The design, fabrication and characterization of an advanced graphite composite structure for high speed rotating machines

Rosenwasser, S.N.; Nagy, Gábor; Mehle, Greg

doi:10.1109/20.738422

Cited by 8 publications

(6 citation statements)

References 3 publications

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“…Compact, durable and highly mobile power generators and motors are the necessity to the success of all electrical systems for military functions [1,2]. Due to its potential military application, extensive research has been conducted for Electric Machinery (EM) structural design, analysis, and mechanics on creep, fracture and fatigue features [3][4][5][6][7][8][9]. Because of the complex conductor winding geometry and the heterogeneity of the conductor and the composite insulations, the EM system usually has to be analyzed using numerical techniques, of which finite element method is most widely used.…”

Section: Introductionmentioning

confidence: 99%

Homogenization Modeling and Effective Mechanical Constants for EM Composite Conductor with Cooling Channel

Sun

Tzeng

2003

Journal of Composite Materials

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A homogenization modeling to predict the effective mechanical properties of electric machinery composite conductor consisting of metallic core with cooling channel, and multi-layer of insulating materials was presented. A two-level homogenization scheme to model complex composite with multi-phase materials and the validation of using finite element method was developed. Composite cylinder assembly model was adopted in the Level 1 homogenization for the metallic core and the cooling channel was analyzed as a fiber void with null material properties. The effective mechanical properties of the composite insulation layers were homogenized by smearing the properties of the multiple insulation layers of bonding, insulation and insulationfiber-reinforced composite. Level 2 homogenization derived nine effective mechanical constants for conductor through a combined homogenization sequences. The good comparisons between the analytical predictions and the results obtained from the finite element analyses demonstrated the applicability of the model.

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Section: Introductionmentioning

confidence: 99%

Homogenization Modeling and Effective Mechanical Constants for EM Composite Conductor with Cooling Channel

Sun

Tzeng

2003

Journal of Composite Materials

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“…Materials used in the conductor consist of electrical conducting core and outside insulating layer(s). The conductor core is made of conducting materials, such as copper, aluminum and copper alloys, to form low resistance electric circuits [4][5][6]. The fiber-reinforced polymer composite is used in the insulation because its constituent reinforced fiber and epoxy resin provide a good combination in mechanical property, thermal and insulating protection.…”

Section: Introductionmentioning

confidence: 99%

Effective mechanical properties of EM composite conductors: an analytical and finite element modeling approach

Sun

Tzeng

2002

Composite Structures

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An analytical model and numerical approach to predict the effective mechanical properties of a composite conductor consisting of metallic core and insulation layers are presented in this paper. The analytical model was developed based on a two-step homogenizations and mechanics analysis for composite unit cell. The Step 1 homogenization derives the effective properties of the out-wrapped composite insulation layers. The Step 2 homogenization further smears the metallic core and the effective composite insulation layers to develop homogenized mechanical properties for composite conductor according to appropriate homogenization sequences. The procedure of using numerical approach and finite element method to determine the unit cell effective constants were also described and the results of the FEA prediction were presented. The analytical predictions were compared well to the numerical results for the nine material constants that characterize the effective mechanical properties of the composite conductor.

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“…[1][2][3][4] Large polymer composite parts with complex shapes can be efficiently fabricated by the RTM process as compared to the traditional prepreg layup/autoclave cure process. 2,4 The RTM process is a closed-mold processing technique, which involves loading the fiber preform into a mold cavity, followed by an injection of a low-viscosity thermoset polymer resin under pressure and at elevated temperature and then curing the resin in situ to form the final parts.…”

Section: Introductionmentioning

confidence: 99%

Effect of material and process variables on the performance of resin-transfer-molded epoxy fabric composites

Lee

Wei

2000

J. Appl. Polym. Sci.

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The effects of material and process variables on glass fabric-reinforced epoxy composites by the resin-transfer molding (RTM) process were studied. It was found that the molded aged resin with 55% fiber exhibited twice the mold-filling time and caused a 7-15% deterioration in the interlaminar shear strength (ILSS) and in the flexural strength of the composites as compared to those of the composites molded with fresh resin. At a 55% fiber volume fraction, composites molded with aged resin resulted in a 35% longer filling time and a 4 -12% decreased ILSS and flexural strength as compared to those of the composites at a 44% fiber volume fraction. Moldings with a perimeter inlet exhibited a 65% shorter mold-filling time, 28% reduced void content, and 6% improved flexural strength as compared to those of the composites molded with the center inlet.

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The design, fabrication and characterization of an advanced graphite composite structure for high speed rotating machines

Cited by 8 publications

References 3 publications

Homogenization Modeling and Effective Mechanical Constants for EM Composite Conductor with Cooling Channel

Homogenization Modeling and Effective Mechanical Constants for EM Composite Conductor with Cooling Channel

Effective mechanical properties of EM composite conductors: an analytical and finite element modeling approach

Effect of material and process variables on the performance of resin-transfer-molded epoxy fabric composites

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