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Related Concept Videos

Thermal Stress01:09

Thermal Stress

2.5K
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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Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

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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...
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Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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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...
184
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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Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

266
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
266
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

320
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.
320

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High-pressure, High-temperature Deformation Experiment Using the New Generation Griggs-type Apparatus
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The Thermo-Mechanical Response of GeTe under Compression.

Gilad Mordechai Guttmann1,2, Shmuel Samuha2,3, Reuven Gertner2

  • 1Department of Materials Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 8410501, Israel.

Materials (Basel, Switzerland)
|September 9, 2022
PubMed
Summary

Thermoelectric generators (TEGs) face limited use due to poor understanding of material properties. This study reveals how temperature and compression affect GeTe alloys, showing a transition from brittle to ductile behavior crucial for advancing TEG technology.

Keywords:
EBSDGeTecompressioncrystallographygeometrically necessary dislocationsmechanical properties

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Energy Conversion

Background:

  • Thermoelectric generators (TEGs) convert heat to electricity but have low technical readiness levels (TRL).
  • Limited understanding of mechanical and thermo-mechanical properties hinders TEG material development.
  • GeTe-based alloys are efficient p-type thermoelectric materials but lack characterization of temperature-dependent mechanical behavior.

Purpose of the Study:

  • To investigate the combined effects of temperature and mechanical compression on GeTe.
  • To explore the influence of these conditions on dislocation activity and micro-texture.
  • To understand the mechanical property transitions in GeTe for improved TEG applications.

Main Methods:

  • Utilized novel quantitative crystallographic methods.
  • Statistically analyzed dislocation activity under varying conditions.
  • Examined micro-texture modifications induced by testing.

Main Results:

  • Compression and temperature cause twin boundary dissolution, increasing dislocation mobility.
  • A brittle-to-ductile transition was observed at approximately 0.45 homologous temperature.
  • These findings provide new insights into the thermo-mechanical behavior of GeTe.

Conclusions:

  • Understanding thermo-mechanical properties is critical for advancing TEG technology.
  • GeTe exhibits a significant mechanical transition under combined stress and temperature.
  • This research paves the way for optimizing GeTe alloys in practical TEG applications.