Thermal Analysis of Laser-Assisted Thermoplastic-Matrix Composite Tape Consolidation

1988 ◽  
Vol 110 (2) ◽  
pp. 424-430 ◽  
Author(s):  
E. P. Beyeler ◽  
S. I. Gu¨c¸eri
Keyword(s):  
Thermal Analysis ◽  
Complex Geometry ◽  
Heat Sources ◽  
Continuous Manufacturing ◽  
Continuous Fiber ◽  
Composite Tape ◽  
Thermoplastic Matrix ◽  
Novel Approach ◽  
Numerical Grid ◽  
Thermal Histories

A novel approach to producing composite parts using thermoplastic-matrix tapes is described. A thermal analysis is presented for the case of focused heat sources such as lasers for melting and consolidating the prepregs in a continuous manufacturing process. A numerical grid generation method is employed to account for the complex geometry of the solution domain. Heat transfer is modeled using an orthotropic domain made of two-dimensional, continuous fiber anisotropic laminates. Heat of crystallization melting/solidification are included in the form of a heat generation term. The temperature distributions and thermal histories in the laminated composites are presented for varying consolidation speeds. The effects of preheating the consolidated laminate are investigated and the overall feasibility of the proposed process is discussed.

Finite element method estimation of temperature distribution of automotive tire using one-way-coupled method

2021 ◽  
pp. 095440702110087
Author(s):  
Zumrat Usmanova ◽  
Emin Sunbuloglu
Keyword(s):  
Thermal Analysis ◽  
Temperature Distribution ◽  
Heat Generation ◽  
Complex Geometry ◽  
Rolling Resistance ◽  
Operating Conditions ◽  
Deformation Analysis ◽  
Coupled Method ◽  
Experimental Values ◽  
Hysteretic Loss

Numerical simulation of automotive tires is still a challenging problem due to their complex geometry and structures, as well as the non-uniform loading and operating conditions. Hysteretic loss and rolling resistance are the most crucial features of tire design for engineers. A decoupled numerical model was proposed to predict hysteretic loss and temperature distribution in a tire, however temperature dependent material properties being utilized only during the heat generation analysis stage. Cyclic change of strain energy values was extracted from 3-D deformation analysis, which was further used in a thermal analysis as input to predict temperature distribution and thermal heat generation due to hysteretic loss. This method was compared with the decoupled model where temperature dependence was ignored in both deformation and thermal analysis stages. Deformation analysis results were compared with experimental data available. The proposed method of numerical modeling was quite accurate and results were found to be close to the actual tire behavior. It was shown that one-way-coupled method provides rolling resistance and peak temperature values that are in agreement with experimental values as well.

Die-Less Forming of Thermoplastic- Matrix, Continuous-Fiber Composites

1990 ◽  
Vol 24 (4) ◽  
pp. 346-381 ◽  
Author(s):  
Alan K. Miller ◽  
Micha Gur ◽  
Ady Peled ◽  
Alexander Payne ◽  
Erik Menzel
Keyword(s):  
Fiber Composites ◽  
Continuous Fiber ◽  
Thermoplastic Matrix

Experimental and numerical thermal analysis of open-cell metal foams developed through a topological optimization and 3D printing process

2018 ◽  
Vol 83 (1) ◽  
pp. 10904 ◽  
Author(s):  
Abdelatif Merabtine ◽  
Nicolas Gardan ◽  
Julien Gardan ◽  
Houssem Badreddine ◽  
Chuan Zhang ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
3D Printing ◽  
Numerical Simulations ◽  
Lattice Model ◽  
Metal Foam ◽  
Complex Geometry ◽  
Metal Foams ◽  
Topological Optimization ◽  
Plaster Mold ◽  
Open Cell

This study focuses on the thermal analysis and comparing a lattice model and an optimized model of open-cell metal foams manufactured thanks to a metal casting process. The topological optimization defines the complex geometry through thermal criteria and a plaster mold reproduces it in 3D printing to be used in casting. The study of the thermal behavior conducted on the two open foam metal structures is performed based on several measurements, as well as numerical simulations. It is observed that the optimized metal foam presented less and non-homogenous local temperature than the lattice model with the gap of about 10 °C between both models. The pore size and porosity significantly affect the heat transfer through the metal foam. The comparison between numerical simulations and experimental results regarding the temperature fields shows a good agreement allowing the validation of the developed three-dimensional model based on the finite element method.

