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Related Concept Videos

Fatigue01:21

Fatigue

226
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
226
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

277
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
277
Stress-Strain Diagram - Ductile Materials01:24

Stress-Strain Diagram - Ductile Materials

933
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...
933
Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

248
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...
248
Residual Stresses in Bending01:18

Residual Stresses in Bending

237
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...
237
Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

136
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...
136

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Related Experiment Video

Updated: Aug 23, 2025

Cutting Procedures, Tensile Testing, and Ageing of Flexible Unidirectional Composite Laminates
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Multiscale Progressive Failure Analysis of 3D Woven Composites.

Trenton M Ricks1, Evan J Pineda1, Brett A Bednarcyk1

  • 1NASA Glenn Research Center, Cleveland, OH 44135, USA.

Polymers
|October 27, 2022
PubMed
Summary

This study presents a multiscale modeling approach for 3D woven composites, enhancing design and analysis. The model accurately predicts tensile behavior and captures shear response, aiding in the development of advanced composite materials.

Keywords:
3D woven compositesX-ray CThomogenizationmethod of cellsmicromechanicsmultiscale modelingprogressive failure

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Computational Modeling

Background:

  • Three-dimensional (3D) woven composites offer advantages over traditional ply-based materials but present significant modeling challenges due to complex multiscale geometries.
  • Accurate prediction of mechanical behavior is crucial for the expanding application of these advanced materials.
  • Existing modeling techniques often struggle with the intricate nature of 3D woven structures.

Purpose of the Study:

  • To develop and apply an efficient, semi-analytical multiscale modeling procedure for 3D woven carbon-epoxy composites.
  • To incorporate realistic microstructural features, including binder-tow disbonds and weft-tow waviness, into the model.
  • To validate the model's predictions against experimental data for in-plane tensile and shear behavior.

Main Methods:

  • Utilized efficient, semi-analytical micromechanical theories, avoiding traditional finite element methods.
  • Employed a crack-band progressive damage model for the matrix to capture nonlinear responses.
  • Integrated microstructural data from X-ray computed tomography (CT) and scanning electron microscopy (SEM) to define realistic dimensions and volume fractions.
  • Incorporated observed microstructural defects like binder-tow disbonds and weft-tow waviness.

Main Results:

  • The multiscale model demonstrated good correlation with experimental data for the in-plane tensile behavior of the 3D woven composite.
  • The model successfully captured the less brittle nature observed in the in-plane shear response.
  • Quantitative predictions for shear behavior were somewhat underpredicted compared to experimental results.

Conclusions:

  • The presented semi-analytical multiscale modeling procedure is a viable and efficient alternative for analyzing 3D woven composites.
  • The model's ability to incorporate microstructural details enhances its predictive capability for complex composite behavior.
  • Further refinement may be needed to improve quantitative accuracy in shear response predictions.