Effect of material internal pressure in curing process of SMC roll forming

Katayama, Tsutao; Hakotani, Masahiro; Shinohara, Masanao; Nishii, Keizo; Tabuchi, Hidekazu

doi:10.1016/j.jmatprotec.2004.04.255

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…The flowing of LPMC sheet during the process of molding was determined by some major factors such as the shape of molding material, location and fluidity of LPMC sheet and the velocity of adding pressure [8][9][10][11]. The fluidity of the sheet was determined by fiber, filler and resin.…”

Section: Controlling Of Fiber Orientationmentioning

confidence: 99%

Study on the Fiber Distribution and Fiber Orientation in Low Pressure Sheet Molding Compounds

Huang

2010

AMR

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LPMC specimens were burned in an oven at 500oC for 3h to obtain the fiber images by a scanner. The fiber distribution and orientation was analyzed using MATLAB software. And the effect parameters and controlling methods on fiber orientation and mechanic properties of molded parts were studied, too. Results showed that when the viscosity of LPMC sheet was 5×106cp , the feeding area was 60% and the velocity of mould closing was 1.0 mm/s, the uniformity of fiber distribution was optimum. And proper velocity of mould closing (1.0 mm/s) could decrease the fiber orientation. In addition, the flexural strength (185MPa) and flexural modulus (14.2GPa) of LPMC specimens paralleled the fiber direction were much higher than vertical one (75.2MPa, 6.9GPa).

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Section: Controlling Of Fiber Orientationmentioning

confidence: 99%

Study on the Fiber Distribution and Fiber Orientation in Low Pressure Sheet Molding Compounds

Huang

2010

AMR

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“…Mathivanan et al investigated the impact of fiber volume on aluminum/GFRP hybrid laminate test coupons and found that high fiber volume increased the elastic modulus, yield stress, and ultimate strength of the hybrid laminate. These findings have led to the development of various methods and processes that increase fiber volume but not defects . When controlled to fulfill design tolerance ranges, fiber volumes may provide optimal composite structures.…”

Section: Introductionmentioning

confidence: 99%

Fiber volume control of composite materials by loss angle

Yoshida

Kondo

2014

Polymer Composites

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Fiber volume plays a critical role in achieving stable mechanical and physical properties in composite structures. This study develops a method to control this parameter in carbon fiber reinforced plastics (CFRPs) on the basis of the viscoelastic character of the thermosetting matrix resin. This method relies on the loss angle δ to quantitatively control fiber volume. CFRP flat panels are manufactured at varying initiating times of pressure application depending on the δ value of the CFRP matrix resin. An analysis of the manufactured panels clearly shows that the target fiber volumes can be obtained at an appropriate δ range. Specifically, CFRP fiber volumes can be controlled through the loss angle of the matrix resin. Defining this δ range is very important for establishing mechanically and physically stable CFRP structures. POLYM. COMPOS., 37:1307–1311, 2016. © 2014 Society of Plastics Engineers

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“…A few studies on flexible electronics sensors, usually using solid components integrated into polymer materials, have focused on small scale pressure [ 18 ], temperature [ 19 , 20 ], and humidity [ 21 ] sensors. Fabrication technologies for flexible electronics include screen printing [ 22 ], ink-jet printing [ 23 , 24 ], and the roll to roll process [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Flexible Electronics Sensors for Tactile Multi-Touching

Chang

Fang

Yeh

et al. 2009

Sensors

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Flexible electronics sensors for tactile applications in multi-touch sensing and large scale manufacturing were designed and fabricated. The sensors are based on polyimide substrates, with thixotropy materials used to print organic resistances and a bump on the top polyimide layer. The gap between the bottom electrode layer and the resistance layer provides a buffer distance to reduce erroneous contact during large bending. Experimental results show that the top membrane with a bump protrusion and a resistance layer had a large deflection and a quick sensitive response. The bump and resistance layer provided a concentrated von Mises stress force and inertial force on the top membrane center. When the top membrane had no bump, it had a transient response delay time and took longer to reach steady-state. For printing thick structures of flexible electronics sensors, diffusion effects and dimensional shrinkages can be improved by using a paste material with a high viscosity. Linear algorithm matrixes with Gaussian elimination and control system scanning were used for multi-touch detection. Flexible electronics sensors were printed with a resistance thickness of about 32 μm and a bump thickness of about 0.2 mm. Feasibility studies show that printing technology is appropriate for large scale manufacturing, producing sensors at a low cost.

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Effect of material internal pressure in curing process of SMC roll forming

Cited by 6 publications

References 3 publications

Study on the Fiber Distribution and Fiber Orientation in Low Pressure Sheet Molding Compounds

Study on the Fiber Distribution and Fiber Orientation in Low Pressure Sheet Molding Compounds

Fiber volume control of composite materials by loss angle

Flexible Electronics Sensors for Tactile Multi-Touching

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