scholarly journals Novel Reactive Flex Configuration in Kiwi Wing Foil Surfboard

2021 ◽  
Vol 6 (1) ◽  
pp. 6
Author(s):  
Adrien M. Fat Cheung ◽  
Klaudio Bari
Keyword(s):  
Carbon Fibre ◽  
High Performance ◽  
Large Deflection ◽  
Mechanical Performance ◽  
Ocean Waves ◽  
Core Material ◽  
Flexural Stress ◽  
Compression Moulding ◽  
Element Analysis ◽  
Fea Simulation

The creation of an ideal surfboard is art. The design and construction depend on the individual surfer’s skill level and type of the required performance. In this research, four fuselage concepts were carefully explored to meet the following unique needs: lightweight, strong, and a fast-manufacturing process. The fuselages were manufactured by compression moulding using skin and core materials. The skin material was selected to be unidirectional (UD) carbon fibre, discontinuous carbon fibre (SMC) and Filava quadriaxial fibre impregnated with epoxy, while the core material was selected to be lightweight PVC foam. To assess the mechanical performance, three-point bending has been performed according to BS-ISO 14125 and validated using Finite Element Analysis (FEA) using Ansys software. As expected, the flexural test revealed that the UD carbon fibre fuselage was the strongest and SMC was the weakest, while large deflection was seen in Filava fibre fuselages before failure, showing great reactive flex that promotes projection during surfing. The experimental results show good agreement with FEA simulation, and the locations of the physical failure in the fuselage matches the location of maximum flexural stress obtained from FEA simulation. Although all fuselages were found to carry a surfer weight of 150 kg, including a factor of safety 3, except the SMC fuselage, due to shrinkage. The Filava fibre fuselages were seen to have a large deflection before failure, showing great flexibility to handle high ocean waves. This promotes the potential use of reactive flex in high performance sports equipment, such as surfing boards. A large shrinkage must be taken under consideration during compression moulding that depends on fibre orientation, resin nature, and part geometry.

A CASE STUDY OF BIOCOMPOSITE MATERIAL USE IN AUTOMOTIVE APPLICATIONS

2021 ◽  
Author(s):  
DANIEL WALCZYK ◽  
RONALD BUCINELL ◽  
STEVEN FLEISHMAN ◽  
SHARMAD JOSHI
Keyword(s):  
High Performance ◽  
Mechanical Performance ◽  
Flexural Modulus ◽  
Tensile Modulus ◽  
Maximum Tensile Stress ◽  
High Viscosity ◽  
Flexural Stress ◽  
Fiber Volume ◽  
Low Viscosity ◽  
Biocomposite Material

Interest in biocomposites is growing worldwide as companies that manufacture high-performance products seek out more sustainable material options. Although there is significant research on biocomposite material options and processing found in the literature from at least the last two decades, there are few experimentally based case studies published to help guide product designers and engineers when considering these materials. This paper discusses the use of biocomposites in the seat of an electric bus. Although it is clear that biocomposite material options are quite limited, the authors eventually settled on three natural reinforcements (cellulose, hemp, flax), two epoxies (one low and the other high viscosity) with high biobased carbon content, and one flax precoated with bioepoxy for consideration. Laminate plates with a 4mm nominal thickness are manufactured using VARTM (low viscosity epoxy only), hand layup as a surrogate for prepregging (high viscosity epoxy only), compression molding, and an out-of-autoclave process called the Pressure Focusing Layer (PFL) method. Permeability of the three reinforcements infused with the high viscosity epoxy and fiber volume fractions are determined experimentally to provide insight into VARTM processing and mechanical performance. The tensile modulus, maximum tensile stress, flexural modulus, and maximum flexural stress are measured for all combinations of reinforcement, resin, and processing using tension testing and three-point bending based on ASTM standards. Basic conclusions are drawn about the specific application and more generally about the process of using biocomposites in commercial products.

Effect of Zr Diffusion Barrier Properties on the Irradiation Performance of U-10Mo Monolithic Fuel Plate

2019 ◽  
Author(s):  
Walid Mohamed ◽  
Hakan Ozaltun ◽  
Hee Seok Roh
Keyword(s):  
Mechanical Properties ◽  
Diffusion Barrier ◽  
High Performance ◽  
Mechanical Performance ◽  
Plate Thickness ◽  
Barrier Properties ◽  
Element Analysis ◽  
Uranium Fuel ◽  
High Enrichment ◽  
Irradiation Performance

