A comparison of the bond behavior of PBO-FRCM composites determined by double-lap and single-lap shear tests

2015 ◽  
Vol 64 ◽  
pp. 37-48 ◽  
Author(s):  
L.H. Sneed ◽  
T. D'Antino ◽  
C. Carloni ◽  
C. Pellegrino
Keyword(s):  
Shear Tests ◽  
Bond Behavior ◽  
Lap Shear

Adhesion between SRP and Masonry: Influence of Moist Condition of Specimens and Presence of Salts in the Substrate

2019 ◽  
Vol 817 ◽  
pp. 182-188 ◽  
Author(s):  
Yu Yuan ◽  
Cristina Gentilini ◽  
Christian Carloni ◽  
Elisa Franzoni
Keyword(s):  
Ion Chromatography ