The Study of High Strength Bolt Preload with Hydraulic Tensioner Installation

2011 ◽  
Vol 314-316 ◽  
pp. 988-994 ◽  
Author(s):  
Tie Neng Guo ◽  
Gen Li ◽  
Li Gang Cai ◽  
Zhi Liang Wang
Keyword(s):  
Theoretical Analysis ◽  
Efficient Method ◽  
Theoretical Basis ◽  
High Strength ◽  
Analysis Method ◽  
Heavy Duty ◽  
Initial Tension ◽  
Extension Method ◽  
High Strength Bolt ◽  
Bolt Preload

Preloading the high strength bolt using hydraulic extension method is a fast and efficient method for bolt installation. Hydraulic bolt tension device can guarantee the initial tension of bolt well. However, if the relation of initial tension and the final remaining preload of bolt cannot be determined, the preload on the bolts still cannot be guaranteed. This paper uses theoretical analysis method to research the relation between the eventual preload and the initial tension of high strength bolts on Heavy-duty Gantry beams. Then we proposes a set of calculation method of bolt installation preload and the initial tension and provides theoretical basis for the installation of heavy-duty segmented beam.

The Stress Analysis of Joint Connecting Bolt of Submersible Electric Pump

2013 ◽  
Vol 385-386 ◽  
pp. 246-249
Author(s):  
Yu Qi Ding ◽  
Ju Bao Liu ◽  
Liang Quan Tao ◽  
Yun Cong Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Theoretical Basis ◽  
Electric Pump ◽  
Analysis Method ◽  
Element Analysis ◽  
Finite Element Analysis Method ◽  
Temperature Method ◽  
Bolt Preload ◽  
Submersible Electric Pump

Submersible electric pump units are connected by bolts. This paper uses finite element analysis method to simulate how the pump joint bolt behave when it transmit torque.In this paper, temperature method is adopted to simulate the bolt preload and axial deformation.It also used to analyse and calculate the limited value when submersible electric pump units transmit torque under different preload. All of this provide the designing of connecting bolt preload and construction with theoretical basis.

Ultrasonic testing of axial stress of high strength bolts for bridges

2020 ◽  
Vol 64 (1-4) ◽  
pp. 685-692
Author(s):  
Sheng Feng ◽  
Jun Tu ◽  
Shilin Wei ◽  
Yongbin Chi ◽  
Xu Zhang ◽  
...  
Keyword(s):  
Service Life ◽  
Theoretical Analysis ◽  
Ultrasonic Testing ◽  
Axial Stress ◽  
High Strength ◽  
Flight Time ◽  
Measuring Error ◽  
Analysis Method ◽  
Longitudinal And Shear Waves ◽  
Acoustic Elasticity

The axial stress of high strength bolts for bridges affects the service life directly, it is necessary to measure it regularly. Based on the theory of acoustic elasticity and combination of longitudinal and shear waves, a new theoretical analysis method is proposed. The stressed and non-stressed areas of bolt are separated, and the derived formula only use the flight time and difference of acoustoelastic coefficients to get axial stress. Further, the preload experiments with high strength bolts of grade 8.8S and 10.9S is designed, the experimental results show that the proposed method is applicable to the axial stress of the bridge bolts with any specifications, material and different screwing depth used in this paper, the effect of elastic deformation on the flight time is eliminated, and the measuring error is within 5%.

Constant-amplitude fatigue behavior of M24 high-strength bolt of end-plate flange connection

Structures ◽  
2021 ◽  
Vol 34 ◽  
pp. 2041-2053
Author(s):  
Jinfeng Jiao ◽  
Zhanxiang Liu ◽  
Qi Guo ◽  
Yong Liu ◽  
Honggang Lei
Keyword(s):  
Fatigue Behavior ◽  
High Strength ◽  
Constant Amplitude ◽  
Flange Connection ◽  
End Plate ◽  
High Strength Bolt

The Theoretical Analysis of Performance Evaluation Connotation of Rural Highway Projects

2012 ◽  
Vol 204-208 ◽  
pp. 1848-1856
Author(s):  
Wu Gong Wang ◽  
Rong Guo Ma ◽  
Kun Feng ◽  
Guo Hua Liang
Keyword(s):  
Public Finance ◽  
Performance Evaluation ◽  
Theoretical Analysis ◽  
Swot Analysis ◽  
Project Performance ◽  
Analysis Method ◽  
Highway Projects ◽  
Rural Highway ◽  
Analysis Of Performance ◽  
Highway Project

On the basis of defining the concept of rural highway project performance, the necessity of the project performance evaluation of rural highway is analyzed. According to the theories of government's public function, fiduciary responsibilities accountability and public finance, the relation between rural highway and public finance are made researches on. Furthermore,with the application of the demand level theory of Maslow, the interrelationship among objects of the rural highway project performance evaluation is made an analysis of, and on top of that, combined with SWOT analysis method, the demand and goal of rural highway project performance evaluation are put forward.

Effect of Electrolytes Variation on the Formation of Oxide Layers of Al7075 Alloys by Electrolytic Plasma Processing

2013 ◽  
Vol 378 ◽  
pp. 209-212
Author(s):  
Dong Gun Lee ◽  
Byunh Hyun Ahn ◽  
Je Hyun Lee ◽  
Uk Rae Cho ◽  
Bon Heun Koo
Keyword(s):  
Treatment Process ◽  
Protective Coatings ◽  
Plasma Processing ◽  
Weight Ratio ◽  
High Hardness ◽  
High Strength ◽  
Heavy Duty ◽  
Conventional Steel ◽  
Steel Material ◽  
Electrolytic Plasma Processing

Al7075 alloy has typically good mechanical properties. Al7075 alloy has an ultimate tensile strength and yield strength, which is commonly used in the manufacturing of heavy-duty structures requiring good corrosion resistance and in applications requiring high strength to weight ratio, as well as good fatigue resistance. However, as compared to strength and corrosion of conventional steel material, it has some drawbacks. To overcome these disadvantages, Electrolytic plasma processing (EPP) was used. (EPP) is a novel electrochemical and physical surface treatment process for generating protective coatings on light metals. Because, these coating scan present high hardness and continuous barriers, it can offers good protection against abrasion, corrosion and heat as well as electrical insulation. The EPP treatments were carried out under a hybrid voltage of AC 200V (50Hz) combined with DC 260V power supply.

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