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Related Concept Videos

Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as the...
Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
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Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

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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Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
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.
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Stresses under Combined Loadings

When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
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Related Experiment Video

Updated: Jun 18, 2026

Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes
06:34

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Published on: January 6, 2023

Test-based equivalent-material method for collapse qualification of helically wound and layered cylindrical

Yuteng Zhang1, Mohsen Saneian2, Yong Bai1

  • 1College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, Zhejiang, P.R. China.

Communications Engineering
|June 16, 2026
PubMed
Summary

A new equivalent-material method (EMM) predicts collapse resistance in pressurized shells using simple flat-plate tests. This approach avoids costly hyperbaric chambers and complex models for reliable material qualification.

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Last Updated: Jun 18, 2026

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Structural Analysis

Background:

  • Accurate collapse resistance qualification is vital for pressurized cylindrical shells in offshore, aerospace, and biomedical applications.
  • Current methods like hyperbaric chambers are expensive, and simplified models often ignore critical factors such as residual stresses and imperfections.

Purpose of the Study:

  • To develop a cost-effective and physically faithful method for qualifying the collapse resistance of layered cylindrical shells.
  • To replace traditional, resource-intensive full-scale testing with a more accessible approach.

Main Methods:

  • Introduction of the back-inferred equivalent-material method (EMM).
  • EMM transforms flat-plate compression test data into a nonlinear constitutive law.
  • This equivalent law is embedded into a homogeneous finite-element model to simulate hydrostatic collapse.

Main Results:

  • The EMM successfully reproduces hydrostatic collapse behavior.
  • Demonstrated accuracy on flexible-pipe carcass layers and steel-strip reinforced thermoplastic pipes.
  • Results show close agreement with explicit-geometry simulations and hyperbaric measurements.

Conclusions:

  • The proposed geometry-agnostic EMM offers a rapid, low-cost alternative to hyperbaric testing.
  • This method provides physically faithful collapse resistance qualification for diverse layered shells.
  • Enables broader application across energy, aerospace, and biomedical industries.