Experimental Study on the Mechanical Performance of Grouted Specimen with Composite Ultrafine Cement Grouts

2019 ◽  
Vol 24 (1) ◽  
pp. 38-48 ◽  
Author(s):  
Maolin Tian ◽  
Lijun Han ◽  
Qingbin Meng
Keyword(s):  
Experimental Study ◽  
Mechanical Performance ◽  
Cement Grouts ◽  
Ultrafine Cement

Study of Fault Self-Recovery and Seal Improvement for Centrifugal Compressor

2010 ◽  
Author(s):  
Weimin Wang ◽  
Jinji Gao ◽  
Yan Li ◽  
Shuangxi Li
Keyword(s):  
Experimental Study ◽  
Centrifugal Compressor ◽  
Thrust Bearing ◽  
Mechanical Performance ◽  
High Reliability ◽  
Relevant Information ◽  
Axial Displacement ◽  
Oil Film ◽  
Dry Gas Seal ◽  
Low Leakage

For centrifugal compressor, discharge or suction pressure variations due to process fluctuations or balance drum seal degradation can result in rotor thrust increasing which may jeopardize thrust bearing and compressor’s reliability. Also, the leakage flow through balance drum seal can seriously affect the efficiency of compressor. Summarizing the characteristic of axial displacement fault about centrifugal compressor and analyzing the mechanical performance of tilt pads thrust bearing, theory of axial displacement fault self-recovery is presented and realized through experimental study. The method presented in this paper monitors the stiffness of oil film and identifies the reason of axial displacement increasing. Also the low leakage feature of Dry-Gas-Seal (DGS), high reliability of labyrinth, and the feasibility of upgrading existing structure are taken into account at the same time to design a combined labyrinth-dry gas seal system on the balancing drum. Based on the combined seal system, a Fault Self-Recovering (FSR) mechanism for the fault of rotor axial displacement is introduced to assure the minimum oil film thickness was ensured in real time. The modern Computational Fluid Dynamics (CFD) and experimental study were used to validate this concept. The result and relevant information indicate that the method can realize axial displacement fault self-recovering effectively and the combined sealing system could improve the efficiency of the centrifugal compressor about four percent.

scholarly journals Effects of Different Interface Forms on Mechanical Properties of Steel Self-Compacting Concrete Composite Beams

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Chengzhi Wang ◽  
Xin Liu ◽  
Wei Liu ◽  
Zhiming Li
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Bearing Capacity ◽  
Composite Structure ◽  
Mechanical Performance ◽  
Complex Structure ◽  
Self Compacting Concrete ◽  
Element Analysis ◽  
Shear Connectors ◽  
Fea Model

In the water resources allocation project in Pearl River Delta, in order to optimize the structural design, the deep buried tunnel adopts the composite lining structure. However, the weakest link in a complex structure is the connection between two different interfaces. This paper reports the findings of an experimental study that was undertaken to investigate the interface mechanical performance of steel self-compacting concrete composite structure subjected to cyclic loads. In this study, different shear connectors are considered, and six different specimens were designed and tested, respectively. The test is used to research the effect of the different shear connectors on the bearing capacity and interface mechanical properties of composite structure in an experimental study. According to these test results, a detailed analysis was carried out on the relationships, such as the stress-strain and load-displacement relationships for the specimen. These tests show that the shear connectors will significantly enhance the bearing capacity and interface mechanical properties of the composite structure. Among them, the comprehensive performance of the specimens using the stud-longitudinal ribs shear connectors is the best. Additionally, a finite element analysis (FEA) model was developed. The comparison of the simulation results with the experimental results shows that this FEA is applicable for this type of experiment.

Experimental study on mechanical performance of polydimethylsiloxane (PDMS) at various temperatures

2020 ◽  
Vol 90 ◽  
pp. 106670
Author(s):  
Guiguan Zhang ◽  
Yuli Sun ◽  
Bingkun Qian ◽  
Hang Gao ◽  
Dunwen Zuo
Keyword(s):  
Experimental Study ◽  
Mechanical Performance

Experimental Study on the Anti-Cracking Performance for Geosynthetics Overlay

2013 ◽  
Vol 838-841 ◽  
pp. 1295-1298
Author(s):  
Ya Zhen Sun ◽  
Li Bao Wang ◽  
Bao Yang Yu
Keyword(s):  
Experimental Study ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Fatigue Test ◽  
Mechanical Performance ◽  
Asphalt Mixture ◽  
Bituminous Mixture ◽  
Bituminous Mixtures ◽  
Cracking Performance

In order to study anti-cracking performance for geosynthetics, the splitting and fatigue test of bituminous mixtures with geosynthetics and without geosythetics are carried out. The mechanical performance for tensile strength and elastic modulus of asphalt mixture are obtained through two tests. The tensile strength and elastic modulus of bituminous mixture are increased by 14.9% and 54.9% respectively. Through adding the geosynthetics overlay to achieve the purpose of retarding the development of cracks in the pavement.

Sign in / Sign up

Export Citation Format

Share Document