Company: TeMeCo
Knowledge - Mechanics - Young's Modulus measurements
What is the Young's modulus?
The Young’s modulus “E” is a mechanical property that measures the tensile or compressive rigidity of a solid material when a force is applied. It quantifies the relationship between tensile/compressive stress σ and axial strain ε in the linear elastic range of a material and is determined using the formula E = σ ε.
Why is the modulus of elasticity important?
As long as the stress-strain curve of a material overlaps with the line of the modulus of elasticity, the deformation of the material remains reversible. A tolerance of 0.2 % is often used for metallic materials. The value Rp0.2% indicates the stress at which the material retains a permanent deformation of 0.2%. Beyond this point, we speak of plastic deformation, which can lead to the material breaking.
This leads us to the question: At what point is the material or a component damaged?
It’s like sitting on a bench that hardly deforms but breaks under load, or on a bench that doesn’t break but deforms a lot without breaking. In the first case, one speaks of a brittle material, in the second case of a ductile material.
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Method
The method for measuring the modulus of elasticity requires the simultaneous measurement of force and strain. Tensile or compression tests are used for this, as it is easy to load a sample with increasing elongation. Universal testing machines are used for this purpose. The force is measured using load cells, which should be matched to the expected force range and accuracy. Measuring the elongation can be very tricky. With soft materials, it may be sufficient to measure the crosshead movement of the testing machine. An extensometer is required for many materials. The range of extensometers is very broad. It is very important to choose the right instrument.
Products
Epsilon – Non-contact extensometers
Epsilon – High temperature extensometer
Epsilon – Rock, concrete and asphalt
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