Deep-Drawing Forming Trials on a Cross-Ply Thermoplastic Lamina for Helmet Preform Manufacture

2016 ◽  
Vol 139 (3) ◽  
Author(s):  
Lisa M. Dangora ◽  
Cynthia J. Mitchell ◽  
James Sherwood ◽  
Jason C. Parker
Keyword(s):  
Deep Drawing ◽  
Material Selection ◽  
Processing Parameters ◽  
Processing Technique ◽  
Ballistic Performance ◽  
Deep Draw ◽  
Near Net Shape ◽  
Formed Part ◽  
Modern Warfare

With the evolution of modern warfare, there is a constant demand for enhanced soldier protection. The research efforts presented in this paper focus on improving the ballistic performance of composite combat helmets through the control of fiber orientations, reduction of seam density, and preservation of long fiber lengths. To accomplish these objectives, near-net-shape preforming is explored as an alternative method to the traditional cut and dart techniques used in the manufacture of combat helmets. An overview of current fabrication procedures is provided in addition to a discussion of the material selection and preform processing technique. Forming trials are conducted on Dyneema® HB80, a cross-ply thermoplastic lamina, using a laboratory deep-draw setup to explore the effects of processing parameters on the quality of the formed part. Undesirable wrinkling that manifests during deep-drawing of the material is found to be most effectively mitigated through the use of sufficient binder pressure. Furthermore, it is demonstrated that a loose ply stack up is more amenable to the production of high-quality preforms than a preconsolidated charge of material.

scholarly journals ANALISIS SQUARE CUP DEEP DRAWING

2007 ◽  
Vol 6 (1) ◽  
Author(s):  
Uud Achmad Imadudin ◽  
Marwan Effendy
Keyword(s):  
Numerical Simulation ◽  
Sheet Metal Forming ◽  
Deep Drawing ◽  
Metal Forming ◽  
Finite Element Code ◽  
Benchmark Problem ◽  
Simulation And Optimization ◽  
Formed Part

The applications of sheet metal forming is very important in the automotiveindustries since most of the car components are produced by press formingprocesses. Survey shows that the role of numerical simulation and optimization toimprove performance and quality of their products are still very limited. Thispaper describes the use of MARC finite element code in a single stage sheet metalforming simulation on square cup deep drawing. The MARC’s results arevalidated with experimental results of benchmark problem square cup deepdrawing in Numisheet ’93. The paper also discusses the localized stress andstrain values of the formed part

A Numerical Study of Micro Hydro Deep Drawing of SUS304 Sheets

2016 ◽  
Vol 846 ◽  
pp. 524-529 ◽  
Author(s):  
Liang Luo ◽  
Zheng Yi Jiang ◽  
Dong Bin Wei ◽  
Hideki Sato ◽  
Tsuyoshi Furushima ◽  
...  
Keyword(s):  
Deep Drawing ◽  
Numerical Study ◽  
Processing Parameters ◽  
Hydraulic Pressure ◽  
Micro Forming ◽  
Shape Accuracy ◽  
Micro Electro Mechanical Systems ◽  
Material Inhomogeneity ◽  
Novel Technology

Micro forming is a promising technology and has drawn global attentions due to the urgent requirements on miniaturised products. Micro hydro deep drawing (MHDD) is a typical micro forming method and its products are widely applied in various fields, such as micro electro-mechanical systems (MEMS), medical and aerospace areas. However, tiny sizes of both products and tools are obstacles to investigate this novel technology. Therefore, finite element method (FEM) is adopted and modified to study the influence of processing parameters on micro drawing process and produced products. In this study, a normal hydro deep drawing model was developed, and then a voronoi blank model was generated to consider the size effects of materials. Additionally, a surface layer model was created based on the voronoi blank model. Therefore, the open and closed lubricant theory can be fulfilled and friction behaviour in MHDD can be considered. Subsequently, different processing parameters, such as hydraulic pressure and material inhomogeneity, were investigated. Simulation results indicate that a proper hydraulic pressure improves drawability and shape accuracy of the drawn cups. Moreover, material inhomogeneity affects the quality of drawn cups.

scholarly journals Material Selection for a Fuel Tank and its FE Simulation in deep drawing

2018 ◽  
Vol 3 (1) ◽  
pp. 01-04
Author(s):  
Vijay Gautam ◽  
◽  
Subhajit Konar
Keyword(s):  
Tensile Properties ◽  
Deep Drawing ◽  
Fe Simulation ◽  
Material Selection ◽  
Sheet Material ◽  
Rolling Direction ◽  
Fuel Tank ◽  
Interstitial Free ◽  
Deep Draw ◽  
Interstitial Free Steel

