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You searched on: Author: nathanael heckert

Displaying records 21 to 30 of 51 records.
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21. Single fiber tensile properties measured by the Kolsky bar using a direct fiber clamping method
Published: 6/1/2013
Authors: Jae Hyun Kim, Nathanael A Heckert, Walter G McDonough, Kirk D Rice, Gale Antrus Holmes
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914325

22. Toward the Development of a High Strain Rate Testing Standard for Advanced Fibers
Published: 5/24/2013
Authors: Gale Antrus Holmes, Jae Hyun Kim, Nathanael A Heckert, Walter G McDonough, Stefan D Leigh, Kirk D Rice
Abstract: The use of advanced fibers in applications where they are subjected to extremely energetic events has necessitated the need to develop measurement tools that quantify their properties at high strain rates (HSR). The split Hopkinson tension bar (SHTB ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913501

23. An Interlaboratory Investigation of the Effect of Material Granularity and Sample Processing on Measurement Variability: Nutritional Elements in Cereals
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7927
Published: 5/9/2013
Authors: Katrice A Lippa, Laura J Wood, Stefan D Leigh, Nathanael A Heckert
Abstract: This interlaboratory study was uniquely designed to determine the effects of material granularity and sample processing techniques on the measurement variability (i.e. precision) of nutritional elements in various cereal materials. Participants w ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911835

24. Effects of fiber gripping methods on single fiber tensile tests: Parametric statistical analyses of tensile strengths and failure strains
Published: 5/9/2013
Authors: Jae Hyun Kim, Nathanael A Heckert, Walter G McDonough, Kirk D Rice, Gale Antrus Holmes
Abstract: The Kolsky bar test has been widely used in measuring material response under high strain rate conditions. Initial experiments in the literature applying this test to measure single fiber properties for fibers used in soft body armor with the Kolsky ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913211

25. Effects of fiber gripping methods on the single fiber tensile test: I. Non parametric statistical analysis
Published: 2/15/2013
Authors: Jae Hyun Kim, Nathanael A Heckert, Stefan D Leigh, Haruki Kobayashi, Walter G McDonough, Kirk D Rice, Gale Antrus Holmes
Abstract: Single fiber tensile tests using two different gripping methods were carried out on various fiber lengths. One method (the glue-tab grip) consists of mounting a fiber onto a rigid tab as specified in ASTM C1557-03 using an adhesive, while the other ( ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910750

26. Breakfast Cereal Sampling Study for Nutritional Elements
Published: 2/5/2013
Authors: Laura J Wood, Katrice A Lippa, Melissa Meaney Phillips, Catherine A Rimmer, Nathanael A Heckert, Stefan D Leigh, Amanda J Moors, Rebecca S Pugh
Abstract: The National Institute of Standards and Technology (NIST) has established a Dietary Supplement Laboratory Quality Assurance Program (DSQAP) in collaboration with the National Institutes of Health Office of Dietary Supplements (NIH-ODS). The DSQAP de ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912364

27. A Bayesian Quantitative Nondestructive Evaluation (QNDE) Approach to Estimating Remaining Life of Aging Pressure Vessels and Piping
Published: 1/1/2013
Authors: Jeffrey T Fong, William F Guthrie, James J Filliben, Nathanael A Heckert
Abstract: In this paper, we use a Bayesian quantitative nondestructive evaluation (QNDE) approach to estimating the remaining life of aging structures and components. Our approach depends on in-situ NDE measurements of detectable crack lengths and crack g ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913221

28. A Stochastic and Local Theory of Fatigue for Aging Pressure Vessels and Piping
Published: 11/4/2012
Authors: Jeffrey T Fong, Nathanael A Heckert, James J Filliben
Abstract: We begin with a review of the fatigue design methodology for new pressure vessels and piping, based on both deterministic and stochastic approaches. We will then prove that the same methodology for estimating the remaining life of aging pressure ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912440

29. Composites Failure Criteria, Uncertainty Propagation, and Estimation of the A-Basis and B-Basis Design Allowables
Published: 7/7/2012
Authors: Jeffrey T Fong, Nathanael A Heckert, James J Filliben
Abstract: In a 2002 paper on a summary of the so-called World-Wide Failure Exercise by Hinton, Kaddour, and Soden (Composites Science and Technology, 62: 1725-1797), in which fourteen deterministic theories for predicting failure in composite laminates were "t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911072

30. Tensile behavior of single PPTA fibers measured by the Kolsky bar using the direct fiber clamping method
Published: 6/11/2012
Authors: Jae Hyun Kim, Nathanael A Heckert, Stefan D Leigh, Haruki Kobayashi, Walter G McDonough, Richard L. Rhorer, Kirk D Rice, Gale Antrus Holmes
Abstract: The Kolsky bar test has been widely used in measuring material behavior under high strain rate conditions. In particular, this methodology has been used to characterize the high strain rate behavior of polymer and polymer composites during ballistic ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910973



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