Study on the Ductile Removal Behavior of K9 Glass with Nano-Scratch

2016 ◽  
Vol 1136 ◽  
pp. 282-288 ◽  
Author(s):  
Zhi Peng Li ◽  
Hang Zhao ◽  
Fei Hu Zhang
Keyword(s):  
Brittle Material ◽  
Normal Load ◽  
Load Condition ◽  
Removal Process ◽  
Pile Up ◽  
Hard And Brittle Material ◽  
Conventional Machining ◽  
Ductile Removal ◽  
K9 Glass ◽  
Process Material

Ductile removal behavior of hard and brittle material in the process of machining has always been a sticking topic. A series of nanoscratch tests of K9 glass were conducted with Berkovich probe on nanoindenter XP to investigate the ductile removal process, material deformation and crack damage. It was found that the scratches surface was free from crack damage in the range of the selected scratching parameters and excellent machinability of K9 glass was obtained. The observation also showed that the stable chips were distributed on the sides of the scratches and the deformation of chips was much larger than that obtained in the conventional machining. Meanwhile, a pile-up phenomenon was obvious and the residual depth of scratches was decreased with the increasing of scratch velocity under the same normal load condition.

scholarly journals Study on Nano-Machining of Hard and Brittle Material with Focused Ion Beam

2008 ◽  
Vol 74 (5) ◽  
pp. 491-497
Author(s):  
Nobuhiko TAKAHASHI ◽  
Hayato YOSHIOKA ◽  
Hidenori SHINNO
Keyword(s):  
Brittle Material ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Hard And Brittle Material

Rock joint modeling using a visco-plastic multilaminate model at constant normal load condition

2006 ◽  
Vol 24 (5) ◽  
pp. 1449-1468 ◽  
Author(s):  
Reza Mahin Roosta ◽  
Mohammad Hossein Sadaghiani ◽  
Ali Pak ◽  
Yaser Saleh
Keyword(s):  
Normal Load ◽  
Rock Joint ◽  
Load Condition ◽  
Joint Modeling ◽  
Constant Normal Load ◽  
Constant Normal Load Condition

Hybrid Non Conventional Machining of Glass - A Review

2019 ◽  
Vol 895 ◽  
pp. 8-14 ◽  
Author(s):  
Y. Nagaraj ◽  
N. Jagannatha ◽  
N. Sathisha
Keyword(s):  
Surface Finish ◽  
Machining Process ◽  
Machining Processes ◽  
Advantages And Disadvantages ◽  
Good Surface ◽  
Hard And Brittle Material ◽  
Good Surface Finish ◽  
Output Characteristics ◽  
Conventional Machining ◽  
Selection Of

Glass, being considered as hard and brittle material is very difficult to machine into desired shapes. The readily available conventional machining process does not provide good surface finish thus requires additional machining process. This paper reviews the different existing non conventional machining process accessible till today for the machining of glass materials. This paper also discusses the advantages and disadvantages of the existing non conventional machining processes. The various hybrid non conventional machining processes are also studied with focus on machining output characteristics like MRR, surface finish, tool wear rate. This paper summarizes the selection of hybrid non conventional machining processes for the various type of glass.

Simulation Research on EDF Scheduling Algorithm of CAN Network Based on OPNET

2012 ◽  
Vol 433-440 ◽  
pp. 5102-5106
Author(s):  
Jie Chang Wu ◽  
Jia Hao ◽  
Chao You Guo
Keyword(s):  
Real Time ◽  
Normal Load ◽  
Scheduling Algorithm ◽  
Load Condition ◽  
Transmission Delay ◽  
Data Frame ◽  
Average Delay ◽  
Real Time System ◽  
Simulation Research ◽  
Set Up

In order to analyze and evaluate real-time performance of CAN network, the OPNET models of CAN network with Fixed Priority Scheduling (FPS) and Earliest Deadline First (EDF) have been set up in this paper. Based on simulation experiments, the performances of average delay and transmission success ratio in the two models are analyzed and the experiments also indicate that under normal load condition the two scheduling algorithm both can send data frame successfully before the deadline. In a slight overload condition FPS algorithm makes the transmission delay of low priority data frame significantly increased, and even occurs the phenomenon that low priority data frame can not be sent at all times; while the EDF algorithm can make all the nodes to complete the data frames in less than 3ms transmission delay, it meets the delay requirements that are delay should less than 10ms in most control systems, it indicates that EDF algorithm has the better scheduling and availability in soft real-time system.

