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Non-destructive Tests for Concrete Strength01:12

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The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it...
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Development of a Weight-Drop Impact Testing Method for Dental Applications.

Satoru Watanabe1, Yoshiki Ishida1,2, Daisuke Miura1

  • 1Department of Dental Materials Science, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo 102-8159, Japan.

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|December 1, 2020
PubMed
Summary

The weight-drop impact test offers a simpler method for assessing dental material strength compared to notched tests. This study optimized conditions for accurate impact fracture energy measurement in small acrylic resin specimens.

Keywords:
CAD/CAM blocksdenture base materialsdynamic test methodimpact strengthweight-drop impact test

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Dental Materials Science

Background:

  • Traditional impact strength tests (Izod, Charpy) for dental materials require difficult notched specimen preparation.
  • A weight-drop impact test offers a potential alternative, avoiding the need for notches and potentially improving accuracy.

Purpose of the Study:

  • To establish optimal conditions for conducting a weight-drop impact test on small acrylic resin specimens.
  • To determine the most reliable method for measuring the impact fracture energy of acrylic resins using this technique.

Main Methods:

  • Investigated the influence of varying specimen diameters and thicknesses, striker diameters and weights, and supporting jig diameters.
  • Compared different parameters to identify conditions yielding consistent and reliable impact fracture energy measurements.

Main Results:

  • Impact fracture energy remained constant for all specimen thicknesses when the striker diameter was 6-10 mm and the supporting jig inner diameter was 8-10 mm.
  • The measured E50% value closely correlated with the median impact fracture energy, indicating test reliability.

Conclusions:

  • The weight-drop impact test is an effective method for evaluating the impact strength of small acrylic resin specimens.
  • Specifying test conditions, including specimen thickness, striker diameter, and jig inner diameter, is crucial for accurate material testing.