scholarly journals Study of Dissipation Properties and Structure Evolution in Metals with Different Grain Size under HCF and VHCF Loadings

2016 ◽  
Vol 2 ◽  
pp. 2084-2090 ◽  
Author(s):  
O. Plekhov ◽  
O. Naimark ◽  
M. Narykova ◽  
A. Kadomtsev ◽  
V. Betechtin
Keyword(s):  
Grain Size ◽  
Structure Evolution ◽  
Different Grain Size

Study on the Behavior of the Cast-Iron Bonded Grinding Wheel to Machining Properties of Hard and Brittle Materials

2007 ◽  
Vol 24-25 ◽  
pp. 229-232
Author(s):  
S.L. Ma ◽  
Wei Li ◽  
Cong Rong Zhu ◽  
J. Zhang ◽  
H.C. Ye
Keyword(s):  
Grain Size ◽  
Cast Iron ◽  
Tungsten Carbide ◽  
Surface Quality ◽  
Ground Surface ◽  
Grinding Wheel ◽  
Different Grain Size ◽  
Grinding Efficiency ◽  
Machining Properties

Tungsten carbide which is a hard and brittle material was ground by cast-iron bonded diamond wheel with ELID (Electrolytic In-Process Dressing) technique, for the purpose of getting high efficiency, super-precision machining. Three kinds of cast-iron bonded diamond wheels with different grain size were adopted to get different grinding efficiency and surface quality of workpieces. The grinding properties of cast-iron bonded grinding wheels with different grain size and the ground surface quality of tungsten carbide are discussed in this paper. The experiment results indicate that, under the same feeding amount, the grinding efficiency of the wheel with bigger grain size is higher, and it could make the dimension accuracy of the workpiece controllable, but the wheel with smaller grain size could get better ground surface quality. The two grinding phases are decided by the ratio between the size of abrasive grain and the thickness of the oxide layer on the grinding wheel.

scholarly journals Improvement ratio and behavior of bearing capacity factors for strip skirt footing model resting on sand of different grain size distribution

2018 ◽  
Vol 162 ◽  
pp. 01026
Author(s):  
Mahmood Rashid Mahmood
Keyword(s):  
Grain Size ◽  
Bearing Capacity ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Coarse Sand ◽  
Linear Increase ◽  
Angle Of Internal Friction ◽  
Theoretical Approaches ◽  
Different Grain Size ◽  
Improvement Ratio

Plain strain model tests were performed on beds of sands with different particle size distribution (Coarse, Medium and Fine) prepared at loose state (Relative density Dr. of 30%). A strip footing model with skirt was placed on the bed of sand and loaded vertically up to failure at different ratios of skirt depth to width D/B of (0.5, 1.0, 1.5, 2, and 3). The applied stress increments and the corresponding settlements were measured. The improvement ratio due to different skirt depth and the behavior of bearing capacity parameters Nγ and Nq at each depth were evaluated and compared with some theoretical approaches. The test results revealed that the improvement ratio increased linearly up to D/B of 1.5 then reduced. Two factors were introduce into the general bearing capacity equation where used to evaluate bearing capacity of skirt footing, there values are about 1.6 for skirt ratio ranged between 0.5 to 1.5, and 1.25 for skirt ratio more than 1.5. Also, it is found that the Nγ parameter for D/B=0 were very close to Vesic proposal for fine and medium grain size distribution, while it’s close to Biarez proposal for coarse sand. The behavior of Nq parameter with different skirt ratio shows slight increase up to D/B of 1.5 then decrease with increasing D/B ratio for different grain size distribution. While the behavior of theoretical Nq parameter (depending on angle of internal friction values) shows a linear increase with skirt ratio for different grain size distribution.

The investigation of K-shell fluorescence parameters of Zn-Fe alloys with different grain size and microstrain values

2017 ◽  
Vol 46 (4) ◽  
pp. 242-251 ◽  
Author(s):  
N. Kup Aylikci ◽  
J.M. Sampaio ◽  
A. Kahoul ◽  
V. Aylikci ◽  
I.H. Karahan ◽  
...  
Keyword(s):  
Grain Size ◽  
Fluorescence Parameters ◽  
Fe Alloys ◽  
Different Grain Size

The Grain Size and Porosity Dependent Constitutive Modeling for Nanocrystalline Ceramics with Small Plastic Deformation

2007 ◽  
Vol 353-358 ◽  
pp. 50-53
Author(s):  
Jian Qui Zhou ◽  
Yuan Ling Li
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Published Data ◽  
Nanocrystalline Ceramics ◽  
Small Plastic ◽  
Consistent Method ◽  
Different Grain Size ◽  
Multi Phase ◽  
Small Plastic Deformation ◽  
Good Agreement

In order to understand the grain size and porosity dependent mechanical behavior of porous, multi-phase nanocrystalline ceramics, each phase is treated as a mixture of grain interior and grain boundary, and pores are taken as a single phase. In conjunction with the secant-modulus approach and iso-strain assumption, Budiansky’s self-consistent method is extended to build a constitutive model for nanocrystalline ceramics with small plastic deformation. Based on the developed model, the predicted yield strength (σ0.2) values of porous, multi-phase nanocrystalline ceramics with different grain size and porosity are compared with experimental data in the literature, the comparison shows that the predictions are in good agreement with the published data. This suggests that the developed model is capable of describing the grain size and porosity dependent mechanical behaviors of nanocrystalline ceramics with small plastic deformation.

scholarly journals Two Different Grain Size Distributions within the Protoplanetary Disk around HD 142527 Revealed by ALMA Polarization Observation

2018 ◽  
Vol 864 (1) ◽  
pp. 81 ◽  
Author(s):  
Satoshi Ohashi ◽  
Akimasa Kataoka ◽  
Hiroshi Nagai ◽  
Munetake Momose ◽  
Takayuki Muto ◽  
...  
Keyword(s):  
Grain Size ◽  
Protoplanetary Disk ◽  
Size Distributions ◽  
Polarization Observation ◽  
Grain Size Distributions ◽  
Different Grain Size
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