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==Definition==
*1. The [[quality]] or condition of being strong. a. [[Power]] of [[action]] in [[body]] or limbs; ability to exert muscular [[force]]. In 15-18th c. the plural was often used after a plural possessive.
:b. Bodily vigour in general; efficiency of the bodily powers; esp. in contrast with the weakness due to illness, fatigue, age, immaturity, etc. Also collect. pl. for sing.: cf. L. vires.
:c. Power in general, whether [[physical]], [[mental]], or due to the possession of resources; ability for effective action; efficiency, vigour (of mental faculties, etc.).
:d. Capacity for [[moral]] effort or endurance; firmness (of [[mind]], [[character]], [[will]], [[purpose]]); power to resist temptation or fulfil a difficult [[duty]]; fortitude as one of the cardinal virtues. Freq. in phr. strength of character. in one's own strength: in reliance on oneself and not on [[divine]] [[grace]].
:e. Power of contending in [[war]]are; now chiefly, military power derived from numbers, equipment, or resources.
:f. In a fortification, fortified place, etc.: Power of withstanding assault or capture.
:g. In [[things]], material or immaterial: Operative power; capacity for producing effects.
:h. Validity, legal force. to bear strength: to be in [[force]]. to stand in its strength: to remain valid. Obs.
:i. Power to sustain the application of force without breaking or yielding.
:j. Intensity and active force (of [[motion|movement]], wind, fire, a stream, current of electricity, or the like); intensity (of a physical condition, [[colour]], [[sound]], etc.). In Telecommunications also with following numeral, indicating signal strength as shown on a meter. with strength: violently.
:k. Vigour, intensity (of [[feeling]], conviction, etc.). Also, emphasis, positiveness (of refusal).
:l. Intensity of the specific property, or proportionate [[quantity]] of the active ingredient in a substance; potency (of drugs, liquors). Also, in particularized sense, a definite degree of strength.
:m. Of soil: Firmness.
:n. Demonstrative force or weight (of arguments, evidence); amount of evidence for (a case).
:o. [[Energy]] or vigour of literary or artistic conception or execution; forcefulness (of delineation, versification, [[expression]]).
==Description (Materials Science)==
In materials science, the '''strength''' of a [[material]] refers to the material's ability to withstand an applied [[stress]] without failure. Yield strength refers to the point on the engineering stress-strain curve (as opposed to true stress-strain curve) beyond which the material begins deformation that cannot be reversed upon removal of the loading. <u>Ultimate strength</u> refers to the point on the engineering stress-strain curve corresponding to the maximum stress. The applied stress may be tensile, compressive, or shear.
A material's strength is dependent on its micro[[structure]]. The engineering [[process]]es to which a material is subjected can alter this microstructure. The variety of strengthening [[mechanism]]s that alter the strength of a material includes work hardening, solid solution strengthening, precipitation hardening and grain boundary strengthening and can be quantified and qualitatively explained. However, strengthening mechanisms are accompanied by the caveat that some mechanical properties of the material may degenerate in an attempt to make the material stronger. For example, in grain boundary strengthening, although yield strength is maximized with decreasing grain size, ultimately, very small grain sizes make the material brittle.
In general, the yield strength of a [[material]] is an adequate indicator of the material's [[mechanical]] strength. Considered in tandem with the [[fact]] that the yield strength is the [[parameter]] that predicts plastic deformation in the material, one can make informed [[decision]]s on how to increase the strength of a material depending its microstructural properties and the desired end effect.
Strength is considered in terms of compressive strength, tensile strength, and shear strength, namely the limit states of compressive stress, tensile stress and shear stress, respectively. The effects of [[dynamic]] loading is probably the most important [[practical]] part of the strength of materials, especially the problem of [[fatigue]]. Repeated loading often initiates brittle cracks, which grow slowly until failure occurs.
However, the term strength of materials most often refers to various methods of calculating stresses in structural members, such as beams, columns and shafts. The methods that can be employed to predict the response of a structure under loading and its susceptibility to various failure modes may take into account various properties of the materials other than material (yield or ultimate) strength. For example failure in buckling is dependent on material stiffness (Young's Modulus).[http://en.wikipedia.org/wiki/Strength_of_materials]
[[Category: General Reference]]
==Definition==
*1. The [[quality]] or condition of being strong. a. [[Power]] of [[action]] in [[body]] or limbs; ability to exert muscular [[force]]. In 15-18th c. the plural was often used after a plural possessive.
