CAE and Intelligent Processing of Polymeric Materials最新文献

Evaluation of Process Control During On-Line Consolidation of Thermoplastic Composites 热塑性复合材料在线固结过程控制评价

CAE and Intelligent Processing of Polymeric Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0627

C. Pistor, M. Yardimci, Raoul Castro, S. Güçeri

{"title":"Evaluation of Process Control During On-Line Consolidation of Thermoplastic Composites","authors":"C. Pistor, M. Yardimci, Raoul Castro, S. Güçeri","doi":"10.1115/imece1997-0627","DOIUrl":"https://doi.org/10.1115/imece1997-0627","url":null,"abstract":"\u0000 Laser assisted tape winding is a manufacturing technique to produce thermoplastic composite parts of high quality. It is an additive semi-freeform fabrication process that utilizes thermoplastic composite prepreg tape as the base material. The tape is fused by the heat delivered from a laser beam, while it is wound onto a cylindrical mandrel. To ensure proper consolidation to the substrate, a roller applies the necessary compaction pressure.\u0000 The fabrication of high quality rings with circular (Beyeler, 1988 and Irwin, 1994) and non-circular (Pistor et al. 1995) shape using quarter inch wide prepreg tape (PPS/Carbon, PEEK/Carbon) has been successfully demonstrated. The shape of the beam utilized in these investigations was determined by a series of lenses that formed the circular beam of the CO2 laser into a vertical narrow ellipse approximately 6.4 mm high and 2 mm wide (Pistor et al., 1995). The area illuminated by the infrared laser was therefore preset and not adjustable, limiting the set-up to the processing of quarter inch wide tape.\u0000 One of the advantages of using a laser beam for the consolidation of thermoplastic resins is the that extremely high heat trnsfer rates to the resin are possible. This can be exploited not only for laser power adjustments in response to variations in tape laying velocity (Pistor et al., 1995), but also for scanning of a circular beam spot over the desired consolidation area. For the described set-up, a vertical slit of adjustable height was realized by scanning the laser beam vertically with a frequency of 100–500 Hz. Scanning height and frequency as well as motion and laser power are computer controllable.","PeriodicalId":220828,"journal":{"name":"CAE and Intelligent Processing of Polymeric Materials","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125437618","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

Rotational Molding of Low-Density LLDPE Foams 低密度LLDPE泡沫塑料的旋转成型

CAE and Intelligent Processing of Polymeric Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0618

Guobin Liu, Chul B. Park, J. Lefas

引用次数: 3

Intelligent Processing of Carbon-Black Loaded Plastics 炭黑负载塑料的智能加工

CAE and Intelligent Processing of Polymeric Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0635

V. Bouda

引用次数: 1

Orientation Formation in Planar Mold Filling: Theory and Numerical Predictions 平面充型中的取向形成:理论与数值预测

CAE and Intelligent Processing of Polymeric Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0637

Jufang He, K. Olivero, M. Altan

{"title":"Orientation Formation in Planar Mold Filling: Theory and Numerical Predictions","authors":"Jufang He, K. Olivero, M. Altan","doi":"10.1115/imece1997-0637","DOIUrl":"https://doi.org/10.1115/imece1997-0637","url":null,"abstract":"\u0000 Orientation formation in a steady, Newtonian, Hele-Shaw flow containing rigid, neutrally buoyant, slender fibers is numerically analyzed. The Hele-Shaw model is used to simulate flows through mold cavities consisting of thin planar sections. In this study, orientation results are calculated for a mold cavity containing a three to one sudden contraction. The suspension is injected from a single inlet gate at constant volume flow rate. Initially, the planar stream function is numerically solved by an Eulerian finite difference method to obtain the flow field. Subsequently, a Lagrangian particle tracking method is used to calculate the orientation field from the flow kinematics. The three-dimensional orientation formation throughout the mold cavity is obtained by a new method which calculates the second-order orientation tensors directly from flow kinematics and particle aspect ratio. With this new method, time-consuming integrals and inaccurate closure approximations commonly used in orientation calculations are avoided. The rotational dynamics of each particle are described by Jeffery’s theory. The numerical results are valid for multi-particle, dilute suspensions in which the orientation field can be fully described by the second-order moment of the orientation probability density function (OPDF). The orientation results are presented at different layers through the thickness of the mold cavity, ranging from the midplane to the top wall. In addition, the second-order orientation tensor is averaged through the mold thickness at a number of points in the vicinity of sudden contraction. These averaged orientation tensors are compared with the experimental data obtained from the same flow configuration by Olivero et al. (1997).","PeriodicalId":220828,"journal":{"name":"CAE and Intelligent Processing of Polymeric Materials","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127066307","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

