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Related Concept Videos

Plastic Deformations01:19

Plastic Deformations

439
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...
439
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...
412
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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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...
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Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

482
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...
482
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

453
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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Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

877
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
877

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Compressive deformation and failure of trabecular structures in a turtle shell.

Edward Ampaw1, Tunji Adetayo Owoseni2, Fen Du3

  • 1Department of Materials Science and Engineering, African University of Science and Technology, Nigeria; Department of Mechanical Engineering, Koforidua Technical University, Koforidua, Ghana.

Acta Biomaterialia
|July 17, 2019
PubMed
Summary

Turtle shells possess remarkable mechanical strength due to their hierarchical bone structures. This study reveals how these structures absorb energy under compression, offering insights for designing robust, bioinspired materials.

Keywords:
Compressive deformationFailureFoam structureTrabecular boneTurtle shell

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Area of Science:

  • Biomaterials Science
  • Mechanical Engineering
  • Structural Biology

Background:

  • Turtle shells exhibit complex hierarchical microstructures composed of cortical and trabecular bones.
  • These structures confer unique mechanical properties, particularly under compressive loads.
  • Understanding these properties is crucial for bioinspired engineering applications.

Purpose of the Study:

  • To investigate the mechanical response and deformation mechanisms of Kinixys erosa turtle shell under compression.
  • To elucidate the contributions of microstructural features to the shell's overall strength and energy absorption.
  • To develop predictive models for bioinspired design.

Main Methods:

  • Compression testing of turtle shell specimens.
  • Micro-computed tomography (microCT) imaging for microstructural analysis.
  • Development of finite element models and analytical foam structure models.

Main Results:

  • Identified micro-strut bending and stress concentrations as key contributors to fractural mechanisms in trabecular bone.
  • Demonstrated that turtle shell structures function as sandwich structures, concentrating deformation and stress in trabecular bone for energy absorption.
  • Validated a four-strut model for predicting deformation characteristics and strength of trabecular bone segments.

Conclusions:

  • Turtle shell microstructures provide a robust model for deformation-resistant bioinspired designs.
  • The study highlights the potential of mimicking turtle shell mechanics for creating advanced materials.
  • The findings offer guidance for designing sandwich porous structures with tunable mechanical properties.