Abstract The most recent design of U-Mo monolithic fuel as adopted by the U.S. for the conversion of its High Performance Research Reactors (USHPRR) from high enrichment uranium (HEU) to low enrichment uranium fuel (LEU, < 20% U235) consists of a high density (LEU) U-10Mo fuel sandwiched between Zirconium (Zr) diffusion barriers and encapsulated in aluminum (AA6061) cladding. In this work, finite element analysis (FEA) was used to evaluate effect of Zr diffusion barrier properties on the thermal and mechanical performance of a U-10Mo monolithic fuel plate by considering possible variation in thermal and mechanical properties of the Zr diffusion barrier. Possible variation in thermo-mechanical properties of the Zr diffusion barrier were determined and a simulation matrix was designed accordingly. Analyses of simulation results included determination of global peak stresses in the fuel, Zr diffusion barrier, and cladding sections as well as the plate thickness profile at a transverse section toward the top side of the plate. Results showed that variation in yield stress, elastic modulus and thermal conductivity of the Zr diffusion barrier has negligible effect on the thermal and mechanical performance of the monolithic fuel plate. The effect of variation in these properties was found to be limited to the barrier section itself, which may be attributed to the relatively smaller thickness of that section compared to the fuel and cladding sections of the fuel plate.

Manufacturing and Testing of High Performance Sheet Moulding Compound

2008 ◽  
Vol 32 ◽  
pp. 141-144
Author(s):  
Meng Hou ◽  
Lin Ye
Keyword(s):  
High Performance ◽  
Mechanical Performance ◽  
Processing Conditions ◽  
Compression Moulding ◽  
Burst Test ◽  
Moulding Compound ◽  
Overall Performance ◽  
Tooling Design ◽  
Sheet Moulding Compound

The paper describes the manufacture of thin composite panels using high performance sheet moulding compound (SMC). Topics discussed within the paper include characterisation of curing and flow behaviour of SMC material, tooling design concept and determination of suitable processing conditions for compression moulding. A Full scale “Burst test” was carried out to evaluate the mechanical performance of SMC panels. The overall performance of the SMC panels was satisfactory with all panels failed beyond the specification value. The main failure mode was a through-thickness cracking. In addition, a geometrical non-linear numerical analysis was also carried out to investigate the stress distribution and deflection behaviour of SMC panel during “Burst testing”.

scholarly journals An Enhanced UHPC-Grout Shear Connection for Steel-Concrete Composite Bridges with Precast Decks

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Yongtao Zhang ◽  
Hehui Zheng ◽  
Minghao Tang ◽  
Zhiqi He
Keyword(s):  
High Performance ◽  
Mechanical Performance ◽  
High Performance Concrete ◽  
Frictional Resistance ◽  
Shear Capacity ◽  
Interface Shear ◽  
Element Analysis ◽  
Shear Connection ◽  
Composite Bridges ◽  
Push Out

This article develops an enhanced UHPC-grout shear connection for steel-concrete composite bridges with precast decks. The primary improvement is the use of ultra-high performance concrete (UHPC) as the connection grout. To validate the constructability and the mechanical performance of the new connection, two series of experimental tests (including grouting tests and push-out tests) were conducted. Results from the grouting tests show that both the pressure grouting method and the self-levelling grouting method are applicable to inject the UHPC grout into the channel void of the connection. Results from the push-out tests indicate that the advanced properties of UHPC allow for a significant improvement of the shear resistance of the adhesive connection over traditional cementitious grouts. The ultimate shear capacity of the adhesive connection is controlled by the interface shear strength between the embossed steel and the UHPC grout, with a cohesion value of approximately 5.87 MPa. Meanwhile, the residual frictional resistance can be taken as approximately one-half of the ultimate resistance. The results of the finite-element analysis show that the trilinear model is reasonable to simulate the shear-slip laws of the embossed steel-grout interface and the rough concrete-grout interface.

scholarly journals Biomechanical Evaluation of a Tooth Restored with High Performance Polymer PEKK Post-Core System: A 3D Finite Element Analysis

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Ki-Sun Lee ◽  
Joo-Hee Shin ◽  
Jong-Eun Kim ◽  
Jee-Hwan Kim ◽  
Won-Chang Lee ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cyclic Loading ◽  
High Performance ◽  
Core Material ◽  
Element Analysis ◽  
Core System ◽  
High Performance Polymer ◽  
Core Materials

The aim of this study was to evaluate the biomechanical behavior and long-term safety of high performance polymer PEKK as an intraradicular dental post-core material through comparative finite element analysis (FEA) with other conventional post-core materials. A 3D FEA model of a maxillary central incisor was constructed. A cyclic loading force of 50 N was applied at an angle of 45° to the longitudinal axis of the tooth at the palatal surface of the crown. For comparison with traditionally used post-core materials, three materials (gold, fiberglass, and PEKK) were simulated to determine their post-core properties. PEKK, with a lower elastic modulus than root dentin, showed comparably high failure resistance and a more favorable stress distribution than conventional post-core material. However, the PEKK post-core system showed a higher probability of debonding and crown failure under long-term cyclic loading than the metal or fiberglass post-core systems.

