scholarly journals Improvement of Mechanical Properties and Forming Efficiency during Hot Gas Forming of CFRP Curved Surface Components

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5316
Author(s):  
Yizhe Chen ◽  
Yi Lin ◽  
Hui Wang ◽  
Zhiwen Liu ◽  
Lin Hua
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Gas Pressure ◽  
Curved Surface ◽  
Cover Plate ◽  
Forming Process ◽  
Hot Gas ◽  
New Energy ◽  
Forming Efficiency ◽  
Hot Gas Forming

Carbon fiber reinforced plastics (CFRP) are widely used in aerospace and new energy vehicles due to their high specific strength and flexible design ability. At present, the traditional forming process of CFRP curved surface components has problems of low mechanical properties and long processing time. In this paper, a new method of hot gas forming was proposed to obtain CFRP components. By applying high temperature and high-pressure gas on one side of CFRP, the material was forced to deform and solidify at the same time. A special device for hot gas forming was designed and developed. The curing behavior and mechanical properties of original CFRP plates were studied. The main defects and the corresponding control methods of hot gas forming parts were analyzed by forming spherical parts, and the feasibility of the hot gas forming process was verified. Taking the battery cover plate of a new energy vehicle as the research object, the influence of forming temperature, gas pressure, pressurization rate and other process parameters on the mechanical properties of complex CFRP components were analyzed. The mechanism of both strength and efficiency improvement was analyzed. The results showed that with the increasing of gas pressure, the tensile strength and forming efficiency of the CFRP curved components were improved obviously. Under reasonable forming parameters, the tensile strength of the obtained parts was increased by 37%, and the forming efficiency was increased by 58%. The fiber bundles were distributed more evenly and compactly under the hot gas forming. This showed that the use of hot gas forming had good potential in the preparation of high-performance CFRP parts, which was helpful to improve the processing efficiency and forming quality of CFRP curved parts in the aerospace and new energy automotive fields.

Thickness and Microstructure Analysis on Hot Gas Bulged Cup-Shaped Parts of Ti-22Al-24.5Nb-0.5Mo

2016 ◽  
Vol 716 ◽  
pp. 138-143
Author(s):  
Yong Wu ◽  
Gang Liu ◽  
Zhi Qiang Liu ◽  
Bei Bei Kong
Keyword(s):  
Mechanical Properties ◽  
Cylindrical Part ◽  
Outer Diameter ◽  
Jet Engines ◽  
Forming Process ◽  
Complex Phase ◽  
Hot Gas ◽  
Cylindrical Parts ◽  
Application Potential ◽  
Hot Gas Forming

Ti2AlNb based alloy has been paid more and more attention in recent years because of their high application potential in jet engines for good mechanical properties at high temperature. However, the control of microstructure and mechanical properties for components in sheet metal forming is very difficult because the complex phase transformation. In this paper, a cylindrical part was produced by hot gas forming and the formability of a Ti-22Al-24.5Nb-0.5Mo sheet with thickness of 2mm was studied at 985°C. It is found that the parts could be formed with small bottom-corner radius of 4mm with outer diameter of 60mm and the depth of 20mm. The strain distribution and thinning ratio of the parts were analyzed. The maximum thinning ratio was 56.3% near to the small corner. The microstructures of the original blank and the cylindrical parts were observed by optical microscopic (OM). It is found that the orthorhombic (O) phase and α2 phase significantly reduced during the forming process. On the other hand, at different position of the parts, different microstructures appear because of different strain values.

