Publications

Displaying 126 - 150 of 186

Impact Toughness Modification of NIST Low-Energy Charpy Verification Specimens for Testing at Room Temperature

March 27, 2017

Author(s)

Enrico Lucon, Raymond L. Santoyo

The possibility for NIST to certify Charpy reference specimens for testing at room temperature (21 °C ± 1 °C) instead of −40 °C has been investigated in a previous study, in which a slightly increased likelihood of specimen jamming was observed at the low

COMPARISON OF J-RESISTANCE MEASUREMENT METHODS ON CLAMPED SINGLE-EDGE NOTCHED TENSION SPECIMENS

November 10, 2016

Author(s)

Dash Weeks, David T. Read, Enrico Lucon, Jeffrey W. Sowards, Ross A. Rentz

This paper reports an extension of a previous study that compared methods of evaluating J by the crack mouth opening displacement and by surface strain gradients. In that study, the strain data were obtained by use of traditional surface-mounted strain

Instrumented impact tests on miniaturized Charpy specimens of additively manufactured (AM) Ti6Al4V

September 29, 2016

Author(s)

Enrico Lucon, Nikolas W. Hrabe

An investigation on the impact toughness properties of wrought and additively-manufactured (AM) Ti-6Al-4V was conducted at NIST Boulder, by means of instrumented impact tests on miniaturized Charpy specimens. Full transition curves for absorbed energy and

A Comparative Analysis of NIST Charpy Machines and Internal Reference Materials

August 23, 2016

Author(s)

Enrico Lucon, Raymond L. Santoyo

This report documents the results of a series of comparative analyses which were conducted at on the Charpy machines located at NIST in Boulder, Colorado. The analyses were performed both on historical data, collected over a period of more than 20 years

Certification of NIST Room Temperature Low-Energy and High-Energy Charpy Verification Specimens

December 2, 2015

Author(s)

Enrico Lucon, Christopher N. McCowan, Raymond L. Santoyo

The feasibility of certifying Charpy reference specimens for testing at room temperature (21 °C ± 1 °C) instead of −40 °C was demonstrated at NIST by performing 130 room-temperature tests from five low-energy and four high-energy lots of steel on the three

NIST Room Temperature Low-Energy and High Energy Verification Specimens: Feasibility Study

October 21, 2015

Author(s)

Enrico Lucon, Christopher N. McCowan, Raymond L. Santoyo

The feasibility of certifying Charpy reference specimens (SRMs) for testing at room temperature (RT, 21 °C ± 1 °C) instead of -40 °C was demonstrated at NIST by performing 130 RT tests from nine low-energy and high-energy lots on the three master machines

OVERVIEW OF NIST ACTIVITIES ON SUB-SIZE AND MINIATURIZED CHARPY SPECIMENS: CORRELATIONS WITH FULL-SIZE SPECIMENS AND VERIFICATION SPECIMENS FOR SMALL-SCALE PENDULUM MACHINES

July 19, 2015

Author(s)

Enrico Lucon, Christopher N. McCowan, Raymond L. Santoyo

NIST in Boulder Colorado investigated the correlations between impact test results obtained from standard, full-size Charpy specimens (CVN) and specimens with reduced thickness (sub-size Charpy specimens, SCVN) or reduced or scaled cross-section dimensions

Measurement of Dynamic Impact Toughness on Impact-Tested Precracked Charpy Specimens

June 18, 2015

Author(s)

Enrico Lucon

The Fraunhofer Institute for Mechanics of Materials (IWM, Freiburg, Germany) and the Materials Testing Institute University of Stuttgart (MPA Stuttgart, Germany) have recently launched a joint collaboration project titled Dynamic Mastercurves II (MC-Dyn

Certified KLST Miniaturized Charpy Specimens for the Indirect Verification of Small-Scale Impact Machines

April 28, 2015

Author(s)

Enrico Lucon, Christopher N. McCowan, Raymond L. Santoyo, Jolene D. Splett

Small specimen test techniques are becoming ever more popular as the need increases to characterize mechanical properties by use of the smallest possible amount of material, due to various restrictions on material availability, irradiation, testing space

Establishment of an International Scale for Instrumented Charpy Testing: comparison between NIST and LNE

April 1, 2015

Author(s)

Enrico Lucon, Christopher N. McCowan, Raymond L. Santoyo, Stephane Lefrancois

As a contribution to the establishment of an international scale for instrumented Charpy testing, aimed at ensuring that impact forces are obtained more accurately, NIST and Laboratoire National de métrologie et dEssais (LNE, France) have participated in

Tensile Properties of Commercially Pure, High-Purity and Ultra-High-Purity Iron: Results of an International Round-Robin

April 1, 2015

Author(s)

Enrico Lucon, Kenji Abiko, Marlies Lambrecht, Birgit Rehmer

The room temperature tensile properties of iron with different purity levels (commercially pure, high-purity, and ultra-high-purity) were characterized at different strain rates in the framework of an international Round-Robin involving four laboratories

Determination of the compliance of NIST Charpy Impact Machines

February 10, 2015

Author(s)

Enrico Lucon

The compliance of a Charpy impact machine, CM, can be measured by means of a low-blow elastic test on an unnotched Charpy-type specimen, provided an instrumented striker is used. The resulting force/time and force/displacement test records can be analyzed

Impact Characterization of 4340 and T200 Steels by Means of Standard, Sub Size and Miniaturized Charpy Specimens

February 10, 2015

Author(s)

Enrico Lucon, Christopher N. McCowan, Raymond L. Santoyo

In this investigation, we performed instrumented Charpy tests in order to characterize the impact properties of three steels, used by NIST for the production of Charpy reference specimens (4340 quenched and tempered with two energy levels, and T200 18Ni

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