Abstract

A simple method based on that described in the international standard NF ISO 5017 is implemented to determine the apparent porosity of samples of limestone. Its effectiveness is demonstrated and the points to be particularly controlled (drying, soaking, wiping) to avoid gross errors are highlighted depending on the type of porosity (thin or wide). This study shows that the standard NF ISO 5017 established for dense shaped refractory products is also well suited for solid rock with homogeneous structure having a true porosity of less than 45 %. This standard properly implemented for rock samples allows one to determine their apparent porosity with a standard uncertainty of about 0.1 %.

Key words

limestone
apparent porosity
gravimetric method
uncertainty in measurement

Abstract

This article is a review about “additive manufacturing”, popularized under “3D printing”, and takes an inventory of the tests and metrological needs that the technology generates. It defines additive manufacturing and presents the materials used, the significance and the brakes of the technology, and application areas. It also lists and describes in detail the principle of the seven categories of processes that the technology counts.

Erratum

This paper has been rectified with an error mentioned in n° 41, vol. 2016-1

Key words

additive manufacturing
3d printing
tests
metrology

Abstract

The Monte-Carlo Method, described in the Guide for Uncertainty Measurement Supplement 1, is advocated by metrologists to evaluate the uncertainty of measurement. This method requires computational resources to generate random numbers, which is a limit for a common use compared with the GUM uncertainty framework. In order to popularize the Monte-Carlo method, LNE-MCM software was developed as a user-friendly software by the Laboratoire national de métrologie et d'essais. LNE-MCM is dedicated to the evaluation of measurement uncertainty using Monte Carlo simulations according to the principles of the supplement 1 to the GUM. Moreover, additional features are implemented: the case of multivariate models, sensitivity analysis to provide an uncertainty budget and a goodness-of-fit test for the samples of the output quantities. LNE-MCM is freely available on LNE's website since January 2016.

Key words

measurement uncertainty
monte-carlo method
supplement 1 to the gum
sensitivity analysis

Abstract

This article is a review about “additive manufacturing”, popularized under “3D printing”, and takes an inventory of the tests and metrological needs that the technology generates. It defines additive manufacturing and presents the materials used, the significance and the brakes of the technology, and application areas. It also lists and describes in detail the principle of the seven categories of processes that the technology counts.

Key words

additive manufacturing
3d printing
tests
metrology