bluuebunny/crossref_metadata_2025_split huggingface dataset:
Normal mode finite element analysis of aerofoil wing structure with different materials
Authors: Asri M N A M , Abdullah N A Z , Fouzi M S M , Sani M S M 
Published: August 2019

Abstract
There are a lot of study regarding on the aircraft components. One of the critical components for an aircraft would be the wings. The wing structure of an aircraft is one of the complex structures of a designed aircraft. This paper is about identifying the modal properties which are the mode shape and the corresponding natural frequencies of the aircraft wing structure. The modal properties of the wing structure would be compared for two different materials applied towards the wing structures which are the aluminium alloy AA-7075-T6 and AA-2024-T3 which currently being widely used by the aircrafts. The study for this aircraft wing structure would be using the approach of finite element analysis (FEA) method. The 3D model is design by using SolidWorks. The modal properties are identified with the help of MSC PATRAN and MSC NASTRAN. The results obtained for both materials for 10 mode shapes are compared and it could be observed that AA-7075-T6 are much lower compared to AA-2024-T3. Hence, from the result, AA-7075-T6 is more suitable to be used for the wing structures.
Tremor Quantification and its Measurements Using Shimmer
Authors: Musab Reem , As’arry Azizan , Rezali Khairil Anas Md. , Abdul Jalil Nawal Aswan , Raja Ahmad Raja Mohd Kamil , Md Zain Mohd Zarhamdy 
Published: August 2019

Abstract
This study aimed to provide a quantitative assessment of parkinsonian tremor through the precise measurement of tremor among Parkinson patients while taking into consideration specific parameters including acceleration, velocity, and displacement. The parameters were obtained by using transducers. For this assessment, three-axis accelerometer and three axis gyroscopic transducers embed in one device called shimmer. In this present paper, sensitivity assessment was used to measure the severity of hand tremors in two positions; resting and postural. Besides, the researchers obtained rotational movement along with tremors’ acceleration movements. The amplitude and frequency was taken from Parkinson patients’ hand. Shimmer sensor showed excellent correspondence of amplitude and frequency measurement with rotational transducer. The frequency of the patient’s hand tremor occurred between 1.594 Hz and 4.813 Hz. However, the accelerometer showed poorer correspondence compared to gyroscope measurement. At the end, gyroscope responses are more remarkable because of the low level of muscle activity required in the task for precise tremor measurements to appear in high sensitivity to this impairment tremor.
The Effects of Posture on Suspension Seat Transmissibility during Exposure to Vertical Whole-Body Vibration
Authors: Aisyah Adam S. , Abdul Jalil N. A. , Razali K. A.Md , Ng Y. G. 
Published: August 2019

Abstract
Suspension seat is used in the off-road condition to attenuate excessive vibration exposed to the human body. The efficiency of a seat reducing vibration not only depends on the dynamic characteristics of the seat, but the dynamic characteristics of human body and the characteristics of the input vibration as well. Tractor drivers adopted different postures during their farm work activities, which may influence the dynamic characteristics of the human body. However, the influenced of the driver’s posture on suspension seat transmissibility has received less systematic attention. Thus, this study is carried out with the objective to investigate the effect of different postures on seat transmissibility when seated on a suspension seat. Three male subjects were exposed to random vibration at 2.0 m/s2 r.m.s with frequency ranging from 1-20 Hz, while seated on a vibration simulator for 60 seconds. The subjects adopted four seating postures: (i) relaxed, (ii) slouched, (iii) tensed and (iv) with backrest support. The study found that relaxed and slouched postures have a resonance frequency at 2.0 Hz. However, as the posture changed to backrest support, the resonance frequency of the seat transmissibility slightly increased by 0.25 Hz. This study suggested that changing the postures caused changes in the dynamics of human body, and thus affected the suspension seat transmissibility. It is concluded that, non-linearity in suspension seat transmissibility is influenced by the changes of body postures.
Finite Element Model Updating of Dissimilar Plate with Rivet Joint
Authors: Rahman H. A. , Khairi N. D. A. , Sani M. S. M. 
Published: August 2019

Abstract
This study focusses on experimental modal analysis (EMA), finite element analysis (FEA) and model updating. The result of FEA and EMA will be validated and analysed. Then, the study extended to the early stage of model updating by assuming that the riveted dissimilar plates is a rigid body instead of two dissimilar plates. These modal parameters are crucial in providing various periods at which it will naturally resonate to avoid the structure continue to resonate and experience structural damage. Modal parameters of the dissimilar plate with rivet joint which include natural frequency and mode shapes were determined through EMA and FEA. Comparison of experimental data and the simulation data reveals a good correlation between the values of natural frequency. Minor discrepancies of the percentage of error between EMA and FEA are acceptable with the percentage of error is within the range of 0.4% to 13%. Furthermore, the conducted model updating able to reduce to an error range of 0.03% to 0.1%. Through this study, the best way of conducting finite element analysis and model updating for dissimilar plate material with rivet joint is also determined.
Quasi in-situ EBSD characterization of the evolution of microtexture and microstructure in non-oriented electrical steels during cold rolling and annealing
Authors: He Y. , Mehdi M. , Sanjari M. , Hilinski E. J. , Kestens L. A. I. , Edrisy A. 
Published: August 2019

