The Experts below are selected from a list of 12363 Experts worldwide ranked by ideXlab platform
Christof Hurschler - One of the best experts on this subject based on the ideXlab platform.
-
A rolling-gliding wear simulator for the investigation of Tribological Material pairings for application in total knee arthroplasty
BioMedical Engineering OnLine, 2010Co-Authors: Berna I Richter, Sven Ostermeier, Anke Turger, Berend Denkena, Christof HurschlerAbstract:Background Material wear testing is an important technique in the development and evaluation of Materials for use in implant for total knee arthroplasty. Since a knee joint induces a complex rolling-gliding movement, standardised Material wear testing devices such as Pin-on-Disc or Ring-on-Disc testers are suitable to only a limited extent because they generate pure gliding motion only. Methods A rolling-gliding wear simulator was thus designed, constructed and implemented, which simulates and reproduces the rolling-gliding movement and loading of the knee joint on specimens of simplified geometry. The technical concept was to run a base-plate, representing the tibia plateau, against a pivoted cylindrical counter-body, representing one femur condyle under an axial load. A rolling movement occurs as a result of the friction and pure gliding is induced by limiting the rotation of the cylindrical counter-body. The set up also enables simplified specimens handling and removal for gravimetrical wear measurements. Long-term wear tests and gravimetrical wear measurements were carried out on the well known Material pairings: cobalt chrome-polyethylene, ceramic-polyethylene and ceramic-ceramic, over three million motion cycles to allow Material comparisons to be made. Results The observed differences in wear rates between cobalt-chrome on polyethylene and ceramic on polyethylene pairings were similar to the differences of published data for existing Material-pairings. Test results on ceramic-ceramic pairings of different frontal-plane geometry and surface roughness displayed low wear rates and no fracture failures. Conclusions The presented set up is able to simulate the rolling-gliding movement of the knee joint, is easy to use, and requires a minimum of user intervention or monitoring. It is suitable for long-term testing, and therefore a useful tool for the investigation of new and promising Materials which are of interest for application in knee joint replacement implants.
-
a rolling gliding wear simulator for the investigation of Tribological Material pairings for application in total knee arthroplasty
Biomedical Engineering Online, 2010Co-Authors: Berna Richter, Sven Ostermeier, Anke Turger, Berend Denkena, Christof HurschlerAbstract:Material wear testing is an important technique in the development and evaluation of Materials for use in implant for total knee arthroplasty. Since a knee joint induces a complex rolling-gliding movement, standardised Material wear testing devices such as Pin-on-Disc or Ring-on-Disc testers are suitable to only a limited extent because they generate pure gliding motion only. A rolling-gliding wear simulator was thus designed, constructed and implemented, which simulates and reproduces the rolling-gliding movement and loading of the knee joint on specimens of simplified geometry. The technical concept was to run a base-plate, representing the tibia plateau, against a pivoted cylindrical counter-body, representing one femur condyle under an axial load. A rolling movement occurs as a result of the friction and pure gliding is induced by limiting the rotation of the cylindrical counter-body. The set up also enables simplified specimens handling and removal for gravimetrical wear measurements. Long-term wear tests and gravimetrical wear measurements were carried out on the well known Material pairings: cobalt chrome-polyethylene, ceramic-polyethylene and ceramic-ceramic, over three million motion cycles to allow Material comparisons to be made. The observed differences in wear rates between cobalt-chrome on polyethylene and ceramic on polyethylene pairings were similar to the differences of published data for existing Material-pairings. Test results on ceramic-ceramic pairings of different frontal-plane geometry and surface roughness displayed low wear rates and no fracture failures. The presented set up is able to simulate the rolling-gliding movement of the knee joint, is easy to use, and requires a minimum of user intervention or monitoring. It is suitable for long-term testing, and therefore a useful tool for the investigation of new and promising Materials which are of interest for application in knee joint replacement implants.
Weimin Liu - One of the best experts on this subject based on the ideXlab platform.
