Evaluation of Automotive Hood and Bumper Performance With Composite Material by Pedestrian Impactor Systems

2020 ◽  
Author(s):  
Obaidur Rahman Mohammed ◽  
D. V. Suresh ◽  
Hamid M. Lankarani
Keyword(s):  
Composite Material ◽  
Weight Reduction ◽  
Material Selection ◽  
Head Acceleration ◽  
Safety Issues ◽  
Frontal Collision ◽  
Steel Material ◽  
Reinforced Plastic ◽  
New Material ◽  
Frontal Collisions

Abstract The quality and reliability of vehicle safety in the automotive industry has greatly improved over the last years. Automotive manufacturers are constantly investigating the potential for enhancing rigidity for passenger car components and reducing the vehicle’s weight costs. Frontal elements such as the hood and bumper are more complex to analyze during the frontal collisions for weight reduction with the same rigidity and shape design. The objective of this study is to examine the crash efficiency of a vehicle’s hood and bumper with additive composite materials for enhancement of the design. The system is evaluated with the FE upper legform and adult headform impactor sub-system models. Under EEVC WG17 regulations, finite element simulations are performed with a sedan vehicle model. Analysis of the head impact on the car hood, subsequent head acceleration and HIC values were analyzed using pedestrian impactor. Differences in simulation results are examined for steel and composite material for better material selection. To estimate the weight reduction and pedestrian protection, a comparison between the composite material and the steel material is performed for the sedan vehicle. The study, thus, examines safety issues regarding the new material Carbon fiber-reinforced plastic (CFRP) for vehicle front-end and whether it would be less safe to use during frontal collision for weight reduction and comprehension behavior on pedestrian injuries.

Study on the Head Impacting Properties of Foam Composite Material Engine Hood

2010 ◽  
Vol 156-157 ◽  
pp. 303-306
Author(s):  
Gui Fan Zhao ◽  
Tso Liang Teng ◽  
Dong Cui
Keyword(s):  
Composite Material ◽  
Finite Elements ◽  
Dynamic Response ◽  
Steel Material ◽  
Foam Composite ◽  
New Material ◽  
Finite Elements Model

The head impacting properties and the lightweight effect of a kind of foam composite material engine hood are studied in this paper. The finite elements model of headform impactor impacting the engine hood is created, LS-DYNA is used to do the simulation of impacting, the dynamic response of original steel material and foam composite material are simulated. The results show that using foam composite material can reduce the injury value of pedestrian head. In the end, the lightweight effect after using the new material is analyzed.

scholarly journals Design of Center Pillar with Composite Reinforcements Using Hybrid Molding Method

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2047
Author(s):  
Ji-Heon Kang ◽  
Jae-Wook Lee ◽  
Jae-Hong Kim ◽  
Tae-Min Ahn ◽  
Dae-Cheol Ko
Keyword(s):  
Composite Materials ◽  
Weight Reduction ◽  
Fuel Efficiency ◽  
Vehicle Body ◽  
Process Time ◽  
Fiber Reinforced ◽  
Fiber Reinforced Plastic ◽  
Molding Method ◽  
Reinforced Plastic ◽  
Composite Reinforcements

Recently, with the increase in awareness about a clean environment worldwide, fuel efficiency standards are being strengthened in accordance with exhaust gas regulations. In the automotive industry, various studies are ongoing on vehicle body weight reduction to improve fuel efficiency. This study aims to reduce vehicle weight by replacing the existing steel reinforcements in an automobile center pillar with a composite reinforcement. Composite materials are suitable for weight reduction because of their higher specific strength and stiffness compared to existing steel materials; however, one of the disadvantages is their high material cost. Therefore, a hybrid molding method that simultaneously performs compression and injection was proposed to reduce both process time and production cost. To replace existing steel reinforcements with composite materials, various reinforcement shapes were designed using a carbon fiber-reinforced plastic patch and glass fiber-reinforced plastic ribs. Structural analyses confirmed that, using these composite reinforcements, the same or a higher specific stiffness was achieved compared to the that of an existing center pillar using steel reinforcements. The composite reinforcements resulted in a 67.37% weight reduction compared to the steel reinforcements. In addition, a hybrid mold was designed and manufactured to implement the hybrid process.

