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Influence of lateral initial pressure on axisymmetric wave propagation in hollow cylinder based on first power hypo-elastic model

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Journal of Central South University 2014年第2期21卷 753-760页

作者：胡文韬夏唐代陈炜昀 Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education (Zhejiang University) Research Center of Coastal and Urban Geotechnical Engineering Zhejiang University

Influence of identical applied initial pressures on the radial surfaces of a hollow cylinder which is compose of materials with first power hypo-elastic constitutive model was *** basic equations of the problem were built up based on the framework of piecewise homogeneous body model with the use of three-dimensional linearized theory of elastic waves in initially stressed bodies(TLTEWISB).With the method proposed previously,this problem was then solved ***,the dispersion group velocity of the lowest order mode with different initial pressures was also *** can be concluded that the initial pressure and the geometry parameters will induce considerable changes of different degrees in dispersive relation between phase velocity and wave number in opposite trend(positive in initial pressure and negative in thickness).

关键词： initial pressure TLTEWISB first power hypo-elastic model dispersive relation

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Failure Mechanism of O-Ring Seals under Extreme Operating Conditions

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Modern Mechanical Engineering 2018年第1期8卷 11-30页

作者： Gyorgy Szabó Károly Váradi Department of Machine and Product Design Budapest University of Technology and EconomicsBudapestHungary

In this paper the behavior of an O-ring made of NBR rubber was investigated under extreme conditions. The effect of the extreme initial compression, operating pressure and extreme temperature conditions were examined. The rubber material was tested in simple tension, pure shear and equibiaxial tension modes complemented with a Dynamic Mechanical Thermal Analysis (DMTA) to capture the viscoelastic behavior of the material. For the investigation, a large-strain viscoelastic material model was developed by the authors, to take into account the large deformations caused by extreme conditions. Insufficient space during installation causes extreme initial compression consequently leading the material to crack on the contacting outer surfaces. It was found that the excessive strain and friction induced shear stress contributes primarily to this phenomenon. Extreme operating pressure causes the seal to penetrate into the gap between the shaft and the housing. This behavior damages the material and cracks appear on the seal. High strain areas were found in the proximity of the gap in the material. The analysis of the extreme operating temperature showed that during cooling the O-ring can completely loose its ability to seal at -70°C. There are three contributing factors: the speed of cooling, the temperature and the coefficient of thermal expansion.

关键词： O-Rings Finite Element Analysis initial pressure Overpressure Temperature Extremes

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