-
Tribological Behavior of Plasma Nitrided 1Cr18Ni9Ti Austenitic Stainless Steel Under the Effect of Lubricant Additives
Journal of Tribology, 2009Co-Authors: Jian Fang, Yanqiu Xia, Yimin Lin, Weimin LiuAbstract:To expand the engineering application of stainless steel as Tribological Material, it is important to study the Tribological interaction of the nitrided layer with lubricating additives. The friction and wear properties of plasma nitrided 1Cr18Ni9Ti stainless steel were investigated under lubricated conditions on an Optimol Schwinyung Reibung Versch oscillating friction and wear tester. The lubrication oil was 1,1,1-trihydroxymethylpropyl trioctoate containing zinc dibutyl dithiophosphate, bismuth dibutyl dithiophosphate, and bismuth N, N-dibutyldithiocarbamate as the antiwear and extreme pressure additives. The variations in the nitrided stainless steel and the unnitrided one under the Tribological action of the additives were contrasted and the Tribological chemical interaction between the nitrided layer and the additives was revealed. The results showed that the selected additives had good synergetic effect with the nitrided layer on Tribological performance and the bismuth containing additive had better friction-reducing and antiwear abilities than the zinc containing additive. Meanwhile, under the effect of these additives, the N/(Fe+Cr) ratio rose and the Fe/Cr ratio decreased in the nitrided layer, while the Fe/Cr ratio in the unnitrided stainless steel varied little. Three main elements, N, Cr, and Fe, in nitrided layer had different actions with the additives and contributed to Tribological performance by different methods.
Yongmin Liang - One of the best experts on this subject based on the ideXlab platform.
-
Friction and wear behaviors of carbon and aramid fibers reinforced polyimide composites in simulated space environment
Tribology International, 2015Co-Authors: Mei Lv, Qihua Wang, Tingmei Wang, Fei Zheng, Yongmin LiangAbstract:The friction and wear behaviors of carbon and aramid fibers reinforced polyimide composites have been investigated in simulated space irradiation environment and start–stop friction process. The experiment results showed that the introduction of fibers decreased the friction coefficient and improved the wear-resistance of polyimide matrix after atomic oxygen and ultraviolet irradiations especially for the carbon fibers. A start–stop friction process aggravated the wear of various composite Materials against the counterpart ball. Carbon fibers reinforced polyimide displayed excellent Tribological property in irradiation environment and start–stop friction condition, which was expected to become a kind of potential Tribological Material for the application of spacecraft.
Sven Ostermeier - One of the best experts on this subject based on the ideXlab platform.
-
A rolling-gliding wear simulator for the investigation of Tribological Material pairings for application in total knee arthroplasty
BioMedical Engineering OnLine, 2010Co-Authors: Berna I Richter, Sven Ostermeier, Anke Turger, Berend Denkena, Christof HurschlerAbstract:Background Material wear testing is an important technique in the development and evaluation of Materials for use in implant for total knee arthroplasty. Since a knee joint induces a complex rolling-gliding movement, standardised Material wear testing devices such as Pin-on-Disc or Ring-on-Disc testers are suitable to only a limited extent because they generate pure gliding motion only. Methods A rolling-gliding wear simulator was thus designed, constructed and implemented, which simulates and reproduces the rolling-gliding movement and loading of the knee joint on specimens of simplified geometry. The technical concept was to run a base-plate, representing the tibia plateau, against a pivoted cylindrical counter-body, representing one femur condyle under an axial load. A rolling movement occurs as a result of the friction and pure gliding is induced by limiting the rotation of the cylindrical counter-body. The set up also enables simplified specimens handling and removal for gravimetrical wear measurements. Long-term wear tests and gravimetrical wear measurements were carried out on the well known Material pairings: cobalt chrome-polyethylene, ceramic-polyethylene and ceramic-ceramic, over three million motion cycles to allow Material comparisons to be made. Results The observed differences in wear rates between cobalt-chrome on polyethylene and ceramic on polyethylene pairings were similar to the differences of published data for existing Material-pairings. Test results on ceramic-ceramic pairings of different frontal-plane geometry and surface roughness displayed low wear rates and no fracture failures. Conclusions The presented set up is able to simulate the rolling-gliding movement of the knee joint, is easy to use, and requires a minimum of user intervention or monitoring. It is suitable for long-term testing, and therefore a useful tool for the investigation of new and promising Materials which are of interest for application in knee joint replacement implants.
-
a rolling gliding wear simulator for the investigation of Tribological Material pairings for application in total knee arthroplasty
Biomedical Engineering Online, 2010Co-Authors: Berna Richter, Sven Ostermeier, Anke Turger, Berend Denkena, Christof HurschlerAbstract:Material wear testing is an important technique in the development and evaluation of Materials for use in implant for total knee arthroplasty. Since a knee joint induces a complex rolling-gliding movement, standardised Material wear testing devices such as Pin-on-Disc or Ring-on-Disc testers are suitable to only a limited extent because they generate pure gliding motion only. A rolling-gliding wear simulator was thus designed, constructed and implemented, which simulates and reproduces the rolling-gliding movement and loading of the knee joint on specimens of simplified geometry. The technical concept was to run a base-plate, representing the tibia plateau, against a pivoted cylindrical counter-body, representing one femur condyle under an axial load. A rolling movement occurs as a result of the friction and pure gliding is induced by limiting the rotation of the cylindrical counter-body. The set up also enables simplified specimens handling and removal for gravimetrical wear measurements. Long-term wear tests and gravimetrical wear measurements were carried out on the well known Material pairings: cobalt chrome-polyethylene, ceramic-polyethylene and ceramic-ceramic, over three million motion cycles to allow Material comparisons to be made. The observed differences in wear rates between cobalt-chrome on polyethylene and ceramic on polyethylene pairings were similar to the differences of published data for existing Material-pairings. Test results on ceramic-ceramic pairings of different frontal-plane geometry and surface roughness displayed low wear rates and no fracture failures. The presented set up is able to simulate the rolling-gliding movement of the knee joint, is easy to use, and requires a minimum of user intervention or monitoring. It is suitable for long-term testing, and therefore a useful tool for the investigation of new and promising Materials which are of interest for application in knee joint replacement implants.
