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Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

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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.
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The design of columns under centric load is a fundamental aspect of structural engineering and is critical for ensuring the stability and integrity of structures. Euler's and Secant's formulas are central to understanding and calculating the critical load and deformation behaviors of columns, providing a basis for safe and effective structural design.
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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under...
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An Innovative Failure Criterion for Metal Cylindrical Shells under Explosive Loads.

Yan Li1,2, Wen Wang1, Zhanfeng Chen1,3

  • 1School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China.

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Researchers developed a new failure criterion and equation for metal cylindrical shells under explosive loads, improving understanding of impact resistance and failure mechanisms in hazardous chemical storage.

Keywords:
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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Chemical Engineering

Background:

  • Metal cylindrical shells are critical for storing and transporting hazardous chemicals.
  • Assessing their impact resistance under explosive loads is a significant research challenge.

Purpose of the Study:

  • To propose an innovative failure criterion that incorporates the time effect for metal cylindrical shells subjected to explosive loads.
  • To develop a validated failure pressure equation for these shells.

Main Methods:

  • Development of a novel failure criterion based on the maximum shear stress criterion, including time-dependent factors.
  • Establishment of a metal cylindrical shell model.
  • Derivation of a failure pressure equation using the proposed criterion.
  • Verification of the equation through numerical simulations utilizing the finite element method.

Main Results:

  • A new time-dependent failure criterion for metal cylindrical shells under explosive loads was successfully formulated.
  • A validated failure pressure equation was derived based on this criterion.
  • Numerical simulations confirmed the accuracy and applicability of the proposed equation.

Conclusions:

  • The developed failure criterion and equation provide a significant advancement in understanding the failure mechanisms of metal cylindrical shells under explosive impacts.
  • This research is crucial for enhancing the safety and design of piping and pressure vessels used in hazardous material containment.