Results 41 to 50 of about 31,902 (254)

Permeability evolution of unloaded coal samples at different loading rates

Thermal Science, 2014
As coal mass is often at unloading status during mining process, it is of great significance to push on the research on permeability evolution of unloaded coal samples at different loading rates. A series of triaxial unloading experiments were conducted for initially intact coal samples using an improved rock mechanics testing system, and ...
Ze-Tian Zhang, Zhang Ru, Jian-Feng Liu, Xiao-Hui Liu, Jia-Wei Li   +4 more
openaire   +1 more source

Recycling of NiTi Shape Memory Alloys: Fundamental and Technological Aspects of a Vacuum Induction Melting Processing Route

Advanced Engineering Materials, EarlyView.
The present study investigates recycling of NiTi shape memory alloys via vacuum induction melting. An ingot was synthesized from elemental Ni and Ti and subjected to three subsequent remelting cycles. Remelting increases process durations and impurity levels and adversely affects microstructures and functional properties.
Sakia Sophia Noorzayee, Son Tung Mai, Sarath Menon, Braulio Gadiel Sánchez Ortega, Ralf Drautz, Alexander Kauffmann, Gunther Eggeler, Jan Frenzel   +7 more
wiley   +1 more source

Effect of stress unloading rate on fine-scale deformation mechanism of rock under high osmotic pressure

Frontiers in Earth Science
To explore the influence of the working face excavation rate on the rock deformation mechanism and seepage characteristics, deformation and seepage tests of sandstone under different loading and unloading stress paths, such as constant axial pressure ...
Weiji Sun, Xu Qin, Qiang Liu, Qiang Liu, Yujun Zhang, Wenfei Ma, Yangqi Ma, Jingang Gao, Jingang Gao   +8 more
doaj   +1 more source

Mechanical Characteristics of Coal Samples under Triaxial Unloading Pressure with Different Test Paths

Shock and Vibration, 2020
In order to understand the influence of unloading path on the mechanical properties of coal, triaxial unloading confining pressure tests with different initial confining pressure and different unloading rate were carried out.
Yang Zhang, Yongjie Yang, Depeng Ma
doaj   +1 more source

In Situ Micromechanical Study of Bimodal γ′–γ″ Precipitate Assemblies in Ni–Cr–Al–Nb Superalloy

Advanced Engineering Materials, EarlyView.
A Ni–Cr–Al–Nb superalloy with a bimodal γ′–γ″ precipitate distribution is developed. Composite precipitate assemblies form through heterogeneous nucleation, effectively impeding dislocation motion. Micropillar compression reveals high strength at room and elevated temperatures, governed by precipitate shearing, with coupled faulting mechanisms ...
Ujjval Bansal, Tae‐Hyeok Kang, Pyuck‐Pa Choi, Subin Lee, Christoph Kirchlechner   +4 more
wiley   +1 more source

Experimental Study on Mechanical Properties and Seepage Laws of Raw Coal under Variable Loading and Unloading Rates

Geofluids, 2021
This manuscript studied the effects of variable axial pressure loading rate and variable confining pressure unloading rate on the deformation behavior and seepage characteristics of raw coal under alternate loading and unloading of axial pressure and ...
Kangwu Feng, Kequan Wang, Dongming Zhang, Yushun Yang   +3 more
doaj   +1 more source

Molecular Dynamics Studies of Shape Memory Polymers: From Bead–Spring Models to Atomistic Simulations

Advanced Engineering Materials, EarlyView.
Coarse‐grained (left) and atomistic (right) models of the shape memory polymer ESTANE ETE 75DT3 are shown schematically. The two representations bridge molecular detail and mesoscopic description. Both models capture shape memory behavior, linking segmental mobility and conformational relaxation of anisotropic chains to macroscopic recovery, and ...
Fathollah Varnik
wiley   +1 more source

An Evaluation Method of Brittleness Characteristics of Shale Based on the Unloading Experiment

Energies, 2019
Shale reservoir has an initial unloading effect during the natural uplift and erosion process, which causes the shale brittleness to change, affecting the design of the fracturing scheme.
Xiaogui Zhou, Haiming Liu, Yintong Guo, Lei Wang, Zhenkun Hou, Peng Deng   +5 more
doaj   +1 more source

Experimental Characterization and Constitutive Modeling of the Effect of Prior Inelastic Strain on the Viscoplastic Behavior of AD730 at 700 °C

Advanced Engineering Materials, EarlyView.
This study shows that superalloys used in aircraft engine disks become much more prone to deformation at high temperatures if they have been strained during manufacturing. This effect increases with the level of prior strain but eventually reaches a limit.
Fabio Machado Alves da Fonseca, Patrick Villechaise, Malik Durand, Arnaud Longuet, Florent Coudon, Loïc Signor, Julien De Jaeger, Dominique Eyidi, Nathalie Bozzolo, Jonathan Cormier   +9 more
wiley   +1 more source

Study on mechanical properties and energy evolution characteristics of proppant-containing sandstone under unloading conditions

Meikuang Anquan
To investigate the effects of unloading on the failure mechanical properties and energy evolution characteristics of proppant-containing sandstone, triaxial compression contrast tests were carried out on proppant-containing sandstone specimens using a ...
Shilong LIU, Wenpu LI, Tao WANG, Xinyu ZHANG, Zikun ZHAO   +4 more
doaj   +1 more source