Effects of fabric structure on the formability characteristics of thermoplastic composites under various process conditions

2018 ◽  
Vol 42 (3) ◽  
pp. 298-308
Author(s):  
Sugumar Suresh ◽  
Velukkudi Santhanam Senthil Kumar
Keyword(s):  
Glass Fabric ◽  
Thermoplastic Composites ◽  
Process Conditions ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Reinforced Composite ◽  
Fabric Structure ◽  
Forming Characteristics ◽  
Stamp Forming ◽  
Die Temperature

Thermoplastic composites are broadly utilized for structural and automotive applications due to their higher specific strength and modulus, higher strain to failure, recyclability, and unlimited shelf life. This study investigates the effects of fabric structure on the forming behaviour of glass fabric reinforced polypropylene composites during the sheet forming of a doubly curved shape. Stamp forming, a novel thermoforming technique, is mostly used for hemispherical forming of thermoplastic composites. The study also investigates the influence of process parameters such as die temperature, blank temperature, and blank holder force on sheet formability. Forming ratio, thickness distribution, material draw-in, and punch force were used for the evaluation of the formability of composites. Conventional and novel plain weave glass fabric reinforced polypropylene composite laminates were fabricated using the film stacking technique. Thermo-stamp forming experiments were conducted on the basis of the Taguchi’s L9 orthogonal array. Experimental results revealed better forming characteristics by the novel glass fabric reinforced composite than for the conventional glass fabric reinforced composite. Production of defect-free components under high die temperature, low blank holder force, and medium blank temperature process condition was observed.

The effect of blank holder force on the stamp forming behavior of non-crimp fabric with a chain stitch

2007 ◽  
Vol 67 (3-4) ◽  
pp. 357-366 ◽  
Author(s):  
Ji Seok Lee ◽  
Seok Jin Hong ◽  
Woong-Ryeol Yu ◽  
Tae Jin Kang
Keyword(s):  
Blank Holder Force ◽  
Blank Holder ◽  
Stamp Forming ◽  
A Chain

Deep Drawing of Square-Shaped Sheet Metal Parts, Part 2: Experimental Study

1993 ◽  
Vol 115 (1) ◽  
pp. 110-117 ◽  
Author(s):  
S. A. Majlessi ◽  
D. Lee
Keyword(s):  
Process Parameters ◽  
Deep Drawing ◽  
Process Conditions ◽  
Drawing Process ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Punch Load ◽  
Blank Size

The deep drawing process of square and rectangular shells were investigated under different process conditions, and using two different drawing quality steels. The main objective was to identify the significance of some of the process parameters on the outcome of the drawing operation. The process parameters examined were shape and size of blank, the blank-holder force and frictional condition between blank and tooling. The results of this investigation were presented in terms of punch load, through thickness and in-plane strain distributions, formations of flange wrinkles and fracture, and the largest possible blank size that can be drawn successfully. Some of these experimental results were used to verify the validity of a simplified analytical model which was described in the first part of this paper.

Numerical Simulation of Ti-6Ai-4V Channel Part in Hot Forming Process

2011 ◽  
Vol 337 ◽  
pp. 410-413
Author(s):  
Jian Li ◽  
Jun Zhang ◽  
Xue Liang Deng
Keyword(s):  
Effective Stress ◽  
Hot Forming ◽  
Blank Holder Force ◽  
Force Curve ◽  
Technological Parameters ◽  
Forming Process ◽  
Growth Trend ◽  
Element Analysis ◽  
Blank Holder ◽  
Forming Characteristics

Abstract. Base on establishing the model of channel part deep drawing , the eat / DYNAFORM finite element analysis software is used to simulate and analysis the hot forming process of Ti-6Ai-4V channel part, the technological parameters which influenced the basic forming characteristics of the channel are researched. The result shows that: as with the punch and die clearance increases, the growth trend of the maximum effective stress value decreases, the thinning ratio has an increasing trend, the effect of clearance value on the material thickening ratio is small; as the fraction coefficient increases, the maximum effective stress increases in the whole forming stage, and along with the forming depths increase, friction can only influence the thinning ratio of material to a certain extent, the maximum thickening ratio decreases as the friction coefficient increases and decreases more quickly with the forming depths increase; the effect of different blank holder force on the maximum effective stress is not obvious in the forming process, under the role of first decrease and then increase type blank holder force curve, the maximum thinning ratio increases rapidly, exert the type of decreasing and the first increase then decrease blank holder force curve, the thickening ratio of the slab is small after forming, it can inhibit wrinkle and obtain better forming quality.

