R strain - translation to Αγγλικά
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R strain - translation to Αγγλικά

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''.

R strain      
‎ ذُرِّيَّةُ R,ذُرِّيَّةٌ خَشِنَة:في المزارع الجرثومية‎
right ventricular strain         
  • Electrocardiogram of a person with pulmonary embolism, showing [[sinus tachycardia]] of approximately 100 beats per minute, large S wave in Lead I, moderate Q wave in Lead III, inverted T wave in Lead III, and inverted T waves in leads V1 and V3.
McConnell's sign; S1Q3T3; S1q3t3; Strain on the right heart; Right ventricular strain; Acute right heart strain; McGinn–White sign; McGinn-White sign; RV strain
‎ إِجْهادٌ بُطَينِيٌّ أَيمَن‎
McGinn-White sign         
  • Electrocardiogram of a person with pulmonary embolism, showing [[sinus tachycardia]] of approximately 100 beats per minute, large S wave in Lead I, moderate Q wave in Lead III, inverted T wave in Lead III, and inverted T waves in leads V1 and V3.
McConnell's sign; S1Q3T3; S1q3t3; Strain on the right heart; Right ventricular strain; Acute right heart strain; McGinn–White sign; McGinn-White sign; RV strain
عَلاَمَةُ ماك غين - وايت (في تخطيط كهربية القلب في الصمة الرئوية)

Ορισμός

strain gauge
¦ noun a device for indicating the strain of a material or structure at the point of attachment.

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.