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Related Concept Videos

Thermal expansion and Thermal stress: Problem Solving01:27

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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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Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
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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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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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Fatigue01:21

Fatigue

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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Thin-Walled Hollow Shafts

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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
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Knowledge Based Cloud FE Simulation of Sheet Metal Forming Processes
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Dynamic Thermal Response of Multiple Interface Cracks between a Half-Plane and a Coating Layer under General

Mahsa Nourazar1, Weilin Yang1, Zengtao Chen1

  • 1Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.

Materials (Basel, Switzerland)
|June 19, 2024
PubMed
Summary

This study analyzes thermal stress in coated materials with cracks under transient heat. It quantifies how crack properties and heat conditions affect thermal stress intensity factors for improved material design.

Keywords:
dislocation techniqueinterface cracksmultiple-crack problemsnon-Fourier heat conductionsingular integral equationsthermal loading

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Area of Science:

  • Solid Mechanics
  • Heat Transfer
  • Materials Science

Background:

  • Interface cracks in coated materials pose risks under thermal loads.
  • Understanding transient thermal behavior is crucial for high-temperature applications.
  • Hyperbolic heat conduction offers a more accurate model for rapid thermal changes.

Purpose of the Study:

  • To investigate the thermal behavior of multiple interface cracks in a coated half-plane under transient thermal loading.
  • To develop a method for calculating temperature gradient intensity factors (TGIFs) for these cracks.
  • To analyze the influence of material properties and crack geometry on TGIFs.

Main Methods:

  • Modeling cracks as arrays of thermal dislocations.
  • Employing Fourier and Laplace transformations for dislocation density calculation.
  • Formulating and solving a singular integral equation for crack analysis.
  • Utilizing hyperbolic heat conduction theory for temperature distribution.

Main Results:

  • Successfully estimated TGIFs for interface cracks under transient thermal conditions.
  • Quantified the impact of relaxation time, loading parameters, and crack dimensions on TGIFs.
  • Demonstrated the effectiveness of the dislocation-based approach.

Conclusions:

  • The developed methodology accurately predicts thermal stress behavior in cracked coatings.
  • Results provide critical data for fracture analysis in high-temperature structural components.
  • Findings aid in the selection and design of thermal coating materials to mitigate thermal damage.