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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...
Bending01:10

Bending

Pure bending is a fundamental concept in structural mechanics, essential for understanding how materials deform under symmetrical loads without direct forces. Pure bending occurs when prismatic members, such as beams, are subjected to equal and opposite moments that induce bending. The phenomenon is crucial as it allows for predicting stress distributions without the influence of axial or shear forces.
In pure bending, the bending stress in a beam is calculated based on the bending moment and...
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...
Shear and Bending Moment Diagram: Problem Solving01:24

Shear and Bending Moment Diagram: Problem Solving

When analyzing a beam supporting concentrated loads and a distributed load, drawing the shear and bending moment diagrams is essential. These diagrams help understand the internal forces and moments acting on the beam, which is crucial for designing safe and efficient structures. Follow these steps to create the shear and bending moment diagrams:
Draw a Free-Body Diagram: Start by drawing a free-body diagram of the entire beam, including the concentrated loads, distributed load, and reaction...
Deformation of a Beam under Transverse Loading01:15

Deformation of a Beam under Transverse Loading

Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
The insights from the bending moment diagram extend to...
Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

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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Related Experiment Video

Updated: May 14, 2026

Quantitative Analysis of Vacuum Induction Melting by Laser-induced Breakdown Spectroscopy
03:49

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Published on: June 10, 2019

Study of Bending Strength Detection Method for SMC Composites Based on Laser-Induced Breakdown Spectroscopy.

Hongbo Wang1,2, Mengke Gao1,2, Zhe Qiao1,2

  • 1State Key Laboratory of Smart Power Distribution Equipment and System, State Grid Jibei Electric Power Company Limited, Beijing 100054, China.

Materials (Basel, Switzerland)
|May 13, 2026
PubMed
Summary

This study uses Laser-Induced Breakdown Spectroscopy (LIBS) to assess the performance degradation of non-metallic electric energy metering cabinets. LIBS effectively predicts bending strength loss in aged Sheet Molding Compound (SMC) materials.

Keywords:
Laser-Induced Breakdown Spectroscopybending strengthsheet molding compoundthermal aging

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Electrical Engineering

Background:

  • Non-metallic electric energy metering cabinets are vital for power grid protection.
  • Environmental stressors cause aging and performance degradation in these cabinets, posing safety risks.
  • Current methods for evaluating cabinet casing performance are insufficient.

Purpose of the Study:

  • To investigate the performance degradation mechanisms of Sheet Molding Compound (SMC) under thermal aging.
  • To explore the feasibility of using Laser-Induced Breakdown Spectroscopy (LIBS) for quantitative evaluation of aged non-metallic cabinet materials.
  • To establish a predictive model for the bending strength of thermally aged SMC.

Main Methods:

  • Sheet Molding Compound (SMC) samples underwent thermal aging experiments.
  • Laser-Induced Breakdown Spectroscopy (LIBS) was employed for rapid multi-element detection and analysis.
  • Multi-analytical techniques were integrated with LIBS to assess material performance and microstructure.
  • A multivariate linear regression model was developed using LIBS spectral data (plasma temperature, K, Al, Ca line intensity ratios).

Main Results:

  • Thermal aging led to predictable performance degradation and microstructural changes in SMC.
  • LIBS spectral data correlated with the attenuation of bending strength over aging duration.
  • The developed regression model achieved a high coefficient of determination (R² = 0.9657) for predicting bending strength.
  • Key variables identified include plasma temperature and intensity ratios of K, Al, and Ca spectral lines.

Conclusions:

  • LIBS is a promising technique for rapid, non-contact evaluation of thermally aged non-metallic materials used in electric energy metering cabinets.
  • The study demonstrates the feasibility of quantitatively predicting bending strength using LIBS spectral data.
  • Further validation with larger datasets is recommended to improve the model's reliability and generalizability for real-world applications.