Abstract
Non-oriented electrical steel sheets are extensively used to manufacture core laminations for electric motors. The microstructure and crystallographic texture of the final thin sheets have a significant effect on the magnetic quality of the lamination core. Controlling the development of microstructure and texture during thermomechanical processing of these steels is of great practical importance. Although the final microstructure and texture of the steel sheets are affected by all the processing procedures employed, cold rolling and final annealing have the most direct effect since these are usually the final steps to process the steel. Although much effort has been made to study the evolution of microstructure and texture in non-oriented electrical steels, the formation mechanisms of the final microstructure and texture during annealing (especially grain growth) are still not completely understood, which is partially due to the fact that it is very difficult to directly investigate these processes using conventional characterization techniques. In this research, a quasi in-situ electron backscatter diffraction (EBSD) technique was presented, which enabled the tracking of the changes of the morphology and orientation of individual grains during cold rolling and the subsequent annealing process. The experiments revealed the rotations of individual grains under plane strain compression, and tracked the formation of nuclei from the deformed matrix and the growth of new grains during the recrystallization process. The results provided valuable insights into the evolution of microstructure and microtexture during cold rolling and annealing of non-oriented electrical steels, and helped understand the mechanisms that govern the nucleation and grain growth during recrystallization.
Analysing mobility from austenite grain growth data
Authors: Kranendonk Winfried 
Published: August 2019

Abstract
To obtain information on mobility of grain boundaries in austenite grain growth data has been collected from the open literature, to fit a physics-based grain growth model, which relates the mean grain size to the annealing time. The suitability of this model for predicting the grain size as a function of time is discussed and some preliminary results on the reduced mobility are presented. For the compositions in the database it has been found that the activation energy ranges from 100 to 600 kJ/mol. Such high activation energies cannot be explained well with many solute drag models.
Microstructural and micro hardness variation during low temperature recovery annealing in C-Mn high strength Steels
Authors: Janakiram S , Gautam Jai , Phani P Sudharshan , Kestens Leo A I 
Published: August 2019

Abstract
Recovery was studied in four different grades of steel, ULC, HSLA and DP600 and DP800 with varying C-Mn content. All the steels samples were 80% cold rolled and annealed at 300 and 500°C for 30, 60,120, 300 minutes, mainly to study the hardness and microstructural changes. Specimens were further tested using micro Vickers hardness tester. Microstructural changes were observed using scanning electron microscope. The cold rolled microstructure consisted of ferrite in ULC and ferrite-pearlite in HSLA, DP600 and DP800 steels. All the grains were pancaked and aligned in the rolling direction. The Hardness values increases for annealed specimens at 300 and 500°C in HSLA, DP600 and DP800 compared to cold rolled condition, which can be attributed to hardening of the ferrite matrix due to pinning of dislocations by carbon atoms. The hardness values for annealed specimens in ULC and DP800 decreases at 300 and 500°C which is attributed to softening.
The effect of microalloying elements on prior austenite grain growth of low-carbon slab material
Authors: Hannula J , Kaijalainen A , Porter D , Kömi J 
Published: August 2019

Abstract
The effect of microalloying elements on the prior austenite grain growth of slab materials during slab reheating has been investigated. The investigated materials were laboratory castings with two levels of carbon (0.05 and 0.09 wt.%) and different combinations of microalloying elements, such as V, Nb, Mo and Ti. Experimental results were compared to equilibrium Thermo-Calc® simulations predicting the solubility of different precipitates during slab reheating. Based on slab reheating experiments at temperatures between 1100 – 1250 °C, Ti is the only alloying element to hinder prior austenite grain growth effectively above 1200 °C. For the steel containing high carbon with Nb, V and Ti microalloying, the average prior austenite grain size was less than 50 μm after the slab reheating to 1250 °C, which can be considered very small. According to Thermo-Calc® calculations, stable Ti(CN) precipitates are formed from the liquid and are in solution until 1500 °C. Until 50-60 % of soluble NbC -precipitates, austenite grain size remained relatively small in Nb-alloyed compositions without Ti, but after that grain size increased drastically. For only V-alloyed steels, already at the soaking temperature of 1100 °C hardly any VC precipitates exists based on Thermo-Calc® simulations, and after that grain coarsening can be assumed to be controlled only by the coarsening rate of austenite grains.
Recrystallization and grain growth at the interface of a bimetallic colaminated strip composed of two different Fe-Ni alloys
Authors: Poncelet J , Baudin T , Oliveira M de , Waeckerlé T , Ateba-Betanda Y , Brisset F , Helbert AL 
Published: August 2019

