isogenic strain - ορισμός. Τι είναι το isogenic strain
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Τι (ποιος) είναι isogenic strain - ορισμός

MATHEMATICAL APPROACH TO THE DESCRIPTION OF THE DEFORMATION OF A SOLID BODY IN WHICH THE DISPLACEMENTS OF THE MATERIAL PARTICLES ARE ASSUMED TO BE MUCH SMALLER THAN ANY RELEVANT DIMENSION OF THE BODY
Strain tensor; Plane strain; Infinitesimal strain; Volumetric strain; Cauchy strain tensor; Infinitesimal strain tensor; Small strain theory; Infinitesimal rotation tensor
  • Spherical coordinates (''r'', ''θ'', ''φ'') as commonly used in ''physics'': radial distance ''r'', polar angle ''θ'' ([[theta]]), and azimuthal angle ''φ'' ([[phi]]). The symbol ''ρ'' ([[rho]]) is often used instead of ''r''.

Strain gauge         
  • digital image correlation]] on a material testing coupon showing moving strain structures called [[Lüders band]]s
  • Geometries of strain gauges
  • An unmounted resistive foil strain gauge
ELECTRONIC COMPONENT
Strain gage; Strain Gauge; Crack gauge; Crack width gauge; Strain gauges; Molecular strain gauge
A strain gauge (also spelled strain gage) is a device used to measure strain on an object. Invented by Edward E.
strain gauge         
  • digital image correlation]] on a material testing coupon showing moving strain structures called [[Lüders band]]s
  • Geometries of strain gauges
  • An unmounted resistive foil strain gauge
ELECTRONIC COMPONENT
Strain gage; Strain Gauge; Crack gauge; Crack width gauge; Strain gauges; Molecular strain gauge
¦ noun a device for indicating the strain of a material or structure at the point of attachment.
Stress–strain curve         
  • The difference between true stress–strain curve and engineering stress–strain curve
  • Stress–strain curve for brittle materials compared to ductile materials
CURVE WHICH REPRESENTS THE DEFORMATION CAUSED BY A FORCE
Yield curve (physics); True stress; Stress-strain relations; Stress-strain curve; Stress and strain; Stress strain curve
In engineering and materials science, a stress–strain curve for a material gives the relationship between stress and strain. It is obtained by gradually applying load to a test coupon and measuring the deformation, from which the stress and strain can be determined (see tensile testing).

Βικιπαίδεια

Infinitesimal strain theory

In continuum mechanics, the infinitesimal strain theory is a mathematical approach to the description of the deformation of a solid body in which the displacements of the material particles are assumed to be much smaller (indeed, infinitesimally smaller) than any relevant dimension of the body; so that its geometry and the constitutive properties of the material (such as density and stiffness) at each point of space can be assumed to be unchanged by the deformation.

With this assumption, the equations of continuum mechanics are considerably simplified. This approach may also be called small deformation theory, small displacement theory, or small displacement-gradient theory. It is contrasted with the finite strain theory where the opposite assumption is made.

The infinitesimal strain theory is commonly adopted in civil and mechanical engineering for the stress analysis of structures built from relatively stiff elastic materials like concrete and steel, since a common goal in the design of such structures is to minimize their deformation under typical loads. However, this approximation demands caution in the case of thin flexible bodies, such as rods, plates, and shells which are susceptible to significant rotations, thus making the results unreliable.