Evaluation of residual elasticity of an internal expansion-induced concrete

2019 ◽  
Author(s):  
F Chen
Keyword(s):  
Internal Expansion

Resistance to Synthetic Seawater Aggression of Clay Ceramics Incorporated with an Ornamental Stone Residue

2014 ◽  
Vol 798-799 ◽  
pp. 269-274 ◽  
Author(s):  
Gustavo de Castro Xavier ◽  
Jonas Alexandre ◽  
Paulo César de Almeida Maia ◽  
Fernando Saboya Albuquerque ◽  
Leonardo Gonçalves Pedroti ◽  
...  
Keyword(s):  
Firing Temperature ◽  
Standard Procedure ◽  
Degradation Process ◽  
Ceramic Materials ◽  
Linear Shrinkage ◽  
Synthetic Seawater ◽  
Internal Expansion ◽  
Ornamental Stone ◽  
Clay Ceramics ◽  
Chloride Salts

Clay ceramic materials exposed to a marine environment may be subjected to complete degradation due to the presence of chloride salts in the air. The exposition allows the chloride to penetrate in structural pores causing an internal expansion, which eventually split the ceramic apart. In open air, the solar radiation as well as the rain and wind contribute to accelerate the degradation process. In the present work the laboratory assisted degradation of clay ceramics incorporated with a granite residue from ornamental stone processing was evaluated by synthetic seawater aggression according to standard procedure. The amount of incorporated residues, up to 10 wt % and the ceramic firing temperature, up to 900°C, were variable conditions statistically analyzed by factorial planning. Degradation wetting-drying tests were conducted up to 6 months. The results showed that the linear shrinkage of the residue-free ceramics do not stabilize during the test period for any firing temperature. By contrast, the residue-incorporated ceramics tend to stabilize after 4 months. In addition, a decrease in water absorption and flexural strength was observed in same speciemens.

Total Breast Reconstruction With Fat Grafting After Internal Expansion and Expander Removal

2017 ◽  
Vol 78 (4) ◽  
pp. 392-396 ◽  
Author(s):  
Andrea Manconi ◽  
Francesca De Lorenzi ◽  
Badir Chahuan ◽  
Valeria Berrino ◽  
Pietro Berrino ◽  
...  
Keyword(s):  
Breast Reconstruction ◽  
Fat Grafting ◽  
Internal Expansion

scholarly journals Research on structural parameter optimization and thermal performance of twin-screw expander

2019 ◽  
Vol 14 (3) ◽  
pp. 386-393
Author(s):  
Chenghu Zhang ◽  
Jiahao Gao ◽  
Jie Fu ◽  
Yaping Li ◽  
Jiyou Lin
Keyword(s):  
Thermal Performance ◽  
Torsion Angle ◽  
Structural Parameters ◽  
Programming Algorithm ◽  
Structural Parameter ◽  
Internal Expansion ◽  
Twin Screw ◽  
Expansion Angle ◽  
Sequence Method ◽  
Shaft Power

Abstract This paper analyzes rotor profile and meshing law of twin-screw expander. Elementary area is calculated by meshing sequence method, and elementary volume is solved by integration. The influence of geometric characteristics such as torsion angle and internal expansion angle of male rotor on the thermal performance of twin-screw expander is studied. The results show the following: reasonably reducing internal expansion angle and positive rotor torsion angle can increase isentropic adiabatic power of twin-screw expander. Taking isentropic adiabatic efficiency as optimization goal, sequential quadratic programming algorithm is used to optimize the structural parameters of twin-screw expander, and the influence of leakage on its functional force is analyzed. Considering leakage effect, actual shaft power of twin-screw expander is 16.7 kW, the isentropic adiabatic power under ideal conditions is 21.3 kW, and the adiabatic efficiency is 78.71%.

The Modal Analysis with Finite Element Method for the Cutting Arm of EBZ160 Roadheader

2013 ◽  
Vol 397-400 ◽  
pp. 405-408 ◽  
Author(s):  
Zhi Feng Dong ◽  
Tian Hao Wang ◽  
Jie Liu ◽  
Jian Nong Huang ◽  
Li Yu Fang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Modal Analysis ◽  
Vibration Frequency ◽  
Vibration Modes ◽  
Expansion Tube ◽  
Maximum Order ◽  
Finite Element Software ◽  
Internal Expansion ◽  
External Expansion

Cutting arm was the key assembly of the roadheader. Since complex force condition, violent and irregular vibration, the parts of the cutting arm assembly acted with each other, which led to the surfaces wear and damage of the parts. The finite element software ANSYS was used to calculate the vibration modes of the six parts and the assembly of the cutting arm. The maximum amplitudes whose maximum order was five were got by modal analysis. According to the calculation result, it was found that the vibration frequency of internal expansion tube and external expansion tube was close in each order and analyzed the reason for their serious wear.

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