scholarly journals The Hybrid Joints between an FRP Panel and a Steel Panel through Tubular Reinforcements: A Methodology for Interlaminar Stress Calculations

2020 ◽  
Vol 10 (11) ◽  
pp. 3962
Author(s):  
Franklin Domínguez ◽  
Luis Carral
Keyword(s):  
Adhesive Bonding ◽  
Chemical Properties ◽  
Interlaminar Stresses ◽  
Adjacent Layer ◽  
Interlaminar Stress ◽  
Steel Panel ◽  
Frp Composites ◽  
Hybrid Joint ◽  
Reinforced Plastic ◽  
Hybrid Joints

The advantages of laminates in terms of the chemical properties and mechanical properties/weight relationship have motivated several applications of fiber-reinforced plastic (FRP) composites in naval constructions due to the reduction in structural weight. This weight advantage has motivated multiple investigations dedicated to dissimilar material joints. We present a methodology for the interlaminar stress calculations of a tubular hybrid joint between an FRP panel and a steel panel through tubular reinforcements. The proposed formulas allow the estimation of the shear and normal stresses on the adhesive, which are generated in the bonding angle of the tubular hybrid joint. The stresses generated at the adhesive bonding ends influence on the adherent’s adjacent layer. A failure criterion is shown to check the accomplishment of the resulting stresses in the adherent laminate. Finally, the proposed formulas are validated using the finite element method and compared with the obtained interlaminar stresses.

Adhesive Distribution and Global Deformation between Hybrid Joints

2015 ◽  
Vol 651-653 ◽  
pp. 1465-1471 ◽  
Author(s):  
Dirk Landgrebe ◽  
Bernd Mayer ◽  
Stephan Niese ◽  
Holger Fricke ◽  
Ivo Neumann ◽  
...  
Keyword(s):  
Automotive Industry ◽  
High Speed ◽  
Adhesive Bonding ◽  
Measurement Technology ◽  
Detailed Knowledge ◽  
Small Surface ◽  
Mechanical Joining ◽  
Hybrid Joint ◽  
Hybrid Joints ◽  
Joining Process

In multi-material-design, e.g. in the automotive industry, mechanical joining processes like self-pierce riveting are well established, because of their amount of advantages. However, adhesive bonding with one-component structural adhesives is increasingly being used. The combination of the specific advantages of both joining techniques in the form of hybrid joints leads to synergies of quality and reliability, such as high corrosion resistance and better damping properties. A critical issue is the generation of global deformations of the different parts of the mechanical joints. These global deformations of the sheet metal between two or more mechanical connectors (e.g. rivets) are caused by the formation of adhesive bags during the riveting process, before the adhesive curing takes place. This research focuses on the time-dependent formation process of these bags. The aim is to achieve a reduction of global deformations based on detailed knowledge of the adhesive flow during the manufacturing of the joint by means of experiments and simulations. For this purpose experimental techniques and measurement methods for deformations over time are presented for different setups of hybrid joint types of self-piercing rivets in combination with adhesive bonding. The challenge is to track rapid and small surface deformations very accurately in the ongoing mechanical joining process. High-speed optical measurement technology like Point-Tracking and surface scanning are used to track the resulting deformations experimentally. Numerical investigations, which include the interaction of the solid matter influenced in the mechanical joining process and the fluid adhesive, are presented. On the basis a fully coupled fluid-structure interaction simulation of a single hybrid joint, a surrogate model for a multi-point hybrid joint is developed. The comparison of experimental data with simulations allows deriving the pressure distribution and flow velocities inside the adhesive layer. The influence of various parameters can be interpreted based on the physics of the interacting system, ultimately resulting in optimization helpful to the automotive industry.

Fatigue Response of the Hybrid Joints Obtained by Hot Spot Welding and Bonding Techniques

2014 ◽  
Vol 601 ◽  
pp. 25-28 ◽  
Author(s):  
Tomasz Sadowski ◽  
Marcin Kneć ◽  
Przeymysław Golewski
Keyword(s):  
Spot Welding ◽  
Adhesive Bonding ◽  
Hot Spot ◽  
Fatigue Tests ◽  
Image Correlation ◽  
Bonding Layer ◽  
Engineering Structures ◽  
Hybrid Joint ◽  
Hybrid Joints ◽  
Structural Parts

Hybrid joining of structural parts (e.g. [3-1) is relatively new approach to create more safe and reliable connection of the critical part of engineering structures. In this paper we consider hybrid joint consisting of 2 aluminum stripes and an angle bar (e.g. [7]) joined by 2 simple techniques: hot spot welding (HSW) and adhesive bonding (AB). The samples were subjected to fatigue tests in order to find fatigue response at different level of load amplitude. New method of plastic deformation measurement during fatigue was proposed with application of Digital Image Correlation (DIC) method. Numerical analysis of the hybrid joint fatigue response was proposed in the paper taking into account both: gradual degradation of the bonding layer and plastic damage in the aluminium strips due to cyclic loading.

