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Search Publications by: Raymond L. Santoyo (Fed)

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Displaying 1 - 21 of 21

Influence of Machine Anvil Wear on Charpy Test Results

May 12, 2020
Author(s)
Enrico Lucon, Raymond L. Santoyo
We investigated the influence of the state of wear of Charpy machine anvils on test results by performing impact tests on NIST specimens of three energy levels with a machine equipped with new anvils (compliant with both ASTM E23 [1] and ISO 148-2 [2]) and

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

Evaluation of Bias for Two Charpy Impact Machines Using the Same Instrumented Striker

May 1, 2011
Author(s)
Christopher N. McCowan, Enrico Lucon, Raymond L. Santoyo
Two Charpy machines were used to test NIST verification specimens at three energy levels: low energy (≈ 15 J at -40°C), high energy (≈ 100 J at -40°C) and super-high energy (≈ 240 J at room temperature). The study evaluates the differences observed for the

Evaluation Specimens for Izod Impact Machines (SRM 2115): Report of Analysis

October 1, 2006
Author(s)
Thomas A. Siewert, Jolene Splett, Raymond Santoyo
In the past few years, we have received a number of requests for verification specimens for Izod impact machines, similar to what we offer for Charpy impact machines. Although there are similarities between Izod and Charpy impact testing, there are some

Failure Analysis of the WWVB Tower

August 1, 2002
Author(s)
Joseph D. McColskey, Christopher N. McCowan, Raymond L. Santoyo
A failure analysis was conducted on the collapse of the NIST WWVB tower. The analysis included mechanical testing, chemical analysis, and metallographic examination of the failed part. We ascertained that the underlying reason for the collapse was fatigue