scholarly journals A Simulator to Optimize the Experimental Set-Up for Elasto-Plastic Material Characterization

2016 ◽  
pp. 97-103
Author(s):  
Michele Badaloni ◽  
Attilio Lattanzi ◽  
Marco Rossi ◽  
Pascal Lava ◽  
Dimitri Debruyne
Keyword(s):  
Material Characterization ◽  
Plastic Material ◽  
Set Up

scholarly journals FORMULATING GUIDELINES FOR THE SYSTEMATIC SET-UP OF EXPERIENTIAL MATERIAL CHARACTERIZATION STUDIES: A CASE OF PLASTIC DEMONSTRATORS

2021 ◽  
Vol 1 ◽  
pp. 1587-1596
Author(s):  
Lore Veelaert ◽  
Ingrid Moons ◽  
Els Du Bois
Keyword(s):  
Design Process ◽  
Material Characterization ◽  
Plastic Material ◽  
Reasoning Process ◽  
Material Data ◽  
Dependent Variables ◽  
Characterization Studies ◽  
Set Up ◽  
Level Building

AbstractMaterials can be considered from a technical and experiential perspective. However, the latter perspective is more complex to study systematically. Four intertwined experiential levels describe the overall materials experience: sensorial, interpretive, affective, and performative level. Building upon the need in experiential material characterization for comparable physical material representations to enable within-material-class comparisons and the inclusion of extensive user aspects, this paper sums up the reasoning process regarding the understanding and design of an experimental set-up and its parameters of a specific case. The case objective is to formulate guidelines for the designer/researcher to set up experiential material characterization experiments with (i) plastic demonstrator forms and (ii) by consumers. Following elements are discussed: Assessors, Stimuli, Interaction Modalities, Dependent variables, Method, and Practical considerations. Next, future experiments can be carried out in order to generate holistic plastic material data on a larger scale, that can be collected in an experiential database and used by designers throughout the design process.

scholarly journals White-light speckle image correlation applied to large-strain material characterization

2009 ◽  
pp. 377-392
Author(s):  
Giovanni B. Broggiato ◽  
Luca Cortese
Keyword(s):  
Material Characterization ◽  
Plastic Material ◽  
Large Strain ◽  
Equivalent Stress ◽  
Tensile Tests ◽  
Equivalent Strain ◽  
Image Correlation ◽  
Plastic Behavior ◽  
Full Field ◽  
Measurement Devices

In experimental mechanics, the possibility of tracking on component surfaces the full-field stress and strain states during deformation can be utilized for many purposes such as formability limits determination, quantification of stress intensification factors, material characterization and so on. Concerning the last topic, an interesting application could be a direct identification of the elasto-plastic material response up to large deformation. It is well known, in fact, that with traditional measurement devices it is possible to retrieve the true equivalent stress versus true equivalent strain data from tensile tests only up to the onset of necking, where localization starts to occur. This work aims to show how from the knowledge of a tensile test full-field strain and of load data it will be possible to obtain the full-stress field as well as the complete material elasto-plastic behavior.

Design of an AC Conductivity Measurement Setup for Sensor Materials Characterization

2014 ◽  
Vol 4 (2) ◽  
pp. 1-7
Author(s):  
Nisha Rajappan ◽  
K.N. Madhusoodanan
Keyword(s):  
Material Characterization ◽  
Ac Conductivity ◽  
Gas Sensing ◽  
Conductivity Measurement ◽  
Sensor Material ◽  
Semiconductor Gas Sensor ◽  
Sensor Materials ◽  
Set Up ◽  
Sensing Characteristics ◽  
Conductivity Cell

AC conductivity measurement can be an effective method for the study of sensor material characteristics for gas sensing. The authors have designed and fabricated a sensitive set up for sensor material characterization using ac conductivity measurement. The set up fabricated is employed for bulk samples. AC conductivity cell with cold fingertip that can facilitate measurement in the range 80 K to 500 K has been fabricated. The necessary vacuum lines and gas feed throughs are provided in order to study the gas sensing characteristics of semiconductor gas sensor materials. A programmable PID temperature controller and the necessary signal conditioning circuits are designed and incorporated into the system. AC conductivity measurement is carried out using Fluke PM 6306 impedance analyzer.