Effect of Heat Treatment on Tensile Strength and Microstructure of AZ61A Magnesium Alloy

2014 ◽  
Vol 606 ◽  
pp. 55-59 ◽  
Author(s):  
R. Senthil ◽  
A. Gnanavelbabu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Mg Alloys ◽  
Forming Process ◽  
Microstructural Parameters ◽  
Heat Treated ◽  
Mutual Relations

Magnesium alloys are the very progressive materials whereon is due to improve their end-use properties. Especially, wrought Mg alloys attract attention since they have more advantageous mechanical properties than cast Mg alloys. Investigations were carried out the effects of heat treatment on tensile strength and microstructure of AZ61A magnesium alloy. The AZ61A Mg alloy is solution heat treated at the temperature of 6500F (343°C) for various soaking timing such as 120 min, 240 min and 360 minutes and allowed it cool slowly in the furnace itself. Magnesium alloys usually are heat treated either to improve mechanical properties or as means of conditioning for specific fabrication operations. Special attention had been focused on the analysis of mutual relations existing between the deformation conditions, microstructural parameters, grain size and the achieved mechanical properties. The result after the solution heat treatment, showed remarkably improved hardness, tensile strength and yield strength. It would be appropriate for a forming process namely isostatic forming process.

scholarly journals Numerical and Experimental Investigation on Tube Hot Gas Forming Process for UHSS

2018 ◽  
Vol 1063 ◽  
pp. 012172
Author(s):  
Pengzhi Cheng ◽  
Yulong Ge ◽  
Yong Xia ◽  
Qing Zhou
Keyword(s):  
Experimental Investigation ◽  
Forming Process ◽  
Hot Gas ◽  
Hot Gas Forming

scholarly journals Hot Gas Forming of Aluminum Alloy Tubes Using Flame Heating

2020 ◽  
Vol 4 (2) ◽  
pp. 56 ◽  
Author(s):  
Ali Talebi-Anaraki ◽  
Mehdi Chougan ◽  
Mohsen Loh-Mousavi ◽  
Tomoyoshi Maeno
Keyword(s):  
Aluminum Alloy ◽  
Wall Thickness ◽  
Thickness Distribution ◽  
Forming Process ◽  
Hot Gas ◽  
Axial Feeding ◽  
Flame Heating ◽  
Lathe Machine ◽  
Aluminum Alloy Tube ◽  
Hot Gas Forming

Hot metal gas forming (HMGF) is a desirable way for the automotive industry to produce complex metallic parts with poor formability, such as aluminum alloys. A simple hot gas forming method was developed to form aluminum alloy tubes using flame heating. An aluminum alloy tube was heated by a flame torch while the tube was rotated and compressed using a lathe machine and simultaneously pressurized with a constant air pressure. The effects of the internal pressure and axial feeding on expansion and wall thickness distribution were examined. The results showed that the proposed gas forming method was effective for forming aluminum alloy tubes. It was also indicated that axial feeding is a vital parameter to prevent reductions in wall thickness by supplying the material flow during the forming process.

scholarly journals Investigation on precision and performance for hot gas forming of thin-walled components of Ti2AlNb-based alloy

2018 ◽  
Vol 190 ◽  
pp. 07001
Author(s):  
Xueyan Jiao ◽  
Zhiqiang Liu ◽  
Yong Wu ◽  
Gang Liu
Keyword(s):  
Process Parameters ◽  
Microstructure Evolution ◽  
Element Model ◽  
Parameters Optimization ◽  
Forming Process ◽  
Performance Control ◽  
Hot Gas ◽  
Thin Walled ◽  
And Performance ◽  
Hot Gas Forming

Ti2AlNb-based alloys have received considerable attention as potential materials to replace the nickel alloy at 600-750 °C, depending on their advantages of high specific strength, good corrosion and oxidation resistance. To realize the precision and performance control for Ti2AlNb-based alloy thin-walled components, the microstructure evolution was analyzed for setting up the unified viscoplastic constitutive equations based on the physical variables and simulating the forming process coupled between the deformation and the microstructure evolution. Through the finite element model with coupling of microstructure and mechanical parameters, the microstructure evolution and shape fabricating can be predicted at the same time, to provide the basis for the process parameters optimization and performance control. With the reasonable process parameters for hot gas forming of Ti2AlNb thin-walled components, the forming precision and performance can be controlled effectively.

