The manufacturing process of co-cured single and double lap joints and evaluation of the load-bearing capacities of co-cured joints

2003 ◽  
Vol 138 (1-3) ◽  
pp. 89-96 ◽  
Author(s):  
Kum Cheol Shin ◽  
Jeong Ok Lim ◽  
Jung Ju Lee
Keyword(s):  
Manufacturing Process ◽  
Lap Joints ◽  
Load Bearing

Effect of interface non-flatness on the fatigue behavior of adhesively bonded single lap joints

2017 ◽  
Vol 233 (7) ◽  
pp. 1277-1286 ◽  
Author(s):  
SMJ Razavi ◽  
MR Ayatollahi ◽  
M Samari ◽  
LFM da Silva
Keyword(s):  
Fatigue Life ◽  
Bearing Capacity ◽  
Fatigue Behavior ◽  
Fatigue Loading ◽  
Lap Joints ◽  
Lap Joint ◽  
Adhesively Bonded ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Single Lap Joints

This paper addresses numerical and experimental examination of the role of zigzag interface shapes on the load bearing capacity and fatigue life of adhesively bonded single lap joints. Aluminum adherends with non-flat zigzag interfaces were tested under both quasi-static and fatigue loading conditions. The quasi-static test results revealed that the non-flat adhesive joints have higher load bearing capacity compared to the conventional flat single lap joints. Comparative fatigue tests with different loading levels revealed that the non-flat zigzag single lap joint had considerably higher fatigue life than the conventional lap joint.

Experimental Investigation of Metallic Fiber-Reinforced Adhesively Bonded Joints under Bending

2017 ◽  
Vol 754 ◽  
pp. 252-255
Author(s):  
S.M.J. Razavi ◽  
F. Berto
Keyword(s):  
Adhesive Layer ◽  
Longitudinal Direction ◽  
Lap Joints ◽  
Experimental Investigations ◽  
Adhesively Bonded ◽  
Load Bearing ◽  
Single Lap Joints ◽  
Bonded Joint ◽  
Failure Loads ◽  
Fibers Orientation

In the current paper, the geometric and material parameters of metal fibers utilized for strengthening adhesively bonded single lap joints under flexural loading were investigated by using experimental investigations. According to the test results, incorporating metal fibers in the adhesive layer of a bonded joint can have a significant impact on the flexural load bearing of the joint. The distance between the fibers and also the fibers orientation were considered as the key parameters in this research. It was concluded that the load bearing of the joint can be improved by reducing the distance between the fibers and the highest failure loads were obtained for the joints reinforced by fibers in the longitudinal direction.

Technology of Production of SFRC at Concrete Plants

2014 ◽  
Vol 1000 ◽  
pp. 273-276
Author(s):  
Václav Ráček ◽  
Jan Vodička
Keyword(s):  
Reinforced Concrete ◽  
Manufacturing Process ◽  
Steel Fibre ◽  
Fibre Reinforced Concrete ◽  
Forced Circulation ◽  
Load Bearing ◽  
Steel Fibre Reinforced Concrete ◽  
Fibre Concrete ◽  
Concrete Mixer ◽  
Technology Of Production

Currently, manufacture of steel fibre reinforced concrete (SFRC) takes place in concrete mixer truck for floors mostly of industrial halls. This technology is suitable for low dosages of fibres (about 20kg/m3), which is determined by uncrossable price of deposited concrete (400 – 600 crowns/m2 for the floor in thickness from 150 to 200 mm). Totally realistic premise in future is, that SFRC will be used for load-bearing SFRC structures of aboveground objects. In this case, production of SFRC must take place in concrete plants at higher weight doses than 40 kg/m3 of fibres, to achieve the characteristics of SFRC, which bring effects to SFRC structures. In the paper, there are presented two examples of the production of SFRC in concrete plants. There is specified manufacturing process of production of SFRC in mixers with forced circulation, which is necessary to comply, in order to achieve a homogenous fresh fibre concrete and to minimize wear of machinery.

The Effect of Interface Geometry on the Mechanical Behavior of Adhesive Joints

2017 ◽  
Vol 754 ◽  
pp. 256-259 ◽  
Author(s):  
S.M.J. Razavi ◽  
M. Peron ◽  
J. Torgersen ◽  
F. Berto
Keyword(s):  
Wave Length ◽  
Variable Parameter ◽  
Lap Joints ◽  
Experimental Results ◽  
Adhesively Bonded ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Single Lap Joints ◽  
Wave Heights

The role of sinusoid interface shape on the load bearing capacity of the adhesively bonded single lap joints has been investigated experimentally. The experimental results showed that the interface non-flatness can considerably influence the adhesive joint strength. The main parameters that can affect the load bearing of the non-flat joints are wave heights, wave lengths and also mechanical properties of adhesives and adherends. In this paper, the effect of wave length was evaluated as the key variable parameter. According to the experimental results for the best studied case, non-flat sinusoid single lap joints had about 51% higher load bearing compared to the conventional flat single lap joints.

scholarly journals Experimental investigation on stiffness and strength of single-lap z-pinned joints in a laminated CFRP stress-ribbon strip

2016 ◽  
Vol 11 (2) ◽  
pp. 120-126 ◽  
Author(s):  
Aleksandr K. Arnautov ◽  
Vladimir Kulakov ◽  
Janis Andersons ◽  
Viktor Gribniak ◽  
Algirdas Juozapaitis
Keyword(s):  
Structural Integrity ◽  
Progressive Failure ◽  
Failure Process ◽  
High Strength ◽  
Lap Joints ◽  
Fiber Reinforced Polymers ◽  
Fiber Reinforced ◽  
Reinforced Polymers ◽  
Load Bearing ◽  
Hybrid Joints