Study on Impinging Stream Flow Channel in Abrasive Flow Polishing Complex Cavity of Precision Mold

2013 ◽  
Vol 797 ◽  
pp. 469-474
Author(s):  
Di Feng Zhou ◽  
Dong Yu Liu
Keyword(s):  
Stream Flow ◽  
Plastic Material ◽  
Material Model ◽  
Impact Deformation ◽  
Element Simulation ◽  
Complex Cavity ◽  
Elastic Plastic Material ◽  
Set Up ◽  
The Impact ◽  
Abrasive Flow Polishing

In order to solve the problem about polishing complex cavity of precision mold, to improve the efficiency of processing and reduce the surface roughness, putting forward multiple entries impinging stream processing device.With making use of the collision of two strands of abrasive flow, Realizing the mutual disturbance of abrasive flow in the runner, and increasing the collision between abrasive to improve the disordering of abrasive movement, for promoting abrasive polishing to mold cavity. Johnson-Cook elastic-plastic material model is set up at the same time, using abaqus finite element simulation to simulate the impact deformation wear and cutting wear with the increasment of impact times.

scholarly journals THE “<i>GABINETTO</i> OF GILDED STUCCO” IN THE ROYAL PALACE OF PORTICI, NAPLES (ITALY): SURVEY AND DIAGNOSIS FOR CONSERVATION

2020 ◽  
Vol XLIV-M-1-2020 ◽  
pp. 427-434
Author(s):  
D. Treccozzi ◽  
A. Pane ◽  
A. Sansonetti ◽  
R. Catuogno
Keyword(s):  
Material Characterization ◽  
18Th Century ◽  
Academic Department ◽  
Existing Building ◽  
Royal Palace ◽  
Original Technique ◽  
Archival Documents ◽  
Set Up

Abstract. During the 18th century architecture in Naples reached an extremely balanced synthesis between architectural spatiality and decorative apparatuses representing the most successful example of local inventiveness over history. Quite an impressive case dating back to that period is represented by the “Gabinetto of gilded stucco” in the Royal Palace in Portici. Located in the area of the palace known as Caramanico – from the name of the owner of the pre-existing building incorporated in the palace – the stucco was molded between 1752 and 1753 by the two stucco workers Angelo la Sala and Gennaro Bruscino, who also decorated the “Salotto di Porcellana” in Chinese style. Today the room, used as an academic department, is affected by quite a serious stucco decay majorly due to negligence and humidity and consisting in efflorescence, powdering and bursting, worsened by the corrosion of metal fixings. However, the present-day state of conservation of these stuccoworks represents a unique opportunity to carefully observe the original technique used to make such artworks at that time. Therefore by means of advanced surveying instruments and multi-analytical material characterization together with archival documents, the present research – set up in collaboration between University of Naples, Politecnico di Milano and CNR – aims at elaborating a thorough knowledge of an emblematic case of 18th century Neapolitan stucco with a view to its future conservation.

scholarly journals STUDY OF DEFECT ON LLDPE PLUG FOR TELON OIL PRODUCTS USING A HAITIAN MOLDING INJECTION MACHINE 1600MA AT PT X

2020 ◽  
Vol 8 (2) ◽  
pp. 65-74
Author(s):  
Mochammad Mahardika ◽  
Handika Rahmayanti ◽  
Abdul Majid
Keyword(s):  
Injection Molding ◽  
Production Process ◽  
Plastic Material ◽  
Black Dot ◽  
Molding Machine ◽  
Injection Molding Machine ◽  
Plastic Bottle ◽  
Short Shot ◽  
Set Up ◽  
Plastic Pellets

The type of plastic packaging that is popular among the public is bottle packaging, plastic bottle packaging always has a bottle cap. Some people only know that the part of the bottle cap is only on the outer cap, even though the plastic bottle cap consists of two types, namely the outer cap (cap) and the inner cap (plug). The plastic material used to make the plug is Linear Low Density Polyethylene (LLDPE), a telon oil plug is produced using an injection molding machine, by inserting plastic pellets into the hopper and then heating it by the barrel, plastic pellets that have melted will be injected into the mold ( print). In the process of making the telon oil plug, a defect was found. From the observation, it is known that several types of defects that occur during the LLDPE oil plug production process include black dot, flashing, and unmould / short shot. Defects that occur during the telon oil plug production process are caused by damage, contamination, and mismatches in the engine parameter settings. The purpose of this study is to determine the causes and solutions of defects that occur in LLDPE telon oil plugs with the HAITIAN 1600MA injection molding machine at PT X. Some solutions are made to reduce defects that occur in telon oil LLDPE plugs is to clean the material reservoir, repair or replace the mold, clean the hopper before loading the material, and set up the barrel parameter 180-230oC, inject pressure 60 bar, holding pressure 30 bar, speed 17.8 seconds.

scholarly journals Detection of Microplastic in Human Placenta and Meconium in a Clinical Setting

Pharmaceutics ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 921
Author(s):  
Thorsten Braun ◽  
Loreen Ehrlich ◽  
Wolfgang Henrich ◽  
Sebastian Koeppel ◽  
Ievgeniia Lomako ◽  
...  
Keyword(s):  
Human Placenta ◽  
Clinical Setting ◽  
Plastic Material ◽  
Critical Evaluation ◽  
Real Life ◽  
Placental Tissue ◽  
Cesarean Sections ◽  
Organ Tissue ◽  
Stool Samples ◽  
Set Up

