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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

677
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...
677
Thermal Strain01:19

Thermal Strain

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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Responses to Heat and Cold Stress02:45

Responses to Heat and Cold Stress

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Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
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Thermal Stress01:09

Thermal Stress

3.7K
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...
3.7K
Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

2.5K
San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
2.5K
Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

1.6K
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
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Predictive Measurement for Windlass Change in Length and Selected Treatment Outcomes in Chronic Plantar Fasciitis
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Temperature as a predictive tool for plantar triaxial loading.

Metin Yavuz1, Ryan W Brem1, Brian L Davis2

  • 1University of North Texas Health Science Center, Fort Worth, TX, USA.

Journal of Biomechanics
|December 3, 2014
PubMed
Summary
This summary is machine-generated.

Foot temperature increases correlate with shear stress, potentially aiding in predicting diabetic foot ulceration sites. This study explored the link between exercise-induced foot temperature and plantar loading, finding a moderate association.

Keywords:
DiabetesPlantar pressurePlantar shearThermographyUlcer

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Area of Science:

  • Biomechanics
  • Diabetic Foot Research
  • Thermography Applications

Background:

  • Diabetic foot ulcers, linked to neuropathy and plantar stress, can lead to amputations.
  • Plantar pressure alone is inconsistent for predicting ulceration; shear stress is understudied.
  • Plantar temperature is an unvalidated alternative for assessing plantar loading and shear.

Purpose of the Study:

  • To investigate the association between exercise-induced plantar temperature increase and plantar stresses.
  • To determine if foot temperature changes can predict plantar loading locations.
  • To validate plantar temperature as a non-invasive method for assessing plantar triaxial loading.

Main Methods:

  • Thirteen healthy participants walked on a treadmill for 10 minutes at 3.2 km/h.
  • Plantar temperature profiles were captured using thermal imaging before and after exercise.
  • Plantar triaxial stresses were quantified using a custom-built stress plate.

Main Results:

  • A significant correlation (r=0.78) was found between peak shear stress (PSS) and temperature increase.
  • No significant correlation was observed between peak resultant stress (PRS) and temperature increase (r=0.46).
  • Plantar temperature increase predicted PSS and PRS locations in 23% and 39% of subjects, respectively.

Conclusions:

  • A moderate linear relationship exists between triaxial plantar stresses and walking-induced foot temperature increase.
  • Plantar temperature shows potential as an indicator of shear stress but requires further validation.
  • Future research should explore nonlinear models for predicting plantar loading using foot temperature.