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(43KB)
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Accelerated Pulsitile Fatigue Testing of Ni-Ti Coronary Stents
As Published in Proceedings of SMST-97: The Second International Conference on Shape Memory and Superelastic Technologies
Richard Glenn, Jeff Lee
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Ni-Ti coronary stents were fatigue tested in a 37 degrees Celsius saline solution using an accelerated circumferential pulsitile method to simulate the compliance of coronary arteries. Stents were inspected using a Scanning Electron Microscope both before and after fatigue testing to compare any changes in surface characteristics. Load versus deflection testing was also performed before and after fatigue testing to compare any changes in stiffness of the stents. The thirty Ni-Ti stents out performed the ten stainless steel control stents in fatigue testing to 100 million cycles, and performed as well as the thirty Ni-Ti controls used for mechanical evaluation.
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Relevant:
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Dental Wear Simulator
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(2000KB)
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Direct Strain Measurement Method Using an Endoscope
As Presented at the Society for Biomaterials 2002 Annual Meeting
Kent S. Vilendrer
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The use of bench-top test systems to perform long term durability studies on new vascular implant designs has given rise to various techniques for measuring and controlling the applied strains applied to the tested devices. Vascular prostheses such as stent and stent/grafts undergo a number of different strain conditions in-vivo including:
Radial Strain resulting from the applied diastolic and diastolic blood pressure,
Bending due to heart/limb movement,
and Radial Point Loading due to limb motion or impact.
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Relevant:
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Dental Wear Simulator
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(90KB)
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Dynamic Simulation Machine for Measurement of Knee Mechanics and Intra-Articular Pressures
J.L Pavlovic, S.J. Kirstukas, H. Touchi, J.E. Bechtold, R.B. Gustilo
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Total knee prostheses have been designed with the goal of maximizing tibiofemoral and patellofemoral contact areas to avoid high pressures causing excessive wear, while minimizing constraints to avoid overloading fixation interfaces. Surgical procedures have been used to alleviate abnormal knee joint loading. To determine the effectiveness of these designs and procedures, knee motion and pressure patterns must be measured under dynamic conditions. A multiple-input dynamic loading system is needed to enable accurate evaluation of knee mechanics.
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Relevant:
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Dental Wear Simulator
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(155KB)
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Effects of Successive ACL Transection, Medial Meniscectomy, and Total Meniscectomy on Knee Kinematics During Simulated Walking
J.L. Pavlovic, S.J. Kirstukas, O. Chow, H. Touchi, J.E. Bechtold, R.B. Gustilo
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An in-vitro study was performed to measure the kinematics of cadaver knees with no abnormality (N), ACL deficiency (ACL-), ACL- with medial meniscectomy (MM), and ACL- with total meniscectomy during simulated walking. This study was undertaken to study the effect of ligament and meniscus injury on knee kinematics.
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Relevant:
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Dental Wear Simulator
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(312KB)
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Fatigue & Fracture Testing
As published in Advanced Materials & Processes magazine's April, 2003 Issue
Kirk Biegler & Ric Carreras
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A system driven by a moving-magnet linear motor provides developers with an alternative to other technologies for many tension or bend-to-failure, fracture toughness, high-cycle fatigue, or crack-growth testing applications.
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Relevant:
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Dental Wear Simulator
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(67KB)
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Finite Element Analysis for the Design of Nitinol Medical Devices
As Published in the Proceedings of SMST-2000: The Third International Conference on Shape Memory & Superelastic Technologies
Nuno Rebelo and Michael Perry
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Finite element modeling and analysis can greatly reduce testing and time to market by allowing the designer to computer test his product in advance of any prototypes. Algorithms have been developed by HKS, Inc., and are used in its ABAQUS finite element modeling software allowing for accurate predictive finite element analysis of nickel-titanium alloys (Nitinol). Nitinol alloys have extremely complex but highly attractive mechanical behavior for medical applications not only for its mechanical properties but also for its bio-compatibility. Since its discovery and first fabrication Nitinol alloys have come to be used in a myriad of unique ways.
