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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Bistable composite helices with thermal effects.

Seán Carey1, Robert Telford1, Vincenzo Oliveri1

  • 1School of Engineering and Bernal Institute, University of Limerick, Limerick, Ireland.

Proceedings. Mathematical, Physical, and Engineering Sciences
|October 16, 2019
PubMed
Summary
This summary is machine-generated.

This study enhances morphing composite structures by incorporating thermal effects into analytical models. This improves design predictability and unlocks new morphing capabilities for aerospace and medical applications.

Keywords:
compositehelixmorphingthermoelastic

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Aerospace Engineering

Background:

  • Morphing technologies enable multi-functionality and reconfigurability in structures.
  • Composite materials are crucial for lightweight, reliable morphing solutions in industries like aerospace and medicine.
  • Existing analytical models for morphing structures often do not account for thermal effects.

Purpose of the Study:

  • To enhance the analytical description of multi-stable composite helical structures by including thermal effects.
  • To improve the accuracy of analytical models for morphing structures.
  • To expand the design space for composite morphing structures.

Main Methods:

  • Development of an analytical model that incorporates thermal effects.
  • Verification of the analytical model using finite-element analysis.
  • Experimental validation of the model's predictions.

Main Results:

  • Accounting for thermal effects significantly improves the predictive accuracy of analytical models compared to experimental data.
  • The inclusion of thermal effects expands the design possibilities to include antisymmetric and non-symmetric flange lay-up sequences.
  • New and beneficial morphing behaviors were identified through the thermal analysis.

Conclusions:

  • Thermal effects are critical for accurate modeling and design of composite morphing structures.
  • The enhanced analytical model provides a more robust tool for designing reconfigurable and multi-functional structures.
  • This research opens avenues for novel applications of morphing composite materials by leveraging thermal-induced behaviors.