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Search Publications by: Enrico Lucon (Fed)

Displaying 101 - 125 of 186

Charpy Interlaboratory Comparison between NIST and the Beijing Institute of Metrology (BIM)

September 12, 2019

Author(s)

Enrico Lucon, Raymond L. Santoyo

The Beijing Institute of Metrology (BIM, China) and NIST have participated in an interlaboratory comparison, in which reference Charpy specimens of three energy levels were tested. Each laboratory tested 75 specimens supplied by the other institute, 25 per

Use and Validation of the Slope Determination by the Analysis of Residuals (SDAR) Algorithm

June 25, 2019

Author(s)

Enrico Lucon

The Slope Determination by the Analysis of Residuals (SDAR) algorithm has recently been standardized in ASTM E3076-18 for the determination of the slope in the linear region of a test record. It offers an automated and objective linear-fitting method

Influence of Shear Lip Symmetry on the Fracture Behavior of Charpy Specimens

January 31, 2019

Author(s)

Enrico Lucon

An investigation was conducted at the National Institute of Standards and Technology (NIST) on the influence of shear lip symmetry on the fracture behavior (absorbed energy and data scatter) of Charpy specimens at different energy levels, corresponding to

Effects of internal porosity and crystallographic texture on Charpy impact energy of Electron Beam Melting (EBM) titanium alloy (Ti-6Al-4V)*

November 3, 2018

Author(s)

Nikolas W. Hrabe, Ryan M. White, Enrico Lucon

The effects of internal porosity and crystallographic texture on miniaturized Charpy absorbed energy behavior of electron beam melting (EBM) titanium alloy (Ti-6Al-4V) are shown through investigation of material in two heat treatment conditions (As-Built

Effect of Charpy Striker Configuration on Low- and High-Energy NIST Verification Specimens

September 12, 2018

Author(s)

Enrico Lucon, Jolene D. Splett

Charpy machines can be equipped with strikers having two different configurations, corresponding to an edge radius of 2 mm or 8 mm. Both striker types are covered by ASTM E23 and ISO 148-1. The effect of striker type on Charpy absorbed energy has been

Investigations on SI-Traceable Dynamic Calibration of Instrumented Charpy Strikers

May 14, 2018

Author(s)

Akobuije D. Chijioke, Nicholas A. Vlajic, Enrico Lucon, Edward C. Mulhern

In this Technical Note, we report on investigations toward an SI-traceable dynamic calibration of instrumented Charpy strikers, performed at NIST from January to December 2017. Although Charpy tests are few-millisecond-duration events in which dynamic

ASTM E08.07.09 Analytical Round-Robin on the Use of DC Electrical Potential Difference for the Measurement of Crack Size in Ductile Fracture Testing

April 26, 2018

Author(s)

Enrico Lucon

The Direct Current Electrical Potential Difference, DCEPD, technique has been used for many years in fatigue and fracture testing for monitoring crack propagation in metallic materials. The principle of DCEPD methods is that, when a constant current flows

New Software for the Statistical Analysis and Qualification of NIST Charpy Verification Specimen Lots

April 24, 2018

Author(s)

Enrico Lucon

New software, in the form of Microsoft Excel 2016 spreadsheets, has been created for the analysis and qualification of Charpy Verification Lots, to be used by personnel of the Charpy Verification Program at NIST in Boulder, Colorado. The new spreadsheets

Instrumented impact testing of miniaturized Charpy specimens of AM Ti-6Al-4V

April 11, 2018

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

Cost-Effective Alternatives to Conventional Charpy Tests for Measuring the Impact Toughness of Very-High-Toughness Steels

January 24, 2018

Author(s)

Enrico Lucon

For modern plate steels exhibiting high toughness and ductility, the conventional Charpy test is ostensibly stretched beyond its limits of applicability. Impact tests yield absorbed energy values in excess of 300 J - 400 J, which are associated with

Instrumented impact testing of miniaturized Charpy specimens of AM Ti 6Al 4V

November 16, 2017

Author(s)

Enrico Lucon, Nikolas W. Hrabe

Effects of Powder Oxidation on Impact Toughness of Electron Beam Melt Ti-6Al-4V

August 25, 2017

Author(s)

Edward J. Garboczi, Enrico Lucon, William Grell, Z Loftus, Maciej Kumosa, E Solis-Ramos, Paul Predecki, E Clark

Powder quality in additive manufacturing (AM) electron beam melt (EBM) of Ti-6Al-4V components is crucial in determining the critical material properties of the end item. In this study, we report on the effect of powder oxidation on Charpy impact energy of

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