:b. Bodily vigour in general; efficiency of the bodily powers; esp. in contrast with the weakness due to illness, fatigue, age, immaturity, etc. Also collect. pl. for sing.: cf. L. vires.
:c. Power in general, whether [[physical]], [[mental]], or due to the possession of resources; ability for effective action; efficiency, vigour (of mental faculties, etc.).
:d. Capacity for [[moral]] effort or endurance; firmness (of [[mind]], [[character]], [[will]], [[purpose]]); power to resist temptation or fulfil a difficult [[duty]]; fortitude as one of the cardinal virtues. Freq. in phr. strength of character. in one's own strength: in reliance on oneself and not on [[divine]] [[grace]].
:e. Power of contending in [[war]]are; now chiefly, military power derived from numbers, equipment, or resources.
:f. In a fortification, fortified place, etc.: Power of withstanding assault or capture.
:g. In [[things]], material or immaterial: Operative power; capacity for producing effects.
:h. Validity, legal force. to bear strength: to be in [[force]]. to stand in its strength: to remain valid. Obs.
:i. Power to sustain the application of force without breaking or yielding.
:j. Intensity and active force (of [[motion|movement]], wind, fire, a stream, current of electricity, or the like); intensity (of a physical condition, [[colour]], [[sound]], etc.). In Telecommunications also with following numeral, indicating signal strength as shown on a meter. with strength: violently.
:k. Vigour, intensity (of [[feeling]], conviction, etc.). Also, emphasis, positiveness (of refusal).
:l. Intensity of the specific property, or proportionate [[quantity]] of the active ingredient in a substance; potency (of drugs, liquors). Also, in particularized sense, a definite degree of strength.
:m. Of soil: Firmness.
:n. Demonstrative force or weight (of arguments, evidence); amount of evidence for (a case).
:o. [[Energy]] or vigour of literary or artistic conception or execution; forcefulness (of delineation, versification, [[expression]]).
==Description (Materials Science)==
In materials science, the '''strength''' of a [[material]] refers to the material's ability to withstand an applied [[stress]] without failure. Yield strength refers to the point on the engineering stress-strain curve (as opposed to true stress-strain curve) beyond which the material begins deformation that cannot be reversed upon removal of the loading. <u>Ultimate strength</u> refers to the point on the engineering stress-strain curve corresponding to the maximum stress. The applied stress may be tensile, compressive, or shear.
A material's strength is dependent on its micro[[structure]]. The engineering [[process]]es to which a material is subjected can alter this microstructure. The variety of strengthening [[mechanism]]s that alter the strength of a material includes work hardening, solid solution strengthening, precipitation hardening and grain boundary strengthening and can be quantified and qualitatively explained. However, strengthening mechanisms are accompanied by the caveat that some mechanical properties of the material may degenerate in an attempt to make the material stronger. For example, in grain boundary strengthening, although yield strength is maximized with decreasing grain size, ultimately, very small grain sizes make the material brittle.
In general, the yield strength of a [[material]] is an adequate indicator of the material's [[mechanical]] strength. Considered in tandem with the [[fact]] that the yield strength is the [[parameter]] that predicts plastic deformation in the material, one can make informed [[decision]]s on how to increase the strength of a material depending its microstructural properties and the desired end effect.
Strength is considered in terms of compressive strength, tensile strength, and shear strength, namely the limit states of compressive stress, tensile stress and shear stress, respectively. The effects of [[dynamic]] loading is probably the most important [[practical]] part of the strength of materials, especially the problem of [[fatigue]]. Repeated loading often initiates brittle cracks, which grow slowly until failure occurs.
However, the term strength of materials most often refers to various methods of calculating stresses in structural members, such as beams, columns and shafts. The methods that can be employed to predict the response of a structure under loading and its susceptibility to various failure modes may take into account various properties of the materials other than material (yield or ultimate) strength. For example failure in buckling is dependent on material stiffness (Young's Modulus).[http://en.wikipedia.org/wiki/Strength_of_materials]
[[Category: General Reference]]
