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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...
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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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Deformation of high density polyethylene by dynamic equal-channel-angular pressing.

Xiangji Wu1, Lin Pu2, Yunfei Xu1

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Dynamic equal-channel-angular pressing (D-ECAP) modifies high-density polyethylene (HDPE) crystallite orientation. This processing technique offers control over polymer structure and is a valuable complement to existing methods.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Mechanical Engineering

Background:

  • High-density polyethylene (HDPE) is a widely used polymer.
  • Controlling crystallite orientation is crucial for tailoring material properties.
  • Existing processing techniques like ECAP have limitations.

Purpose of the Study:

  • To investigate the effect of high strain rate and large shear deformation on HDPE crystallite orientation using D-ECAP.
  • To compare the strain accumulation in D-ECAP versus ECAP.
  • To explore the structural changes and crystallographic c-axis orientations induced by D-ECAP.

Main Methods:

  • Dynamic equal-channel-angular pressing (D-ECAP) of HDPE samples.
  • Processing using two loading routes: route A and route C.
  • Macroscopic strain distribution analysis using grid lines and finite element modeling.

Main Results:

  • D-ECAP processing leads to a decrease in crystalline stem thickness and overall crystallinity.
  • A new monoclinic phase emerges after D-ECAP.
  • Two crystallographic c-axis orientations were observed: parallel to flow direction (FD) or tilted 55° clockwise from FD, with one orientation dominating after specific processing.

Conclusions:

  • D-ECAP effectively influences the structure and crystallite orientation of HDPE.
  • The strain rate effect in D-ECAP impacts shear strain accumulation differently than ECAP.
  • D-ECAP is a viable technique for controlling crystalline polymer structure, complementing ECAP.