scholarly journals Vibroacoustic Assessment of an Innovative Composite Material for the Roof of a Coupe Car

2021 ◽  
Vol 11 (3) ◽  
pp. 1128
Author(s):  
Nunziante Cascone ◽  
Luca Caivano ◽  
Giuseppe D’Errico ◽  
Roberto Citarella
Keyword(s):  
Composite Material ◽  
Transfer Functions ◽  
Realistic Model ◽  
Point Of View ◽  
Damping Capacity ◽  
Geometry Structure ◽  
Fiberglass Composite ◽  
New Material ◽  
Static Rigidity ◽  
Innovative Material

The objective of this paper is the vibroacoustic evaluation of an innovative material for a sports car roof, aiming at replacing fiberglass composite materials. Such evaluation was carried out using numerical and experimental analysis techniques, with cross-comparison between the corresponding results. The innovative material under analysis is a composite material, with a thermoplastic polypropylene matrix and reinforcement made of cellulose fibers. In order to validate the virtual dynamic modeling of the new material, the inertance on different points of some sheets made of the material under analysis was evaluated by an in-house made experimental activity, performed in the CRF (Fiat Research Center) test room, and cross-compared with corresponding results from a numerical analysis performed with the MSC Nastran software. Then, a realistic model of the car roof of the Alfa Romeo 4C car, made with the new material, was implemented and analyzed from the vibroacoustic point of view. The mere switch to the new material, with no changes in the geometry/structure of the car roof, did not allow preserving the original values of static rigidity, dynamic rigidity, and configuration of modal shapes. For this reason, a geometric/structural optimization of the component was performed. Once the new geometry/structure was defined, a vibroacoustic analysis was carried out, checking for a possible coupling between the fluid cavity modes and the structure car body modes. Finally, the vibroacoustic transfer functions to the driver’s ear node were assessed, considering two different excitation points on the structure. The excellent damping capacity of the proposed material led to an improvement in the vibroacoustic transfer functions and to a reduction in the weight of the pavilion.

IN-SITU MEASUREMENT OF PERMEABILITY BETWEEN CARBON FIBER/RESIN

2021 ◽  
Author(s):  
MASAKI ENDO ◽  
HIROSHI SAITO ◽  
ISAO KIMPARA
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Capital Investment ◽  
High Strength ◽  
Carbon Fiber Reinforced Plastic ◽  
Manufacturing Costs ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic

Carbon fiber reinforced plastic (CFRP) is a composite material in which carbon fibers are impregnated with resin to achieve both high strength and high rigidity. CFRP is an excellent material, but it is expensive in terms of materials, manufacturing costs, and capital investment, and it takes a lot of time to complete a product. In order to solve these problems, the demand for de-autoclaving has been increasing in recent years. If molding can be performed without autoclaving, it will be possible to reduce costs and improve productivity in terms of materials and capital investment costs.

scholarly journals The DESIGN OF FIBER METAL LAMINATE AS A BODY MATERIAL WITH CARBON FIBER METHOD

2021 ◽  
Vol 2 (Oktober) ◽  
pp. 50-56
Author(s):  
Muhammad Juliansyah Winarto ◽  
Lalu Saefullah ◽  
Willem Loe Mau
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
The Body ◽  
Vehicle Body ◽  
Vehicle Engine ◽  
Steel Material ◽  
Fiber Metal Laminate ◽  
Combat Vehicle ◽  
Fiber Metal ◽  
Armored Vehicle

The combat vehicles that Indonesia Army belong to most of the materials are steel, for example the armored vehicle anoa 6x6. Steel material is used as a fire protection on the vehicle, it will greatly affect the performance of the vehicle. It is caused the steel material has a high density, which is around 7750 kg/m3to 8050 kg/m3. So, with a large enough volume of the vehicle body, it will increase the burden of the vehicle. As well as the engine load will increase, and more power is needed to be able to move the vehicle. Seeing these problems, it is necessary to have a research or study on alternative materials to replace the body of a combat vehicle that can withstand fire from opposing weapons that cause personnel to be injured. In this study, experimental and simulation methods were used using the ansys application to analyze the strength of the composite material in the form of an aluminum layer that had been treated to increase the hardness value. Furthermore, it is coated with a composite material using a carbon fiber matrix of epoxy, HGM and polyurethane. The coating material is called Fiber Metal Laminate (FML), so the material used has a lighter density, the load received by the vehicle engine is lighter, and the performance of the vehicle will be more effective and efficient.

