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Strengthening the Substrates of Wood Single Lap Joints Using a Novel Hot-Melt Film Adhesive to Mitigate Delamination.

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Improving Eco-Friendly Polymer Adhesive Joints: Innovative Toughening Strategies for Consistent Performance Under

Shahin Jalali1, Ricardo J C Carbas1,2, Eduardo A S Marques2

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Summary

This study enhances wood adhesive joints using reinforced bio-adhesives, significantly boosting strength and energy absorption. The novel method prevents delamination, making wood joints more resilient for dynamic engineering applications.

Keywords:
bio-jointsdelaminationtoughened jointtransverse strengthwooden joints

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Area of Science:

  • Materials Science
  • Engineering
  • Sustainable Materials

Background:

  • Growing importance of sustainable materials and eco-friendly methods in engineering.
  • Wood adhesive joints offer advantages over traditional methods, including better load distribution and reduced stress concentration.
  • Bio-adhesives are gaining attention for their environmental benefits and mechanical properties.

Purpose of the Study:

  • To enhance the delamination resistance of wooden adhesive joints.
  • To investigate a novel surface reinforcement method using high-toughness resin.
  • To evaluate a hybrid substrate approach combining a tough outer layer and a densified wood core.

Main Methods:

  • Analysis of normal, toughened, and hybrid single-lap joint specimens.
  • Experimental and numerical methods under quasi-static and intermediate loading rates.
  • Bio-adhesive penetration into the wood substrate to create a reinforced surface zone.

Main Results:

  • Toughened joints showed a 2.8-fold increase in strength and up to 4.5 times higher absorbed energy under intermediate-rate conditions.
  • Failure mechanism shifted from delamination to fiber breakage, indicating enhanced substrate strength.
  • Viscoelastic behavior of bio-adhesive influenced joint response to displacement rate changes.

Conclusions:

  • The novel toughening method significantly improves the strength and resilience of wooden adhesive joints.
  • Enhanced joints are more suitable for dynamic applications due to increased load-bearing capacity and resistance to delamination.
  • The study demonstrates a promising approach for developing stronger, more durable sustainable wood composite structures.