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Search Publications by: Steven P. Mates (Fed)

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Displaying 1 - 25 of 60

Effect of austenite fraction and stability on strength-hardening-ductility in additively manufactured 17-4 PH stainless steel containing nitrogen

June 30, 2023
Saadi Habib, Steven P. Mates, Fan Zhang, Mark R. Stoudt, James Zuback, Olaf Borkiewicz
Additively-manufactured (AM) 17-4 precipitation-hardening (PH) martensitic stainless steel (SS) built from nitrogen-atomized powder often retains a large volume fraction of austenite. The retained austenite lowers the yield strength compared to both

Dynamic Plasticity Model for Rapidly Heated 1045 Steel Up to 1000 degC

August 27, 2021
Steven Mates, Shengyen Li
The National Institute of Standards and Technology (NIST) developed an experimental technique to measure the dynamic flow stress of metals under rapid heating to study their time-dependent plastic response when heating times are short enough to interrupt

Considering the influence of heating rate, complex hardening and dynamic strain agingin AISI 1045 machining: experiments and simulations

July 16, 2021
Friedrich Bleicher, Christian Baumann, Stephan Krall, Steven P. Mates, Sibylle Herzig, Tim Alder, Norman Herzig
In the modelling of machining operations, constitutive models must consider the material behavior subject to high plastic strains, high strain rates, high temperatures and high heating rates. A new material model for AISI 1045, which captures time

Intercritical annealing to achieve a positive strain rate sensitivity of mechanical properties and suppression of plastic instabilities in multi-phase medium-Mn steels

October 29, 2020
Jake Benzing, William E. Luecke, Steven Mates, Dirk Ponge, Dierk Raabe, James Wittig
The present work investigates the room temperature tensile properties of a cold-rolled Fe-12Mn- 3Al-0.05C (% by mass) steel designed to have a multi-phase microstructure and positive strain rate sensitivities. An increase in intercritical annealing time

Dynamic Compression Strength of Ceramics: What was Learned from an Interlaboratory Round Robin Exercise

September 4, 2020
Jeffrey Swab, Wayne Chen, James Hogan, Hangjie Liao, Calvin Lo, Steven Mates, Christopher Meredith, John Pittari, Richard Rhorer, George Quinn
The dynamic compressive strength of a commercial alumina was determined by five participants using the Split-Hopkinson pressure bar (SHPB) method with a dumbbell-shaped specimen. Each participant used their own SHPB test apparatus and imaging set-up to

Dynamic Compression Tests of Alumina Dumbbells Using a Spherical Joint

December 19, 2019
Richard Rhorer, George D. Quinn, Steven Mates
The dynamic compressive strength of ceramic armor materials is difficult to obtain experimentally due to the sensitivity of fracture strength to even small bending stresses. In this work we introduce a spherical joint into a compression Kolsky bar to

Rate effects on transformation kinetics in a metastable austenitic stainless steel

November 15, 2017
Rakan Alturk, William E. Luecke, Steven Mates, A Araujo, K. S. Raghavan, Fadi Abu-Farha
In this study, the effects of strain rate on the mechanical properties and the strain-induced austenite-to-martensite transformation in 201 austenitic stainless steel (SS201) were investigated. This grade was selected as a low-cost stainless steel with

NIST Mini-Kolsky Bar: Historical Review

October 16, 2016
Richard L. Rhorer, Steven P. Mates, Jae H. Kim
The Society for Experimental Mechanics (SEM) has sponsored a series of technical paper sessions titled "Novel Testing Techniques" at their annual meetings. These sessions were organized by the Dynamic Material Properties Technical Division of SEM and

Towards Building Simulation Tools for Next Generation Soft Body Armour Testing Standards

September 18, 2016
Steven P. Mates, Amanda L. Forster, Michael A. Riley, Kirk D. Rice, Juliana Ivancik
Accurate simulation tools for soft body armour testing would vastly improve test designer's ability to optimize and refine standards by supplying quantitative information about the influence of test variables on test outcomes. Such tools would also

Opportunities for Inverse Analysis in Dynamic Tensile Testing

June 6, 2016
Steven P. Mates, Fadi Abu-Farha
Dynamic tensile testing using Kolsky Bar methods are used to assess crashworthiness of new structural materials needed for lightweight automotive design. High speed Digital Image Correlation (DIC) measurements routinely show that the strain experienced by

Inverse Method for Estimating Shear Stress in Machining

November 3, 2015
Timothy J. Burns, Steven P. Mates, Richard L. Rhorer, Eric P. Whitenton, Debasis Basak
An inverse method is presented for estimating the shear stress in the work material in the region of chip-tool contact along the rake face of the tool during orthogonal machining. The method uses an estimate of the temperature of the work material as it

Multi-scale measurement for tensile behaviors of glass fiber composites at high rate loading: Fiber fragmentation behaviors in epoxy resin

May 19, 2015
Jae Hyun Kim, Steven P. Mates, Nathanael A. Heckert, Walter G. McDonough, Gale A. Holmes
High strength and light weight composite materials used in various structural components of aviation and automotive applications deform under high rate loading conditions during collision. Since composite structures using continuous fibers are constituted

Dynamic Flow Stress Measurements for Machining Applications

December 19, 2014
Steven P. Mates, Eran Vax, Richard Rhorer, Michael B. Kennedy, Eric P. Whitenton, Stephen W. Banovic, Timothy J. Burns
Metals undergo a combination of rapid loading and rapid heating during normal and high speed machining processes. Constitutive models for these materials, however, generally lack any information regarding kinetics of thermally-induced transformations, such