scholarly journals Characterization of a Reference Test Setup for the Development of HPEM Standards

2021 ◽  
Vol 3 (1) ◽  
pp. 3-6
Author(s):  
Thorsten R. Pusch ◽  
Michael Suhrke ◽  
Benjamin Jorres
Keyword(s):  
Reference Test ◽  
Test Setup

A reference test setup and comparison between different HPEM testing schemes

2020 ◽  
Author(s):  
Tomas Hurtig ◽  
Thorsten Pusch ◽  
Martin Schaarschmidt ◽  
Mattias Elfsberg ◽  
Niklas Wellander ◽  
...  
Keyword(s):  
Reference Test ◽  
Test Setup

scholarly journals Analytical Investigation on the Effect of Test Setup on Bond Strength

CivilEng ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 14-34
Author(s):  
Konstantinos Tsiotsias ◽  
Stavroula J. Pantazopoulou
Keyword(s):  
Bond Strength ◽  
Pullout Test ◽  
Analytical Investigation ◽  
Strength Increase ◽  
Confining Stress ◽  
Direct Tension ◽  
Bond Slip ◽  
Test Setup ◽  
Long Time

Experimental procedures used for the study of reinforcement to concrete bond have been hampered for a long time by inconsistencies and large differences in the obtained behavior, such as bond strength and mode of failure, depending on the specimen form and setup used in the test. Bond is controlled by the mechanics of the interface between reinforcement and concrete, and is sensitive to the influences of extraneous factors, several of which underlie, but are not accounted for, in conventional pullout test setups. To understand and illustrate the importance of specimen form and testing arrangement, a series of computational simulations are used in the present work on eight distinct variants of conventional bar pullout test setups that are used routinely in experimental literature for the characterization of bond-slip laws. The resulting bond strength increase generated by unaccounted confining stress fields that arise around the bar because of the boundary conditions of the test setup is used to classify the tests with respect to their relevance with the intended use of the results. Of the pullout setups examined, the direct tension pullout test produced the most conservative bond strength results, completely eliminating the contributions from eccentricity and passive confinement.

On the Characterization of Nonlinearities in Assembled Structures

2020 ◽  
Vol 142 (5) ◽  
Author(s):  
Scott A. Smith ◽  
Matthew R. W. Brake ◽  
Christoph W. Schwingshackl
Keyword(s):  
Model Validation ◽  
Dynamic Testing ◽  
Experimental Studies ◽  
Standard Test ◽  
Nonlinear Structures ◽  
Test Setup

Abstract This work refines a recently formalized methodology proposed by D.J. Ewins consisting of ten steps for model validation of nonlinear structures. This work details, through a series of experimental studies, that many standard test setup assumptions that are made when performing dynamic testing are invalid and need to be evaluated for each structure. The invalidation of the standard assumptions is due to the presence of nonlinearities, both known and unrecognized in the system. Complicating measurements, many nonlinearities are currently characterized as constant properties instead of variables that exhibit dependency on system hysteresis and actuation amplitude. This study reviews current methods for characterizing nonlinearities and outlines gaps in the approaches. A brief update to the CONCERTO method, based on the accelerance of a system, is derived for characterizing a system’s nonlinearities. Finally, this study ends with an updated methodology for model validation and the ramifications for modeling assemblies with nonlinearities are discussed.

scholarly journals Development and validation of a test facility for pivotal characterization of glaucoma drainage devices

2021 ◽  
Vol 7 (2) ◽  
pp. 743-746
Author(s):  
Stefan Siewert ◽  
Rudolf Guthoff ◽  
Frank Kamke ◽  
Swen Grossmann ◽  
Michael Stiehm ◽  
...  
Keyword(s):  
Mechanical Characterization ◽  
Circular Cross Section ◽  
Glaucoma Surgery ◽  
Volume Flow ◽  
International Standards ◽  
Test Facility ◽  
Test Setup ◽  
Glaucoma Drainage Devices

Abstract Implant devices for micro invasive glaucoma surgery (MIGS) are gaining increasing acceptance in clinical ophthalmic use. The implant requirements are defined in international standards, such as ANSI Z80.27-2014 and the 2015 Guidance for Industry and Food and Drug Administration Staff “Premarket Studies of Implantable Minimally Invasive Glaucoma Surgical (MIGS) Devices”. The exact fluid-mechanical characterization represents a crucial part of the development and approval of innovative implant devices for MIGS. The current work describes the development and preliminary validation of a versatile test facility for pivotal characterization of glaucoma drainage devices. The test setup enables a pressurization of test specimens by means of two water columns. For measurement of pressure and volume flow, a pressure transducer and a total of three liquid flow meters were implemented into the test setup. Validation was conducted by experimental pressureflow characterization of standardized tubes and a comparison to theoretical results according to Hagen Poiseuille's law for stationary laminar flow of a Newtonian fluid in a tube with a circular cross section. Ultrapure water at (35 ± 2) °C was used for the analyses. The developed test setup potentially enables pressure-flow characterization of test specimens in a wide flow range of 0 μl min-1 ≤ Q ≤ 5.000 μl min-1. The preliminary test facility validation showed a good agreement of measured and theoretical volume flow characteristics as a function of the pressure difference, in the currently investigated flow range of Q < 80 μl min-1. The developed test facility is suitable for pivotal in vitro characterization of glaucoma drainage devices. Future investigations will focus on the final validation of the whole flow range and on the use of the test facility for fluid-mechanical characterization of self-developed prototypes of glaucoma microstents as well as commercially available glaucoma drainage devices.

Influence of Mean and Peak Power on HPEM Susceptibility Tests of a Reference Test Setup

2021 ◽  
Author(s):  
Hanna Sundberg ◽  
Mattias Elfsberg ◽  
Tomas Hurtig ◽  
Sten E Nyholm
Keyword(s):  
Peak Power ◽  
Reference Test ◽  
Test Setup ◽  
Susceptibility Tests

A test setup for the characterization of far-infrared filters under cryogenic conditions

2006 ◽  
Author(s):  
Stephan M. Birkmann ◽  
Ulrich Grözinger ◽  
Jutta Stegmaier ◽  
Oliver Krause ◽  
Eckhard Pitz ◽  
...  
Keyword(s):  
Far Infrared ◽  
Test Setup ◽  
Cryogenic Conditions

Characterization of a resonant bending fatigue test setup for pipes

2011 ◽  
Vol 2 (3) ◽  
pp. 424-431
Author(s):  
Jonas Claeys ◽  
Jeroen Van Wittenberghe ◽  
Patrick De Baets ◽  
Wim De Waele
Keyword(s):  
Fatigue Test ◽  
Analytical Model ◽  
Stress Amplitude ◽  
Fatigue Tests ◽  
Steel Pipe ◽  
Bending Fatigue ◽  
High Frequencies ◽  
Test Setup ◽  
Bending Fatigue Test

This paper discusses the resonant bending fatigue test setup designed at laboratory Soete forfull-scale fatigue tests on pipes. Following an enumeration of other types of fatigue test setups an attempt ismade to characterise the resonant bending machine. The characterisation is obtained by conductingdifferent tests on a steel pipe of grade API X65. Concordance between measured and calculated stressesand influence of excentre position on stress amplitude is discussed. High frequencies and small powerinput make this test setup very effective. The analytical model correctly predicts the measured stresses anda stress versus excentre curve is obtained. However not yet fully defined, it gives a first indication for theexcentre position when preparing for a fatigue test.

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