Results 31 to 40 of about 6,852 (256)

Mechanical response and brittle-ductile transition of porous sandstone under true-triaxial loading

Journal of Rock Mechanics and Geotechnical Engineering
This study investigates the influence of mean stress and Lode angle on the mechanical behavior of porous sandstone. Sandstone specimens were tested using a newly developed true-triaxial loading apparatus under five constant Lode angle conditions and ...
Junjie Xiao, Xing Li, Jiacun Liu, Dongping Liu, Kaiwen Xia   +4 more
doaj   +1 more source

Experimental Study on the Brittle-Ductile Response of a Heterogeneous Soft Coal Rock Mass under Multifactor Coupling

Geofluids, 2019
After a gas drainage event causes different degrees of initial porosity in the coal seam, the heterogeneity of the coal mass becomes much more obvious. In this paper, soft coal testing samples with different degrees of heterogeneity were prepared first ...
Weijian Yu, Genshui Wu, Baifu An, Ping Wang   +3 more
doaj   +1 more source

Surface Morphology Evaluation and Material Removal Mechanism Analysis by Single Abrasive Scratching of RB-SiC Ceramics

Crystals, 2022
Reaction-Bonded Silicon Carbide (RB-SiC) ceramics possessing excellent mechanical and chemical properties, whose surface integrities have an essential effect on their performance and service life, have been widely used as substrates in the core parts of ...
Zhangping You, Haiyang Yuan, Xiaoping Ye, Liwu Shi   +3 more
doaj   +1 more source

The brittle/ductile transition in cubic stabilised zirconia

Journal of the European Ceramic Society, 1994
Abstract Cubic zirconia has a smooth brittle/ductile transition above 800°C at a loading rate of 1·2 × 10 −4 MPa m s −1 . Pre-stressing at 950°C increases the room temperature fracture toughness in a controllable manner. The toughness increase is caused by dislocation shielding of the crack tip and may be predicted using a model ...
Marrow, T, Roberts, S, Pearcehiggins, A
openaire   +1 more source

Phase Field Failure Modeling: Brittle‐Ductile Dual‐Phase Microstructures under Compressive Loading

Advanced Engineering Materials, EarlyView.
The approach by Amor and the approach by Miehe and Zhang for asymmetric damage behavior in the phase field method for fracture are compared regarding their fitness for microcrack‐based failure modeling. The comparison is performed for the case of a dual‐phase microstructure with a brittle and a ductile constituent.
Jakob Huber, Jan Torgersen, Ewald Werner
wiley   +1 more source

Suppressing scratch-induced brittle fracture in silicon by geometric design modification of the abrasive grits

Journal of Materials Research and Technology, 2019
The overarching goal of this research was to investigate the application of spherically shaped abrasive particles in achieving ductile-mode cutting. Scratching experiments were carried out to assess the differences between arbitrarily and spherically ...
Andrii M. Kovalchenko, Saurav Goel, Islam M. Zakiev, Evgeniy A. Pashchenko, Rajab Al-Sayegh   +4 more
doaj   +1 more source

Karl Popper and the Mechanisms of Hydrogen Embrittlement

Advanced Engineering Materials, EarlyView.
Representation of the beginning of loss of ductility rather than embrittlement. Small concentrations of hydrogen in a diffusible form within iron are well‐established to harm the mechanical integrity of steels. There are theories that attempt to explain the pernicious role of hydrogen.
H. K. D. H. Bhadeshia
wiley   +1 more source

In-situ experiment on critical thickness of brittle-ductile transition of single-crystal silicon

工程科学学报, 2019
Single-crystal silicon is widely used in optoelectronics and micro-electromechanical systems because of its unique physical and chemical properties.
LIU Bing, XU Zong-wei, LI Rui, HE Zong-du   +3 more
doaj   +1 more source

Brittle–Ductile Transition and Dislocation Mobility in Sapphire

Journal of the American Ceramic Society, 1994
The brittle‐to‐ductile transition (BDT) of Precracked sapphire in four‐point bending was studied as a function of orientation and strain rate from room temperature to 1500°C. Plastic deformatiom of sapphire occurs via basal and prismatic slip during loading at high temperature (above 1030–1100°C, depending on orientation).
Kim, H, Roberts, S
openaire   +1 more source

Understanding the Stochastic Nature of Process Parameter Development of Blown Powder Laser Beam Directed Energy Deposition Additive Manufacturing of Pure Molybdenum

Advanced Engineering Materials, EarlyView.
Identified through the use of statistical design of experiments and metallographic investigation, this study exposes the stochastic origins of intergranular cracks in blown powder laser beam directed energy deposition additive manufacturing of pure molybdenum. It further demonstrates a successful crack mitigation approach with direct correlation to the
Nathaniel J. Lies, Daniel E. Driemeyer, Aaron P. Stebner   +2 more
wiley   +1 more source