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Related Concept Videos

Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

304
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...
304
Residual Stresses in Bending01:18

Residual Stresses in Bending

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In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
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Plastic Deformations01:19

Plastic Deformations

351
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...
351
Plastic Deformations01:14

Plastic Deformations

336
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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Plastic Behavior01:21

Plastic Behavior

450
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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Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

279
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...
279

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Progressive Failure Analysis of Laminates with Embedded Wrinkle Defects Based on an Elastoplastic Damage Model.

Zhi Hua Ning1, Guan Liang Huo1, Ren Huai Liu1

  • 1MOE Key Laboratory of Disaster Forecast and Control in Engineering, School of Mechanics and Construction Engineering, Jinan University, Guangzhou 510632, China.

Materials (Basel, Switzerland)
|May 30, 2020
PubMed
Summary

This study developed an advanced elastoplastic damage model to accurately predict the failure of composite laminates with out-of-plane wrinkles under compression. The model captures material degradation and nonlinear behavior, improving strength predictions compared to elastic models.

Keywords:
elastoplastic damage modelfiber kinkingfracture planeprogressive failure analysiswrinkle defect

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Area of Science:

  • Composite Materials Science
  • Mechanical Engineering
  • Computational Mechanics

Background:

  • Out-of-plane wrinkles significantly impact composite laminate mechanical performance.
  • Accurate prediction of progressive failure in defected laminates is crucial for structural integrity.

Purpose of the Study:

  • To investigate the progressive failure behavior of fiber-reinforced composite laminates with out-of-plane wrinkles under axial compression.
  • To develop and implement a 3D elastoplastic damage model for accurate failure analysis.

Main Methods:

  • Developed a 3D elastoplastic damage model incorporating four damage modes (fiber tensile, matrix, fiber kinking/splitting, delamination) based on the LaRC05 criterion.
  • Proposed a modified algorithm combining golden section search and inverse interpolation for efficient fracture angle analysis.
  • Implemented the model in Abaqus/Explicit using a user-defined material subroutine.

Main Results:

  • The elastoplastic damage model provided more accurate compressive strength predictions than an elastic damage model.
  • The model successfully described laminate nonlinearity during damage evolution and identified correct damage locations, aligning with experimental data.
  • Plasticity effects are significant and should be considered even in laminates with low wrinkle levels.

Conclusions:

  • The developed elastoplastic damage model accurately predicts the progressive failure of composite laminates with out-of-plane wrinkles.
  • The model's ability to capture nonlinearity and damage localization enhances prediction accuracy for axially compressed composite structures.
  • Neglecting plasticity can lead to inaccurate assessments, particularly in composites with minor wrinkle defects.