Self‐healable polyacrylic acid‐polyacrylamide‐ferric ion dual‐crosslinked hydrogel with good biotribological performance as a load‐bearing surface

2019 ◽  
Vol 137 (13) ◽  
pp. 48499 ◽  
Author(s):  
Yuntong Liu ◽  
Dangsheng Xiong
Keyword(s):  
Polyacrylic Acid ◽  
Ferric Ion ◽  
Bearing Surface ◽  
Load Bearing

Properties of B4C-Based Composite with Layered Structure

2014 ◽  
Vol 602-603 ◽  
pp. 532-535
Author(s):  
Zhen Nan Li ◽  
Si Yang Fan ◽  
Xin Yan Yue ◽  
Zhao Bin Sun ◽  
Jian Jun Wang ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Flexural Strength ◽  
Vickers Hardness ◽  
Layered Structure ◽  
Hot Pressing ◽  
Interfacial Bonding ◽  
Bearing Surface ◽  
Load Bearing ◽  
Porous Preform ◽  
Layer Composite

A three-layer material based on B4C/Al, B4C/TiB2 and B4C composites had been successfully prepared. The microstructures and properties of B4C/Al-B4C/TiB2-B4C composite were investigated in detail. The three-layer porous preform was first prepared by hot pressing. Then the three-layer composite was fabricated by infiltrating aluminum into the porous preform in vacuum. The three-layer B4C/Al-B4C/TiB2-B4C composite showed good interfacial bonding. When using the B4C ceramics layer as the load-bearing surface, the flexural strength, fracture toughness and Vickers hardness of the composite were 230 MPa, 3.4 MPa·m1/2 and 38 GPa, respectively.

The Formulation of the Mixed Lubrication Problem as a Generalized Nonlinear Complementarity Problem

1986 ◽  
Vol 108 (4) ◽  
pp. 598-603 ◽  
Author(s):  
Kong Ping Oh
Keyword(s):  
Complementarity Problem ◽  
Nonlinear Complementarity Problem ◽  
Mixed Lubrication ◽  
Bearing Surface ◽  
Load Bearing ◽  
Lubricant Flow ◽  
Complementarity Condition ◽  
Special Cases ◽  
Method Of Solution ◽  
Lubrication Mode

The mixed-lubrication problem is formulated as a nonlinear generalized complementarity problem in which the pressure acting on the load-bearing surface is taken as the unknown, and the lubricant flow and the gap between the surfaces are taken as its complements. An iterative method was developed to find the solution, which satisfies the complementarity condition that at each point on the load-bearing surface, the pressure or at least one of its complements, is zero at all times. Moreover, the pressure and its complements satisfy non-negativity constraints. The solution intrinsically decomposes the load-bearing surface into three distinct subregions: solid-to-solid contact, hydrodynamically lubricated contact, and no contact (or cavitation). It is shown that the mixed-lubrication formulation degenerates into the special cases of hydrodynamic or solid-to-solid contacts under appropriate load and speed conditions. A journal bearing with elastic support is analyzed to illustrate the method of solution. The transition of the lubrication mode from pure hydrodynamic contact to mixed contact is demonstrated.

Load-Bearing in the Ovine Medial Tibial Condyle: Effect of Meniscectomy

1993 ◽  
Vol 06 (02) ◽  
pp. 100-104 ◽  
Author(s):  
D. M. Pickles ◽  
C. R. Bellenger
Keyword(s):  
Knee Joint ◽  
Contact Area ◽  
Mammalian Species ◽  
Total Removal ◽  
Load Bearing ◽  
Human Knee ◽  
Biochemical Effects ◽  
Pressure Sensitive ◽  
Medial Meniscectomy ◽  
Tibial Condyle

SummaryTotal removal of a knee joint meniscus is followed by osteoarthritis in many mammalian species. Altered load-bearing has been observed in the human knee following meniscectomy but less is known about biochemical effects of meniscectomy in other species. Using pressure sensitive paper in sheep knee (stifle) joints it was found that, for comparable loads, the load-bearing area on the medial tibial condyle was significantly reduced following medial meniscectomy. Also, for loads of between 50 N and 500 N applied to the whole joint, the slope of the regression of contact area against load was much smaller. Following medial meniscectomy, the ability to increase contact area as load increased was markedly reduced.The load bearing area on the medial tibial condyle was reduced following meniscectomy.

Effect of long-term loading on timber load-bearing elements

2015 ◽  
Vol 10 (2) ◽  
pp. 25-34
Author(s):  
Kristian Sogel
Keyword(s):  
Load Bearing
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