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Related Concept Videos

Fatigue01:21

Fatigue

290
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
290
Circular Shafts - Elastoplastic Materials01:24

Circular Shafts - Elastoplastic Materials

227
The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
As torque on the...
227
Residual Stresses in Bending01:18

Residual Stresses in Bending

322
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...
322
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

370
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.
370
Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

201
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.
As the bending moment...
201
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

322
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
322

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Fabrication Process of Silicone-based Dielectric Elastomer Actuators
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Electromechanical coupling in elastomers: a correlation between electrostatic potential and fatigue failure.

Yan A Santos da Campo1, Dylan Mehler2, Ezequiel Lorenzett2

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Researchers discovered that electromechanical coupling in rubber materials can predict fatigue failure. This electrical signal change in rubber alerts to impending rupture, offering real-time, non-contact monitoring for material safety and energy harvesting.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Polymer Physics

Background:

  • Electromechanical coupling in elastomers exhibits periodic electrification synchronized with stretching.
  • Distinct electrostatic potential patterns accompany this electrification.
  • Understanding these phenomena is crucial for material durability assessment.

Purpose of the Study:

  • To investigate electromechanical coupling in silicone and natural rubber over extended periods.
  • To determine if electrical signals can predict rubber fatigue failure.
  • To explore the potential for energy harvesting from this coupling.

Main Methods:

  • Monitoring electrification of silicone and natural rubber using a Kelvin electrode.
  • Recording electric potential changes during tensile testing until rupture.
  • Analyzing electrical signal patterns and electrostatic potential maps.

Main Results:

  • Rubber electrification follows quasi-sinusoidal patterns until near-rupture, then becomes complex.
  • Electrical signals exhibit chaotic attractors approximately 50 seconds before rubber rupture.
  • Electrostatic potential maps reveal electrification at rupture sites, indicating an electrostatic contribution to failure.

Conclusions:

  • Mechanical-to-electrical transduction in rubber provides a nearly one-minute warning of fatigue failure.
  • Electromechanical coupling in elastomers offers a non-contact, real-time method for predicting rubber fatigue.
  • This phenomenon also presents opportunities for environmental energy harvesting.