Deep drawing is a sheet metal forming process in which deformation forces are oriented in the plane of the sheet, and the surface pressures in the tool are generally lower than the yield stress of the sheet material. The present work discusses the selection of sheet material suitable for a fuel tank by experimental evaluation of tensile properties of interstitial free steel and deep draw quality steel sheets of the same thickness of 0.8mm. The tensile specimens are laser cut from a blank with a known rolling direction and are tested for tensile properties and anisotropy. These tensile properties of the sheets are used in the material model in FE simulation of the deep draw process using HyperWorks. It is observed that an optimum blank holder force is necessary to remove the wrinkling defects. It is concluded that higher ductility and normal anisotropy are the key factors for higher thinning resistance in deep drawing and hence, interstitial free steel sheet qualifies as the better material for the fuel tank.

scholarly journals Effect of Tool Geometry Parameters on the Formability of a Camera Cover in the Deep Drawing Process

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3993
Author(s):  
Thanh Trung Do ◽  
Pham Son Minh ◽  
Nhan Le
Keyword(s):  
Deep Drawing ◽  
Thickness Distribution ◽  
Metal Flow ◽  
Sheet Thickness ◽  
Side Wall ◽  
Tool Geometry ◽  
Drawing Process ◽  
Nose Radius ◽  
Deep Drawing Process

The formability of the drawn part in the deep drawing process depends not only on the material properties, but also on the equipment used, metal flow control and tool parameters. The most common defects can be the thickening, stretching and splitting. However, the optimization of tools including the die and punch parameters leads to a reduction of the defects and improves the quality of the products. In this paper, the formability of the camera cover by aluminum alloy A1050 in the deep drawing process was examined relating to the tool geometry parameters based on numerical and experimental analyses. The results showed that the thickness was the smallest and the stress was the highest at one of the bottom corners where the biaxial stretching was the predominant mode of deformation. The problems of the thickening at the flange area, the stretching at the side wall and the splitting at the bottom corners could be prevented when the tool parameters were optimized that related to the thickness and stress. It was clear that the optimal thickness distribution of the camera cover was obtained by the design of tools with the best values—with the die edge radius 10 times, the pocket radius on the bottom of the die 5 times, and the punch nose radius 2.5 times the sheet thickness. Additionally, the quality of the camera cover was improved with a maximum thinning of 25% experimentally, and it was within the suggested maximum allowable thickness reduction of 45% for various industrial applications after optimizing the tool geometry parameters in the deep drawing process.

scholarly journals Experimental Investigation on Micro Deep Drawing of Stainless Steel Foils with Different Microstructural Characteristics

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Jingwei Zhao ◽  
Tao Wang ◽  
Fanghui Jia ◽  
Zhou Li ◽  
Cunlong Zhou ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Deep Drawing ◽  
Annealing Temperature ◽  
Localized Deformation ◽  
Microstructural Characteristics ◽  
Height Profile ◽  
Annealing Temperatures ◽  
Micro Deep Drawing ◽  
Profile Distribution

AbstractIn the present work, austenitic stainless steel (ASS) 304 foils with a thickness of 50 µm were first annealed at temperatures ranging from 700 to 1100 ℃ for 1 h to obtain different microstructural characteristics. Then the effects of microstructural characteristics on the formability of ASS 304 foils and the quality of drawn cups using micro deep drawing (MDD) were studied, and the mechanism involved was discussed. The results show that the as-received ASS 304 foil has a poor formability and cannot be used to form a cup using MDD. Serious wrinkling problem occurs on the drawn cup, and the height profile distribution on the mouth and the symmetry of the drawn cup is quite non-uniform when the annealing temperature is 700 ℃. At annealing temperatures of 900 and 950 ℃, the drawn cups are both characterized with very few wrinkles, and the distribution of height profile, symmetry and mouth thickness are uniform on the mouths of the drawn cups. The wrinkling becomes increasingly significant with a further increase of annealing temperature from 950 to 1100 ℃. The optimal annealing temperatures obtained in this study are 900 and 950 ℃ for reducing the generation of wrinkling, and therefore improving the quality of drawn cups. With non-optimized microstructure, the distribution of the compressive stress in the circumferential direction of the drawn foils becomes inhomogeneous, which is thought to be the cause of the occurrence of localized deformation till wrinkling during MDD.

