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Related Concept Videos

Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

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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.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
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Composite masonry walls combine multiple wythes of the same or different masonry materials to create a unified structure. These walls feature wythes that are bonded together either through mortar-filled collar joints, grouted spaces, or more commonly, with rigid metal ties and reinforcements, with the use of masonry header units being rare. Metal ties are preferred because they effectively minimize water penetration, as these walls primarily absorb moisture and then release it into the...
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Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
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Unsymmetric Loading of Thin-Walled Members: Problem Solving01:07

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The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
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Experimental and Numerical Development on Multi-Material Joining Technology for Sandwich-Structured Composite

Lucian Zweifel1, Igor Zhilyaev1, Christian Brauner1

  • 1Institute of Polymer Engineering, FHNW University of Applied Sciences and Arts Northwestern Switzerland, Klosterzelgstrasse 2, 5210 Windisch, Switzerland.

Materials (Basel, Switzerland)
|October 23, 2021
PubMed
Summary

LiteWWeight® technology creates strong, cost-effective connections for lightweight composite structures using ultrasonic welding. This study validates a model predicting connection strength with 94-99% accuracy.

Keywords:
joiningnumerical analysispolymer compositesprocess modelling and simulationsandwich structuresultrasonic technology

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Manufacturing Processes

Background:

  • Lightweight structures require robust connections without compromising performance.
  • Existing connection methods can be costly or time-consuming.
  • The LiteWWeight® technology offers a novel, rapid joining solution for sandwich composites.

Purpose of the Study:

  • To simulate and experimentally validate the LiteWWeight® ultrasonic joining process.
  • To investigate the interaction between thermoplastic fasteners and composite substrates.
  • To predict and validate connection strength and quality.

Main Methods:

  • Development of a dynamic thermo-mechanical model.
  • Experimental validation using process data, high-speed cameras, and computed tomography.
  • Analysis of fastener-substrate interaction and degree of interlock.

Main Results:

  • The thermo-mechanical model accurately predicted connection quality.
  • Connection strength was consistently above 500 N, suitable for semi-structural applications.
  • Model prediction accuracy for connection strength ranged from 94% to 99% across various setups.

Conclusions:

  • The LiteWWeight® technology provides an efficient and effective method for joining composite sandwich panels.
  • The developed simulation model accurately predicts connection strength, enabling process optimization.
  • This technology facilitates the realization of high-performance, lightweight structures.