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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...
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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Stress Concentrations01:24

Stress Concentrations

Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller width...
Stress Concentrations01:13

Stress Concentrations

The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
The stress concentration...
Prismatic Beams: Problem Solving01:15

Prismatic Beams: Problem Solving

In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
The design begins with analyzing the beam as a free body to identify moments and force balances, thereby determining support reactions. Next, the designer...
Plastic Deformations01:19

Plastic Deformations

Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their original...

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Cutting Procedures, Tensile Testing, and Ageing of Flexible Unidirectional Composite Laminates
07:53

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Published on: April 27, 2019

An improved failure criterion for biological and engineered staggered composites.

Francois Barthelat1, Ahmad Khayer Dastjerdi, Reza Rabiei

  • 1Department of Mechanical Engineering, McGill University, 817 Sherbrooke Street West, Montreal, Quebec, Canada H3A 2K6. francois.barthelat@mcgill.ca

Journal of the Royal Society, Interface
|December 11, 2012
PubMed
Summary

Engineered staggered composites mimic natural materials for enhanced performance. A new failure criterion accounts for complex stresses and defects, enabling optimized design of these bio-inspired materials.

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Area of Science:

  • Materials Science
  • Bio-inspired Engineering
  • Mechanical Engineering

Background:

  • High-performance natural materials like nacre and bone utilize staggered microstructures.
  • This structure provides a combination of stiffness, strength, and toughness.
  • Bio-inspired composites mimic this structure for improved material properties.

Purpose of the Study:

  • To develop a novel failure criterion for staggered composites.
  • To address limitations of existing simplified models for inclusion fracture.
  • To enable better design and optimization of bio-inspired materials.

Main Methods:

  • Development of a new failure criterion considering complex stress fields and initial defects.
  • Formulation of 'optimum' and 'conservative' criteria based on shear traction distribution.
  • Validation through experiments on alumina composites and comparison with nacre data.

Main Results:

  • The new criterion accurately predicts inclusion fracture in staggered composites.
  • It accounts for various interfacial material behaviors and load transfer mechanisms.
  • Experimental validation confirmed the criterion's efficacy on alumina and nacre.

Conclusions:

  • The developed criterion provides a versatile tool for designing bio-inspired staggered composites.
  • It offers new design insights, favoring high aspect ratio inclusions with weaker interfaces.
  • This work facilitates the optimal design of advanced bio-inspired materials across various scales.