Environmental pollution with microplastics (MPs) is a major and worldwide concern. Involuntary exposure to MPs by ingestion or inhalation is unavoidable. The effects on human health are still under debate, while in animals, cellular MP translocation and subsequent deleterious effects were shown. First reports indicate a potential intrauterine exposure with MPs, yet readouts are prone to contamination. Method: To establish a thorough protocol for the detection of MPs in human placenta and fetal meconium in a real-life clinical setting, a pilot study was set up to screen for MPs > 50 µm in placental tissue and meconium sampled during two cesarean sections for breech deliveries. After chemical digestion of non-plastic material, Fourier-transform infrared (FTIR) microspectroscopy was used to analyze the presence of 10 common types of microplastic in placenta and stool samples. Results: Human placenta and meconium samples were screened positive for polyethylene, polypropylene, polystyrene, and polyurethane, of which only the latter one was also detected as airborne fallout in the operating room—thus representing potential contamination. Conclusion: We found MPs > 50 µm in placenta and meconium acquired from cesarean delivery. Critical evaluation of potential contamination sources is pivotal and may guide future clinical studies to improve the correct detection of MPs in organ tissue. Studies investigating nano-sized plastics in human tissue are warranted.

scholarly journals Injection parameters study for a polypropylene probe used on tension test

2020 ◽  
pp. 1-6
Author(s):  
Jesus E. RODRÍGUEZ-DAHMLOW ◽  
Rosalba FUENTES-RAMIREZ ◽  
Fernando I. GÓMEZ-CASTRO ◽  
Luis E. MURILLO-YAÑEZ
Keyword(s):  
Cycle Time ◽  
Plastic Material ◽  
Injection Pressure ◽  
Injection Point ◽  
Tensile Test Specimen ◽  
Injection Parameters ◽  
Real Process ◽  
Starting Point ◽  
Element Type ◽  
Set Up

Simulation of the melten allows us to predict the behavior of the plastic material inside the mold, clarifying that at present polymers are one of the most used materials due to the versatility of its properties. Through the simulation using the Solidworks Plastic® platform, it is proved that injection time is defined by the thickness of the part and the injection point diameter. Besides, every simulation gives a relation between pressure, cooling, and cycle time, by making changes in mold and PP temperature is possible to get a starting point to set up the conditions of real process. Simulation also involves the selection of the element type and some other parameters related to the Finite Element Method. The relevance of the study focuses on giving a starting point for processing PP using the theory and the simulation due to most of the time injection conditions are selected by previous experience of the operator. Accordingly, this work focuses on the study for the required injection pressure, cooling, and injection cycle time to process a polypropylene (PP) tensile test specimen based on the Standard ISO D638D-14, these variables are tested changing the mold and PP temperature trying to predict the best injection parameters.

Analysis for inversion load and energy absorption of a circular tube

1983 ◽  
Vol 18 (3) ◽  
pp. 177-188 ◽  
Author(s):  
A N Kinkead
Keyword(s):  
Plastic Strain ◽  
Strain Hardening ◽  
Tube Wall ◽  
Plastic Material ◽  
Experimental Results ◽  
Inversion Process ◽  
Rigid Plastic ◽  
Engineering Strain ◽  
Thickness Change ◽  
Set Up

The basic theoretical approach in the mechanics of external or inside-to-outside inversion of circular tubes is examined and extended by the introduction of two additional and previously unperceived sub-structural mechanisms. It is shown that these refinements when applied to published results for ductile aluminium tubing inverted, in a non-frictional process, furnish very encouraging correlations. Since this analysis is made on an ‘engineering plastic strain’ basis a supplementary calculation is made employing ‘pure plastic strain’ or ‘natural strain’ in the predominant sub-structural processes. The resulting comparisons have shown that for rigid/plastic material characteristics the simplification derived in the use of engineering strain does not introduce serious errors in the evaluation of the inversion load. Here it might be mentioned that in many of the cited papers on external inversion, although the initial equations are set up in pure plastic strain terms, frequently the ensuing analysis is simplified by expressing the logarithmic strain as a series and eliminating all but the first term. This reverts the analysis to an engineering strain type. Hence the work described in this connection validates these previously adopted simplifications. In view of the satisfactory correlations achieved by introducing the above theoretical refinements for the external inversion process, the same procedure has also been applied to the case of internal or outside-to-inside tube inversion. Published analysis of the internal inversion process has previously neglected the pronounced thickening effect clearly demonstrated in all experimental results. (Tube-wall thickness change is not at all evident during external inversion and in fact this also assists in simplifying that analysis). In the present approach the effects of friction and work hardening in a compressive die process of internal inversion have been included in the manner already deduced in other research but in addition a further sub-structural process explaining and quantifying the associated thickening of the tube wall has been formulated. Here it should be mentioned that some uncertainty exists in relation to the application of strain hardening based on average plastic strains. However, since the four published experimental results available have been made with materials exhibiting strain hardening characteristics, the total newly developed and previously evolved analyses have been combined to enable some correlation to be made. The predicted internal inversion loads for two separate sets of results in three different materials are in very reasonable agreement with experimental values.

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