Iraqi Journal for Mechanical and Materials Engineering最新文献_第8页

STUDY SOME PHYSICAL PROPERTIES OF POLYMERIC BLENDS (SR/ PMMA) 聚合物共混物(sr / pmma)的物理性能研究

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-01-06 DOI: 10.32852/IQJFMME.V18I4.235

S. Salih, Jawad K. Oleiwi, H. M. Ali

{"title":"STUDY SOME PHYSICAL PROPERTIES OF POLYMERIC BLENDS (SR/ PMMA)","authors":"S. Salih, Jawad K. Oleiwi, H. M. Ali","doi":"10.32852/IQJFMME.V18I4.235","DOIUrl":"https://doi.org/10.32852/IQJFMME.V18I4.235","url":null,"abstract":"Many face organs are exposed to different environmental conditions in terms of different ofambient temperature, degradation, discoloration, changes in humidity and especiallyfrequent washing of these organs. These conditions cause changes in the structure ofmaterials so, for restoring the function and improving aesthetics of the affected areas ofmaxillofacial by surgical reconstruction and prosthetic rehabilitation the silicone rubbers(SR) and PMMA are the materials of choice. So that, the aim of this research is toinvestigate the effect of addition of polymethyl methacrylate (PMMA) material on thephysical properties of blends from SR/PMMA at different weight percentage (5%, 10%,15% and 20%) of PMMA to silicone rubber. Fourier transform infrared spectrometer test )FTIR(, density, water absorption and thermal properties were done on the all preparedsamples, which are used for maxillofacial prostheses applications. The results showed thatthere is good correlation in FTIR spectrum for reference silicone rubber and (SR/PMMA)polymer blend and this confer a good compatibility between silicone rubber matrix materialand PMMA. As well as the physical properties showed that the favorite percent of PMMA is10% which has ideal characteristic. So, this sample may be a suitable material to achieve theproperties required for maxillofacial prosthetic applications.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47836401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

IMPROVED CELLULAR MANUFACTURING SYSTEM USING PARTICLE SWARM OPTIMIZATION 基于粒子群优化的改进元胞制造系统

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-01-05 DOI: 10.32852/IQJFMME.V18I4.223

D. A. Kadhim

引用次数: 0

NUMERICAL OPTIMIZATION OF SANDWICH COMPOSITE STRUCTURE UNDER FLEXURAL LOAD 弯曲荷载作用下夹层复合材料结构的数值优化

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-01-05 DOI: 10.32852/IQJFMME.V18I4.224

E. Fadhel

{"title":"NUMERICAL OPTIMIZATION OF SANDWICH COMPOSITE STRUCTURE UNDER FLEXURAL LOAD","authors":"E. Fadhel","doi":"10.32852/IQJFMME.V18I4.224","DOIUrl":"https://doi.org/10.32852/IQJFMME.V18I4.224","url":null,"abstract":"The structures of a sandwich composite have been utilized in the aerospace industry andengineering applications. Prediction of a theoretical composite construction's flexuralproperties is important for efficient composite products design. In this investigation, fourdifferent core shapes were used in the fabrication of the sandwich frames with constantvolume of sandwich composite structure in each case; these are hexagonal, rectangular,triangular and circular. The effect of core stiffeners number was studied to finding the beststiffeners number which gives the highest properties in strength using the finite elementanalysis.The material of the each face sheet is consisting from epoxy with four layers of a wovenfiberglass laminate construction, and the core stiffener material consists from epoxy matrixwith carbon fiber, the fiber volume fraction was 60% for both skins and core composites.The analysis of the three point bending load with a value of (10 kN) conducted byconstructing a finite element model, explained that the best shape of core was rectangularwhich give less deflection value of (11.939 mm) from the other shapes, for the sameproperties of material and constant core volume in each case. Also, it was determined theoptimum stiffeners number, for the rectangular core, was five stiffeners in longitudinaldirection and twelve stiffeners in transverse direction, gives strengthen structure.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48405331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

DYNAMIC BEHAVIOUR OF SANDWICH PLATE WITH DIFFERENT CORE CONFIGURATION UNDER ACTION OF IMPULSIVE LOADING 不同芯型夹芯板在冲击载荷作用下的动力特性

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-01-05 DOI: 10.32852/IQJFMME.V18I4.226

A. Nemah, Hatem H. Obied

{"title":"DYNAMIC BEHAVIOUR OF SANDWICH PLATE WITH DIFFERENT CORE CONFIGURATION UNDER ACTION OF IMPULSIVE LOADING","authors":"A. Nemah, Hatem H. Obied","doi":"10.32852/IQJFMME.V18I4.226","DOIUrl":"https://doi.org/10.32852/IQJFMME.V18I4.226","url":null,"abstract":"Steel sandwich structures with honeycomb and corrugated cellular cores have demonstrated the capability of supporting significant static bending loads while also enabling effective mitigation of impulse loads, the main objectives to use these structures is weight reduction and isolate or reduce the deflection and stress. This research aims to study the effect of dynamic load on the dynamic properties of various types of sandwich cores then find the best model that withstand high stresses and dissipate loads with less mass was possible. The studied model of sandwich is of dimensions (500x500x100) mm with five cells. Four types of steel sandwich plate (SSP) finite element models of various core types have been created: (1) triangle corrugated core, (2) trapezoid corrugated core, (3) square honeycomb and (4) out-of plane hexagonal honeycomb, the mass of various types was constant with value of 13.75 kg. The SSP types were compared by using ANSYS (15.0) APDL software.The finite element models are examined under the effect of transient concentrated stepped load of (350N) during 10ms. The time history response showed that the minimum von-Mises stress and minimum deflection occur at triangle corrugated SSP with values of stress (12.5Mpa) and deflection (3.8 ), but in energy absorption the square honeycomb is the best type with reduction of stress (99.65%) and reduction of deflection of (98.95%).","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43528170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