Effects of High Pressure on Fe-Rich Phases and Mechanical Properties of Al-14Si Alloys with Rheo-Squeeze Casting

2019 ◽  
Vol 285 ◽  
pp. 57-62
Author(s):  
Chong Lin ◽  
Shu Sen Wu ◽  
Shu Lin Lü
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Ultrasonic Vibration ◽  
Squeeze Casting ◽  
Average Diameter ◽  
Solid Alloy ◽  
Forming Process ◽  
Semi Solid

The influence of high pressure and manganese on Fe-rich phases (FRPs) and mechanical properties of Al-14Si-2Fe alloy with rheo-squeeze casting (RSC) were investigated. The semi-solid alloy melt was prepared using ultrasonic vibration (UV), then formed by squeeze casting (SC). Results shows that the FRPs in as-cast Al-14Si-2Fe-(0.4,0.8)Mn alloys with SC are composed of coarse plate-shaped δ-Al4(Fe,Mn)Si2, long needle-shaped β-Al5(Fe,Mn)Si and bone-shaped α-Al15(Fe,Mn)3Si2phases when the pressure is 0 MPa. During the solidification of the alloys with RSC, the FRPs are first refined by UV, then furtherly refined as the pressure increases. With RSC, the FRPs in Al-14Si-2Fe-0.8Mn alloy are finer and rounder than that of the Al-14Si-2Fe-0.4Mn alloy under the same pressure. The FRPs in RSC Al-14Si-2Fe-0.8Mn alloy are mainly granular particles with an average diameter of about 12 μm under 300 MPa. For the alloy with the same composition, the ultimate tensile strength (UTS) of RSC sample is higher than that of the SC sample. Under the same forming process, the UTS of Al-14Si-2Fe-0.8Mn alloy is higher than that of the Al-14Si-2Fe-0.4Mn alloy.

Effect of curing cycles using wet prepreg processing on mechanical properties

2018 ◽  
Vol 32 (19) ◽  
pp. 1840076
Author(s):  
Chen Zixuan ◽  
Yu Tianyu ◽  
Kyung-Seok Jung ◽  
Chang-Wook Park ◽  
Soo-Jeong Park ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Manufacturing Process ◽  
Curing Temperature ◽  
Forming Process ◽  
Scanning Calorimetry ◽  
Reinforced Plastic ◽  
The Matrix ◽  
Matrix Reinforcement ◽  
Opposite Tendency

For the fabrication of polymer-based composite materials, the interpretation of an appropriate fabrication process is essential to improve the productivity and manufacturing process. In this study, the wet prepreg forming process was used to fabricate carbon fiber reinforced plastic (CFRP) and different curing cycles were demonstrated for an optimal process. To determine the range of curing temperature, a pretreatment on differential scanning calorimetry (DSC) analysis was performed. After that, tensile and ILSS tests were adopted to investigate the mechanical properties and thermal analysis on a matrix carried out by the DSC equipment. Different volumes of the matrix residue on fractured fiber, which represent the matrix-reinforcement adhesion strength, were observed by a scanning electron microscope (SEM). Also, a void aggregation was found in high curing temperature situation due to excessive exotherm. Both the tensile strength and ILSS held a certain trend with the changing curing cycles. The highest tensile strength (469 MPa) and glass transition temperature (Tg) at 91.58[Formula: see text]C occurred at 80[Formula: see text]C and 12 h curing temperature and time, respectively. The result of ILSS had an almost opposite tendency of the tensile strength. A correlation between Tg and mechanical properties was observed and it can be extensively applied to optimize the manufacturing process.

Simulation of Multi-step Tube Hot Gas Forming Process of a UHSS Torsion Beam

2021 ◽  
pp. 183-195
Author(s):  
Shangwen Ruan ◽  
Jianping Zhao ◽  
Zhenli Mi ◽  
Lan Su ◽  
Pengzhi Cheng
Keyword(s):  
Forming Process ◽  
Torsion Beam ◽  
Hot Gas ◽  
Hot Gas Forming
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