scholarly journals Optimisation of Shrinkage and Strength on Thick Plate Part Using Recycled LDPE Materials

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1795
Author(s):  
Norshahira Roslan ◽  
Shayfull Zamree Abd Rahim ◽  
Abdellah El-hadj Abdellah ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Katarzyna Błoch ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Thick Plate ◽  
Processing Parameters ◽  
Processing Parameter ◽  
Plastic Injection Moulding ◽  
Optimal Setting ◽  
Quality Of Products ◽  
Validation Tests ◽  
Plastic Injection

Achieving good quality of products from plastic injection moulding processes is very challenging, since the process comprises many affecting parameters. Common defects such as warpage are hard to avoid, and the defective parts will eventually go to waste, leading to unnecessary costs to the manufacturer. The use of recycled material from postindustrial waste has been studied by a few researchers. However, the application of an optimisation method by which to optimise processing parameters to mould parts using recycled materials remains lacking. In this study, Response Surface Methodology (RSM) and Particle Swarm Optimisation (PSO) methods were conducted on thick plate parts moulded using virgin and recycled low-density polyethylene (LDPE) materials (100:0, 70:30, 60:40 and 50:50; virgin to recycle material ratios) to find the optimal input parameters for each of the material ratios. Shrinkage in the x and y directions increased in correlation with the recycled ratio, compared to virgin material. Meanwhile, the tensile strength of the thick plate part continued to decrease when the recycled ratio increased. R30 (70:30) had the optimum shrinkage in the x direction with respect to R0 (100:0) material where the shrinkage increased by 24.49% (RSM) and 33.20% (PSO). On the other hand, the shrinkage in the y direction for R30 material increased by 4.48% (RSM) and decreased by 2.67% (PSO), while the tensile strength of R30 (70:30) material decreased by 0.51% (RSM) and 2.68% (PSO) as compared to R0 (100:0) material. Validation tests indicated that the optimal setting of processing parameter suggested by PSO and RSM for R0 (100:0), R30 (70:30), R40 (60:40) and R50 (50:50) was less than 10%.

Observation in the Surface Roughness of Silicon Wafer during Semi-Fixed Abrasive Machining with Large Grains

2009 ◽  
Vol 69-70 ◽  
pp. 253-257
Author(s):  
Ping Zhao ◽  
Jia Jie Chen ◽  
Fan Yang ◽  
K.F. Tang ◽  
Ju Long Yuan ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Silicon Wafer ◽  
Processing Parameters ◽  
Wafer Surface ◽  
Abrasive Machining ◽  
Fixed Abrasive ◽  
Is Failure ◽  
Better Than

Semi-fixed abrasive is a novel abrasive. It has a ‘trap’ effect on the hard large grains that can prevent defect effectively on the surface of the workpiece which is caused by large grains. In this paper, some relevant experiments towards silicon wafers are carried out under the different processing parameters on the semi-fixed abrasive plates, and 180# SiC is used as large grains. The processed workpieces’ surface roughness Rv are measured. The experimental results show that the surface quality of wafer will be worse because of higher load and faster rotating velocity. And it can make a conclusion that the higher proportion of bond of the plate, the weaker of the ‘trap’ effect it has. Furthermore the wet environment is better than dry for the wafer surface in machining. The practice shows that the ‘trap’ effect is failure when the workpiece is machined by abrasive plate which is 4.5wt% proportion of bond in dry lapping.

Processing technique affects shelf life and sensorial quality of fish pickle

2021 ◽  
Vol 9 (2) ◽  
pp. 163-170
Author(s):  
Y Prabhabati Devi ◽  
R K Lembisana ◽  
Y Jamuna Devi
Keyword(s):  
Shelf Life ◽  
Processing Technique ◽  
Sensorial Quality

scholarly journals PENGARUH KUALITAS PELAYANAN PERIZINAN TERHADAP KEPUASAN MASYARAKAT PADA DINAS PENANAMAN MODAL DAN PELAYANAN TERPADU SATU PINTU (DPMPTSP)

Epigram ◽  
2019 ◽  
Vol 15 (2) ◽  
Author(s):  
Ratna Yulianingsih ◽  
Tuti Hartati ◽  
Tuti Hartati ◽  
Mawarta Onida ◽  
Mawarta Onida
Keyword(s):  
Service Quality ◽  
Correlation Coefficient ◽  
Quantitative Research ◽  
Linear Regression Analysis ◽  
Test Validity ◽  
Processing Technique ◽  
Coefficient Of Determination ◽  
Simple Correlation ◽  
One Stop

