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Stress-Strain Diagram - Brittle Materials01:24

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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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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
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Fracture Modes in Curved Brittle Layers Subject to Concentrated Cyclic Loading in Liquid Environments.

Jae-Won Kim1, Van P Thompson1, E Dianne Rekow2

  • 1Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY 10010, USA.

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Brittle curved glass structures crack more easily under cyclic indentation than flat ones. This study reveals lower critical loads for cone cracks and faster radial crack propagation in curved specimens due to mechanical fatigue.

Keywords:
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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Solid Mechanics

Background:

  • Brittle materials like quartz glass are susceptible to fracture.
  • Understanding damage mechanisms in curved structures is crucial for engineering applications.
  • Cyclic loading can induce material fatigue and failure at lower stress levels.

Purpose of the Study:

  • To investigate the damage response of brittle curved structures under cyclic Hertzian indentation.
  • To compare the crack initiation and propagation behavior of curved versus flat quartz glass specimens.
  • To identify factors influencing failure modes in curved brittle components.

Main Methods:

  • Fabrication of hemi-cylindrical quartz glass shells bonded to polymeric supports.
  • Cyclic indentation testing using a spherical tungsten carbide indenter in an aqueous environment.
  • Recording critical loads and cycle counts for cone and radial crack initiation and propagation.
  • Comparison with control tests on flat quartz glass plates.

Main Results:

  • Cone cracks initiated at lower loads and propagated to the quartz/polymer interface in curved specimens compared to flat ones.
  • Flexural radial cracks required higher loads for initiation in curved specimens.
  • Radial cracks propagated rapidly in curved specimens under cyclic loading due to fatigue and tensile stress distribution.

Conclusions:

  • Curved brittle structures exhibit distinct damage mechanisms compared to flat structures under cyclic indentation.
  • The geometry of curved structures influences crack initiation, propagation, and overall failure modes.
  • Mechanical fatigue plays a significant role in the rapid propagation of radial cracks in curved specimens.