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Relevant:
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Dental Wear Simulator
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(113KB)
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Fracture of Filled Epoxy Molding Compound Compact Tension Specimens
V.H. Kenner, Kenneth K.C. Lau, Suresh K. Chengalva
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This paper reports results of fracture research performed on Bose ESG's ScopeTest system at Ohio State University. The temperatures examined ranged from -93 degrees C to 150 degrees C, and over this range the fracture toughness increases gradually with temperature to the neighborhood of 100 degrees C and then diminishes rapidly as the glass transition temperature is exceeded. The data are compared favorably with earlier results from 3-point-bend specimens. Steady state crack propagation was observed and analyzed. Some observations on the effect of loading rate and sensitivity of the results to specimen cure are also made.
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Relevant:
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Dental Wear Simulator
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(58KB)
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Material Testing Systems Optimized by the Use of Moving Magnet Linear Motors
Kirk Biegler, ElectroForce Systems Group, Bose Corporation
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Significant advances in linear motor design accomplished by the product development teams of the Bose Corporation and the then EnduraTEC Systems Corporation (now the ElectroForce Systems Group of Bose), now allow for the development of high performance material test systems. This technology has been introduced in a new product family, the ElectroForce® Series.
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Relevant:
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Dental Wear Simulator
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(90KB)
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Microtester Facility at The Ohio State University
Published in SRC Technical Findings
V.H. Kenner, K.C. Lau
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This report details the development of a miniature mechanical test facility developed to study materials issues associated with electronic packaging. A small test machine was designed in conjunction with ElectroForce Systems. A thermal chamber was designed and fabricated which permits testing to temperatures as high as 150 degrees C. The facility is completed with microscopic video capability so that test specimens may be continuously observed. Ohio State University is currently using the facility to gather fracture toughness data on molding compounds using small compact tension specimens.
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Relevant:
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Dental Wear Simulator
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(502KB)
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New Technology for Dynamic Testing of Elastomeric Materials
ElectroForce Systems Group, Bose Corporation
Kirk Biegler & Ric Carreras, Bose Corporation
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The ElectroForce® Series of test instruments represents a revolutionary concept in dynamic testing, bridging the gap between traditional servo-hydraulic and DMTA technologies. Typical test configurations and example data will be presented for a number of dynamic tests including; DMA, Stress relaxation, Hyper-elastic property generation, Fatigue and Crack Growth.
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Relevant:
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Dental Wear Simulator
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(416KB)
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The Energy Efficiency of the ElectroForce Series
ElectroForce Systems Group, Bose Corporation
Kent S. Vilendrer
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While much of focus of the ElectroForce Series of test instruments is directed at their performance, precision and durability, they also represent an extremely energy efficient alternative to conventional servohydraulic test systems. The electromagnetic linear motor of the ELectroForce generates linear force using a direct energy conversion, representing an advantage over traditional servohydraulics, which require several energy conversions (electrical to mechanical, mechanical to fluid power, and fluid power to mechanical) to power the system.
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Relevant:
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Dental Wear Simulator
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(260KB)
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Verification of the ElectroForce Test Instrument for Dynamic Mechanical Characterization of Materials
Kirk Biegler, ElectroForce Systems Group, Bose Corporation
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The ElectroForce® Series of material test systems is the result of significant advances in linear motor design from the product development teams of Bose® Corporation and then EnduraTEC Systems Corporation (now the ElectroForce Systems Group of Bose). This paper presents data on a variety of elastic and visco-elastic materials that shows the ElectroForce 3200 is an excellent instrument for dynamic mechanical characterization (DMC) of viscoelastic materials up to 200 hz and provides a wide range of benefits over traditional test instruments.
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Relevant:
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Dental Wear Simulator
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ElectroForce Systems Group