SLID Bonding for Energy Dense Applications – Thermo-Mechanics

2012 ◽  
Vol 2012 (HITEC) ◽  
pp. 000104-000109
Author(s):  
Andreas Larsson ◽  
Torleif André Tollefsen
Keyword(s):  
High Performance ◽  
Mechanical Performance ◽  
Bonding Temperature ◽  
Effective Strain ◽  
Process Temperature ◽  
Generic Properties ◽  
Element Analysis ◽  
Brushless Dc ◽  
Die Attach ◽  
Electronic Assemblies

Solid-Liquid Inter-Diffusion (SLID) bonding is traditionally a technology used for high performance and high reliable die attach/interconnect applications. The generic properties of SLID allows the bonding to occur at a relatively low process temperature. However, when the bond is completed, the final joint has a melting point well above the process temperature. This makes it well suited as for high performance electronic assemblies. The typical bonding temperature of Cu-Sn SLID and Au-Sn SLID are 250–300 °C and 320–350 °C respectively. These temperatures compare to that of other high temperature (HT) electronic adhesives e.g. Staystik® 101G. The thermal performance of the SLID bond is superior to other electronic interface materials. This is due to the thin joint (∼ 10 μm) and the high thermal conductivity (∼ 60 W/m·K for Au-Sn). Thus, the thermal resistance of a SLID joint, about 2×10−3 cm2·K/W, is significantly lower than most other thermo-mechanical joints suitable for use in electronic assemblies. SLID joints have also proven to be mechanically robust for harsh environment applications. In this study the thermo-mechanical properties of large Cu-Sn SLID bond are investigated. Simulations are performed to explore the stationary thermo-mechanical performance of the joint. Finite element analysis (FEA) is used to perform the simulations. The study is based on a case study involving a HT (> 200 °C) power controller device for a brushless DC motor for downhole applications. The effective strain was found to be high in the bond adjacent Cu layers but reasonably small, < 1%, within the joint itself.

scholarly journals Melt-Blended Multifunctional PEEK/Expanded Graphite Composites

2021 ◽  
Vol 8 ◽  
Author(s):  
Mozaffar Mokhtari ◽  
Edward Archer ◽  
Noel Bloomfield ◽  
Eileen Harkin-Jones ◽  
Alistair Mcilhagger
Keyword(s):  
Electrical Conductivity ◽  
High Performance ◽  
Mechanical Performance ◽  
Flexural Modulus ◽  
Three Dimensional ◽  
Expanded Graphite ◽  
Elastic Behaviour ◽  
Wear Properties ◽  
Flexural Stress ◽  
Sem Images

In this work, antistatic, high-performance composites of poly (ether ether ketone) (PEEK) and concentrations of 0.5–7 vol% expanded graphite (EG) were fabricated via twin-screw extrusion and injection moulding at mould temperatures of 200°C. The morphological, electrical, rheological, thermal, mechanical, and wear properties of the composites were investigated. Scanning electron microscope (SEM) images indicate that distribution and dispersion of EG platelets in the PEEK matrix are enhanced at higher EG loadings. The electrical conductivity of the composites with 5 vol% of EG exhibits a sharp rise in the electrical conductivity range of antistatic materials because of the formation of conductive paths. The formation of a three-dimensional EG network led to a rapid increase in the storage modulus of the melt of the 2 vol% of EG-loaded composite at a frequency of 0.1 rad/s and temperature of 370°C. The neat PEEK and composites containing 0.5–5 vol% EG indicated a cold-crystallisation peak in the first heating scan of a non-isothermal differential scan calorimetry (DSC) test and their crystallinity degrees changed slightly. However, after removing their thermal and stress histories, the EG platelets promoted nucleation and increased the PEEK crystallinity remarkably, indicating that annealing of the PEEK composites can improve their mechanical performance. The neat PEEK exhibits the standard tensile and flexural stress-strain behaviour of thermoplastics, and the composites exhibit elastic behaviour initially followed by a weak plastic deformation before fracture. The addition of 5 vol% of EG to PEEK increased the tensile and flexural modulus from 3.84 and 3.55 GPa to 4.15 and 4.40 GPa, decreased the strength from 96.73 and 156.41 MPa to 62 and 118.19 MPa, and the elongation at break from 27.09 and 12.9% to 4 and 4.6%, respectively. The wear resistance of the composite containing 3 vol% EG was enhanced by 37% compared with the neat PEEK.

