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Related Concept Videos

Design Consideration01:22

Design Consideration

339
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.
The factor of safety is another key...
339
Design Example: Calculating Safe Diameter for Wind-Exposed Disc01:17

Design Example: Calculating Safe Diameter for Wind-Exposed Disc

188
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...
188
Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

389
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
389
Design Example: Application of Archimedes' Principle01:11

Design Example: Application of Archimedes' Principle

337
Archimedes' principle is fundamental in analyzing the buoyant force and stability of floating bodies. In this example, a wooden block with a rectangular section floats in seawater. Based on the block's dimensions, its specific gravity and the specific weight of seawater are used to find the volume of water displaced and the center of buoyancy.
The volume of seawater displaced by the block is determined by first calculating the block's weight. This is done by multiplying the...
337
Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

158
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.
The concept of the shear center is crucial in countering the...
158
Design Example: Distributing Reinforcements in Concrete Sections01:22

Design Example: Distributing Reinforcements in Concrete Sections

138
The topic explores the practical aspects of adjusting steel reinforcements within a concrete beam section to meet specific design requirements. When designing a reinforced concrete beam, it is essential to distribute the steel reinforcements properly to ensure structural integrity and efficiency. The example provided details a scenario where a beam requires a total steel cross-section of 4 square inches. The engineer identifies that the available steel bars have a nominal diameter of 1.693...
138

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Structural Design and Manufacturing of a Cruiser Class Solar Vehicle
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Impact Resistant Structure Design and Optimization Inspired by Turtle Carapace.

Baoqing Pei1, Lei Guo1, Xueqing Wu1

  • 1Beijing Key Laboratory for Design and Evaluation Technology of Advanced Implantable & Interventional Medical Devices, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China.

Materials (Basel, Switzerland)
|April 23, 2022
PubMed
Summary
This summary is machine-generated.

Inspired by turtle shells, bionic composite materials were developed to enhance impact resistance. These novel structures, mimicking natural designs, demonstrated significant improvements in protecting against impacts.

Keywords:
bionic structureimpact resistancesandwich structureturtle carapace

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Area of Science:

  • Materials Science
  • Biomimetics
  • Mechanical Engineering

Background:

  • The turtle carapace exhibits exceptional impact resistance due to its intricate biological structure.
  • Bionic theory offers a promising avenue for enhancing composite material performance by mimicking natural designs.

Purpose of the Study:

  • To investigate the chemical and mechanical properties of the turtle carapace.
  • To design and validate bionic sandwich structures inspired by the turtle carapace for improved impact resistance in composite materials.

Main Methods:

  • Analysis of turtle carapace composition and mechanical properties.
  • Design of bionic sandwich structures using modeling software, based on turtle carapace microstructures (keratin scutes, spongy bone, spine).
  • Validation through finite element analysis and drop-weight impact experiments.

Main Results:

  • All designed bionic structures showed enhanced impact resistance compared to the control group.
  • Specific structural elements like split plates, gradient pore cores, and stiffened backplates significantly improved impact performance.
  • Numerical and experimental results confirmed the effectiveness of the bionic designs.

Conclusions:

  • The study provides a theoretical foundation for optimizing composite materials using bionic principles derived from turtle carapace structures.
  • Mimicking the microstructure of the turtle carapace can lead to superior impact-resistant composite materials.
  • Further research into bionic composite materials holds potential for advanced protective applications.