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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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Adhesion along metal-polymer interfaces during plastic deformation.

R van Tijum1, W P Vellinga1, J Th M De Hosson1

  • 1Department of Applied Physics, The Netherlands Institute for Metals Research and Materials Science Center, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.

Journal of Materials Science
|March 16, 2019
PubMed
Summary

Interface roughness in metal-polymer contact significantly impacts adhesion. Roughness evolution during plastic deformation influences interface energy, showing initial decrease, then partial recovery during polymer softening, and a final decrease with hardening.

Keywords:
Cohesive ZoneHurst ExponentInterface EnergyPolymer CoatingShear Band

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Surface Science

Background:

  • Understanding metal-polymer interfaces is crucial for material performance.
  • Plastic deformation of metals induces surface roughness, affecting interfacial properties.
  • Polymer coatings, like Poly-Ethylene Terephthalate (PET), exhibit complex mechanical behavior.

Purpose of the Study:

  • To numerically investigate the influence of evolving interface roughness on adhesion.
  • To analyze the change in interface energy between a deforming metal and a polymer coating.
  • To model the mechanical response of a PET-like polymer and its interaction with a rough metal substrate.

Main Methods:

  • A constitutive law simulating Poly-Ethylene Terephthalate's elastic, yield, softening, and hardening behavior was employed.
  • A mixed-mode (Mode I and II) stress-separation law defined interface energy and length scale.
  • Self-affine surface roughness parameters (Hurst exponent, correlation length, rms amplitude) were tracked during deformation.

Main Results:

  • Interface energy initially decreased until the polymer's yield strain.
  • Partial interface energy recovery was observed during polymer macroscopic softening.
  • Interface energy decreased again at higher strains with polymer macroscopic hardening.

Conclusions:

  • Interface roughness evolution during plastic deformation critically modulates metal-polymer adhesion.
  • The interplay between polymer's constitutive behavior (softening/hardening) and interface roughness dictates energy changes.
  • Model parameters and coating thickness effects on interface energy were explored.