Abstract
Roll bonding is a solid-state welding process widely used to manufacture layered metal composites. Particular properties may thus be obtained using the physical features of each material of the composite. Bimetal plates consisting of two different Fe-Ni alloys were made by roll bonding followed by heat treatment for 90 minutes at various annealing temperatures. The effects of post-rolling heat treatments on the bonding strength of a bimetal strip were investigated in relation to the interface microstructure evolution. Both recrystallization and grain growth took place at the interface during annealing. In particular, nucleation of new grains as well as growing grains crossing the interface may have contributed to the improvement of the bonding strength. Moreover, diffusion through the interface was found to drastically enhance the bonding strength from 850°C up to 1050°C. However, excessive grain growth associated to porosity occurrence probably caused the saturation of the bonding strength beyond 1050°C.
Grain sizes and dislocation densities in fcc-metallic materials processed by warm to hot working
Authors: Torganchuk V , Morozova A , Tikhonova M , Kaibyshev R , Belyakov A 
Published: August 2019

Abstract
Our just received results on the deformation microstructures evolved in a medium-Mn austenitic steel during large strain warm to hot rolling were analyzed with a reference to other alloys with face centred cubic lattices and relatively low stacking fault energies. The structural changes were characterized by the development of dynamic recovery (DRV) and dynamic recrystallization (DRX). The deformation grain size decreased while the dislocation density increased with a decrease in deformation temperature. Both the grain size and the dislocation density could be expressed by power law functions of temperature-compensated strain rate, i.e., Zener-Hollomon parameter, with exponents of -0.33 and 0.2, respectively, in the case of discontinuous DRX. On the other hand, the exponents of -0.1 and 0.06 were obtained for the grain size and dislocation density dependencies on the temperature-compensated strain rate, respectively, under conditions of warm deformation accompanied by DRV and continuous DRX. Therefore, a power law function could be obtained between the grain size and the dislocation density with a grain size exponent of -0.6, irrespective of the mechanisms of microstructure evolution in a wide range of deformation conditions.
The operative dynamic recrystallization mechanism of austenite during the transient deformation in a Ni-30%Fe model alloy
Authors: Chen Wenxiong , Zheng Chengwu , Dianzhong Li 
Published: August 2019

Abstract
Effect of strain rate and its discontinuous changes on dynamic recrystallization (DRX) behaviours of a Ni-30%Fe austenitic model alloy were investigated by hot compression tests. The results show that, during deformation at slow strain rates, DRX occurs with discontinuous nature, i.e. the DRX nuclei preferentially appear along initial grain boundaries followed by a quick growth through the strain-induced boundary migration (SIBM). Interestingly, during the further deformation after an abrupt increase in the strain rate, it can be found that the subgrains which developed in the first stage of deformation would gradually transform into new DRX grains. Therefore, in spite of the low stacking fault energy austenite, the continuous DRX (CDRX) is indeed possible to be activated during the transient deformation. The strain-induced sub-boundaries developed in the first deformation stages are believed to transform into higher-angle boundaries easily in further straining after abrupt increase of the strain rate. By this way, the CDRX mechanism in austenite is significantly promoted. Moreover, the local growth of new grains also plays an important role in this dynamic softening process.
Continuous dynamic recrystallization during hot torsion of an aluminum alloy.
Authors: Poletti M C , Simonet-Fotso T , Halici D , Canelo-Yubero D , Montheillet F , Piot D , Kovács Z , Schell N , Tolnai D 
Published: August 2019

Abstract
Most commercial aluminum alloys are characterized by dynamic recrystallization at very large deformations in a continuous manner. The present study deals with the characterization and modeling of the evolution of the microstructure of an aluminum wrought alloy at large plastic deformations. Hot torsion tests of the AA6082 aluminum alloy are carried out using the thermomechanical simulator Gleeble®3800 in a wide range of temperatures and strain rates. The use of water quenching immediately after deformation avoids any static restoration during cooling. Microstructural investigations are carried out by means of electron back scattered diffraction using a scanning electron microscope to determine the grain and subgrain structures, as well as the misorientation distributions. In-situ synchrotron radiation tests during hot torsion are used to confirm the continuous dynamic recrystallization (CDRX) by the evidence of the conversion of low angle boundaries (LAGBs) into high-angle boundaries (HAGBs) and the formation of new texture. Experimental investigations show that CDRX starts with the formation of LAGBs at low strains (center of the sample). By subsequent straining (close to the surface of the sample), the accumulation of dislocations at the LAGBs causes an increase in their misorientation until a critical value is reached and LAGBs transforms into HAGBs. The developed model consists of a microstructural model, equation rates and constitutive equations. The microstructure is described by three internal variables. Their rates are evaluated using the Kocks-Mecking model. The modelled and experimental flow stresses show softening due to the consumption of dislocations and the continuous formation of new HAGBs.
Utilization of rice fields for brick industries and farmers environmental awareness
Authors: Anwar R K , Rusmana A , Rizal E , Khadijah U L S 
Published: August 2019