scholarly journals Some Aspects of Shear Behavior of Soft Soil–Concrete Interfaces and Its Consequences in Pile Shaft Friction Modeling

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2578
Author(s):  
Jakub Konkol ◽  
Kamila Mikina
Keyword(s):  
Shear Strength ◽  
Normal Load ◽  
Soft Soil ◽  
Load Condition ◽  
Initial Stiffness ◽  
Friction Modeling ◽  
Interface Failure ◽  
Friction Behavior ◽  
Constant Normal Load ◽  
Concrete Interface

This paper examines the stiffness degradation and interface failure load on soft soil–concrete interface. The friction behavior and its variability is investigated. The direct shear tests under constant normal load were used to establish parameters to hyperbolic interface model which provided a good approximation of the data from instrumented piles. Four instrumented piles were used to obtain reference soil–concrete interface behavior. It was found that the variability of the friction characteristics is the highest for organic clays and the lowest for organic silts. The intact samples exhibit lower shear strength than reconstituted ones. The adhesion varies significantly depending on interface and soil type, which can result in high scatter of the skin friction prediction. The analysis of parameters variability can be used to determine the upper and lower bound of friction behavior on the interface at constant normal load condition. The backward shearing results in decrease in shear strength up to 40% of the precedent forward phase but higher initial stiffness by a factor of between 2 and 3. Presented research provides basic shear and stiffness parameters for four soft soils (organic clay, organic silt, peat, and silty loam) and gives information about variability of interface characteristics.

scholarly journals Some aspects of fretting fatigue under cyclic normal loading

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Farshad Abbasi ◽  
G. H. Majzoobi
Keyword(s):  
Fatigue Life ◽  
Fatigue Testing ◽  
Normal Load ◽  
Testing Machine ◽  
Low Frequency ◽  
Load Condition ◽  
Fretting Fatigue ◽  
Normal Loading ◽  
Drastic Effect ◽  
Fretting Damage

Fretting fatigue has been studied mainly under constant normal loading, as it requires simple equipment which can be assembled on a universal fatigue testing machine. Recently, we [1] have introduced an innovative fretting fatigue apparatus in which the contact pressure can independently be varied during the test. In a recent publication [2] we have investigated the effect of normal load frequency on fretting fatigue life of Al7075-T6 under cyclic normal load condition. It was found that the low frequency of normal load has drastic effect on fretting fatigue life. The effect, however, gradually diminishes with the frequency increase and vanishes at the frequency of around 80Hz. In another publication [3] we have compared the results of constant normal loading with those of in phase, 90° and 180° degrees out-of-phase loadings. It was found that the constant normal loading has the least fretting damage, while the maximum fretting damage occurs by in-phase loading. The results also showed that the out-of-phase loading had improving effect on fretting fatigue life with respect to the in-phase condition. Recently, Ciaverella [4] has published a discussion on our publications [2, 3]. He believes that some of our experimental results needs further discussion. Therefore, the objective of this article is to answer three main points he has raised in his article [4]. We hope that this discussion could lead to some progress.

Correlating acoustic emission sources with damaged zones during direct shear test of rock joints

2012 ◽  
Vol 49 (6) ◽  
pp. 710-718 ◽  
Author(s):  
Z.A. Moradian ◽  
G. Ballivy ◽  
P. Rivard
Keyword(s):  
Acoustic Emission ◽  
Acoustic Waves ◽  
Normal Load ◽  
Rock Joint ◽  
Load Condition ◽  
Rock Joints ◽  
Joint Surfaces ◽  
Rock Cores ◽  
Asperity Degradation ◽  
Constant Normal Load Condition

Applicability of acoustic emission (AE) for localizing asperity damaged zones and damage intensity in joint surfaces was evaluated in this paper. With this attempt, rock joint samples obtained from tension splitting of the rock cores were tested under constant normal load condition. The locations of the AE sources were determined from propagation velocity of acoustic waves and by measuring the transferring time from event source to AE sensor. These sources correspond to asperity damaged zones. The AE signals generated from asperity degradation of joint surfaces were detected during shear testing. The energy of the generated signals was also measured to assess the intensity of the asperity failure. The results of this study showed that the AE method has a good capability in localizing the asperities’ failure points and the intensity (energy) of the asperities’ failure.

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