Calculation and Optimisation of the Feeding System in Thermoplastics Injection 热塑性塑料注射喂料系统的计算与优化

CAE and Intelligent Processing of Polymeric Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0644

N. Van Rutten, F. Dupret

引用次数: 0

A Novel Process Control for Injection Molding Based Upon On-Line CAE Systems 基于在线CAE系统的新型注射成型过程控制

CAE and Intelligent Processing of Polymeric Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0634

Pei-Jen Wang, Jin-Yow Lin

{"title":"A Novel Process Control for Injection Molding Based Upon On-Line CAE Systems","authors":"Pei-Jen Wang, Jin-Yow Lin","doi":"10.1115/imece1997-0634","DOIUrl":"https://doi.org/10.1115/imece1997-0634","url":null,"abstract":"\u0000 A novel process control system for injection molding based on the integration of Computer Aided Engineering systems (CAE) and process control models has been studied and verified. The objective is to develop a scientific approach for on-line process control by making use of the results from the CAE systems. Initially, the design of injection molded products should be finished with the help of the CAE systems after the dimensions of the products have been determined. From a set of process conditions given by the CAE results, an automatic design of experimentation procedure was conducted for locating the processing window. The processing window was then employed as the CAE inputs for establishing a process model by employing adaptive fuzzy-neural networks. In addition, a set of quasi-optimal process condition was achieved if an optimization objective had been determined based on production requirement. Finally, appropriate cycle-to-cycle control actions on tuning process conditions were taken while the pertinent feedback signals from the process were stored. This process control methodology has been demonstrated with test cases showing promising results.","PeriodicalId":220828,"journal":{"name":"CAE and Intelligent Processing of Polymeric Materials","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127857010","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

Finite Element Prediction of Sink Marks in Injection Molded Plastic Parts 注塑件凹痕的有限元预测

CAE and Intelligent Processing of Polymeric Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0639

D. J. Battey, M. Gupta

引用次数: 0

Real-Time Resin Temperature Measurements for Polymer Processing Using Fluorescence Spectroscopy 荧光光谱用于聚合物加工的实时树脂温度测量

CAE and Intelligent Processing of Polymeric Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0630

A. J. Bur, K. Migler, Mark G. Vangel, D. Johnsonbaugh

{"title":"Real-Time Resin Temperature Measurements for Polymer Processing Using Fluorescence Spectroscopy","authors":"A. J. Bur, K. Migler, Mark G. Vangel, D. Johnsonbaugh","doi":"10.1115/imece1997-0630","DOIUrl":"https://doi.org/10.1115/imece1997-0630","url":null,"abstract":"\u0000 We have developed a measurement methodology for measuring resin temperature and temperature profiles during processing using fluorescence spectroscopy. The technique consists of mixing a temperature sensitive fluorescent dye with a polymer resin at very low concentration, on the order of 10−6 molar concentration, and monitoring the temperature dependence of the fluorescence spectra. Two classes of fluorescent dyes are used: (a) excimer producing dyes such as bis-(pyrene) propane, and (b) band broadening dyes such as perylene and benzoxazolyl stilbene. Because the fluorescence measurement reflects the temperature in the neighborhood of the dye molecule, true resin temperature is observed and effects due the large thermal mass of the processing machine are minimized. Real-time monitoring was achieved using optical fiber sensors which were inserted into the process line at existing instrumentation ports. We monitored both injection molding and extrusion observing effects due to shear heating, crystallization and thermal diffusion. Temperature profiles in a flowing resin were measured using a sensor with confocal focusing optics. With this sensor, excitation light is focused to a point in the resin and the temperature at that point is deduced from the resultant fluorescence. In most cases, the fluorescence data must be corrected for effects due to pressure in order to yield an accurate temperature measurement.","PeriodicalId":220828,"journal":{"name":"CAE and Intelligent Processing of Polymeric Materials","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122268182","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