Anke Turger - One of the best experts on this subject based on the ideXlab platform.
-
A rolling-gliding wear simulator for the investigation of Tribological Material pairings for application in total knee arthroplasty
BioMedical Engineering OnLine, 2010Co-Authors: Berna I Richter, Sven Ostermeier, Anke Turger, Berend Denkena, Christof HurschlerAbstract:Background Material wear testing is an important technique in the development and evaluation of Materials for use in implant for total knee arthroplasty. Since a knee joint induces a complex rolling-gliding movement, standardised Material wear testing devices such as Pin-on-Disc or Ring-on-Disc testers are suitable to only a limited extent because they generate pure gliding motion only. Methods A rolling-gliding wear simulator was thus designed, constructed and implemented, which simulates and reproduces the rolling-gliding movement and loading of the knee joint on specimens of simplified geometry. The technical concept was to run a base-plate, representing the tibia plateau, against a pivoted cylindrical counter-body, representing one femur condyle under an axial load. A rolling movement occurs as a result of the friction and pure gliding is induced by limiting the rotation of the cylindrical counter-body. The set up also enables simplified specimens handling and removal for gravimetrical wear measurements. Long-term wear tests and gravimetrical wear measurements were carried out on the well known Material pairings: cobalt chrome-polyethylene, ceramic-polyethylene and ceramic-ceramic, over three million motion cycles to allow Material comparisons to be made. Results The observed differences in wear rates between cobalt-chrome on polyethylene and ceramic on polyethylene pairings were similar to the differences of published data for existing Material-pairings. Test results on ceramic-ceramic pairings of different frontal-plane geometry and surface roughness displayed low wear rates and no fracture failures. Conclusions The presented set up is able to simulate the rolling-gliding movement of the knee joint, is easy to use, and requires a minimum of user intervention or monitoring. It is suitable for long-term testing, and therefore a useful tool for the investigation of new and promising Materials which are of interest for application in knee joint replacement implants.
-
a rolling gliding wear simulator for the investigation of Tribological Material pairings for application in total knee arthroplasty
Biomedical Engineering Online, 2010Co-Authors: Berna Richter, Sven Ostermeier, Anke Turger, Berend Denkena, Christof HurschlerAbstract:Material wear testing is an important technique in the development and evaluation of Materials for use in implant for total knee arthroplasty. Since a knee joint induces a complex rolling-gliding movement, standardised Material wear testing devices such as Pin-on-Disc or Ring-on-Disc testers are suitable to only a limited extent because they generate pure gliding motion only. A rolling-gliding wear simulator was thus designed, constructed and implemented, which simulates and reproduces the rolling-gliding movement and loading of the knee joint on specimens of simplified geometry. The technical concept was to run a base-plate, representing the tibia plateau, against a pivoted cylindrical counter-body, representing one femur condyle under an axial load. A rolling movement occurs as a result of the friction and pure gliding is induced by limiting the rotation of the cylindrical counter-body. The set up also enables simplified specimens handling and removal for gravimetrical wear measurements. Long-term wear tests and gravimetrical wear measurements were carried out on the well known Material pairings: cobalt chrome-polyethylene, ceramic-polyethylene and ceramic-ceramic, over three million motion cycles to allow Material comparisons to be made. The observed differences in wear rates between cobalt-chrome on polyethylene and ceramic on polyethylene pairings were similar to the differences of published data for existing Material-pairings. Test results on ceramic-ceramic pairings of different frontal-plane geometry and surface roughness displayed low wear rates and no fracture failures. The presented set up is able to simulate the rolling-gliding movement of the knee joint, is easy to use, and requires a minimum of user intervention or monitoring. It is suitable for long-term testing, and therefore a useful tool for the investigation of new and promising Materials which are of interest for application in knee joint replacement implants.