Carbon fiber-reinforced polymer (carbon-polymer) is an advanced lightweight composite material with high strength and excellent resistance to corrosion and fatigue. Over the past decades, application of fiber-reinforced polymers has been spread from the aerospace to other branches of industry such as automobile and civil engineering. Unidirectional carbon-polymers have a high potential for replacing steel in tensile members. Recently, the first carbonpolymer stress-ribbon bridge has been constructed in Germany. The non-laminated strip-loop carbon-polymer thin strips were used as the load bearing components in this bridge. In comparison with the laminated components, the applied cables are characterized by a more uniform strain distribution though reduced structural integrity. Alternative jointing technologies of carbon-polymer laminates are considered in this paper with an intention to increase the structural integrity and reliability of the production. Tensile behavior of the single-lap joints was investigated experimentally. Three types of the joints were considered. Adhesive joint was set as the reference. The overlap region of the mechanically fastened joints was produced using 9, 25, or 36 steel needles (z-pins) of 1 mm diameter. The proposed hybrid joints were additionally connected with adhesive increasing the load-bearing capacity of the reference joint up to 230%. Concerning the brittle fracture of the adhesive counterparts, the extended progressive failure process within the hybrid joints is responsible for the improvement.

Fracture Mechanics Characterization of Composite/Metal Interfaces of Bonded Joints

2007 ◽  
Vol 334-335 ◽  
pp. 361-364
Author(s):  
Won Seok Kim ◽  
Jung Ju Lee
Keyword(s):  
Adhesive Bonding ◽  
Load Condition ◽  
Tensile Load ◽  
Structural Features ◽  
Lap Joints ◽  
Bonded Joints ◽  
Singular Stress ◽  
Engineering Structures ◽  
Load Bearing ◽  
Adhesive Bonded Joints

Adhesive bonding between different materials has been widely used for a large variety of applications, such as in the aircraft, automotive, and many other civil engineering structures. Adhesive-bonded joints as load bearing components have the potential to save significant weight and cost over conventional riveted or bolted joints. For the last ten years a major problem in adhesive technology has been the difficulty in predicting the accurate load bearing capacity of a joint. This difficulty comes from the fact that the stress distribution in the adhesive joint is very complex and singular stress field exists at the bi-material corner. And for bonded joints, the failure usually occurs at the adhesive/adherend interface. Therefore another difficulty comes from the complex interfacial failure analysis due to the formation of chemical bonds, whose strengths are difficult to measure. Many studies have been conducted to investigate the effects of bond thickness, material properties of adhesives and adherends, and geometric shape of bi-material corner tip to the fracture behavior of bonded joints. In this paper, we analyze the stress fields at the interface corner of composite/steel(anisotropic/isotropic) double lap joint to predict failure by using stress intensity based fracture criterion. And analytical results are compared with experimental results of co-cured lap joints under tensile load condition. Micro-structural features, hardness characteristics, and fracture toughness determinations of the interfaces are also conducted.

Towards efficiency in constructive timber engineering - design and optimization of timber trusses

2019 ◽  
Author(s):  
Benjamin Kromoser ◽  
Matthias Braun
Keyword(s):  
Manufacturing Process ◽  
Research Approach ◽  
Robot Arm ◽  
Utilization Factor ◽  
Load Bearing ◽  
Design And Optimization ◽  
Plate Girders ◽  
Load Tests ◽  
Material Utilization ◽  
Timber Engineering

<p>Currently, laminated timber is widely used. The gluing allows for higher part length and involves an advantageous behavior regarding deformations due to shrinkage and lead to better, more regular mechanical properties. The drawback is a low material utilization factor. Starting from a tree trunk, only 25-30 % are part of the final product. Thus, the high-quality product has to be used as efficient as possible.</p><p>At moment mostly, plate girders made of laminated timber are used as a result of the efficient industrialized manufacturing process. If in comparison a truss system is used, a similar load bearing capacity and stiffness can be achieved with much less material effort. The aim of the authors is to industrialize the design and manufacturing process of timber truss systems to be able to compete with the common plate girder systems. The complete process starting from the design, static optimization, work preparation to production process will be cumulated in a continuous digital approach. The paper describes the research approach and experiments about the digital production (by use of a robot arm) and load bearing behavior of different wood- wood connections as first development step. In addition, the design of 1:1 load tests at different timber trusses as well as comparable plate girders is presented.</p>

Interfacial Fracture Analysis of Adhesive-Bonded Joints

2008 ◽  
Vol 33-37 ◽  
pp. 327-332 ◽  
Author(s):  
Won Seock Kim ◽  
Jung Ju Lee
Keyword(s):  
Fracture Toughness ◽  
Fracture Mechanics ◽  
Adhesion Strength ◽  
Interfacial Fracture ◽  
Lap Joints ◽  
Bonded Joints ◽  
Load Bearing ◽  
Interfacial Fracture Mechanics ◽  
Adhesive Bonded Joints ◽  
Composite Steel

The failure in an adhesive-bonded structure starts at the interface, and the interfacial fracture is of interest whenever adhesion between different materials is concerned. One of primary factors limiting the application of adhesive-bonded joints to structural design is the lack of a good evaluation tool for adhesion strength to predict the load-bearing capacity of boned joints. The adhesion strength of composite/steel bonding has been evaluated using interfacial fracture mechanics characterization. The energy release rate of a composite/steel interfacial crack was compared with the fracture toughness of the interface, which was measured from bi-material end notched flexure (ENF) specimens, to predict the failure loads of bi-material lap joints. Fracture toughness, IIc G , was regarded as a property of the interface rather than a property of the adhesive. The results show that interfacial fracture mechanics characterization of adhesion strength can be a practical engineering tool for predicting the load-bearing capacities of adhesive-bonded joints.

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