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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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Exploring Ductility in Dental Ceramics.

L M M Alves1,2, C S Rodrigues1,2, S Vardhaman1,3

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

Journal of Dental Research
|June 11, 2022
PubMed
Summary
This summary is machine-generated.

Understanding the ductile-brittle threshold in dental ceramics is crucial. Microcontact tests reveal critical loads and dimensions for brittle fracture, guiding machining for improved strength and cost-effective fabrication.

Keywords:
biaxial flexural strength, machiningbrittle fracturegrindinggrit blastingmicrocontact thresholds

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Biomaterials

Background:

  • Ceramic processing involves two main damage regimes: brittle (crack formation) and ductile (quasiplasticity).
  • Brittle damage significantly threatens material strength, necessitating an understanding of ductile-brittle thresholds.
  • Contemporary computer-aided design/computer-aided manufacturing (CAD/CAM) dental ceramics require precise machining protocols.

Purpose of the Study:

  • To establish the ductile-brittle thresholds for CAD/CAM dental ceramics using microcontact tests.
  • To correlate material strength with indentation load and identify critical parameters for damage regimes.
  • To explore methods for quantifying ductile shaping conditions for efficient prosthesis fabrication.

Main Methods:

  • Controlled microcontact tests utilizing a sharp indenter were performed on dental ceramics.
  • Flexural strength (S) was plotted against indentation load (P) to analyze damage regimes.
  • Analysis focused on identifying threshold dimensions and loads relevant to grit finishing.

Main Results:

  • A steep decline in flexural strength was observed beyond the identified ductile-brittle threshold.
  • Threshold dimensions were found to be on the order of 1 µm, with critical contact loads around 1 N.
  • These findings are pertinent to practical grit finishing processes in ceramic machining.

Conclusions:

  • Understanding and operating within the ductile regime of ceramic shaping offers significant time and cost savings in prosthesis fabrication.
  • Reducing grit size, applied load, and depth of cut are key to accessing the ductile regime.
  • Analogous S(P) plots, using machining variables instead of load, can quantify critical conditions for ductile shaping.