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Related Concept Videos

Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

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...
Plastic Behavior01:21

Plastic Behavior

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 reloaded.
Residual Stresses in Bending01:18

Residual Stresses in Bending

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...
Internal Loadings in Structural Members: Problem Solving01:28

Internal Loadings in Structural Members: Problem Solving

When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal loadings...
Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

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...
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.

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Related Experiment Video

Updated: Jul 16, 2026

Cutting Procedures, Tensile Testing, and Ageing of Flexible Unidirectional Composite Laminates
07:53

Cutting Procedures, Tensile Testing, and Ageing of Flexible Unidirectional Composite Laminates

Published on: April 27, 2019

Understanding the Mechanisms Behind Increased Load Transfer in BMI-flCNT Composites Using Molecular Dynamics.

Swapnil S Bamane1, Prathamesh P Deshpande2, Aowabin Rahman3

  • 1Michigan Technological University, Houghton, Michigan 49931, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 15, 2026
PubMed
Summary

Strengthening polymer matrix composites (PMCs) for aerospace involves functionalizing carbon nanotube (CNT) reinforcements. Molecular dynamics simulations show that while functionalization improves composite strength, excessive modification can degrade material integrity.

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Last Updated: Jul 16, 2026

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Published on: May 17, 2018

Area of Science:

  • Materials Science
  • Computational Materials Science
  • Aerospace Engineering

Background:

  • Deep-space exploration requires lightweight, high-strength aerospace materials to minimize payload mass.
  • Polymer matrix composites (PMCs) with carbon-based reinforcements like carbon nanotubes (CNTs) are promising for aerospace applications.
  • The mechanical performance of PMCs is often limited by weak interfaces between the matrix and reinforcements.

Purpose of the Study:

  • To investigate methods for strengthening the interfacial region in bismaleimide (BMI)/flattened carbon nanotube (flCNT) composites.
  • To computationally assess the impact of chemical functionalization and interfacial cross-linking on composite mechanical performance using molecular dynamics (MD).
  • To determine the relationship between the degree of functionalization, cross-linking, and flCNT pullout forces.

Main Methods:

  • Utilized molecular dynamics (MD) simulations to model the interfacial region of BMI/flCNT composites.
  • Virtually introduced functionalization of flCNTs and covalent cross-links between BMI and flCNTs.
  • Predicted flCNT pullout forces as a function of functionalization degree and cross-link density.

Main Results:

  • Both functionalization of flCNTs and interfacial cross-linking significantly enhance the interfacial strength of the BMI/flCNT composite.
  • Higher degrees of functionalization were found to potentially degrade the overall material integrity.
  • flCNT pullout forces directly correlate with the extent of functionalization and the number of interfacial cross-links.

Conclusions:

  • Chemical functionalization and covalent cross-linking are critical for improving the interfacial strength of advanced aerospace composites.
  • Optimizing the degree of functionalization is essential to balance strengthening effects and maintain material integrity.
  • This research provides valuable physical insights into strengthening mechanisms for next-generation aerospace structural materials.