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Related Concept Videos

Frustration and Conflict: Avoidance-Avoidance, Double-Approach Avoidance01:14

Frustration and Conflict: Avoidance-Avoidance, Double-Approach Avoidance

Avoidance-avoidance conflict refers to a psychological situation where a person must choose between two or more unpleasant alternatives. These conflicts are particularly stressful because neither option is desirable. This dilemma is often expressed in sayings like "caught between a rock and a hard place" or "between the devil and the deep blue sea." For instance, individuals who fear dental procedures may find themselves torn between enduring a painful toothache or facing the anxiety of...
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Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in the...
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Tensile Strength Considerations of Concrete

Considering the tensile strength of concrete involves recognizing that the theoretical strength of cement paste can be up to a thousand times higher than what is observed in practical applications. This significant discrepancy is largely attributed to the presence of microscopic cracks within the concrete. These cracks tend to amplify stress at their tips when a load is applied, a phenomenon explained by Griffith's theory of brittle fracture.
The dimensions and shape of a concrete specimen also...
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Frustration occurs when people are obstructed or prevented from achieving a desired goal or fulfilling a perceived need. For example, when someone's input is ignored in a discussion, it can lead to feelings of frustration. Conflict, however, arises from opposing interests, goals, or actions. Conflicts can take various forms based on the nature of these opposing desires or goals.
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Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
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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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Fragility Assessment of Bovine Cortical Bone Using Scratch Tests
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Published on: November 30, 2017

The conflicts between strength and toughness.

Robert O Ritchie1

  • 1Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. RORitchie@lbl.gov

Nature Materials
|October 25, 2011
PubMed
Summary
This summary is machine-generated.

Achieving both strength and toughness in materials is challenging, as these properties often conflict. This study explores new strategies in metallic glasses, ceramics, and biomaterials to overcome this trade-off for improved damage tolerance.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Biomimetics

Background:

  • Structural materials require both high strength and toughness, properties that are typically mutually exclusive.
  • The compromise between hardness and ductility has historically limited the development of damage-tolerant materials.
  • Safety-critical applications necessitate materials with high fracture resistance to prevent catastrophic failure.

Purpose of the Study:

  • To examine novel strategies for achieving simultaneous strength and toughness in materials.
  • To investigate the interplay between mechanisms governing strength and toughness at various length scales.
  • To demonstrate how advanced and natural materials can overcome the strength-toughness conflict.

Main Methods:

  • Analysis of newer strategies in materials development.
  • Examination of examples from metallic glasses, natural/biological materials, and structural/biomimetic ceramics.
  • Focus on the relationship between microstructural architecture and material properties.

Main Results:

  • Identified new strategies that challenge the traditional strength-toughness compromise.
  • Highlighted the role of different length scales in material architecture on mechanical properties.
  • Demonstrated unprecedented damage tolerance in select material classes.

Conclusions:

  • It is possible to achieve high strength and toughness concurrently by understanding and manipulating underlying mechanisms.
  • Natural and engineered materials offer promising avenues for developing superior damage-tolerant structural components.
  • Future material design can move beyond compromise towards synergistic property enhancement.