# Young's modulus

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Related to Young's modulus: Poisson's ratio

## Young's modulus

[for Thomas YoungYoung, Thomas,
1773–1829, English physicist, physician, and Egyptologist. He established (1799) a medical practice in London and was elected (1811) to the staff of St. George's Hospital there.
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], number representing (in pounds per square inch or dynes per square centimeter) the ratio of stress to strain for a wire or bar of a given substance. According to Hooke's law the strain is proportional to stress, and therefore the ratio of the two is a constant that is commonly used to indicate the elasticityelasticity,
the ability of a body to resist a distorting influence or stress and to return to its original size and shape when the stress is removed. All solids are elastic for small enough deformations or strains, but if the stress exceeds a certain amount known as the elastic
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of the substance. Young's modulus is the elastic modulus for tension, or tensile stress, and is the force per unit cross section of the material divided by the fractional increase in length resulting from the stretching of a standard rod or wire of the material. See strength of materialsstrength of materials,
measurement in engineering of the capacity of metal, wood, concrete, and other materials to withstand stress and strain. Stress is the internal force exerted by one part of an elastic body upon the adjoining part, and strain is the deformation or change in
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.

## Young’s Modulus

the modulus of elasticity that characterizes the ability of a material to resist extension. Young’s modulus E = σ/∊, where σ is the normal stress that occurs in tension and ∊ is the relative elongation that results from the stress. The modulus was introduced by T. Young in 1807.

## Young's modulus

[′yəŋz ‚mäj·ə·ləs]
(mechanics)
The ratio of a simple tension stress applied to a material to the resulting strain parallel to the tension. Also known as modulus of elasticity

## Young's modulus

A constant designated E, the ratio of stress to corresponding strain when the material behaves elastically. Young's modulus is represented by the slope E = ΔS/Δ&epsiv; of the initial straight segment of the stress-strain diagram. More correctly, E is a measure of stiffness, having the same units as stress: pounds per square inch or pascals. When stress and strain are not directly proportional, E may be represented as the slope of the tangent or the slope of the secant connecting two points on the stress-strain curve. The modulus is then designated as tangent modulus or secant modulus at stated values of stress. The modulus of elasticity applying specifically to tension is called Young's modulus. See Elasticity, Stress and strain

## Young’s modulus

In an elastic material which has been subject to strain below its elastic limit, the ratio of the tensile stress to the corresponding tensile strain.
References in periodicals archive ?
Key words: Petrographic characteristics, Uniaxial compressive strength, Ultrasonic wave velocities, Young's modulus, Poisson's Ratio.
In addition to the configuration of the specimen used for vibration tests, the method used to analyze the data obtained from vibration tests influences the accuracy of the Young's modulus and shear modulus measured from solid wood and wood-based materials.
In one of the investigations , the Young's modulus of the cortical bone in bending is determined on 155 bone specimen, and correlated the results with the bone apparent density.
Calculated from static Young's modulus and Poisson's ratio, the static shear modulus of the unsaturated samples ranges from 13.
Owing to the small tested region in nanoindentation, the Young's modulus was obtained by averaging ten indentations.
is on Young's modulus measurements of thin, reflecting films.
The Young's modulus and Poison's ratios are predicted for 55% fiber volume fraction.
Value of young's modulus showed a decrease, in Fig.
It was already stated, in Figure 5, that the locally measured density of a component can be related to the so-called virtual Young's modulus [E.
If a presplit is desired in different rock types the coefficient and explosive load curve can be estimated based on the young's modulus of the rock.
After exploring ANN structures, the architecture of the ANN was designed to include the logsig transfer function in the hidden layer of 105 neurons, the feed-forward backpropagation (FFB) network structure and four output parameters, Young's modulus and tensile strength f the material in the 0[degrees] and 90[degrees] directions (i.

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