Characterizing the Microstructure of Fused Deposition Polymer Components 熔融沉积聚合物构件的微观结构表征

CAE and Intelligent Processing of Polymeric Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0636

J. Rodríguez, James P. Thomas, J. Renaud

{"title":"Characterizing the Microstructure of Fused Deposition Polymer Components","authors":"J. Rodríguez, James P. Thomas, J. Renaud","doi":"10.1115/imece1997-0636","DOIUrl":"https://doi.org/10.1115/imece1997-0636","url":null,"abstract":"\u0000 The speed and accuracy with which Fused Deposition (FD) ABS plastic components can be made gives this rapid-prototyping technology unique potential as a new method for manufacturing complex structural components. Quantitative relationships between the FD process variables and the resulting mechanical properties are needed for intelligent manufacture of polymer components with tailored strength properties. This work examined the influence of the process variables on the resulting microstructure (void and interface bond length densities) of two configurations with uniaxial fiber orientation. The results showed the void and interface densities to be strongly dependent on the fiber-to-fiber gap and extrusion flow rate settings; the influence of extrusion and envelope temperatures is much smaller. The skewed fiber configuration exhibited the lowest void density but also the lowest interface density values. However, the difference observed in the values for the interface density were not as big as for the case of the void density. An investigation of the influence of the process variables on the interface bond strengths and the tensile behavior of pre- and post-extruded fibers as a function of loading rate and test temperature is in progress.","PeriodicalId":220828,"journal":{"name":"CAE and Intelligent Processing of Polymeric Materials","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116142223","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

Synthesis and Analysis of Quality Control Methods for Intelligent Processing of Polymeric Materials 高分子材料智能加工质量控制方法的合成与分析

CAE and Intelligent Processing of Polymeric Materials Pub Date : 1997-11-16 DOI: 10.1115/imece1997-0633

D. Kazmer, T. Petrova

{"title":"Synthesis and Analysis of Quality Control Methods for Intelligent Processing of Polymeric Materials","authors":"D. Kazmer, T. Petrova","doi":"10.1115/imece1997-0633","DOIUrl":"https://doi.org/10.1115/imece1997-0633","url":null,"abstract":"\u0000 Global manufacturers of thermoplastic molded parts increasingly require 100% quality inspection levels that are difficult to achieve. While process complexity makes it difficult to attain the desired part properties during start-up. the stochastic nature of the process causes difficulty in maintaining part quality during production. This paper formally compares several alternative quality control methods that are currently utilized for processing of polymeric materials. To identify the technical issues associated with this goal, the injection molding process is described utilizing a control systems approach. Afterwards, four different methods of quality regulation are synthesized for injection molding: open loop quality control, statistical process control, trained parameter control, and on-line quality regression. For each strategy, the level of quality observability and controllability are determined against the dynamics of the manufacturing system.\u0000 The results indicate that none of the quality regulation strategies have the underlying design architecture to deliver 100% quality assurance across a diverse set of application characteristics (quality requirements, material properties, mold geometries, and machine dynamics). As such, subsequent discussion focuses on defining the system requirements for achieving ‘intelligent’ processing of polymeric materials that are needed by industry.","PeriodicalId":220828,"journal":{"name":"CAE and Intelligent Processing of Polymeric Materials","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125015463","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