highlight2004

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APMP ad-hoc WGMM
Gun Woong Bahng Korea Research Institute of
Standards Science
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APMP ad-hoc WGMM

• Pilot Study
• ? Flexural strength measurement of Ceramics
• - Finished in 2005
• - Joint work with ANMET, VAMAS
• - Final report is available
• Tensile strength of Steel
• - Report of results finished
• - BAM, NPL were invited and participated
• - Final report is under preparation
• Difficulties Only a few institutes have
  capabilities in
• materials metrology area.

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APMP ad-hoc WGMM

• CIPM ad-hoc WGMM
• ? Established in 2005
• - Proposed by KRISS, Oct. 2004
• - Endorsed by CIPM in 2005
• Participants
• - NIST, NPL, PTB, BAM, CENAM, NMIJ, KRISS,
  LNE, NIMS,
• CSIR-NML, IRMM, BIPM, IMGC, CCQM, ILAC
• - Chaired by Dr. Seton Bennet, CIPM member
• Meetings held
• - NPL(May 2006), NIST (Dec 2006), LNE (May
  2007).
• - Dr. Graham Sims prepared final report to
  CIPM

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APMP ad-hoc WGMM

• Scope
• - Liquid, biological materials are out of scope
• - Solid, engineered, structural or functional
  materials
• Materials Properties
• 1. Inherent Properties
• e.g. Youngs modulus, Thermal properties,
  Magnetic
• properties, etc.
• 2. Procedural Properties
• e.g. Tensile strength, Hardness, Corrosion,
  Fatigue,
• Fracture strength, etc.

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APMP ad-hoc WGMM

• Calibration always goes together with
  uncertainty
• ? traceability by CRM with uncertainty,
• ? calibration of materials testing procedure
  itself is
• necessary
• Related Working Groups
• - CCM WG Hardness, WG Density
• - CCEM
• - CCT WG 9, Thermophysical properties
• - CCQM, several WGs

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APMP ad-hoc WGMM
Metrological traceability is defined as
property of a measurement result whereby the
result can be related to a stated reference
through a documented unbroken chain of
calibrations, each contributing to the
measurement uncertainty where for this
definition, note 1 states that A stated
reference can be a definition of a measurement
unit through its practical realization, or a
measurement procedure including the measurement
unit for a non-ordinal quantity, or a
measurement standard. The re-definition allows
wider options for traceability such as that used
by the JCTLM in assessing reference materials.
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APMP ad-hoc WGMM
Reference material (RM) - Material or substance,
one or more of whose property values are
sufficiently homogeneous and well established to
be used for the calibration of an apparatus, the
assessment of a measurement method, or for
assigning values to materials.
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APMP ad-hoc WGMM
Certified reference material (CRM) - Reference
material, accompanied by a certificate, one or
more of whose property values are certified by a
procedure, which establishes its traceability to
an accurate realization of the unit in which the
property values are expressed, and for which each
certified value is accompanied by an uncertainty
at a stated level of confidence.
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APMP ad-hoc WGMM

• Trends
• - General recognition of widening coverage by
  CIPM of measurement areas outside initial SI
  responsibilities
• - the need for, and benefits of, mutual
  recognition applies equally strongly to material
  property determination.
• - material properties are already covered in key
  and supplementary comparisons.
• - Metrology for the characterization of
  nano-material is a new emerging area

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APMP ad-hoc WGMM
Calibration according to U budget
Calibration using CRM
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APMP ad-hoc WGMM
NMI Uncertainty is obtained through uncertainty
budget U from measuring device,
procedure, materials ? International
comparison Equivalency ? Product primary
CRM with uncertainty CRM producer ? U of
machine U of test result U of primary CRM
? U of CRM U of machine U of test
results Industry ? U of machine U of CRM
U of test results ? U of certification U
of machine U of test results
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APMP ad-hoc WGMM
No guarantee on equivalence and comparability of
test data. Most of other procedural properties
are in the same situation except hardness.
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APMP ad-hoc WGMM

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APMP ad-hoc WGMM

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APMP ad-hoc WGMM
Required precision of materials properties at
different stages of design
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APMP ad-hoc WGMM
Range of required properties
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APMP ad-hoc WGMM

• 5 task groups
• -Mechanical, thermophysical, composition and
  microstructural, functional, electrochemical
• Survey for property evaluation
• Mechanical There is a clear need to demonstrate
  for this intrinsic property that acceptable
  uncertainties can be obtained. It is proposed
  that this area should be used for a pilot study.

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APMP ad-hoc WGMM

Materials Metrolgy is an another challenge for
metrologists.
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APMP ad-hoc WGMM
To CIPM MoU between VAMAS, ISO/IEC, ILAC, CIPM -
WGMM Review again in 3-4 years Joint committee
with CIPM, VAMAS, ILAC later? Sector
Stakeholders Discussions?? To CCs Materials WGs
within CCs Joint WGs between CCs To NMIs To VAMAS
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New bridge for better measurements
Thank you !