title: Experimental testing on free vibration behaviour for silicone rubbers proposed within lumbar disc prosthesis.
abstract: This research was focused on the damping capacity study of two types of silicone rubbers proposed as layers within total lumbar disc prostheses of ball-and-socket model. In order to investigate the damping capacity, the two silicone rubber types mainly differing by the molecular mass of polymeric matrix and the filler content, as was emphasized by scanning electron microscopy and differential scanning calorimetry, were subjected to free vibration testing. Using an adapted experimental installation, three kinds of damping testing were realised: tests without samples and tests with three samples of each type of silicone rubber (69 ShA and 99 ShA). The free vibration tests were performed at a frequency of about 6 Hz using a weight of 11.8 kg. The relative damping coefficient was determined by measuring of two successive amplitudes on the vibrogram and calculating of the logarithmic decrement. The test results with silicone rubber samples showed a relative damping coefficient of 0.058 and respectively 0.077, whilst test results without samples showed a relative damping coefficient of 0.042. These silicone rubbers were found to have acceptable damping properties to be used as layers placed inside the prosthetic components.
authors: "Gheorghe Asachi" Technical University of Iasi, Faculty of Mechanical Engineering, Department of Mechanical Engineering, Mechatronics and Robotics, 61-63 Bd. Dimitrie Mangeron, 700050 Iasi, Romania; "Gr. T. Popa" University of Medicine and Pharmacy of Iasi, Faculty of Medical Bioengineering, Department of Biomedical Sciences, 9-13 M. Kogalniceanu Street, 700454 Iasi, Romania. Electronic address: rotaruiuliana2000@gmail.com.
authors: Iuliana
authors: I
authors: Rotaru
authors: "Gheorghe Asachi" Technical University of Iasi, Faculty of Mechanical Engineering, Department of Mechanical Engineering, Mechatronics and Robotics, 61-63 Bd. Dimitrie Mangeron, 700050 Iasi, Romania.
authors: Carmen
authors: C
authors: Bujoreanu
authors: "Petru Poni" Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41 A, 700487 Iasi, Romania.
authors: Adrian
authors: A
authors: Bele
authors: "Petru Poni" Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41 A, 700487 Iasi, Romania.
authors: Maria
authors: M
authors: Cazacu
authors: "Gheorghe Asachi" Technical University of Iasi, Faculty of Mechanical Engineering, Department of Mechanical Engineering, Mechatronics and Robotics, 61-63 Bd. Dimitrie Mangeron, 700050 Iasi, Romania.
authors: Dumitru
authors: D
authors: Olaru
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D002152:Calorimetry, Differential Scanning; D006801:Humans; D008159:Lumbar Vertebrae / Q000502:physiology; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D008954:Models, Biological; D019736:Prostheses and Implants; D012826:Silicone Elastomers / Q000737:chemistry*; D059145:Total Disc Replacement / Q000295:instrumentation*; D014732:Vibration
chemical_list: D001672:Biocompatible Materials; D012826:Silicone Elastomers
keywords: DSC; Damping; Free vibration; Lumbar disc prosthesis; SEM; Silicone rubber