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Related Concept Videos

Plastic Deformations01:19

Plastic Deformations

291
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...
291
Plastic Deformations01:14

Plastic Deformations

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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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Plastic Behavior01:21

Plastic Behavior

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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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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

419
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.
419
Residual Stresses in Bending01:18

Residual Stresses in Bending

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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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Environmentally-controlled Microtensile Testing of Mechanically-adaptive Polymer Nanocomposites for ex vivo Characterization
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A predictive micromechanically-based model for damage and permanent deformations in copolymer sutures.

F Trentadue1, D De Tommasi1, G Puglisi1

  • 1Dipartimento di Scienze dell'Ingegneria Civile e dell'Architettura, Politecnico di Bari, Via Re David 200, 70125, Bari, Italy.

Journal of the Mechanical Behavior of Biomedical Materials
|January 11, 2021
PubMed
Summary

This study presents a micromechanically-based model for biodegradable copolymer sutures, accurately predicting material behavior under cyclic loading, including damage and residual stretches.

Keywords:
Biodegradable copolymersCyclic uniaxial testDamagePermanent setSutures threadsWorm Like Chain

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Area of Science:

  • Biomaterials Science
  • Polymer Mechanics
  • Statistical Mechanics

Background:

  • Biodegradable copolymer sutures are crucial in surgery, but their mechanical behavior under cyclic loading, including damage and residual stretches, is not fully understood.
  • Accurate modeling is essential for predicting suture performance and ensuring patient safety.

Purpose of the Study:

  • To develop a micromechanically-based model for biodegradable copolymer suture threads.
  • To incorporate the effects of residual stretches and material damage into the model.
  • To validate the model's predictive capabilities using experimental data.

Main Methods:

  • A novel Worm Like Chain free energy formulation was developed based on statistical mechanics.
  • The macroscopic material response was derived using the affinity hypothesis.
  • The model was parameterized using uniaxial tensile tests.
  • Cyclic loading tests were performed on Monocryl® sutures for validation.

Main Results:

  • The proposed model accurately captures the history dependence of suture behavior.
  • The model demonstrates high accuracy in predicting damage accumulation and permanent deformations.
  • A small set of parameters allows for effective model fitting via simple uniaxial tests.

Conclusions:

  • The micromechanically-based model provides a physically interpretable framework for analyzing biodegradable copolymer sutures.
  • The model effectively predicts complex mechanical responses, including damage and permanent deformations, under cyclic loading.
  • This approach enhances the understanding and design of biodegradable suture materials.