Lecture23 - Elastic Modulus = Stress Strain Tensile Stress...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Elastic Modulus = Stress Strain Young’s Modulus (Y) Resistance to change in length Δ L Tensile Stress Shear Modulus (G) Resistance to shearing Shear Stress Bulk Modulus (B) Resistance to change in volume V Δ V Bulk Stress
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Young Modulus Strain : Measure of the amount of deformation caused by stress Strain = Δ L / L Elastic Modulus ( Y ) = Tensile Stress Tensile Strain Young Modulus (N/m 2 ) Y Δ L / L = F ext / A •The longer - the more it elongates •The ticker - the less it elongates Δ L Tensile Stress F Stress = F ext / A Stress : External force acting on the object per unit area (A)
Background image of page 2
Shear Modulus Strain : Measure of the amount of deformation caused by stress Strain = Δ x / h Shear Modulus ( S ) = Shear Stress Shear Strain S Δ x / h = F ext / A Stress = F ext / A Stress : Tangential force acting on the object per unit area (area of the face being sheared) Shear Stress Measured in N/ m 2 Δ x = horizontal distance shared face moves h= height of the object
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Bulk Modulus Strain : Measure of the change in volume due to the stress (no change in shape) Strain = Δ V / V Bulk Modulus ( B ) = Volume Stress Volume Strain B Δ V / V = - F / A = - Δ P Stress = F perp / A Stress : Force acting perpendicular on the entire surface of the object 1/B = compressibility Bulk Stress V Δ V F (N/ m 2) An increase in pressure results in a decrease in volume A material with a large bulk modulus is difficult to compress
Background image of page 4
Elastic limit Elastic Modulus = Stress Strain Maximum stress that can be applied to a material before it becomes permanently deformed Plastic region : Does not go back to its original configuration F = K Δ L Elastic force
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Stronger under compression than under tension Example stress Increase in shear strength Kept in tension until concrete cured Compressive stress on the concrete
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/28/2009 for the course PHYSICS 7A/7B taught by Professor All during the Fall '08 term at University of California, Berkeley.

Page1 / 19

Lecture23 - Elastic Modulus = Stress Strain Tensile Stress...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online