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Related Concept Videos

Internal Loadings in Structural Members: Problem Solving01:28

Internal Loadings in Structural Members: Problem Solving

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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...
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Unsymmetric Loading of Thin-Walled Members01:23

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Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
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Unsymmetric Loading of Thin-Walled Members: Problem Solving01:07

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The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
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Composite Bodies

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A composite body is a body made up of multiple parts, connected to form a larger, unified object. Each part has its own weight and center of gravity, which must be considered to determine the center of gravity of the composite body. In cases where the density or specific weight is constant, the center of gravity coincides with the centroid.
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Deformation of a Beam under Transverse Loading01:15

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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.
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Bending of Members Made of Several Materials01:11

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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.
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Structural Design and Manufacturing of a Cruiser Class Solar Vehicle
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Improving the dynamic characteristics of body-in-white structure using structural optimization.

Aizzat S Yahaya Rashid1, Rahizar Ramli1, Sallehuddin Mohamed Haris2

  • 1Advanced Computational and Applied Mechanics (ACAM) Group, Centre for Transportation Research (CTR), Faculty of Engineering, Universiti Malaya, 50603 Kuala Lumpur, Malaysia.

Thescientificworldjournal
|August 8, 2014
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Summary

This study optimizes car body-in-white (BIW) structures to enhance noise, vibration, and harshness (NVH) and crashworthiness. By reinforcing critical areas identified through topology and size optimization, engineers can improve dynamic performance without sacrificing stiffness or increasing mass.

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Area of Science:

  • Automotive Engineering
  • Structural Dynamics
  • Computational Mechanics

Background:

  • The dynamic behavior of a car's body-in-white (BIW) structure critically impacts noise, vibration, harshness (NVH), and crashworthiness.
  • Improving BIW dynamic characteristics is essential to prevent failures related to resonance and fatigue.

Purpose of the Study:

  • To enhance existing torsion and bending modes of BIW structures using structural optimization under dynamic loads.
  • To achieve target vibration specifications without compromising the overall mass and stiffness of the structure.

Main Methods:

  • Topology optimization was employed to identify critical structural locations using mass and natural frequencies as design variables.
  • Size optimization was subsequently used to determine and adjust the target thickness of individual components at identified critical regions.
  • A combined approach integrating topology and size optimization was proposed for an improved design modification process.

Main Results:

  • The study identified crucial points within the BIW structure for reinforcement to modify natural frequencies.
  • Optimization steps suggested specific design modifications, including altering component thicknesses, to meet vibration targets.
  • The proposed method demonstrated the potential to improve dynamic characteristics while maintaining structural stiffness.

Conclusions:

  • Structural optimization techniques, particularly when combined, offer an effective strategy for refining BIW dynamic behavior.
  • Targeted reinforcement and thickness adjustments can significantly improve NVH and crashworthiness performance.
  • The research provides a pathway for designing more robust and dynamically superior automotive structures.