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Euler's formula is used in structural engineering to determine the buckling load of columns under various conditions. However, when dealing with systems that incorporate both rigid elements and elastic components, such as springs, the analysis requires a finer approach to determine the critical load. The problem described involves two rigid bars connected at a pivot point with a spring attached and a vertical load applied at one end.
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The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
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Structure Design of GFRP Composite Leaf Spring: An Experimental and Finite Element Analysis.

Linlin Ma1, Jingwu He2, Yizhuo Gu1

  • 1School of Materials Science and Engineering, Beihang University, 37 Xueyuan Road, Beijing 100191, China.

Polymers
|April 30, 2021
PubMed
Summary

This study developed an algorithm for optimizing composite leaf springs, achieving required stiffness and strength for automotive applications. This innovation reduces vehicle weight by replacing heavy steel springs.

Keywords:
composite leaf springfilament winding processfinite element analysismechanical propertiesstructural design

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Area of Science:

  • Materials Science and Engineering
  • Mechanical Engineering
  • Automotive Engineering

Background:

  • Composite leaf springs offer high load capacity and low weight, making them ideal replacements for heavy steel springs in vehicles.
  • Optimizing the structural design of composite leaf springs is crucial for significant weight reduction in automobiles.

Purpose of the Study:

  • To develop an effective algorithm for the structural optimization of composite leaf springs with variable width and thickness.
  • To validate the mechanical performance of the optimized composite leaf spring through experimental and computational methods.

Main Methods:

  • Developed an optimization algorithm for composite leaf spring design.
  • Fabricated composite leaf springs using the filament winding process.
  • Created a 3D finite element (FE) model for simulation.
  • Conducted three-point bending tests on both experimental samples and the FE model.

Main Results:

  • The designed composite leaf spring demonstrated bending stiffness meeting automotive industry requirements.
  • Stress analysis confirmed that the material strength requirements were satisfied in all directions.
  • Experimental and simulation results showed good agreement, validating the design approach.

Conclusions:

  • The developed algorithm effectively optimizes composite leaf spring design for stiffness and strength.
  • The optimized composite leaf springs are suitable for automotive applications, contributing to weight reduction.
  • This research advances the design methodology for high-performance composite automotive components.