Term
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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 cross-sectional area before any load is applied (m^(2) or in^(2)) |
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Term
| Engineering Strain (weird e shape) |
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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. |
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Term
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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. |
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Term
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Definition
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Term
| Modulus of elasticity (Young's modulus) |
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Definition
| The constant of proportionality E |
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Term
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Definition
| Stress and Strain are proportional; a plot of stress (ordinate) versus strain (abscissa) results in a linear relationship |
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Term
| Relationship between shear stress and shear strain for elastic deformation |
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Definition
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Term
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Definition
| Elastic deformation will continue after the stress application and upon load release some finite time is required for complete recovery. |
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Term
| Poisson's ratio in terms of lateral and axial strain |
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Definition
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Term
| Relationship among elastic parameters, modulus of elasticity, shear modulus, and Poisson's ratio |
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Definition
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Term
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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. |
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Term
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Definition
| It is therefore desirable to know the stress level at which plastic deformation begins. |
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Term
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Definition
| For metals that experience this gradual elastic-plastic transition, the point of yielding may be determined as the initial departure from linearity of the stress-strain curve. |
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Term
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Definition
| The stress corresponding to the intersection of this line and the stress-strain curve as it bends over in the plastic region. |
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Term
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Definition
| The stress at the maximum on the engineering stress-strain curve. |
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Term
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Definition
| It is a measure of the degree of plastic deformation that has been sustained at fracture. |
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Term
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Definition
| A metal that experiences very little or no plastic deformation upon fracture. |
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Term
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Definition
| The capacity of a material to absorb energy when it is deformed elastically and then upon unloading to have this energy recovered. |
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Term
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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. |
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Term
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Definition
| Defined as the load F divided by the instantaneous cross-sectional area Ai; sigma T = F/Ai |
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Term
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Definition
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Term
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Definition
| A mechanical property that is the measure of a material's resistance to localized plastic deformation. |
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