On the Effectiveness of the Dynamic Force Adjustment for Reducing the Scatter of Instrumented Charpy Results

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On the Effectiveness of the Dynamic Force Adjustment for Reducing the Scatter of Instrumented Charpy Results. / Lucon, Enrico; Scibetta, Marc (Peer reviewer).

0 ed. SCK CEN, 2008. 13 p. (SCK•CEN Reports; No. BLG-1059).

Research output: Report/bookBLG - Open reportpeer-review

Bibtex - Download

@book{85f3341be29542afbdfcb7a1704e1f83,
title = "On the Effectiveness of the Dynamic Force Adjustment for Reducing the Scatter of Instrumented Charpy Results",
abstract = "One of the key factors for obtaining reliable instrumented Charpy results is the calibration of the instrumented striker. An interesting alternative to the conventional static calibration recommended by the standards is the Dynamic Force Adjustment (DFA), in which forces and displacements are iteratively adjusted until equality is achieved between absorbed energies calculated under the test record (Wt) and measured by the machine encoder (KV). In this study, this procedure has been applied to the instrumented data obtained by 10 international laboratories using notched and precracked Charpy specimens, in the framework of a Coordinated Research Project (CRP8) of IAEA. DFA is extremely effective in reducing the between-laboratory scatter for both general yield and maximum forces. The effect is less significant for dynamic reference temperatures measured from precracked Charpy specimens using the Master Curve procedure, but a moderate reduction of the standard deviation is anyway observed. It is shown that striker calibration is a prominent contribution to the interlaboratory variability of instrumented impact forces, particularly in the case of maximum forces.",
keywords = "Instrumented Charpy tests, striker calibration, dynamic force adjustment, IAEA CRP8, between-laboratory scatter, dynamic Master Curve",
author = "Enrico Lucon and Marc Scibetta",
note = "RN - BLG-1059 AI - This work was performed during my secondment at NIST (National Institute of Standards and Technology) in Boulder, Colorado (USA), between June and August 2008. The contents of this report were submitted to Journal of ASTM International for publication on 28 August 2008. Score = 2",
year = "2008",
month = sep,
language = "English",
series = "SCK•CEN Reports",
publisher = "SCK CEN",
number = "BLG-1059",
address = "Belgium",
edition = "0",

}

RIS - Download

TY - BOOK

T1 - On the Effectiveness of the Dynamic Force Adjustment for Reducing the Scatter of Instrumented Charpy Results

AU - Lucon, Enrico

A2 - Scibetta, Marc

N1 - RN - BLG-1059 AI - This work was performed during my secondment at NIST (National Institute of Standards and Technology) in Boulder, Colorado (USA), between June and August 2008. The contents of this report were submitted to Journal of ASTM International for publication on 28 August 2008. Score = 2

PY - 2008/9

Y1 - 2008/9

N2 - One of the key factors for obtaining reliable instrumented Charpy results is the calibration of the instrumented striker. An interesting alternative to the conventional static calibration recommended by the standards is the Dynamic Force Adjustment (DFA), in which forces and displacements are iteratively adjusted until equality is achieved between absorbed energies calculated under the test record (Wt) and measured by the machine encoder (KV). In this study, this procedure has been applied to the instrumented data obtained by 10 international laboratories using notched and precracked Charpy specimens, in the framework of a Coordinated Research Project (CRP8) of IAEA. DFA is extremely effective in reducing the between-laboratory scatter for both general yield and maximum forces. The effect is less significant for dynamic reference temperatures measured from precracked Charpy specimens using the Master Curve procedure, but a moderate reduction of the standard deviation is anyway observed. It is shown that striker calibration is a prominent contribution to the interlaboratory variability of instrumented impact forces, particularly in the case of maximum forces.

AB - One of the key factors for obtaining reliable instrumented Charpy results is the calibration of the instrumented striker. An interesting alternative to the conventional static calibration recommended by the standards is the Dynamic Force Adjustment (DFA), in which forces and displacements are iteratively adjusted until equality is achieved between absorbed energies calculated under the test record (Wt) and measured by the machine encoder (KV). In this study, this procedure has been applied to the instrumented data obtained by 10 international laboratories using notched and precracked Charpy specimens, in the framework of a Coordinated Research Project (CRP8) of IAEA. DFA is extremely effective in reducing the between-laboratory scatter for both general yield and maximum forces. The effect is less significant for dynamic reference temperatures measured from precracked Charpy specimens using the Master Curve procedure, but a moderate reduction of the standard deviation is anyway observed. It is shown that striker calibration is a prominent contribution to the interlaboratory variability of instrumented impact forces, particularly in the case of maximum forces.

KW - Instrumented Charpy tests

KW - striker calibration

KW - dynamic force adjustment

KW - IAEA CRP8

KW - between-laboratory scatter

KW - dynamic Master Curve

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_90651

UR - http://knowledgecentre.sckcen.be/so2/bibref/5091

M3 - BLG - Open report

T3 - SCK•CEN Reports

BT - On the Effectiveness of the Dynamic Force Adjustment for Reducing the Scatter of Instrumented Charpy Results

PB - SCK CEN

ER -

ID: 231281