1Division of Plastic Surgery, Ottawa Hospital-Civic Campus, 2University of Ottawa, Faculty of Medicine Correspondence and reprints: Dr Michael Bell, The Ottawa Hospital, 402 – 1919 Riverside Drive, Ottawa, Ontario K1H 1A2. Telephone 613-739-5424, fax 613-739-7168, e-mail [email protected] Skin contact of breast prostheses is considered by many to be a significant cause of ongoing subclinical i...

Abstract The ever increasing performance requirements of modern aeroengines necessitate the development effective ways to improve efficiency and reduce losses. Casing temperature control is particularly critical from this point view, since thermal expansion directly affects blade tip clearance thus associated leakages. To limit turbine flows, active (ACC) systems have been implemented over last...

the rapid growth in natural gas consumption has increased the need for gas storage, in particular in the form of injection into depleted reservoirs. also, co2 sequestration into the depleted reservoirs has attracted a large attention recently. however, it is important to ensure that the injection pressure is maintained below a certain limit to avoid unsealing the cap rock or reactivation of any...

The present investigations on sealability evaluation for tubing and casing premium connections depend the FEM with testing. This paper proposed a theoretical model to evaluate of sphere-type connection based make-up torque, which combines Hertz contact pressure von Mises yield criterion calculating elastic–plastic distribution sealing interface adopts gas obtained from Murtagian’s experimental ...

Aiming at the problem that casing deformation can easily occur in tight oil horizontal well fracturing, based on rock mechanics experiments and probability statistics, distribution characteristics law of near-wellbore stress field reservoir STH M56 were solved analyzed by using finite element modeling numerical method. The research shows (1) max/min ratio is 1.2, difference less than 8 MPa, thi...

The casing of large electrical generators can be deformed slightly by the rotor's magnetic field. The sound emission produced by these periodic deformations, which could possibly exceed guaranteed noise emission limits, is analyzed analytically and numerically. From the deformation of the casing, the normal velocity of the generator's surface is computed. Taking into account the corresponding s...

The sulfide stress cracking (SSC) behavior of three micro-alloying 110 ksi grade Cr-Mo casing steels were evaluated according to the A-Method tensile test specified in NACE TM0177 standard (NACE A-method). fractures SSC specimens and micro-structures characterized by scanning electron microscopy (SEM) with backscattering diffraction (EBSD) transmission (TEM) BF STEM mode. results show that on p...

This work aims to study the dynamic characteristics of an entire aero-engine casing by experiments using a new type rotating exciter. New vibration sensor layout rules are proposed according experimental results and transmission characteristics. The response is carried out, different measuring points also studied. finite element model engine casing’s structure established obtain natural frequen...