress value might be pushed up to 0 5 MPa

the tangential force per unit area of sheared fluid which is associated with the shear through molecular or turbulent exchange across the flow

Shear Stress is defined as the shear force per unit area applied to a section of the test piece It differs from the stress applied in Young's Modulus, in that it has a twisting effect on the sample under test Shear Stress is measured in units of N m-²

The stress component parallel to a given surface, such as a fault plane, that results from forces applied parallel to the surface or from reinote forces transmitted through the surrounding rock If you lean against the edge of the door where the latch is, you are applying shear stress to the door

An applied force per unit area needed to produce deformation in a fluid

Shear stress is the result of the force that is generated in a melt to overcome its resistance to a particular flow situation Shear stress is the product of a material and shear rate

Stress resulting when two forces act on a body in opposite directions in parallel adjacent planes

the shear force per unit of cross-sectional area; also referred to as diagonal tensile stress

Shear stress in a flowing liquid is the force exerted as one layer moves past another

Frictional force overcome in sliding one "layer" of fluid along another, as in any fluid flow The shear stress of a petroleum oil or other Newtonian fluid at a given temperature varies directly with shear rate (velocity) The ratio between shear stress and shear rate is constant; this ratio is termed viscosity of a Newtonian fluid, the greater the shear stress as a function of rate of shear In a non-Newtonian fluid - such as a grease or a polymer-containing oil (e g multi-grade oil) - shear stress is not proportional to the rate of shear A non-Newtonian fluid may be said to have an apparent viscosity, a viscosity that holds only for the shear rate (and temperature) at which the viscosity is determined

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