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Reconfigurable Microfluidic Channel with Pin-discretized Sidewalls
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Filling Behavior in Joining Using Pin-like Structures.

Michael Wolf1, Dietmar Drummer1

  • 1Institute of Polymer Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Am Weichselgarten 10, 91058 Erlangen, Germany.

Polymers
|August 12, 2022
PubMed
Summary
This summary is machine-generated.

Investigating novel pin-like joining for multi-material polymers reveals shrinkage significantly impacts bond quality. Applying pressure during filling and cooling is crucial for high-strength joints with shrinkage-intensive materials.

Keywords:
adhesion-incompatiblemulti-materialpin-like structuresvibration welding

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Area of Science:

  • Materials Science
  • Polymer Engineering
  • Manufacturing Processes

Background:

  • Multi-material designs offer resource efficiency but pose joining challenges for conventional methods.
  • Novel joining techniques, like those using pin-like structures, are essential for advancing sustainable manufacturing.
  • Understanding material-specific properties is key to optimizing these innovative joining processes.

Purpose of the Study:

  • To investigate the influence of filling behavior and shrinkage effects on the bond quality of multi-material joints created using pin-like structures.
  • To identify correlations between material shrinkage, process parameters, and the resulting mechanical bond strengths.
  • To optimize the pin-like joining process for enhanced efficiency and material utilization.

Main Methods:

  • Utilizing vibration welding with and without pre-heating for the joining step.
  • Employing injection molding to control structure filling and cooling under elevated pressure.
  • Analyzing the impact of material shrinkage on joint filling degree and mechanical properties.

Main Results:

  • Shrinkage behavior was found to significantly influence the filling degree and overall bond properties of multi-material joints.
  • For materials with high shrinkage, applying pressure during filling and cooling is critical for achieving high mechanical bond strengths.
  • For materials with low shrinkage, pressure applied during the joining step has a negligible effect on bond strength.

Conclusions:

  • The study highlights the critical role of shrinkage management in multi-material pin-like joining.
  • Process optimization, particularly pressure application during filling and cooling, is essential for materials exhibiting significant shrinkage.
  • Tailoring joining strategies based on material shrinkage characteristics is key to achieving robust and high-performance multi-material polymer joints.