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Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
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Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy
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Excellent Temperature-Control Based on Reversible Thermochromic Materials for Light-Driven Phase Change Materials

Caixia Ren1, Fangfang Liu2, Malik Muhammad Umair3

  • 1State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China. 13127037258@163.com.

Molecules (Basel, Switzerland)
|April 27, 2019
PubMed
Summary

This study introduces novel thermochromic phase change materials (TC-PCMs) that control temperature by adjusting light absorption. These materials offer stable thermal energy storage with self-regulating properties.

Keywords:
phase change materialsphoto-thermal conversiontemperature controlthermochromic compound

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Area of Science:

  • Materials Science
  • Energy Storage
  • Photothermal Conversion

Background:

  • Light-driven phase change materials (PCMs) convert visible light to thermal energy but can overheat.
  • High equilibrium temperatures limit the practical application of conventional PCMs.

Purpose of the Study:

  • To develop a novel light-driven phase change material system with intrinsic temperature-control properties.
  • To investigate the photo-thermal conversion performance and thermal stability of these new materials.

Main Methods:

  • Thermochromic phase change materials (TC-PCMs) were synthesized by incorporating 2-anilino-6-dibutylamino-3-methylfluoran (ODB-2) and bisphenol A (BPA) into 1-hexadecanol (1-HD) in varying ratios.
  • Photo-thermal conversion was tested under solar radiation (0.09 W/cm²) and xenon lamp (0.14 W/cm²) irradiation.
  • The thermal stability and reversibility of the TC-PCMs were evaluated over 20 cycles.

Main Results:

  • The synthesized TC-PCMs exhibited controlled equilibrium temperatures due to modulated light absorbance.
  • A specific formulation, TC-PCM₁₈₀ (1:2:180 ratio of ODB-2:BPA:1-HD), stabilized at approximately 54 °C.
  • The TC-PCMs demonstrated excellent reversibility and repeatability over 20 irradiation and cooling cycles.

Conclusions:

  • The developed TC-PCMs effectively mitigate overheating issues associated with conventional light-driven PCMs.
  • These materials offer a promising solution for stable and controllable solar thermal energy storage.
  • The temperature-regulating capability enhances the safety and applicability of PCMs in various thermal management systems.