Anisotropy and Forming Characteristics of Magnesium Alloy ZE10

2012 ◽  
Vol 488-489 ◽  
pp. 295-299 ◽  
Author(s):  
M. Waseem Soomro ◽  
R. Khan ◽  
M. Akhtar
Keyword(s):  
Thin Sheet ◽  
Small Variation ◽  
Tensile Tests ◽  
Drawing Ratio ◽  
Strain Rates ◽  
Blank Holder Force ◽  
Punch Force ◽  
Blank Holder ◽  
Forming Characteristics ◽  
Effects Of Temperature

The current work investigates anisotropy and forming characteristics of ZE10 Mg alloy. Anisotropic effects are measured by analysing tensile tests data for the specimens from 0o, 45o and 90o rolling directions of thin sheet of 0.8 mm thickness. The effects of temperature and strain rates are also included in anisotropic analyses. The mechanical properties of ZE10 alloy are affected by the physical conditions like temperature and strain rates. The effect is significant on yield strength, UTS and fracture strain while small variation is observed in case of Young’s modulus. Deep drawing experiments have been done to investigate the effects of temperature on forming characteristics and limit drawing ratio (LDR) of an alloy. Forming investigation shows that it is difficult to produce a good or unfractured part at 100 oC, but it can be produce at 150 oC or higher with different combinations of blank holder force and drawing ratio. Also, LDR and blank holder force also effects required punch force.

Stamp Forming: A Comparison in the Use of Draw Beads and Blank Holder Force for Producing Aluminum Panels

2020 ◽  
Author(s):  
William J. Emblom
Keyword(s):  
Automotive Sector ◽  
Blank Holder Force ◽  
Forming Process ◽  
Blank Holder ◽  
Stamp Forming ◽  
Aluminum Panels ◽  
Bead Height

Abstract An investigation was performed examining the effects of draw beads and blank holder forces on local forces in various regions of a stamp forming process that produced oval aluminum panels. The results showed that provided there was sufficient blank holder forces to prevent wrinkling, the regions with draw beads were affected more by draw bead height than by blank holder force. However, at the die ends, away from the draw beads, blank holder force had more of an effect than the draw beads did with respect to local forces. Additionally, the draw bead height effects at the die end were not directly related but had to be interpreted based upon the effect on strains within the flange region at the die ends. This study may be especially useful for researchers in the automotive sector who are particularly interested in aluminum panel forming.

Determination of Proper Loading Profiles for Hydro-Mechanical Deep Drawing Process Using FEA

2014 ◽  
Vol 686 ◽  
pp. 540-548
Author(s):  
S.B. Akay ◽  
E.F. Şükür ◽  
M. Turkoz ◽  
S. Halkaci ◽  
M. Koç ◽  
...  
Keyword(s):  
Deep Drawing ◽  
Manufacturing Process ◽  
Sheet Material ◽  
Fluid Pressure ◽  
Process Conditions ◽  
Hydraulic Pressure ◽  
Drawing Ratio ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Force Profiles

Hydro-mechanical Deep Drawing (HMD) is an advanced manufacturing process developed to form sheet metal blanks into complex shapes with smooth surfaces using hydraulic pressure as an additional source of deformation force. There are many factors affecting the successful production of desired parts using this manufacturing process. The most important factors are the fluid pressure and blank holder force. Having proper values of these parameters during forming has a direct impact on part properties such as drawing ratio and thinning. In order to determine desired the fluid pressure and blank holder force profiles, which are different for every geometry, material and other process conditions, finite element simulations are conducted to save time and cost. Abaqus FEA software is used in this study. In order to define the continuously changing fluid pressure application area on the sheet material, which is not an available module or standard interface of software, sub-programs (sub-routines) are developed to properly and dynamically define the fluid pressure area. Proper, if not optimal, fluid pressure and blank holder force profiles, which allow the formability (LDR) of sheet material to be maximum, were obtained using trial and error method. Maximum thinning values on metal blank were used as a control parameter to determine if selected loading profiles result in the highest LDR with lowest thinning.

Synthetic glass and jute fabric reinforced soy-based biocomposites: Development and characterization

2021 ◽  
pp. 096739112110206
Author(s):  
Ajaya Kumar Behera ◽  
Chirasmayee Mohanty ◽  
Nigamananda Das
Keyword(s):  
Hybrid Composites ◽  
Hydrolytic Stability ◽  
Glass Fabric ◽  
Soil Burial ◽  
Jute Fabric ◽  
Reinforced Composite ◽  
Original Weight ◽  
Fabric Composites ◽  
Biodegradation Study ◽  
Burial Condition

In this work, both glass fabric and jute fabric reinforced nanoclay modified soy matrix-based composites were developed and characterized. Glass fabric (60 wt.%) reinforced composite showed maximum tensile strength of 70.2 MPa and thermal stability up to 202°C, which are 82.8% and 12.2% higher than those observed with corresponding jute composite. Water absorption and contact angle values of glass-soy specimens were tested, and found composites are water stable. Biodegradation study of composites under soil burial condition revealed that glass-soy composite with 40 wt.% glass fabric lost maximum 32.6% of its original weight after 60 days of degradation. The developed glass fabric-soy hybrid composites with reasonable mechanical, thermal, and hydrolytic stability can be used in different sectors as an alternative to the nondegradable thermoplastic reinforced glass fabric composites.

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