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Related Concept Videos

Applications of Stress01:04

Applications of Stress

247
Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...
247
Wood Fasteners01:18

Wood Fasteners

89
In wood construction, fasteners are essential for securing components together, with the connection strength largely dependent on the direct bearing between members. Various types of fasteners are employed, each suited to specific applications and structural requirements.
Nails are the most common fasteners, consisting of sharp-pointed metal pins that are driven into wood using a hammer or a mechanical nail gun. They come in a variety of diameters, heads, and lengths. Nailing techniques include...
89
Steel Fastening Techniques01:17

Steel Fastening Techniques

136
Steel sections can be joined together through various fastening techniques including riveting, bolting, and welding, each suitable for different structural requirements and conditions.
Rivets are cylindrical steel fasteners with a specially designed head. During application, rivets are heated until white-hot and then inserted through pre-drilled holes in the steel sections. A pneumatic hammer is used to shape the exposed end into a second head, securing the sections together.
Bolting is another...
136
Stability of structures01:14

Stability of structures

156
In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
156
Design Consideration01:22

Design Consideration

181
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...
181
Corrosion of Reinforcement01:27

Corrosion of Reinforcement

162
The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
162

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How do roses build failure-resistant anchoring tools?

Liat Levavi1, Benny Bar-On1

  • 1Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel.

PNAS Nexus
|December 11, 2024
PubMed
Summary
This summary is machine-generated.

Dog rose prickles offer robust anchoring and defense through unique structural designs. These plant-based tools inspire advanced micro-engineering for robotics and medical devices.

Keywords:
finite-element simulationsfunctional adaptationload-bearingmultiscale structural mechanicsplants biomechanics

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Area of Science:

  • Biomechanics
  • Materials Science
  • Plant Biology

Background:

  • Rose prickles serve dual roles: physical defense and aiding growth by anchoring.
  • Understanding their structure-mechanical properties is key to biomimicry.

Purpose of the Study:

  • To investigate the structural and mechanical properties of dog rose (Rosa canina) prickles.
  • To uncover the design strategies behind their damage resistance and anchoring capabilities.

Main Methods:

  • Multiscale structural observations
  • Nanomechanical characterizations
  • Finite-element simulations

Main Results:

  • Dog rose prickles exhibit structural-mechanical modifications across multiple length scales.
  • These modifications create macroscopic stress-locking effects, enhancing damage resistance.
  • The prickle's design prevents catastrophic failure, ensuring functional integrity.

Conclusions:

  • Rose prickles possess unique, multi-scale design strategies for extreme damage resistance and secure anchoring.
  • These natural biomechanical principles can inform the development of futuristic micro-engineered anchoring systems.