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Definition. Generally speaking, curves representing the relationship between stress and strain in any form of deformation can be regarded as stress–strain curves. The stress and strain can be normal, shear, or mixture, and can also can be uniaxial, biaxial, or multiaxial, even change with time.
An object or medium under stress becomes deformed. The quantity that describes this deformation is called strain. Strain is given as a fractional change in either length (under tensile stress) or volume (under bulk stress) or geometry (under shear stress). Therefore, strain is a dimensionless number.
Stress-strain curves are an extremely important graphical measure of a material’s mechanical properties, and all students of Mechanics of Materials will encounter them often. However, they are not without some subtlety, especially in the case of ductile materials that can undergo sub- stantial geometrical change during testing.
G = stress / strain = τ / γ = (F p / A) / (s / d) (5) where . G = Shear Modulus of Elasticity - or Modulus of Rigidity (N/m 2) (lb/in 2, psi) τ = shear stress ((Pa) N/m 2, psi) γ = unit less measure of shear strain . F p = force parallel to the faces which they act. A = area (m 2, in 2) s = displacement of the faces (m, in)
Learn the concepts and units of stress and strain, and how they describe the deformation of materials under different types of forces. Find out the elastic moduli for various materials and how they relate to the linear limit of stress and strain.
1 de jun. de 2020 · Learn how to define stress and strain as intrinsic properties of materials, and how to measure them in a tensile test. Explore the different regimes of the stress-strain curve and what they reveal about a material's behavior.
Learn how to measure the elasticity of materials using stress and strain, the restoring force and the change in length. Watch a video and see questions and answers on this topic.
