Selecting the Method for Pre-tightening Threaded Connections of Heavy Engineering Objects

2021 ◽  
pp. 69-77
Author(s):  
Anatoliy Gaydamaka ◽  
Yuriy Muzikin ◽  
Volodymyr Klitnoi ◽  
Yevheniia Basova ◽  
Sergey Dobrotvorskiy
Keyword(s):  
Threaded Connections

Study of the Fixing Process of Threaded Connections By Anaerobic Materials

2018 ◽  
pp. 122-127
Author(s):  
P. P. Fedirko ◽  
V. O. Krol ◽  
V. S. Bonchyk
Keyword(s):  
Room Temperature ◽  
Glycol Ethers ◽  
Threaded Connections ◽  
Torque Wrench ◽  
Mechanical Methods ◽  
Study Results ◽  
Polyalkylene Glycol ◽  
High Conversion Rate ◽  
Anaerobic Adhesives ◽  
Protection Of The Metal

The article presents the study results of the anaerobic materials effect on the strength of threaded connections in the repair of machinery and equipment. Their use is the simplest, most economical and reliable method of fixing and restoring threaded connections. The basis of the anaerobic compositions is polymerization compounds of the acrylic series, most often dimethacrylic and polyalkylene glycol ethers, which are characterized by a high conversion rate into spatially cross-linked polymers. Unlike mechanical methods of fixation and recovery, anaerobic materials completely fill the space between the threads of the spiral. This significantly increases the friction between the parts of the connection, improves the protection of the metal of the interface against corrosion, increases the torque when unscrewing in relation to the tightening torque, increases the resistance of the connection to the action of vibration, shock, shock loads. For the research, anaerobic thread locks were purchased, which were tested according to the same procedure and, after 24 hours at room temperature, each connection was clamped in a vice in turn so that the head of the torque wrench captures only the top nut, which had to be unscrewed. The rate of hardening of anaerobic adhesives is influenced by the size of the gaps between the combined surfaces, temperature, cleaning quality, the nature of the coating, etc. It has been established that the presence of polymerized anaerobic materials in the contact zone of parts significantly increases the strength of the joints. The conducted studies allowed to verify in practice the conformity of the tested anaerobic clamps of threaded connections to the stated parameters, to delineate the scope of their application. So, anaerobic adhesives for fixing threaded connections allow you to fix screws, nuts, bolts and pins to protect against loosening and loosening due to vibration

scholarly journals Research of reliability and efficiency of technological processes of mechanical assembly production on the basis of the common semi-Markov model

2018 ◽  
Vol 224 ◽  
pp. 01138
Author(s):  
Yuri Rapatskiy ◽  
Mikhail Zamorenov ◽  
Vadim Kopp ◽  
Yuri Obzherin ◽  
Vladimir Gusev ◽  
...  
Keyword(s):  
Distribution Functions ◽  
Mechanical Assembly ◽  
Renewal Equations ◽  
Technological Processes ◽  
Threaded Connections ◽  
Proposed Model ◽  
The Common ◽  
Semi Markov Processes ◽  
Simulation Parameters ◽  
Assembly Production

In the article a common semi-Markov mathematical model is considered that allows one to investigate the productivity and reliability of various technological processes of mechanical assembly production. The proposed model allows to study, inter alia, technological processes of manufacturing parts with screw and assemblies of threaded connections. Mathematical apparatus of the research is the theory of semi-Markov processes with a common phase space, which operates with a common kind of random variables distribution functions. If the considering process in the system is a subsystem located on a higher level of hierarchy, the hierarchical model for compatibility with each other levels as output simulation parameters required distribution functions. In the proposed model, based on the decision of the Markov renewal equations depend not only on the torque characteristics, but also the distribution function of time per unit of output service according to different kinds of undervalued failures.

