The stiffness of a material measured by the slope of the elastic stress-strain line.
E measures stiffness: the slope of the linear stress-strain curve. Steel ≈ 200 GPa, aluminium ≈ 70 GPa, concrete ≈ 30 GPa, rubber a few MPa. Stiffness differs from strength.
An aluminium beam deflects about three times as much as an identical steel beam.
Young's modulus measures stiffness, which decides how much a part deflects under load and how it vibrates.
The stiffness of a material measured by the slope of the elastic stress-strain line.
Young's modulus measures stiffness, which decides how much a part deflects under load and how it vibrates.
Its atomic bonds resist stretching much more, so a given stress produces a much smaller strain, giving a far higher modulus.
No. Strength and stiffness are separate properties. Some high-strength materials have a modest modulus, and some stiff materials yield early.
Typical applications include choosing a material to limit deflection of a floor beam, comparing steel, aluminium and carbon fibre for a lightweight frame and estimating the stretch of a long steel cable under its own weight.
Study "Hooke's law" first (topic 46 of 106 in Engineering Mechanics). It covers the groundwork this topic builds on.
Material property, geometry independent. High E gives small deflection. E fixed by atomic bonding largely.
An aluminium beam deflects about three times as much as an identical steel beam.
The next topic is "Poisson's ratio", which builds directly on this one.
It is classed as Intermediate in Engineering Mechanics (topic 47 of 106). It is an intermediate topic. Work through the beginner topics in Engineering Mechanics first.
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