Abstract
This paper discusses how farmers in Garut regency, West Java, convey the maintenance of environment awareness. This is important for the community because their activities in the brick industry have a very close relationship with the conversion of agricultural land. It was indicated by the fact that besides profit, there is also a loss. The existence of the brick industry will lead to the emergence of social problems and environmental problems. This study uses multiple case review methods. The cases consist of brick industry centers in Garut Regency. This study examines how peasants understand about soil maintenance. Interviews and observations are used to collect data. A face-to-face interview with the questionnaire was also developed for this study. The findings of the survey indicate that farmers’ societies do not think much about the consequences of their land-based economy. Nevertheless, there are efforts to cultivate the awareness of the farmers both from the government and non-government that can be communicated well to the community because it uses various media both traditional, modern and digital.
Patterns of variation magnetic properties and chemical elements of soil profile in landslide area of South East Sulawesi Indonesia
Authors: Eso Rosliana , Safiuddin La Ode , Bijaksana Satria , Ngkoimani La Ode , Agustine Eleonora , Tamuntuan Gerald , Tufaila M. , Syaf Hasbulah , Harudu La , Alfat Sayahdin , Usman Ida , Hasrorayan  , Ardin  
Published: August 2019

Abstract
Applications of the magnetic properties of rock continue to be developed because of its ability to integrate the understanding of the variation patterns of minerals and chemical elements in the process of soil formation and also their influence due to external factors . The primary objective of this study is to knowlege how the trends of variations of the magnetic properties and chemical elements on soil profile in landslide area, and how the association between the element as welpalal as the association between chemical elements and magnetic properties. Eleven soil profiles are the focus for the study of magnetic properties (parameter of magnetic susceptibility) and their elemental content (i.e., using the X-Ray Fluorescence, XRF). From the soil profiles studied, one hundred and twenty-four samples were taken and analyzed for their magnetic properties and elemental content. The results of this finding show that the trend of variation in magnetic susceptibility and chemical elements in soils differs from the normal soils and soils affected by human activity. The linear correlation between χLF and χFD values indicates that the soil profile in this study is a natural soil profile even though it has undergone changes due to landslides.
Utilization of activated carbon from coconut shell in remediating heavy metal waste in soil around mining area
Authors: Septiana L A E S , Hidayah A N , Laurencia A , Agustine E 
Published: August 2019

Abstract
Soil contamination by liquid waste that containing heavy metals in Jendi Village, Selogiri Sub-District, Wonogiri Regency has occurred for a long time. This situation is affected by the Traditional Gold Mining activity in that region. To overcome this problem, the authors utilize activated carbon from coconut shell as an easy, effective and environmentally friendly remediation method. In this research, activated carbon is believed can adsorb heavy metal waste around the gold mine area. This research was conducted from August 9, 2017 - December 28, 2017 by taking samples of waste in the gold mine area and applying 200 ml of the waste to a soil miniature. Parameters observed were Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS). The results show that the existence of heavy metal in soil is decreasing. So, the activated coconut shell carbon effectively in remediating soil that contaminated heavy metal waste.
Assessment of agricultural drought in paddy field area using Vegetation Condition Index (VCI) in Sukaresmi District, Cianjur Regency
Authors: Yulistya V D , Wibowo A , Kusratmoko E 
Published: August 2019

Abstract
Drought is a phenomenon which happens in spatial and temporal scale. One of the sectors affected is agriculture. In August 2015, a severe drought happened in Sukaresmi Village of Sukaresmi District causing harvest failures. This study aims to analyze the distribution of agricultural drought level of severeness in Sukaresmi District during August 2013 until August 2017 from spatial and temporal aspect by using VCI (Vegetation Condition Index) method and finding the correlation between the drought extent and rainfall data as the expected cause. The monitoring of agricultural drought in this study was carried out by utilizing remote sensing derived VCI by Kogan (1995). This index obtained after the NDVI value of Landsat 8 imageries in the given period normalized for each pixel. VCI shows how close the vegetation condition compared to its best and worst condition within the period. The result shows an agricultural drought in Sukaresmi District occurred throughout the years. 2015 was the year with the greatest average extent of agricultural drought. There is also a negative and weak (r = -0.212) correlation between the extent of drought and rainfall variable which means the climate did not mainly cause the phenomenon.