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Related Concept Videos

Plastic Behavior01:21

Plastic Behavior

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 reloaded.
Plastic Deformations01:19

Plastic Deformations

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 original...
Plastic Deformations01:14

Plastic Deformations

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...
Residual Stresses01:26

Residual Stresses

Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
Plasticity00:58

Plasticity

Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

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...

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Updated: Jun 12, 2026

Rapid and Low-cost Prototyping of Medical Devices Using 3D Printed Molds for Liquid Injection Molding
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Absorbable plate strength loss during molding.

Tiffany N S Ballard1, Kevin J Kelly, Victor Zaydfudim

  • 1Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA.

The Journal of Craniofacial Surgery
|May 21, 2010
PubMed
Summary
This summary is machine-generated.

Extended submersion of bioabsorbable cranial plates in molding baths significantly weakens them. Overmolding compromises plate strength and stiffness, risking clinical complications in cranial vault remodeling procedures.

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Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Materials Engineering

Background:

  • Bioabsorbable plating systems are crucial for cranial vault reconstruction.
  • Plate failure necessitates urgent reoperation, prompting investigation into causative factors.

Purpose of the Study:

  • To investigate the impact of prolonged submersion in molding baths on the structural integrity of bioabsorbable poly-D/L-lactic acid plates.
  • To determine if extended hydrolysis compromises plate strength and stiffness.

Main Methods:

  • Tested poly-D/L-lactic acid plates after varying submersion times using cantilever beam and pure tension loading.
  • Analyzed strength and stiffness changes with Student t tests and linear regression.
  • Utilized finite element analysis for computer modeling of plate behavior.

Main Results:

  • Extended submersion caused visible color changes and significant strength loss.
  • After 5 minutes, cantilever load capacity decreased by 30% (P < 0.001).
  • Elastic modulus dropped by 16% (P = 0.027) after 5 minutes, worsening with longer submersion.

Conclusions:

  • Prolonged submersion of bioabsorbable plates during molding leads to substantial loss of mechanical strength and stiffness.
  • Computer modeling predicts clinically relevant increases in plate deviation under normal loads.
  • Caution against overmolding is advised to maintain the structural integrity of bioabsorbable plates.