AbstractThis study aims to determine the effect of licensing service quality on community satisfaction in the Bogor Regency DPMPTSP. This research uses quantitative research method. Data collection in Bogor Regency uses observation and questionnaire. Data processing technique using Likert scale, while the technique of data analysis using test Validity, Reliability, Normality, Linearity, simple linear regression analysis, simple correlation analysis, coefficient of determination and test of correlation coefficient significance or T test. The results are: (a) The results of simple correlation coefficient test between the quality of service quality (X) and the satisfaction of society (Y) is 0.756 is strong, if it is concluded that there is strong correlation between variable (X) and variable (Y). (b) variable of service quality (X) give influence to variable satisfaction (Y) equal to 57,1% while the rest that is equal to 42,9% influenced by other factor not examined. (c) the result of t arithmetic is 10,633, while t table is 1,663 so that 10,633 > 1,663 so that service quality of permit in DPMPTSP Bogor Regency has significant influence to the satisfaction of society.Keyword: Service Quality, Public Service, Investment Service and One Stop Service.AbstrakPenelitian ini bertujuan untuk mengetahui pengaruh kualitas pelayanan perizinan terhadap kepuasan masyarakat pada DPMPTSP Kabupaten Bogor. Penelitian ini menggunakan metode penelitian kuantitatif. Pengumpulan data pada DPMPTSP Kabupaten Bogor menggunakan teknik observasi, dan kuesioner. Teknik pengolahan data menggunakan skala likert, sedangkan teknik analisis data menggunakan uji validitas, reliabilitas, normalitas, liniearitas, analisis regresi liniear sederhana, analisis korelasi sederhana, koefisien determinasi dan uji signifikansi koefisien korelasi atau uji T. Hasil penelitian menunjukkan bahwa : (a) Berdasarkan hasil uji koefisien korelasi sederhana antara variabel kualiatas pelayanan (X) dan kepuasan masyarakt (Y) bernilai 0,756 artinya kuat, jika disimpulkan bahwa terjadi hubungan yang kuat antara variabel (X) dengan variabel (Y). (b) variabel kualitas pelayanan (X) memberikan pengaruh terhadap variabel kepuasan (Y) sebesar 57,1% sedangakan sisanya yaitu sebesar 42,9% dipengaruhi oleh faktor lain yang tidak diteliti. (c) hasil t hitung yang didapatkan adalah 10,633, sedangkan t tabel adalah 1,663 sehingga 10,633 >1,663 sehingga kualitas pelayanan perizinan di DPMPTSP Kabupaten Bogor mempunyai pengaruh yang signifikan terhadap kepuasan masyarakat.Kata Kunci: Kualitas Pelayanan, Pelayanan Publik, Dinas Penanaman Modal dan Pelayanan Terpadu Satu Pintu (DPMPTSP)

scholarly journals THE EFFECT OF ABRASIVE GRAIN SHAPES ON QUALITY OF FERRITE MAGNETS GRINDING PROCESS

2020 ◽  
Vol 14 (2) ◽  
pp. 117-124
Author(s):  
Bayu Rahmat Saputro ◽  
Amin Suhadi
Keyword(s):  
Chemical Composition ◽  
Single Layer ◽  
Processing Parameters ◽  
Grinding Process ◽  
Model Design ◽  
Grinding Wheels ◽  
Abrasive Grains ◽  
Abrasive Grain ◽  
Shape And Size

Abstract A research was conducted on the grinding process of ferrite magnet with Strontium ferrite type (SrO.6 (Fe2O3)) using electroplated single layer grinding wheels. Many cracks have been found on work pieces during this work, which is coming from grinding processes. Research is conducted starting from chemical composition test and the effect of the shape and size of the abrasive grain of grinding wheels to the quality of grinding process results by measuring crack ratio of the work piece.  In this experiment, 3 (three) model design of grinding wheels with three different size and shape of abrasive grains are made. All of processing parameters are set at the same value as ordinary process.  The experimental results shown that 3rd model have the best results from the outputs number and also the lowest reject crack ratio compared to 1st and 2nd models. This is because the 3rd model has blocky shape which its distribution structure is denser and more uniform compared to the irregular shape, so that continuous grinding on hard and brittle work pieces is more stable and suitable

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