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Related Concept Videos

Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
427
Transformation of Plane Strain01:12

Transformation of Plane Strain

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When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
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Deformations in a Transverse Cross Section01:21

Deformations in a Transverse Cross Section

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When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
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Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

821
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
821
Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

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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...
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Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

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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...
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Structural Design and Manufacturing of a Cruiser Class Solar Vehicle
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Hull form optimization with a new three-dimensional deformation strategy.

Dezhi Wei1, Luyao Wang2, Jianghao Yang1

  • 1New Energy Engineering Institute, Power China Huadong Engineering Corporation Limited, Hangzhou, 311122, China.

Scientific Reports
|November 25, 2025
PubMed
Summary
This summary is machine-generated.

A new 3D shifting method allows hull form optimization in length, beam, and draft. This advanced technique reduced total resistance by 7.3% in Series 60 hull simulations.

Keywords:
Drag optimizationFree-surface wave elevationHull form deformationShifting method

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Area of Science:

  • Naval Architecture
  • Computational Fluid Dynamics
  • Optimization

Background:

  • The traditional shifting method is limited to longitudinal hull transformations.
  • Existing methods struggle with complex geometries and minimal longitudinal variations.
  • Adjustments in beam or draft are restricted, hindering comprehensive hull form optimization.

Purpose of the Study:

  • To propose a novel three-dimensional shifting method for hull form optimization.
  • To enable simultaneous deformation control in length, beam, and draft directions.
  • To minimize the total calm-water resistance of a Series 60 hull.

Main Methods:

  • Development and numerical validation of a 3D shifting method.
  • Computational Fluid Dynamics (CFD) simulations for resistance calculation.
  • Integration with Kriging surrogate model and a genetic algorithm for optimization.

Main Results:

  • The 3D shifting method demonstrated feasibility for comprehensive deformation control.
  • A 7.3% reduction in total calm-water resistance was achieved for the Series 60 hull.
  • The optimization process effectively utilized few variables for significant resistance reduction.

Conclusions:

  • The proposed 3D shifting method overcomes limitations of traditional approaches.
  • This method offers efficient and comprehensive control over hull geometry for optimization.
  • The CFD-based optimization successfully reduced hull resistance using the novel method.