Experimental Response of RC Beams Strengthened in Shear by FRP Sheets

2013 ◽  
Vol 7 (1) ◽  
pp. 127-135 ◽  
Author(s):  
E. Grande ◽  
M. Imbimbo ◽  
A. Rasulo
Keyword(s):  
Slenderness Ratio ◽  
Shear Capacity ◽  
Rc Beams ◽  
Fiber Reinforced Plastic ◽  
Frp Composites ◽  
Reinforced Plastic ◽  
Externally Bonded ◽  
Experimental Response ◽  
Transverse Steel ◽  
Cracking Pattern

The paper discusses the results of an experimental investigation carried out on reinforced concrete (RC) beams strengthened in shear by externally bonded fiber reinforced plastic (FRP) sheets. The study is devoted to analyze the role that the transverse steel reinforcement and the beam slenderness ratio could play on the resistant mechanism of RC beams strengthened in shear by FRP composites. The results are summarized and analyzed in detail in the paper in terms of shear capacity, cracking pattern and shear resisting contribution of FRP.

scholarly journals Investigation of joints from laser powder fusion processed and conventional material grades of 18MAR300 nickel maraging steel

2021 ◽  
Author(s):  
W. Tillmann ◽  
L. Wojarski ◽  
T. Henning
Keyword(s):  
Tensile Strength ◽  
Maraging Steel ◽  
Solid Material ◽  
High Volume ◽  
Heat Treatment Condition ◽  
Hybrid Joint ◽  
Hybrid Joints ◽  
Laser Systems ◽  
Conventional Material ◽  
The Individual

AbstractEven though the buildup rate of laser powder bed fusion processes (LPBF) has steadily increased in recent years by using more and more powerful laser systems, the production of large-volume parts is still extremely cost-intensive. Joining of an additively manufactured complex part to a high-volume part made of conventional material is a promising technology to enhance economics. Today, constructors have to select the most economical joining process with respect to the individual field of application. The aim of this research was to investigate the hybrid joint properties of LBPF and conventionally casted 18MAR300 nickel maraging steel depending on the manufacturing process and the heat treatment condition. Therefore, the microstructure and the strength of the hybrid joints manufactured by LPBF or vacuum brazing were examined and compared to solid material and joints of similar material. It was found that the vacuum-brazed hybrid joints using a 50.8-μm-thick AuNi18 foil provide a high tensile strength of 904 MPa which is sufficient for a broad field of application. Furthermore, the additively manufactured hybrid samples offered with 1998 MPa a tensile strength more than twice as high but showed a considerable impact of buildup failures to the strength in general.

Interlaminar Stresses in Composite Laminates Subjected to Twisting Deformation

2017 ◽  
Vol 84 (10) ◽  
Author(s):  
Johnathan Goodsell ◽  
Bo Peng ◽  
R. Byron Pipes ◽  
Wenbin Yu
Keyword(s):  
Composite Laminates ◽  
Load Transfer ◽  
Interlaminar Stresses ◽  
Thermoelastic Deformation ◽  
Interlaminar Stress ◽  
Bending Deformation ◽  
Axial Extension ◽  
The Cross ◽  
Twisting Deformation

The interlaminar stress in angle-ply and cross-ply composite laminates subjected to twisting deformation are investigated. Two mechanisms of interlaminar load transfer have been developed by studying the angle-ply laminate and the cross-ply laminate subjected to uniform axial extension, thermoelastic deformation and anticlastic bending deformation. In the present, these mechanisms are investigated in laminates subjected to twisting deformation. It is shown that the mechanisms of interlaminar load transfer in twisting deformation are identical to those previously investigated, though they arise from different causes. Furthermore, a unified treatment of the mechanisms of interlaminar load transfer is presented for the angle-ply laminate and the cross-ply laminate subjected to the four aforementioned modes of deformation.