Finite Element Analysis-Based Thermo-Mechanical Performance Study of Heavy Vehicle Medium Duty Transmission Gearbox

2021 ◽  
pp. 322-336
Author(s):  
Ashwani Kumar ◽  
Yatika Gori ◽  
Pravin P. Patil
Keyword(s):  
High Performance ◽  
Mechanical Performance ◽  
Elastohydrodynamic Lubrication ◽  
Gear Train ◽  
Performance Study ◽  
Element Analysis ◽  
Gear Teeth ◽  
Oil Mist ◽  
Gear Oil ◽  
Reverse Gear

The main objective of this chapter is to investigate the performance of automobile transmission gearbox under the influence of load, rotational speed, and lubrication on multi speed gearbox gear surface. Gear oil SAE 80W-90 was used as gearbox lubricant, for cooling of transmission gearbox for high performance. An assumption has been made at the air-gear oil mist within transmission is under steady state condition, in isothermal equilibrium with the transmission gear oil bath of lubricant. The lubrication in multi speed transmission is subjected to thermo-elastohydrodynamic lubrication. The present chapter deals with the thermo-mechanical performance study of multi speed transmission (4 speed, excluding reverse gear) system, which combines transient structure analysis of the gear train assembly. The engaged gear teeth pairs transmit torque subjected to thermo-elastohydrodynamic arrangements of lubrication. The study here analyzed transmission in second gear pair.

Effects of Fission Profiles on the Performance of a U-10Mo Fuel Plate

2019 ◽  
Author(s):  
Hee Seok Roh ◽  
Walid Mohamed ◽  
Hakan Ozaltun
Keyword(s):  
High Performance ◽  
Mechanical Performance ◽  
Experimental Tests ◽  
Operating Conditions ◽  
Fuel Performance ◽  
Element Analysis ◽  
Actual Use ◽  
Enriched Uranium ◽  
Performance Research ◽  
Plate Geometry

Abstract In order to convert the high-performance research reactors from High Enriched Uranium (HEU) to Low Enriched Uranium (LEU) fuel, U-Mo alloy-based fuels in monolithic form have been proposed. These plate-type fuels consist of a high density and low enriched uranium (LEU) foil coated with a diffusion barrier and encapsulated with the aluminum cladding. The performance of the fuel plate has been evaluated by many studies through experimental tests and numerical analyses. When evaluating the performance of a fuel, it is expensive and time-consuming to consider a variation of several parameters, such as fuel plate geometry, material properties, and operating conditions. Fission profile is a critical component of the fuel performance analysis, causing swelling and creep deformation of the fuel plate. Therefore, it can directly affect the stress and strain distributions over the fuel plate. This study aims at investigating the effect of different fission profiles on the thermo-mechanical performance of the fuel plate by finite element analysis. To investigate the effect of fission profile on fuel performance, several different fission profiles were generated and analyzed. The fission profiles were generated based on actual use.

Parallel Computing for Tire Simulations

2011 ◽  
Vol 39 (3) ◽  
pp. 193-209 ◽  
Author(s):  
H. Surendranath ◽  
M. Dunbar
Keyword(s):  
High Performance ◽  
Effective Means ◽  
Cost Effective ◽  
Turnaround Time ◽  
Careful Consideration ◽  
Rolling Contact ◽  
Element Analysis ◽  
Parallel Solvers ◽  
Design Changes ◽  
Highly Nonlinear

Abstract Over the last few decades, finite element analysis has become an integral part of the overall tire design process. Engineers need to perform a number of different simulations to evaluate new designs and study the effect of proposed design changes. However, tires pose formidable simulation challenges due to the presence of highly nonlinear rubber compounds, embedded reinforcements, complex tread geometries, rolling contact, and large deformations. Accurate simulation requires careful consideration of these factors, resulting in the extensive turnaround time, often times prolonging the design cycle. Therefore, it is extremely critical to explore means to reduce the turnaround time while producing reliable results. Compute clusters have recently become a cost effective means to perform high performance computing (HPC). Distributed memory parallel solvers designed to take advantage of compute clusters have become increasingly popular. In this paper, we examine the use of HPC for various tire simulations and demonstrate how it can significantly reduce simulation turnaround time. Abaqus/Standard is used for routine tire simulations like footprint and steady state rolling. Abaqus/Explicit is used for transient rolling and hydroplaning simulations. The run times and scaling data corresponding to models of various sizes and complexity are presented.

Sign in / Sign up

Export Citation Format

Share Document