A Novel Approach to Model Moving Heat Sources

2010 ◽  
pp. 245-245-8
Author(s):  
F. D. Fischer ◽  
C. Krempaszky ◽  
J. Očenášek ◽  
E. Werner
Keyword(s):  
Heat Sources ◽  
Novel Approach

Non-Linear Analysis of Bio-Structures Through Refined Beam Models

2018 ◽  
Author(s):  
Daniele Guarnera ◽  
Erasmo Carrera ◽  
Ibrahim Kaleel ◽  
Alfonso Pagani ◽  
Marco Petrolo
Keyword(s):  
Complex Geometry ◽  
Local Effect ◽  
The Finite Element Method ◽  
Nonlinear Analyses ◽  
Linear Behavior ◽  
Novel Approach ◽  
Non Linear ◽  
Out Of Plane ◽  
Carrera Unified Formulation ◽  
Linear Material

A novel approach for the analysis of the non-linear behavior of bio-structures is presented here. This method is developed in the framework of the Carrera Unified Formulation (CUF), a higher-order 1D theory according to which the kinematics of the problem depends on the arbitrary expansion of the generalized unknowns. Taylor-like (TE) and Lagrange-like expansion functions (LE) are employed to describe the kinematic field along the cross-section and, the finite element method (FEM) is used to formulate the governing equations. In this work, the effects of material nonlinearities are investigated and, the problem is solved by using the Newton-Raphson method. An atherosclerotic plaque of an artery is introduced as a typical bio-structure with complex geometry and studied for both linear and non-linear material cases. The results from the proposed technique highlight the accuracy of the in-plane and out-of-plane stress/strain distributions for different 1D models. The 3D-like accuracy of local effect predictions, the possibility of dealing with complex geometries, and low computational costs of nonlinear analyses make the present formulation appealing for biomechanical applications.

scholarly journals Design of a Carbon Fiber Bicycle Stem using a Novel Internal Bladder Resin Transfer Molding Technique

2010 ◽  
Vol 19 (1) ◽  
pp. 096369351001900
Author(s):  
Maxime Thouin ◽  
Hossein Ghiasi ◽  
Larry Lessard
Keyword(s):  
Carbon Fibre ◽  
Complex Geometry ◽  
Resin Transfer Moulding ◽  
Composite Manufacturing ◽  
Transfer Molding ◽  
Novel Approach ◽  
Small Complex ◽  
Fibre Composites ◽  
Transfer Moulding ◽  
Carbon Fibre Composites

The goal of this research is to design, analyze, and manufacture a carbon fibre bicycle stem that maximizes the use of carbon fibre composites. The stem is a part of the bicycle that connects the handlebar to the fork. The design is difficult due to the small size and complex geometry of the part, thus not obvious to conceive with a standard composite manufacturing approach. A novel approach using an inner bladder resin transfer moulding (RTM) technique is used to manufacture the bicycle stem. The design of the moulds incorporates some efficient devices to facilitate various steps in the manufacturing process. The resulting design is successful in terms of weight, stiffness, strength, and aesthetic properties. The developed technique used in this project can be applied as a possible solution to the design and fabrication of small, complex, hollow composite parts.

Die-less Forming of Thermoplastic-Matrix Continuous Fiber Composite Materials—Process and Demonstration

1995 ◽  
Vol 117 (4) ◽  
pp. 501-507 ◽  
Author(s):  
K. Ramani ◽  
A. K. Miller ◽  
M. R. Cutkosky
Keyword(s):  
Composite Materials ◽  
Induction Heating ◽  
Fiber Composite ◽  
Fiber Composites ◽  
Uniform Heating ◽  
Continuous Fiber ◽  
Thermoplastic Matrix ◽  
Bending Behavior ◽  
Fiber Composite Materials ◽  
Heating Profile

Conventionally, large components made of thermoplastic matrices and continuous fibers are manufactured in autoclaves using dies. As the applications of composite materials increase, there is a need to reduce costs and increase manufacturing flexibility. This need has led to the development of a new concept called “die-less forming”. The concept of “kinematically admissible bending” is central to the concept of die-less forming. The concepts behind die-less forming have been tested in preliminary experiments on a two-roller demonstration machine. Induction heating was used to locally heat the composite as it moved into the forming zone, where it was bent using a specially designed cluster roller. Induction heating combined with a variable velocity profile was successful in establishing a uniform heating profile. Experiments were conducted for multidirectional APC-2 carbon/PEEK fiber composites and the composite bending behavior was explained using energy methods.

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