Results 31 to 40 of about 80,493 (290)

Research on preload relaxation for composite pre-tightened tooth connections

Science and Engineering of Composite Materials, 2019
Preload is the primary reason why pre-tightened tooth connections (PTTC) can transfer relatively large loads. However, creep of the composite would cause the preload relaxation, resulting in reducing bearing capacity of the connection.
Li Fei, Zhao QiLin, Chen Haosen, Luo Sheng   +3 more
doaj   +1 more source

An Adaptive Preload Device for High-Speed Motorized Spindles for Teaching and Scientific Research

Actuators
This study focuses on an experimental device for the adaptive adjustment of the preload of high-speed motorized spindles. Firstly, based on Hirano’s criterion, the optimal preload for bearings at different rotational speeds was determined, and an ...
Haipeng Yan, Zongchu Zhang, Guisen Wang, Jinda Zhu, Tingting Sun   +4 more
doaj   +1 more source

Analysis of Preload of Three-Stator Ultrasonic Motor

Micromachines, 2021
The pre-pressure device of the ultrasonic motor plays a vital role in the design of the entire motor structure, the contact state of the stator and rotor of the motor, dynamic properties of the stator, friction and wear characteristics of the rotor; even
Zheng Li, Hui Zhao, Shuai Che, Xuetong Chen, Hexu Sun   +4 more
doaj   +1 more source

Nondestructive ultrasonic measurement of bolt preload using the pulsed-phase locked-loop interferometer [PDF]

, 1985
Achieving accurate preload in threaded fasteners is an important and often critical problem which is encountered in nearly all sectors of government and industry.
Allison, S. G., Heyman, J. S.
core   +1 more source

Four‐Point Bending Tests at High Temperatures on Commercial MgO‐C Refractory Bricks with and Without Recyclate Considering Different Carbon Contents

Advanced Engineering Materials, EarlyView.
Four‐point bending tests are conducted in an argon atmosphere on commercial MgO‐C brick grades with and without MgO‐C recyclate from room temperature up to 1300 °C. No detrimental effect of the MgO‐C recyclates on bending strength is found. Instead, a decisive influence of the total carbon content is observed, with lower total carbon contents ...
Alexander Schramm, Lukas Knöchel, Thomas Schemmel, Christos G. Aneziris, Anja Weidner, Horst Biermann   +5 more
wiley   +1 more source

A Study of the Nonlinear Attenuation Behavior of Preload in the Bolt Fastening Process for Offshore Wind Turbine Blades Using Ultrasonic Technology

Energies
The attenuation of bolt preload is a critical factor leading to bolt fatigue failure, whereas the study of the nonlinear attenuation behavior of preload and its mechanism during installation is an inevitable challenge in engineering practice.
Jia Han, Ke Xie, Zhaohui Yang, Lin’an Li, Ming Zhao   +4 more
doaj   +1 more source

A methodology for the lightweight design of modern transfer machine tools [PDF]

, 2018
This paper deals with a modern design approach via finite elements in the definition of the main structural elements (rotary table and working unit) of an innovative family of transfer machine tools. Using the concepts of green design and manufacture, as
Cavalli, Omar, Croccolo, Dario, De Agostinis, Massimiliano, Fini, Stefano, Olmi, Giorgio, Robusto, Francesco, Vincenzi, Nicol\uf2   +6 more
core   +2 more sources

Micropatterned Biphasic Printed Electrodes for High‐Fidelity on‐Skin Bioelectronics

Advanced Functional Materials, EarlyView.
Micropatterned biphasic printed electrodes achieve unprecedented skin conformity and low impedance by combining liquid‐metal droplets with microstructured 3D lattices. This scalable approach enables high‐fidelity detection of ECG, EMG, and EEG signals, including alpha rhythms from the forehead, with long‐term comfort and stability.
Manuel Reis Carneiro, Telmo Lopes, André F. Silva, Carmel Majidi, Mahmoud Tavakoli   +4 more
wiley   +1 more source

Does low-energy sweetener consumption affect energy intake and body weight? A systematic review, including meta-analyses, of the evidence from human and animal studies [PDF]

, 2015
By reducing energy density, low-energy sweeteners (LES) might be expected to reduce energy intake (EI) and body weight (BW). To assess the totality of the evidence testing the null hypothesis that LES exposure (versus sugars or unsweetened alternatives ...
de Graaf, C, Higgs, S, Hogenkamp, P S, Lluch, A, Mela, D J, Ness, A R, Penfold, C, Perry, R, Putz, P, Rogers, P J, Yeomans, M R   +10 more
core   +5 more sources

Bio‐Friendly Artificial Muscles Based on Carbon Nanotube Yarns and Eutectogel Derivatives

Advanced Functional Materials, EarlyView.
Solid‐state artificial muscles based on coiled commercial carbon nanotube yarns coated with eutectogel derivatives exhibit unipolar actuation through selective ion intercalation. Combining polyanionic and polycationic gels enables enhanced contractile stroke and high energy density.
Gabriela Ananieva, Cédric Vancaeyzeele, Giao T.M. Nguyen, Daniel Aguilera‐Bulla, Mathieu Pinault, Frédéric Vidal, Cédric Plesse   +6 more
wiley   +1 more source