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Plastic Deformations

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...

Plastic Deformations

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...

Temperature Dependent Deformation

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...

Deformations in a Symmetric Member in Bending

Deformations in a Symmetric Member in Bending

When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...

Aging

Aging

Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...

Deformation of Member under Multiple Loadings

Deformation of Member under Multiple Loadings

When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...

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Related Experiment Video

Updated: Feb 15, 2026

Development of a Direct Pulp-capping Model for the Evaluation of Pulpal Wound Healing and Reparative Dentin Formation in Mice

Development of a Direct Pulp-capping Model for the Evaluation of Pulpal Wound Healing and Reparative Dentin Formation in Mice

Published on: January 12, 2017

Deformation behaviour of aged coronal dentin.

Carolina Montoya¹, Dwayne Arola^2,3, Edgar Alexander Ossa¹

¹School of Engineering, Universidad Eafit, Medellín, Colombia.

|January 26, 2018

Summary

Aging reduces dentin

Keywords:

aged dentin deformation behaviour spherical indentation

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Last Updated: Feb 15, 2026

Development of a Direct Pulp-capping Model for the Evaluation of Pulpal Wound Healing and Reparative Dentin Formation in Mice

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Published on: January 12, 2017

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Area of Science:

Biomaterials science
Dental research
Tissue engineering

Background:

Dentin aging alters tubule characteristics and chemical makeup.
Age-related changes in dentin's hierarchical structure and composition are not fully understood.
Time-dependent deformation of aged dentin requires further investigation.

Purpose of the Study:

To investigate age-related changes in coronal dentin's time-dependent deformation.
To correlate these changes with alterations in dentin's chemical composition.

Main Methods:

Spherical indentation analysis of aged coronal dentin across different regions.
Modeling time-dependent deformation using a microstructure and chemical composition-based approach.
Comparison with a model developed for young dentin.

Main Results:

Aged dentin exhibits a power-law viscous deformation response, distinct from young dentin.
A decrease in the stress exponent was observed in aged dentin.
Collagen cross-linking is a potential explanation for the observed deformation behavior.

Conclusions:

Aged dentin demonstrates reduced deformation capacity.
Mineral dissolution and reprecipitation within dentinal tubules may contribute to this reduced ability.
Understanding these changes is crucial for dental applications and material development.