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Related Concept Videos

Design Example: Calculating Safe Diameter for Wind-Exposed Disc01:17

Design Example: Calculating Safe Diameter for Wind-Exposed Disc

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Assessing safety in wind-exposed installations is crucial to preventing potential failures. This example explores the calculation and design adjustments needed to mount a circular disc on a building facade, where wind forces are a primary concern. A 4-meter diameter disc was initially designed as an aesthetic feature facing winds at a velocity of 25 meters per second, with an air density of 1.25 kilograms per cubic meter. Given these conditions, the drag force on the disc was determined using...
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Design Consideration01:22

Design Consideration

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Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
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Yield Criteria for Ductile Materials under Plane Stress01:25

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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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Blast Quantification Using Hopkinson Pressure Bars
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Numerical Investigation on Anti-Explosion Performance of Non-Metallic Annular Protective Structures.

Xiaobing Bian1, Lei Yang1, Tao Wang1

  • 1State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China.

Materials (Basel, Switzerland)
|December 23, 2023
PubMed
Summary
This summary is machine-generated.

Non-metallic annular protective structures using polyethylene (PE) fibers offer lightweight blast protection. Adding polyurethane foam significantly enhances protection by reducing stress on PE fiber layers.

Keywords:
UHMWPEblast protectionnon-metallic annular structuresnumerical simulation

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Research and Development of High-performance Explosives
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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Defense Technology

Background:

  • Explosive shock wave protection is critical for military and public safety.
  • Non-metallic structures offer lightweight advantages and reduced secondary damage.
  • Continuous winding of polyethylene (PE) fibers is explored for protective applications.

Purpose of the Study:

  • Investigate the dynamic mechanical response of non-metallic annular protective structures under internal blast.
  • Analyze the effects of charge weight, PE fiber layers, and polyurethane foam on structural integrity.
  • Provide insights for numerical simulations of non-metallic explosion protection.

Main Methods:

  • Numerical simulations were employed to model the blast response.
  • The study varied parameters including explosive charge, number of PE fiber layers, and polyurethane foam thickness.
  • Dynamic mechanical responses and damage to the structures were analyzed.

Main Results:

  • 120 layers of PE fibers demonstrated protection against 50g TNT equivalent explosives.
  • Increasing only PE fiber layers showed diminishing returns in protection efficiency.
  • Incorporating a 30mm polyurethane foam layer reduced equivalent stress on PE fibers by 41.6%.

Conclusions:

  • Polyurethane foam effectively mitigates stress on PE fiber layers, enhancing blast protection.
  • Optimizing material composition, not just thickness, is key for efficient non-metallic protective structures.
  • The findings offer valuable data for designing and simulating advanced explosion protection systems.