Thermal Analysis for Resistance Welding of Large-Scale Thermoplastic Composite Joints

1993 ◽  
Vol 12 (6) ◽  
pp. 723-736 ◽  
Author(s):  
Scott T. Holmes ◽  
John W. Gillespie
Keyword(s):  
Thermal Analysis ◽  
Large Scale ◽  
Thermoplastic Composite ◽  
Resistance Welding ◽  
Composite Joints

A Preliminary Study on Small Thermoplastic Composite Wind Turbine Blade Design and Fabrication

2015 ◽  
Author(s):  
Juan Garate ◽  
Stephen A. Solovitz ◽  
Dave Kim
Keyword(s):  
Wind Turbine ◽  
Turbine Blade ◽  
Large Scale ◽  
Chord Length ◽  
Wind Turbine Blade ◽  
Thermoplastic Composite ◽  
Horizontal Axis Wind Turbine ◽  
Limit Condition ◽  
Glass Fiber Reinforced ◽  
Turbine Blade Design

Today a large-scale wind turbine blade can be 70 m long and 5 m in root chord length, and it is fabricated in a single piece. This feature leads to high initial costs, as transportation of a large blade requires special trucks, escorts, and road adaptations. These constraints can account for approximately 6–7% of the total investment for the blade. In addition, the manufacturing process commonly used is a hand lay-up configuration of thermoset composite sheets. These materials are not reusable after fabrication, which is a non-renewable feature of existing systems. The project consists of manufacturing thermoplastic composite blades in segments, which are joined before installation at the turbine site. This paper addresses the preliminary research results when conducting design and fabrication of a small blade with this innovative approach. Three segmented blades are manufactured for a horizontal-axis wind turbine, with each blade having a 50 cm span and a 4 cm tip chord length. The blade size and profile are designed based on the idealized Betz limit condition. The material used for manufacturing is a glass fiber reinforced thermoplastic composite system with a polypropylene matrix that melts at 200 °C. Each blade is fabricated in 4 independently manufactured pieces, consisting of top/bottom, and tip/root segments, via a vacuum assisted thermoforming technique. The parts will be assembled afterwards by a joining process, forming the final part for site testing.

Scaling issues in resistance-welded thermoplastic composite joints

1997 ◽  
Vol 16 (4) ◽  
pp. 279-295 ◽  
Author(s):  
Steven H. McKnight ◽  
Scott T. Holmes ◽  
John W. Gillespie ◽  
Cynthia L. T. Lambing ◽  
James M. Marinelli
Keyword(s):  
Thermoplastic Composite ◽  
Composite Joints

scholarly journals Thermoplastic composite beam structures from mixtures of recycled HDPE and rubber crumb for acoustic energy absorption

2016 ◽  
Vol 31 (1) ◽  
pp. 119-142 ◽  
Author(s):  
B Haworth ◽  
D Chadwick ◽  
L Chen ◽  
YJ Ang
Keyword(s):  
Large Scale ◽  
Ad Hoc ◽  
Flexural Modulus ◽  
Acoustic Energy ◽  
Thermoplastic Composite ◽  
Rubber Crumb ◽  
Frequency Range ◽  
Compression Moulding ◽  
Graded Structures ◽  
Recycled Hdpe

The use of recycled rubber crumb in the design and production of thermoplastic-rubber composites as sound absorbers can provide solutions to noise pollution and for the recovery of post-consumer materials from both packaging and waste tyres. The work of this study is concerned with the effect of rubber crumb incorporation in high-density polyethylene (HDPE) and also in HDPE glass fibre composites on acoustic, mechanical and physical properties. Recycled HDPE compounds containing variable concentrations of cured rubber crumb particles were prepared by twin screw extrusion. Thermal analysis has revealed a significant increase in the level of crystallinity of the HDPE component by increasing the rubber content in the mixes. Standard three-point bending and notched impact test specimens were manufactured by injection moulding, and large-scale beam samples were produced by compression moulding using an ad hoc method that allows variation of the through-thickness elastomer content as a means of obtaining composition gradients. The flexural modulus and impact strength varied monotonically with rubber crumb concentration. A fast Fourier transform technique was used to determine the acoustic performance of the beams over a wide frequency range. The graded structures produced large improvements in acoustic absorption properties in the frequency range of 2–6 kHz, notably from composite beams containing 20% rubber and also in some multilayer beams with rubber concentration gradients.

Experimental Investigation of Processing Welding Parameters for PPS/Carbon Fiber Laminates for Aeronautical Applications

2016 ◽  
Vol 1135 ◽  
pp. 62-74 ◽  
Author(s):  
Samia Danuta Brejão de Souza ◽  
Ana Beatriz R.M. Abrahão ◽  
Michelle Leali Costa ◽  
José Maria F. Marlet ◽  
Luis Rogerio O. Hein ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Carbon Fiber ◽  
Large Scale ◽  
Surface Preparation ◽  
Electrical Current ◽  
Thermomechanical Analysis ◽  
Resistance Welding ◽  
Welding Parameters ◽  
Lap Shear ◽  
Vibration Tests

An experimental investigation of the resistance welding of PPS/carbon fiber is presented in this manuscript. Currently, one of the main problems of the structural polymer composites consists in its effective integration of the components. The electrical resistance welding has been considered as one of the promising techniques for bonding composites, because it is a quick process with easy surface preparation. To improve the process to welding poly-(phenylene sulfide) (PPS) reinforced with carbon fiber laminates, it was used a full factorial design (23). Considering the factors pressure, electrical current and time, the more appropriate conditions for welding were evaluated based on a criterion of maximum lap shear strength, according to ASTM D1002-10. A comparison between welded and non-welded specimens in terms of analysis dynamic mechanical (DMA), thermomechanical analysis (TMA) and vibration tests was performed. It was demonstrated that large-scale DMA presented a similar results but according to TMA and vibration test were observed that welded specimens presented different results when compared to non-welded laminates, due probably to the presence of metallic heating element.

Application of Stochastic Finite Element Method to Thermal Analysis for Computer Cooling

1993 ◽  
Vol 115 (3) ◽  
pp. 270-275 ◽  
Author(s):  
Shigekazu Kieda ◽  
Noriyuki Ashiwake ◽  
Takahiro Daikoku ◽  
Shizuo Zushi
Keyword(s):  
Finite Element Method ◽  
Thermal Analysis ◽  
Finite Element ◽  
Large Scale ◽  
Stochastic Finite Element Method ◽  
Statistical Features ◽  
Stochastic Finite Element ◽  
General Technique ◽  
Temperature Variations ◽  
Element Method

A stochastic finite element method is applied to thermal analysis of cooling in large-scale computers using a multi-fin flexible thermal contactor. The stochastic finite element method is a general technique to incorporate the effect of stochastic or statistical features of parameters into a finite element method by means of sensitivity analysis. Using this method, the temperature distribution of the chip is calculated, and also temperature variations associated with variations of thermal properties, heat generation rates, and uncertainties involved in real systems are estimated. Following presentation of the results obtained, the thermal performance of this system and applicability of the stochastic finite element method to computer cooling problems are discussed.

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