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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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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
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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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Investigating Mechanical Behaviours of PDMS Films under Cyclic Loading.

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Polymers
|June 24, 2022
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Summary

Polydimethylsiloxane (PDMS) mechanical properties are crucial for wearable electronics. This study reveals PDMS

Keywords:
cyclic mechanical propertycyclic tensile behaviourhyperelastic material coefficientpolydimethylsiloxane (PDMS) filmstrain-controlled cyclic test

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Area of Science:

  • Materials Science
  • Polymer Physics
  • Mechanical Engineering

Background:

  • Polydimethylsiloxane (PDMS) is a key substrate for wearable electronics due to its fatigue resistance.
  • Cyclic loading can alter PDMS mechanical properties by rearranging polymer chains.
  • Understanding PDMS mechanical behavior under various loading conditions is essential for device reliability.

Purpose of the Study:

  • To investigate the mechanical properties of PDMS films under both monotonic and cyclic loading.
  • To analyze the influence of film thickness and tensile strain magnitude on PDMS mechanical behavior.
  • To identify suitable hyperelastic models for simulating PDMS stress-strain behavior.

Main Methods:

  • Tensile testing of PDMS films under monotonic and cyclic loading conditions.
  • Investigation of varying film thicknesses and tensile strain magnitudes.
  • Evaluation of neo-Hookean, Mooney-Rivlin, third-order Ogden, and Yeoh hyperelastic models.

Main Results:

  • PDMS films exhibit a constant monotonic elastic modulus irrespective of thickness and tensile loading.
  • Cyclic elastic modulus of PDMS varies with experimental parameters.
  • The third-order Ogden model accurately simulates PDMS stress-strain behavior across the entire tensile test range.

Conclusions:

  • PDMS mechanical properties differ significantly between monotonic and cyclic loading.
  • The third-order Ogden model provides reliable coefficients for finite element analysis of PDMS structures.
  • This research enhances the understanding of PDMS fatigue behavior and structural integrity assessment.