Ross Meyer

University of California, Berkeley

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Oluwatomi A. Akindele

Lawrence Livermore National Laboratory

Jordan Sabella

University of California, Berkeley

Keenan Thomas

Lawrence Livermore National Laboratory

E. B. Norman

University of California, Berkeley

Howard A. Shugart

University of California, Berkeley

M. Lee

University of California, Berkeley

G. W. Leddicotte

Georgia Institute of Technology

Marcos Lugo

Liberty University

J.W. Winchester

Steris (United States)

Michelle Lee

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University of California, Berkeley

Lawrence Berkeley National Laboratory

Lawrence Livermore National Laboratory

Massachusetts Institute of Technology

Opera Software (Norway)

Mississippi State University

Oak Ridge National Laboratory

Universidade de São Paulo

Argonne National Laboratory

Auburn University

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Fatigue Behavior and Modeling for Thermoplastics

56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference (2015)

Ross Meyer Jutima Simsiriwong Marcos Lugo Nima Shamsaei

In this study, the cyclic behavior and the microstructure under cyclic loading of a semi-crystalline thermoplastic polyether ether ketone (PEEK) are investigated. Macroscopic strain life experiments under uniaxial loading condition were conducted at strain amplitudes ranging from 0.02 mm/mm to 0.04 mm/mm and at ambient temperature. Scanning electron microscopy (SEM) analysis was performed on fatigue specimens to examine crack incubation sites and microstructural inclusions responsible for incubating fatigue cracks. Other microstructural inclusion properties including inclusion type (pore or particle), inclusion size, and nearest neighbor distance of inclusions were also obtained. Based on the experimental results, the strain-based fatigue model was employed to obtain strain-life fatigue properties and e-N fatigue curves of PEEK.

10.2514/6.2015-0895

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Fast neutron activation of ubiquitous materials

Applied Radiation and Isotopes (2022)

M. Lee E. B. Norman Oluwatomi A. Akindele Keenan Thomas P. V. Guillaumon

Nuclear explosions expose ubiquitous materials to large numbers of neutrons, producing a variety of radioactive isotopes. To simulate such phenomena from both fission and thermonuclear explosions, we irradiated 29 different targets with approximately 3 and 14 MeV neutrons and measured the beta-delayed gamma rays using germanium detectors. For each neutron energy, the expected radioisotopes, half-lives, and gamma ray energies were deduced. From measurements of the ratios of activities of the radionuclides produced by neutron irradiations, we were able to identify several materials that are particularly sensitive to the neutron energy spectra.

Thermonuclear Fusion

Semiconductor detector

10.1016/j.apradiso.2022.110098

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DETERMINATION OF OXYGEN IN OXIDE FILMS BY NEUTRON ACTIVATION ANALYSIS

J.W. Winchester Ross Meyer L.C. Bate G. W. Leddicotte

Preliminary experiments were conducted to evaluate the use of the nuclear reactions Li/sup 6/ (n, alpha )H/sup 3/ and O/sup 16/(H/sup 3/,n) F/sup 18/ to determine the thickness of oxide films on metals. Sheets of thin paper and of aluminum, imbedded in powdered LiF, were irradiated with pile neutrons at a flux of 6 x 10/sup 11/ n/cm/sup 2//sec and counted with an end-window proportional counter. A saturation activity of 1.87 hr F/sup 18/ of 150 dis/min per microgram of oxygen was observed in the paper, but radioactivity due to impurities masked F/sup 18/ in the aluminum. It is concluded that a 1 A (0.01 mu gm/cm/sup 2/) oxide film thickness may be measured by a neutron irradiation at a flux of 10/sup 14/ n/cm/sup 2//sec but chemical separation of induced radioactivity from the bulk metal is essential. (auth)

Saturation (graph theory)

10.2172/4166598

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Fast Neutron Activation of Ubiquitous Materials

Bulletin of the American Physical Society (2020)

Michelle Lee Oluwatomi A. Akindele Keenan Thomas Pedro Guillamon Jordan Sabella

Neutron Activation Analysis

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