Discrete sizing, cross-sectional shape, topology optimization, and material selection of a framed automotive body

2021 ◽  
pp. 095440702110626
Author(s):  
Chao Ma
Keyword(s):  
Weight Reduction ◽  
Material Selection ◽  
Extreme Points ◽  
Optimization Method ◽  
Test Problems ◽  
Manufacturing Cost ◽  
Cross Sectional ◽  
Automotive Body ◽  
Discrete Design Variables ◽  
Sectional Shape

This study proposed a discrete structural optimization method for a framed automotive body. Up to four types of discrete design variables are considered simultaneously, that is, the sizing, cross-sectional shape, topology, and material variables. Firstly, to solve the nonconvex and nonlinear optimization problem, the original non-dominated sorting genetic algorithm, the third version (NSGA-III), is adapted. An improved extreme points identification scheme and a new mutation operator are proposed to stabilize the normalization of the population and accommodate the manufacturing constraints, respectively. Two test problems demonstrate that the modified NSGA-III can handle continuous and discontinuous multiple objective optimization. Subsequently, the classical 10-bar truss is used to illustrate the proposed method. A weight reduction of 4.5 kg is achieved as compared to previous optimal designs in the literature. Finally, a framed automotive body is optimized for maximizing the first order natural frequency and minimizing the total mass, the maximum stresses and the maximum displacements in different load cases and the manufacturing cost. The results obtained by different optimization procedures are presented and discussed. The results demonstrate the feasibility and effectiveness of the proposed method. A weight reduction of 17.59% is achieved while other structural performances satisfy the design requirements.

Material Selection Considerations for Lightweight Automotive Bodies

2021 ◽  
pp. 175-192
Author(s):  
Herman Tang
Keyword(s):  
Influencing Factors ◽  
Weight Reduction ◽  
Material Selection ◽  
Government Regulations ◽  
Vehicle Development ◽  
Reduction Potentials ◽  
Technology Applications ◽  
Light Weighting ◽  
Joining Process ◽  
Vehicle Bodies

Lightweight is a trend of new vehicle development, driven by government regulations, environmental concerns, and customer needs. A major effort in the automotive industry is on light weighting vehicle bodies. This chapter reviews the various materials, their characteristics, weight reduction potentials, and costs for light weighting vehicle bodies. The chapter also exams the joining technologies on their principles, applications for the lightweight materials, and influencing factors for choosing a joining process. Furthermore, this chapter discusses the development trends of material selection and joining technology applications.

Examination of Microstructure of Cement Composite Material for Renovation of Horizontal Structures

2019 ◽  
Vol 808 ◽  
pp. 103-108
Author(s):  
Lenka Mészárosová ◽  
Vít Černý ◽  
Rostislav Drochytka ◽  
Winfried Malorny
Keyword(s):  
Thermal Conductivity ◽  
Composite Material ◽  
High Temperature ◽  
Surface Temperature ◽  
Cement Composite ◽  
Volume Weight ◽  
Coefficient Of Thermal Conductivity ◽  
New Material ◽  
Properties Of Materials ◽  
Low Volume

Development of new material is focused on modification of properties of materials with silicate binder so that these could be used for renovation of horizontal structures of high-temperature devices and at the same time contribute to reduction of heat transportation of constructions with higher surface temperature (in this case 200 and 500 °C). Main requirements for this material is low volume weight and low coefficient of thermal conductivity. This paper assesses influence of exposition to higher temperatures on microstructure.

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