MATHEMATICAL MODEL TO INVESTIGATE THE DRAG REDUCTION OF KEROSENE WITH POLYMER UNDER TURBULENT FLOW 湍流条件下聚合物对煤油减阻的数学模型研究

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-01-05 DOI: 10.32852/IQJFMME.V18I4.222

A. Alwan, Ali J. Mohammad

{"title":"MATHEMATICAL MODEL TO INVESTIGATE THE DRAG REDUCTION OF KEROSENE WITH POLYMER UNDER TURBULENT FLOW","authors":"A. Alwan, Ali J. Mohammad","doi":"10.32852/IQJFMME.V18I4.222","DOIUrl":"https://doi.org/10.32852/IQJFMME.V18I4.222","url":null,"abstract":"This paper present a mathematical study on drag reduction by polymer additive suchas poly isobutylene (PIB) with kerosene in turbulent pipe flow by using computational fluiddynamic commercial package program (COMSOL 4.4) solution. Theoretically thecomputational study was used to calculate the pressure drop in two dimensions geometricmodel with 6m length and 80 mm width as a diameter of the pipe, Geometric shape has beendrawing by tools of the program windows, and to simulated the flow region mathematicallythe flow region is divide into very small parts (mesh generation). The model that used in themathematical modelling method was (k-?( mathematical turbulent model to study theinternal pipe flow properties. The continuity and momentum equations and two k-? modelequations have been solved by the program to obtain the theoretical results. There variablesthat used in the theoretical study were effective density, effective viscosity, inlet velocity,and outlet pressure. The boundary condition was inlet and outlet velocity, temperature, andpressure of flow, and the velocity (u=0) at the pipe wall. The theoretical calculations showthat the velocity and drag reduction percentage increases with polymer concentration andvolume flow rate increasing where maximum DR% is 15.8% at volume flow rate 500 ??minwith polymer concentration 100 ppm, pressure drop decreases with polymer concentrationincreasing. Friction factor decreases with polymer concentration increased, also shear stressdecrease with polymer concentration increasing.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45412734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DURABILITY OF THE OIL PIPELINE SYSTEMS UNDER ENVIRONMENTAL EFFECTS 环境影响下石油管道系统的耐久性

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-01-01 DOI: 10.32852/iqjfmme.v18i4.228

S. Beden, A. Battawi, A. Shahrum

引用次数: 0

EFFECT OF ARTIFICIAL CAVITIES ON HEAT TRANSFER AND FLOW CHARACTERISTICS MICROCHANNEL 人工空腔对微通道传热及流动特性的影响

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2019-01-01 DOI: 10.32852/iqjfmme.v20i3.511

S. Mohammed, Ekhlas M. Fayyadh

{"title":"EFFECT OF ARTIFICIAL CAVITIES ON HEAT TRANSFER AND FLOW CHARACTERISTICS MICROCHANNEL","authors":"S. Mohammed, Ekhlas M. Fayyadh","doi":"10.32852/iqjfmme.v20i3.511","DOIUrl":"https://doi.org/10.32852/iqjfmme.v20i3.511","url":null,"abstract":"An experimental investigation was conducted to study single-phase fluid flow and heat transfer in a copper micro channel. To investigate the effect of artificial cavities on fluid flow and single phase heat transfer in micro channel heat sink, two model of straight micro channel recognized as two models (model -1and model -2) were designed and manufactured ,where model-1 have smooth bottom surface while Model-2 have 47 artificial cavities distributed uniformly at the bottom surface along the micro channel length. The two models having the same nominal dimension of 300?m height and 300?m depth while the real dimension value are 367 ?m for width and 296 ?m for depth .De-ionized water was used as the working fluids. Experimental test was conducted at 30?C inlet temperature with Reynolds numbers range from 700 to 2200 covering laminar flow conditions. The experiments were conducted with horizontal micro channel under both adiabatic (for friction factor calculation) and diabatic (for Nusselt number calculation) conditions. The results indicated that the experimental Darcy friction factor can be predicted well with conventional scale fanning friction factor correlations for developing flow in laminar region by shah and London (1978) correlation for two models. Also, the experimental Nusselt number Agree well with each correlation of shah and London (1978) and Mirmanto correlation in laminar region.","PeriodicalId":31812,"journal":{"name":"Iraqi Journal for Mechanical and Materials Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70181331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

THERMAL PERFORMANCE OF PARABOLIC TROUGH SOLAR COLLECTOR 抛物面槽式太阳能集热器的热性能

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-11-06 DOI: 10.32852/IQJFMME.V18I3.172

K. Amori, R. R. Sari

引用次数: 2

STUDYING THE EFFECT OF POLYVINYLPYRROLIDONE (PVP) ON CHARACTERIZATION OF ZNO NANOPARTICLES SYNTHESIZED BY SOL – GEL METHOD 聚乙烯吡咯烷酮（PVP）对溶胶-凝胶法制备ZNO纳米粒子性能影响的研究

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-11-06 DOI: 10.32852/IQJFMME.V18I3.181

S. Kareem

引用次数: 1

THE EFFECT OF FINS PERFORATION AND MATERIAL TYPE ON THERMAL PERFORMANCE OF A HEAT SINK UNDER NATURAL CONVECTION 翅片穿孔和材料类型对自然对流下散热器热性能的影响

Iraqi Journal for Mechanical and Materials Engineering Pub Date : 2018-11-06 DOI: 10.32852/IQJFMME.V18I3.179

M. A. Hussein, Mohammed I Makhoul

引用次数: 4