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Related Concept Videos

Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
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Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

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The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
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Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

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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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Plastic Deformations01:19

Plastic Deformations

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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...
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Plastic Deformations01:14

Plastic Deformations

246
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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Principal Stresses in a Beam01:11

Principal Stresses in a Beam

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In prismatic beams subject to arbitrary transverse loading, It is essential to analyze the interaction between shear forces and bending moments in order to understand stress distribution and ensure structural integrity. The highest normal or bending stress occurs at the outer fibers of the beam, decreasing linearly to zero at the neutral axis. In contrast, shear stress peaks at the neutral axis and diminishes toward the outer surfaces.
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Structural Design and Manufacturing of a Cruiser Class Solar Vehicle
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Material Design for Optimal Postbuckling Behaviour of Composite Shells.

Domenico Magisano1, Francesco Liguori1, Antonio Madeo1

  • 1Dipartimento di Ingegneria Informatica, Modellistica, Elettronica e Sistemistica, University of Calabria, 87030 Rende, Italy.

Materials (Basel, Switzerland)
|April 3, 2021
PubMed
Summary

Computational design optimizes composite thin-walled structures for stability. Advanced methods transform unstable designs into safe, post-buckling structures, crucial for engineering applications.

Keywords:
Koiter methodcompositesimperfection sensitivitymaterial designoptimisationpost-bucklingshells

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Computational Mechanics

Background:

  • Lightweight thin-walled structures are vital in engineering.
  • Advanced manufacturing enables composite materials with spatially varying properties, like variable angle tow fibre composites and nanocomposites.
  • Failure in these structures is often buckling-sensitive to material and geometric imperfections.

Purpose of the Study:

  • To review recent computational developments for optimizing the buckling response of composite thin-walled structures.
  • To demonstrate transforming baseline unstable structures into stable ones operating safely in the post-buckling range.
  • To provide a numerical example of optimal material design for a curved panel.

Main Methods:

  • Discussion of mechanical and discrete models for composite shells.
  • Exploration of material parametrization and objective function definition.
  • Review of solution methods for load-displacement path tracing and imperfection sensitivity assessment.
  • Analysis of structural optimization algorithms.

Main Results:

  • Overview of computational strategies for enhancing structural stability.
  • Demonstration of transforming unstable structures into stable post-buckling designs.
  • Illustration of optimal material design for a curved panel through a numerical example.

Conclusions:

  • Computational design methods are essential for harnessing tunable composite materials.
  • Optimization techniques can significantly improve the buckling performance and post-buckling behavior of thin-walled structures.
  • The reviewed methods enable the creation of safer and more efficient composite structures.