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Related Concept Videos

Plastic Behavior01:21

Plastic Behavior

177
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
177

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In Situ Punch-Shear Testing of Polymers.

David Munoz-Paniagua1, Ahmed Hammami2, Hadi Nazaripoor2

  • 1Department of Mechanical Engineering, University of Alberta, 9211-116 St, Edmonton, AB T6G 1H9, Canada.

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Summary
This summary is machine-generated.

Conventional material testing can mislead. This study reveals that sample preparation and fluid reversibility significantly impact polymer mechanical properties, especially after aging. Standardizing methods is crucial for accurate in situ assessments.

Keywords:
agingin situ propertiespunch–shear testingreversibilitysaturationtensile testingthermoplastic polymers

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Area of Science:

  • Materials Science
  • Polymer Science
  • Mechanical Engineering

Background:

  • Traditional material aging and testing methods may yield inaccurate results for polymers where fluid absorption is reversible, particularly at higher temperatures.
  • In situ testing offers a more accurate assessment of polymer properties under service conditions.
  • Previous work established correlations for Polyethylene of Raised Temperature (PERT) using an in situ punch-shear device.

Purpose of the Study:

  • To evaluate the influence of sample preparation on mechanical property measurements in thermoplastic polymers.
  • To compare tensile and shear property correlations across different polymer grades before fluid exposure.
  • To determine the reversibility of mechanical properties after aging in deionized water at elevated temperatures.

Main Methods:

  • Utilized an in situ punch-shear device to measure shear properties of various thermoplastic polymers under simulated service conditions.
  • Compared tensile (ASTM D638) and shear (ASTM D732) properties before and after aging in deionized water at 95 °C.
  • Investigated the effect of different sample preparation techniques on measured properties.

Main Results:

  • Sample preparation methods significantly influence the correlation between tensile and shear properties, necessitating standardization for reliable comparisons.
  • Distinct correlations between tensile and shear properties were observed for different polymer families.
  • Standard tensile testing after a saturation-dehydration cycle resulted in overestimated mechanical properties.

Conclusions:

  • Accurate in situ mechanical property assessment of polymers requires standardized sample preparation methods.
  • Polymer type influences the relationship between tensile and shear properties, especially under fluid exposure.
  • Conventional post-aging tensile tests can provide misleadingly optimistic mechanical property data due to reversible fluid ingress.