The Effect of Axial Tension and Borehole Curvature on Torsion Limit of Drill String Threaded Connections

2021 ◽  
pp. 105555
Author(s):  
Feng Chen ◽  
Yonghao Huo ◽  
Haiyi Zhao ◽  
Qinfeng Di ◽  
Wenchang Wang ◽  
...  
Keyword(s):  
Drill String ◽  
Axial Tension ◽  
Threaded Connections

A Hybrid Supervised Deep Learning and Nonlinear Finite Element Framework for Efficient Fatigue Life Predictions of Rotary Shouldered Threaded Connections

2020 ◽  
Author(s):  
Fei Song ◽  
Ke Li
Keyword(s):  
Finite Element ◽  
Deep Learning ◽  
Fatigue Life ◽  
Learning Algorithm ◽  
Fatigue Tests ◽  
Full Scale ◽  
Remaining Useful Life ◽  
Nonlinear Finite Element ◽  
Threaded Connections ◽  
Life Predictions

Abstract In this paper, a hybrid computational framework that combines the state-of-the art machine learning algorithm (i.e., deep neural network) and nonlinear finite element analysis for efficient and accurate fatigue life prediction of rotary shouldered threaded connections is presented. Specifically, a large set of simulation data from nonlinear FEA, along with a small set of experimental data from full-scale fatigue tests, constitutes the dataset required for training and testing of a fast-loop predictive model that could cover most commonly used rotary shouldered connections. Feature engineering was first performed to explore the compressed feature space to be used to represent the data. An ensemble deep learning algorithm was then developed to learn the underlying pattern, and hyperparameter tuning techniques were employed to select the learning model that provides the best mapping, between the features and the fatigue strength of the connections. The resulting fatigue life predictions were found to agree favorably well with the experimental results from full-scale bending fatigue tests and field operational data. This newly developed hybrid modeling framework paves a new way to realtime predicting the remaining useful life of rotary shouldered threaded connections for prognostic health management of the drilling equipment.

Fatigue of Drill String Connections

1995 ◽  
Vol 117 (2) ◽  
pp. 126-132 ◽  
Author(s):  
F. P. Brennan
Keyword(s):  
Aspect Ratio ◽  
Crack Growth ◽  
Empirical Model ◽  
Drill String ◽  
Full Scale ◽  
Growth Data ◽  
Service Environment ◽  
Threaded Connections ◽  
Bend Tests ◽  
Full Scale Tests

This paper reports full-scale tests on threaded connections used in drill strings. A concise background is given concerning the in-service environment and loading conditions on the connections. This details some of the reasons particular steels are used in preference to others. Crack growth data is given for ten full-scale axial and rotating bend tests. This is compared with predictions from a dedicated weight function fracture mechanics solution designed for threaded connections. Crack aspect ratio is considered with a view to development of an appropriate empirical model.

Tests of Threaded Connections Made by Additive Manufacturing Technologies

2019 ◽  
pp. 329-337 ◽  
Author(s):  
Wojciech Kajzer ◽  
Katarzyna Gieracka ◽  
Mateusz Pawlik ◽  
Marcin Basiaga ◽  
Anita Kajzer ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Threaded Connections ◽  
Manufacturing Technologies

Evaluation of the Effect of Different Mean Stress Levels on the Fatigue Resistance of OCTG Premium Threaded Connections

2017 ◽  
Author(s):  
Yoshinori Ando ◽  
Yosuke Oku ◽  
Masaaki Sugino ◽  
Carol Johnston
Keyword(s):  
Fatigue Life ◽  
Primary Root ◽  
Initiation Site ◽  
Mean Stress ◽  
Standard Material ◽  
Root Cause ◽  
Threaded Connection ◽  
Threaded Connections ◽  
Stress Levels ◽  
Scale Test

Identification of the effect of mean stress for fatigue performance of the premium threaded connection for the OCTG pipes, was conducted via full-scale test. API standard material [grade L80-1] was used for the test. The nominal pipe outside diameter and wall thickness were 244.48 mm (9-5/8 inch) and 11.99 mm (0.472 inch), respectively. The fatigue life of the specimens tested with no mean stress was longer than that of the specimens tested with a tensile mean stress. Through-wall cracks were found at the imperfect thread area of the male embodiment, but the crack initiation site depended on the mean stress. However, the primary root cause of the failure on both mean stress levels can be regarded as the fretting fatigue. Fatigue life was also able to be estimated using modified Goodman relation.

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