Results 61 to 70 of about 1,622,252 (341)

Characteristics of direct shear test for plain concrete joint with rubber cushion

矿业科学学报, 2018
The contact friction between the segments and the joints of shield segments plays a crucial role in the stability of the shield segment.In order to analyze the contact friction among tunnel segments,direct shear tests were carried out on concrete ...
Zhang Zhenyu, Li Haojie, Jia Changheng, Feng Jili   +3 more
doaj   +1 more source

Tribological Performance of 60NiTi Alloy Under Varying Contact Conditions and Elevated Temperatures in Linear Reciprocating Sliding

Advanced Engineering Materials, EarlyView.
This study investigates the tribological response of 60NiTi alloy under dry, water‐lubricated and high‐temperature conditions. The alloy exhibits decreasing wear volume and friction with increasing temperature due to the formation of protective oxide layers. The work clarifies dominant wear mechanisms and demonstrates the suitability of 60NiTi for high‐
Anthony Onyebuchi Okoani, Miguel Angel Selles, Maziar Ramezani   +2 more
wiley   +1 more source

Shear-Compression Failure Condition of Key Strata Under Elastic Support During Periodic Breakage

Applied Sciences
The shear-compression failure of key strata leads to stair-step collapse and severe mine pressure, posing significant safety risks in coal mines. Existing theories fail to account for the boundary conditions and breaking sizes of key strata, making ...
Hongjie Liu, Mingxian Peng, Yang Tai, Jun Ding   +3 more
doaj   +1 more source

Experimental analysis and modeling of orthogonal cutting using material and friction models [PDF]

, 2007
In this study, a process model for orthogonal cutting processes is proposed. The model involves the primary and secondary deformation zones. The primary shear zone is modeled by a Johnson-Cook constitutive relationship and a shear plane having constant ...
Budak, Erhan, Ozlu, Emre, Özlü, Emre
core  

Network-Configurations of Dynamic Friction Patterns

, 2012
The complex configurations of dynamic friction patterns-regarding real time contact areas- are transformed into appropriate networks. With this transformation of a system to network space, many properties can be inferred about the structure and dynamics ...
Ghaffari, H. O., Young, R. P.
core   +1 more source

Effect of Oxygen Content on Surface and Subsurface Integrity During Turning of Ti–6Al–4V

Advanced Engineering Materials, EarlyView.
This study examines how oxygen content in the ambient atmosphere affects the surface and subsurface properties of Ti–6Al–4V during turning. Results show that oxygen does not influence surface roughness. However, machining in an extremely high vacuum‐adequate atmosphere increases surface hardness by up to 7.8% and induces compressive residual stresses ...
Benjamin Bergmann, Berend Denkena, Hilke Petersen, Florian Schaper   +3 more
wiley   +1 more source

Experimental study on interface frictional property between sand and concrete pipe jacking

地质科技通报, 2021
To reveal the shear friction mechanical mechanism between concrete pipe jacking and sand, obtain the friction coefficient of pipe-soil and pipe-slurry, and provide guidance and reference for the selection of pipe jacking construction parameters and the ...
Tianjiang Li, Xuefeng Chen, Weichao Chen, Xin Yuan   +3 more
doaj   +1 more source

Dynamic surface decoupling in a sheared polymer melt [PDF]

, 2005
We propose that several mechanisms contribute to friction in a polymer melt adsorbed at a structured surface. The first one is the well known disentanglement of bulk polymer chains from the surface layer.
Andrienko D., Cieplak M., Cottin-Bizonne C., D Andrienko, Grest G. S., K Kremer, Klein J., L. Delle Site, Leon S., Léger L., Persson B. N. J., X Zhou   +11 more
core   +2 more sources

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

Shear mechanical behaviors of ceramic proppant-infilled sandstone fractures under constant normal stiffness boundary conditions

Yantu gongcheng xuebao, 2023
The shear behavior of sandstone fractures filled with proppant has an important impact on tight gas production. In this study, the effects of normal stresses (1~6 MPa), normal stiffnesses (0~5 GPa/m), initial normal stresses (2~6 MPa) and proppant sizes (
WANG Gang 1, 2, WANG Pengju 1, WANG Changsheng 1, JIANG Yujing 3, 4, LUAN Hengjie 4, HUANG Na 1
doaj   +1 more source