The Effects of Pin Profile on HDPE Thermomechanical Phenomena during FSW (original) (raw)
Related papers
Heat generation model for taper cylindrical pin profile in FSW
Journal of Materials Research and Technology, 2013
Al alloys a b s t r a c t Modeling offers great potential for reducing experimental effort in development of welding parameters, tool design and many other areas and at the same time reduce cost and time.
Thermomechanical model for monotonic and cyclic loading of PEEK
Mechanics of Materials, 2018
An internal state variable (ISV) model for polyether ether ketone (PEEK) is developed to capture experimental measurements conducted below its glass transition temperature. The model is based on the response of two relaxing components put in parallel, one having a back stress response that softens with plastic flow. This softening allows reproducing both monotonic and cyclic loading, and is possibly associated with detangling, melting of network junctions, and/or change in crystallinity. The resulting model, which is thermodynamic and multidimensional, was used to capture the response of PEEK 450G using thermal expansion (23˚C to 120˚C), heat capacity (-40˚C to 140˚C), monotonic extension and compression (-85˚C to150˚C; 0.0001 s-1 to 3000 s-1 ; strains up to 40-80%), equilibrium stress measurements in compression (23˚C to 120˚C; strains up to 60%), and ultrasonic longitudinal and shear wave speed measurements along and transverse to the directions of compression (23˚C to 120˚C; up to 50% plastic compression). The model is compared to the response under monotonic and cyclic shear and internal dissipation is assessed using the equivalent adiabatic temperature rise.
Thermal Stress Analysis and Optimization of FSW Process on UHMWPE by Using Hexagonal Tool Profile
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2023
The use of polymeric materials has grown widely in various sectors such as packaging, building, electronic, automotive, and aerospace industries. Particularly, Ultra-High Molecular Weight Polyethylene has wide engineering applications and is used in large quantities in automotive oil pans, gears, slides, cams, bearings, fluid reservoirs, and the sports industry. Friction Stir Welding (FSW) is a solid-state process in joining thermoplastic materials. In this investigation, FSW process must be applied to join a UHMWPE plate of 8 mm thickness with specially designed hexagonal tool pin profile. The aim of this study is to examine the effect of main friction stir welding (FSW) parameters on the quality of UHMWPE plate welds. FSW machine, using a tool with a stationary shoulder and no external heating system. The welding parameters studied were the tool rotational speed which varied between 1300 and 1500 (rpm); the traverse speed which varied between 15 and 25 (mm/min), and the axial force ranging from 8 to 10 (KN). Good quality welds are achieved without using external heating, when the tool rotational speed and axial force are above a certain threshold. For high rotational speed and axial force welds have poor material mixing at the retreating side and mild voids at the nugget, tensile strength also obtained very poor. The hardness angle distortion and bead geometry also evaluated. Taguchi design optimum parameters and ANNOVA were found.
International Journal of Fatigue, 2014
Design of SFRP parts against fatigue is clearly not an easy task due to the numerous dissipation mechanisms involved and to the strong anisotropy induced by the injection process. Another difficulty is to evaluate a relevant scale to compute the thermomechanical data, as the complex geometry of the parts can induce a variation within a distance comparable to or lower than the representative scale of the microstructure. In this study, injected samples with a geometry leading to a theoretical stress concentration factor K t ¼ 2:5 are under consideration. The samples are submitted to several cyclic blocks and the temperature fields are measured using an infrared camera. Taking advantage of the good thermal and spatial resolutions, a first analysis is performed on the temperature fields, allowing to highlight the hot spot location and to follow the crack propagation. A specific adiabatic analysis is then suggested in order to measure directly the fields of dissipated energy. To predict this field, a numerical chain is then applied involving the simulation of the injection process and finite elements analysis using an anisotropic elasto-viscoplastic model. The predicted heat sources are compared to the experimental ones for several loading amplitudes and the ability of the approach to catch the experimental fields is finally discussed.
Numerical modeling and prediction of thermomechanical degradation of power electronic packaging
2013
This work aims at numerical thermomechanical studies of two types of high temperature silver connections elaborated at low temperatures, the transient liquid phase bonding (TLPB) of Ag-In and silver nanoparticles sintering, using test vehicles representing the final packaging assemblies of diamond components. The simulation is performed using a finite element code on 2D and 3D assemblies. The stress distribution in the assemblies and in the two die-attachments was studied during thermal cycling in the range temperature between -50 and 300°C. A comparison of these two technology trends with respect to their applicability for power electronics packaging was conducted.
ESPI Analysis of Thermo-Mechanical Behavior of Electronic Components
Advancement of Optical Methods in Experimental Mechanics, Volume 3, 2016
Thermo-mechanical aspects must be conveniently taken into account when designing electronic components and devices. Reliability issues can in fact arise due to stress induced by thermal field acting on materials with different coefficients of thermal expansion. In this paper an optical system based upon Phase Shifting Electronic Speckle Interferometry (PS-ESPI) was developed; it allows analyzing the in-plane displacement map experienced by the tested component during its working operation as a consequence of the Joule's effect. The adoption of an optical technique allowed to get the measurement without contact with the component that is to say without altering the capability of thermal dissipation of the component. The system was demonstrated to be effective in analyzing asymmetries in the displacements along the component and in evaluating how different kinds of constraints can drastically affect the thermo-mechanical behavior of a given component. Furthermore the system was used to compare the thermo-mechanical response of the same component in presence or in absence of a critical defect. It was verified the ability of the set up designed to detect the very different thermomechanical response of a damaged electronic component with respect to an undamaged one.
Thermal Stress Analysis and Optimization of FSW Process on UHMWPE by Using Triangular Tool Profile
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2022
The use of polymeric materials has grown widely in various sectors such as packaging, building, electronic, automotive, and aerospace industries. Particularly, Ultra-High Molecular Weight Polyethylene has wide engineering applications and is used in large quantities in automotive oil pans, gears, slides, cams, bearings, fluid reservoirs, and the sports industry. Friction Stir Welding (FSW) is a solid-state process in joining thermoplastic materials. In this investigation, FSW process must be applied to join a UHMWPE plate of 10 mm thickness with specially designed triangular tool pin profile. The aim of this study is to examine the effect of main friction stir welding (FSW) parameters on the quality of UHMWPE plate welds. FSW machine, using a tool with a stationary shoulder and no external heating system. The welding parameters studied were the tool rotational speed which varied between 1300 and 1500 (rpm); the traverse speed which varied between 15 and 25 (mm/min), and the axial force ranging from 8 to 10 (KN). Good quality welds are achieved without using external heating, when the tool rotational speed and axial force are above a certain threshold. For high rotational speed and axial force welds have poor material mixing at the retreating side and mild voids at the nugget, tensile strength also obtained very poor. The hardness angle distortion and bead geometry also evaluated. Taguchi design optimum parameters and ANNOVA were found.
Journal of Materials Research and Technology, 2021
UHMWPE has exhibited excellent performance when used as contact surfaces in tribological contacts. Traditionally, only UHMWPE grades, with narrow particle size and molecular weight distribution, have been deemed suitable for such applications. Now, various UHMWPE grades are available that are different from each other based on their particle size and molecular weight distribution. The question of whether the particle size of UHMWPE affects its performance and properties presents a research gap. The present study attempts to address this question. Additionally, the effect of processing of the UHMWPE is studied. It is observed that although minor differences were observed in the properties of the various grades of UHMWPE, they are inadequate to conclusively determine that the particle size and processing effect the properties and performance of the material.