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Statistical Analysis of the Lifetime of Diamond-Impregnated Tools for Core Drilling of Concrete

  • Nadja MalevichEmail author
  • Christine H. Müller
  • Michael Kansteiner
  • Dirk Biermann
  • Manuel Ferreira
  • Wolfgang Tillmann
Chapter
Part of the Studies in Classification, Data Analysis, and Knowledge Organization book series (STUDIES CLASS)

Abstract

The lifetime of diamond-impregnated tools for core drilling of concrete is studied via the lifetimes of the single diamonds on the tool. Thereby, the number of visible and active diamonds on the tool surface is determined by microscopical inspections of the tool at given points in time. This leads to interval-censored lifetime data if only the diamonds visible at the beginning are considered. If also the lifetimes of diamonds appearing during the drilling process are included, then the lifetimes are doubly interval-censored. We use a well-known maximum likelihood method to analyze the interval-censored data and derive a new extension of it for the analysis of the doubly interval-censored data. The methods are applied to three series of experiments which differ in the size of the diamonds and the type of concrete. It turns out that the lifetimes of small diamonds used for drilling into conventional concrete are much shorter than the lifetimes when using large diamonds or high-strength concrete.

Notes

Acknowledgements

The authors gratefully acknowledge support from the Collaborative Research Center “Statistical Modelling of Nonlinear Dynamic Processes” (SFB 823, B4) of the German Research Foundation (DFG).

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Nadja Malevich
    • 1
    Email author
  • Christine H. Müller
    • 1
  • Michael Kansteiner
    • 2
  • Dirk Biermann
    • 2
  • Manuel Ferreira
    • 2
  • Wolfgang Tillmann
    • 2
  1. 1.Department of StatisticsTU University DortmundDortmundGermany
  2. 2.Institute of Machining TechnologyTU University DortmundDortmundGermany

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