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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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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.
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Stress-Strain Diagram - Ductile Materials01:24

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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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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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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 Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults
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Brittle-Ductile Threshold in Lithium Disilicate under Sharp Sliding Contact.

M Bawazir1,2, C H Lim1, P Arnés-Urgellés3

  • 1Department of Preventive and Restorative Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA.

Journal of Dental Research
|June 15, 2024
PubMed
Summary

Researchers explored ductile-regime grinding to improve dental ceramic strength. They found a 70 mN threshold below which damage is avoided, paving the way for stronger ceramic restorations.

Keywords:
brittle−ductile transitionductile grindinglithia glass-ceramicsscratch loadstrength degradationsubsurface damage

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Last Updated: Jun 23, 2025

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Dental Ceramics

Background:

  • Computer-aided design/computer-aided manufacturing (CAD/CAM) milling and grinding of dental ceramics can cause microfractures, weakening restorations.
  • Current brittle-regime grinding is detrimental to ceramic strength.
  • Ductile-regime grinding offers a potential solution for fabricating stronger ceramic dental restorations.

Purpose of the Study:

  • To analyze damage caused by current brittle-regime grinding of dental ceramics.
  • To investigate the potential of ductile-regime grinding as a safer and efficient alternative.
  • To determine the brittle-ductile transition threshold load for lithium disilicate glass-ceramic.

Main Methods:

  • Micro-scratch tests on lithium disilicate glass-ceramic (IPS e.max CAD) specimens.
  • Biaxial flexure strength tests to assess strength degradation after scratching.
  • Scanning electron microscopy (SEM) and focused ion beam (FIB) for surface and subsurface damage analysis.

Main Results:

  • SEM revealed both ductile and brittle removal modes during scratching.
  • A brittle-ductile transition threshold load of 70 mN was determined using FIB and strength tests.
  • Specimens tested below 70 mN showed no strength degradation or subsurface cracks.

Conclusions:

  • The brittle-ductile transition threshold is critical for damage-free ceramic processing.
  • Ductile-regime grinding below 70 mN can prevent strength degradation in dental ceramics.
  • This research lays the groundwork for developing damage-free ductile-regime milling protocols for dental restorations.