# 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.
], 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
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
.

## 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 ?
This decline in Young's Modulus appears to be more rapid for the shallower depths, compared to that for the deeper indentation at higher loads.
The relationship between the dynamic Young's modulus and the rate of occurrence of CF in lumber was slightly positive for both Japanese cedar and Japanese cypress.
Figure 3 shows that, up to 5 wt.%, iPP/MTalc A and iPP/MTalc B composites present similar Young's modulus values, indicating that, up to 5 wt.% of talc in iPP matrix, the filler characteristics did not affect significantly the stiffness of the composites.
Then, the average displacement in y-axis was used to compute Young's modulus by using (3).
Yield strength, Young's modulus, elongation at break, and impact strength of PP/MCC nanoclay composites are presented in Figures 12-15 as a function of nanoclay weight fraction.
To further analyze the probe indentation process and to calculate Young's modulus E, it is necessary to pass from the empirical function I{Z (Figures 2(b) and 2(d)) to F(Z) and F (h), where F is the force acting on the sample and h is the probe (tip) indentation depth, or membrane bending.
Similarly, 8% Young's modulus was significantly different among the groups (F = 35.55, P = 0.00).
The relationships between [E.sub.B] and Young's modulus for PLA and PLA/PBAT are shown in Figure 12.
FATIGUE STRENGTH OF THE MATERIALS WITH SHRINKAGES BASED ON DENSITY AND VIRTUAL YOUNG'S MODULUS
The vessel wall was considered as elastic with a density of 1075 kg/[m.sup.3], a Poisson's ratio of 0.45, and an initial Young's modulus (E) of 3 MPa.
It had been proved that cells had mechanical character to respond to physical and chemical stimulus from outside and make autoregulation, such as Young's modulus and adhesion ability [9].
Those authors have shown that small decrements from coarse-grained values observed in Young's modulus are caused primarily by the slight amount of porosity in the samples.

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