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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

191
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
191
Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

271
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
271
Residual Stresses in Bending01:18

Residual Stresses in Bending

253
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
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Thermal Stress01:09

Thermal Stress

2.6K
If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

233
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
233
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

326
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
326

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Related Experiment Video

Updated: Sep 11, 2025

Fabrication of Compressed Hosiery and Measurement of its Pressure Characteristic Exerted on the Lower Limbs
08:39

Fabrication of Compressed Hosiery and Measurement of its Pressure Characteristic Exerted on the Lower Limbs

Published on: May 27, 2020

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[Stiffness in compression therapy].

Dennis Braß1, Markus Stücker2

  • 1Klinik für Dermatologie, Venerologie und Allergologie, Venenzentrum der dermatologischen und gefäßchirurgischen Kliniken, Katholisches Klinikum Bochum gGmbH, Gudrunstr. 56, 47791, Bochum, Deutschland. dennis.brass@klinikum-bochum.de.

Dermatologie (Heidelberg, Germany)
|August 18, 2025
PubMed
Summary

Compression device stiffness, a key factor in therapeutic effectiveness, influences the massage effect on the lower extremities during movement. Understanding stiffness aids in selecting optimal compression garments for patients.

Keywords:
Chronic venous insufficiencyCompression pressureCompression stockingMassage effectVenous hemodynamics

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Physical Therapy

Context:

  • Medical compression devices' therapeutic effects depend on both resting pressure and dynamic material properties during movement.
  • The stiffness of compression materials significantly impacts the massage effect on the lower extremities.

Purpose:

  • To review and highlight the various aspects of compression device stiffness.
  • To increase awareness of stiffness as a therapeutically relevant factor in compression therapy.

Summary:

  • Stiffness, defined as the increase in compression pressure under load, is a crucial, yet often overlooked, property of compression materials.
  • This property, measurable in vitro and in vivo, influences the dynamic performance of compression stockings.

Impact:

  • Stiffness is an independent predictor of compression therapy effectiveness, guiding clinical selection of optimal garments.
  • Clear manufacturer definition of stiffness in product information is needed to bridge current market gaps.