Term

Definition
Sigma = F/ Ao; where F is the instantaneous load applied perpendicular to the specimen cross section (N) or pounds force (lbf). Ao is the original crosssectional area before any load is applied (m^(2) or in^(2)) 


Term
Engineering Strain (weird e shape) 

Definition
change in l / lo or li  lo / lo; lo is the original length before any load is applied and li is the instantaneous length. No units. 


Term

Definition
weird r = F / Ao; F is the load or force imposed parallel to the upper and lower faces, each of which has an area of Ao. 


Term

Definition


Term
Modulus of elasticity (Young's modulus) 

Definition
The constant of proportionality E 


Term

Definition
Stress and Strain are proportional; a plot of stress (ordinate) versus strain (abscissa) results in a linear relationship 


Term
Relationship between shear stress and shear strain for elastic deformation 

Definition


Term

Definition
Elastic deformation will continue after the stress application and upon load release some finite time is required for complete recovery. 


Term
Poisson's ratio in terms of lateral and axial strain 

Definition


Term
Relationship among elastic parameters, modulus of elasticity, shear modulus, and Poisson's ratio 

Definition


Term

Definition
For most metallic materials, elastic deformation persists only to strains of about 0.005. As the material is deformed beyond this point, the stress is no longer proportional to strain and permanent and nonrecoverable allowing this to occurs. 


Term

Definition
It is therefore desirable to know the stress level at which plastic deformation begins. 


Term

Definition
For metals that experience this gradual elasticplastic transition, the point of yielding may be determined as the initial departure from linearity of the stressstrain curve. 


Term

Definition
The stress corresponding to the intersection of this line and the stressstrain curve as it bends over in the plastic region. 


Term

Definition
The stress at the maximum on the engineering stressstrain curve. 


Term

Definition
It is a measure of the degree of plastic deformation that has been sustained at fracture. 


Term

Definition
A metal that experiences very little or no plastic deformation upon fracture. 


Term

Definition
The capacity of a material to absorb energy when it is deformed elastically and then upon unloading to have this energy recovered. 


Term

Definition
A mechanical term that may be used in several contexts. This is a property that is indicative of a material's resistance to fracture when a crack is present. 


Term

Definition
Defined as the load F divided by the instantaneous crosssectional area Ai; sigma T = F/Ai 


Term

Definition


Term

Definition
A mechanical property that is the measure of a material's resistance to localized plastic deformation. 