PERFORMANCE ADVANCEMENT OF RC COLUMNS BY APPLYING BASALT FRP COMPOSITES WITH NSM AND CONFINEMENT SYSTEM

2013 ◽  
Vol 07 (02) ◽  
pp. 1350007 ◽  
Author(s):  
LINING DING ◽  
GANG WU ◽  
SHENYIN YANG ◽  
ZHISHEN WU
Keyword(s):  
Performance Enhancement ◽  
Load Capacity ◽  
Basalt Fiber ◽  
Chemical Properties ◽  
Strength Degradation ◽  
Rc Columns ◽  
Near Surface ◽  
Displacement Ductility ◽  
Frp Composites ◽  
Yield Displacement

Basalt fiber reinforced polymer (BFRP) composites are regarded as promising structural strengthening material due to their environmental friendly and superior mechanical and chemical properties. In order to enhance the overall seismic performance of RC columns, a strengthening system is developed by applying BFRP composites with both near surface mounted (NSM) and confinement approaches. The variables taken into account consisted of the diameters and anchorage lengths of BFRP bars, as well as the confinement amounts of BFRP sheets. A total of eight column specimens including one control were tested subjected to simultaneous axial compression and cyclic bend. The structural performance such as load capacity, displacement, ductility, stiffness degradation, energy dissipation capacity, curvature and post-yield stiffness were investigated. The test results indicate that the combination of NSM and confinement techniques contributes to the comprehensive performance enhancement of RC columns, which lies in (1) constantly enlarging diameters of BFRP bars increases the yield and peak loads, the ultimate displacement, the initial and post-yield stiffness as well as the ductility, whereas it has no obvious influence on the yield displacement; (2) longer bonding length results in higher seismic performances although it makes no changes to the yield displacement, the post-yield stiffness, and the degradation of strength and stiffness as well; (3) the adoption of BFRP confinement significantly improves the ductility and the strength degradation performance; (4) the largest post-yield stiffness can be achieved by enlarging diameter to 12 mm, whereas the ductility and the strength degradation characteristics deteriorate due to the weakness of interfacial bonding between BFRP bars and concrete.

scholarly journals A Short Review on 3-d Printing of FRP Composites Using Stereolithography

2021 ◽  
Author(s):  
Girish Dutt Gautam ◽  
◽  
Sunita Rani ◽  
Sudhanshu Raghuwanshi ◽  
Samendra Singh ◽  
...  
Keyword(s):  
Composite Materials ◽  
Chemical Properties ◽  
Short Review ◽  
Product Diversification ◽  
Frp Composites ◽  
Frp Composite ◽  
Reinforced Polymer ◽  
Critical Issues ◽  
Manufacturing Techniques ◽  
Application Specific

A higher product diversification range with excellent physical, mechanical and chemical properties make Fiber-reinforced polymer (FRP) composite materials a prominent candidate for engineering applications. But, conventional manufacturing techniques always face critical issues during the development of FRP's complex and intrinsic profile. In recent years, Additive Manufacturing (AM) or 3-D printing proves itself a robust technique to produce application-specific parts of FRP composites with a higher degree of customization. In comparison to other 3D printing techniques, Stereolithography (SLA) is able to create mechanically stable objects with higher processing speed. This information paves the way for the present review article. This paper reviews the recent advancement of SLA technique to develop objects of FRP composite materials.

Study on Procedure of Bonding-FSSW Hybrid Joints of AZ31 Magnesium Alloy

2011 ◽  
Vol 314-316 ◽  
pp. 953-956 ◽  
Author(s):  
Cheng Gang Ding ◽  
Ya Qi Ni ◽  
Chuan Jun Guo ◽  
Gao Feng Quan ◽  
Ji Ping Ge
Keyword(s):  
Mechanical Property ◽  
Aluminum Alloy ◽  
High Strength ◽  
Bonding Agent ◽  
Nugget Zone ◽  
Hybrid Joint ◽  
Hybrid Joints ◽  
Coarse Grains ◽  
And Performance ◽  
Microstructure And Performance

In this paper a bonding-FSSW hybrid method is proposed and the joining procedure as well as the microstructure and performance of bonding-FSSW hybrid joints of AZ31 aluminum alloy is examined . The results show that the bonding agent has little influence on the forming and mechanical property of FSSW nugget, the shear-resisting property of the hybrid joints with sealing glue is equivalent to FSSW joints, in bonding-FSSW hybrid joint with high-strength bonding agent, the shear-resisting property of joints are apparently superior to that of pure FSSW or bonding joints. Tiny and uniform equiaxial grains are formed in the WN(Welding nugget zone) and coarse grains are formed in TMAZ (Thermomechanically affected zone) and HAZ (Heat affected zone), but with unequal size. The good properties of the hybrid joints are obtained by choosing the optimal joining parameter.

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