Results 1 to 10 of about 1,231 (132)

An equivalent circulating density prediction model for extended-reach horizontal wells considering drill strings sinusoidal buckling [PDF]

Scientific Reports
Sinusoidal buckling of drill strings will be easily caused during drilling process of extended-reach horizontal wells due to the factors such as excessive well length and larger friction torque, which will cause measurement errors of well depth and ...
Zhao Huang, Yanfei Li, Kun Jiang, Junrui Ge, Yue Gu, Zhiqiang Hu   +5 more
doaj   +2 more sources

Study on Sinusoidal Post-Buckling Deformation of Coiled Tubing in Horizontal Wells Based on the Separation Constant Method

Machines, 2023
In this paper, a set of partial differential equations considering the dynamic effects of the coiled tubing (CT) is established based on the bending theory of slender beams considering the axial loads.
Lei Wang, Yan Zhong
exaly   +3 more sources

Analysis of sinusoidal post-buckling deformation of horizontal coiled tubing with initial residual bending. [PDF]

PLoS ONE
In the process of horizontal well construction, the working environment in the well is very complicated. It is difficult to determine the actual deformation and force of the coiled tubing in the wellbore from the load change at the wellhead along.
Zhuang Li, Liangyu Chen, Fei Yuan, Lei Zhao   +3 more
doaj   +4 more sources

A Drive–Vibration Integrated Piezoelectric Actuator for Flexible Electrode Implantation [PDF]

Micromachines
In this paper, a drive–vibration integrated piezoelectric actuator (DVIPA) is proposed for vibration-assisted implantation of flexible electrodes.
Xinhui Li, Di Wu, Xiaohui Lin, Tianyu Jiang, Jijie Ma, Ya Li, Yili Hu, Yingting Wang, Hongbo Zhong, Xinyu Yang, Jianping Li, Jianming Wen   +11 more
doaj   +2 more sources

Mechanical fatigue in microtubules [PDF]

Scientific Reports
Mechanical failure of biological nanostructures due to sustained force application has been studied in great detail. In contrast, fatigue failure arising from repeated application of subcritical stresses has received little attention despite its ...
Syeda Rubaiya Nasrin, Neda M. Bassir Kazeruni, Juan B. Rodriguez, Stanislav Tsitkov, Akira Kakugo, Henry Hess   +5 more
doaj   +2 more sources

Buckling and Vibration Analysis of a Double-layer Graphene ‎Sheet Coupled with a Piezoelectric Nanoplate [PDF]

Journal of Applied and Computational Mechanics, 2022
In this article, the vibration and buckling of a double-layer Graphene sheet (DLGS) coupled with a piezoelectric nanoplate through an elastic medium (Pasternak and Winkler models) are investigated.
Keramat Malekzadeh Fard, Mehdi Khajehdehi Kavanroodi, Hosein Malek-Mohammadi, Ali Pourmoayed   +3 more
doaj   +1 more source

Bending and Buckling Analysis of a Nth-Order Shear Deformation Nanoplate using Modified Couple Stress Theory [PDF]

International Journal of Advanced Design and Manufacturing Technology, 2021
In this paper a Nth order nanoplate model is developed for the bending and buckling analysis of a graphene nanoplate based on a modified couple stress theory. The strain energy, external work and buckling equations are solved.
Majid Eskandari shahraki, mahmoud shariati, naser asiaban   +2 more
doaj   +1 more source

Single Variable Thick Plate Buckling Problems Using Double Finite Sine Transform Method [PDF]

Engineering and Technology Journal, 2023
This paper derives buckling solutions for single variable thick plate buckling problems using the double finite sine transform method (DFSTM). The problem governing partial differential equation (GPDE), originally formulated by Shimpi and others, uses a ...
Charles Ike
doaj   +1 more source

Theoretical analysis of shear buckling stress in torsion of thin-walled square cross-section beams

Nihon Kikai Gakkai ronbunshu, 2023
Thin high-strength steel sheets are increasingly being applied to vehicle frames in order to increase the strength and reduce the weight. The thinner the plate, the more likely it is to occur buckling.
Katsuya FURUSU, Tatsuyuki AMAGO
doaj   +1 more source

The Analytic Technique and Experimental Research Methods of Post-buckling about Slender Rod Strings in Wellbore [PDF]

Journal of Petroleum Science and Technology, 2016
The buckling behavior of rod strings in wellbore is one of the key issues in petroleum engineering. The slender rod strings in vertical wellbore were selected as research objects.
Yue Qian Bei, Liu Ju-bao, Fu Mao-qing
doaj   +1 more source