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Related Concept Videos

Plastic Deformations01:19

Plastic Deformations

226
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 Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

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When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
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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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Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

200
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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Plasticity00:58

Plasticity

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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...
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Stress-Strain Diagram - Ductile Materials01:24

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The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
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Related Experiment Video

Updated: Oct 18, 2025

Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes
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Progressive Collapse Safety Evaluation of Truss Structures Considering Material Plasticity.

Sheng-En Fang1,2, Chen Wu1, Xiao-Hua Zhang1

  • 1School of Civil Engineering, Fuzhou University, Fuzhou 350108, China.

Materials (Basel, Switzerland)
|September 28, 2021
PubMed
Summary

This study introduces an elastoplastic progressive collapse analysis for truss structures, considering material yielding for accurate failure prediction. The method identifies critical collapse paths by simulating member failure sequences, enhancing structural safety assessments.

Keywords:
bearing capacity coefficientsmaterial plasticityplastic importance coefficientsprogressive collapse analysistruss structures

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Area of Science:

  • Civil Engineering
  • Structural Analysis
  • Mechanical Engineering

Background:

  • Progressive collapse analysis is crucial for civil structures but often simplified using material elasticity.
  • Existing methods deviate from real-world scenarios due to neglecting material plasticity.

Purpose of the Study:

  • To propose an advanced progressive collapse analysis procedure for truss structures.
  • To incorporate elastoplastic material behavior for more realistic structural response prediction.

Main Methods:

  • Developed an elastoplastic analysis procedure for truss structures.
  • Introduced a plastic importance coefficient and bearing capacity coefficients.
  • Simulated member removal and incorporated plastic deformations into stiffness matrices.
  • Utilized iterative analysis until geometric instability and identified failure sequences.

Main Results:

  • The proposed method accurately predicts critical progressive collapse paths in truss systems.
  • Analysis incorporating elastoplasticity showed better agreement with experimental data.
  • The failure sequence of members was successfully identified through iterative analysis.

Conclusions:

  • The elastoplastic progressive collapse analysis method is feasible and reliable for truss structures.
  • This approach provides a more accurate assessment of structural integrity under extreme events.
  • The findings enhance the safety design of critical civil infrastructure.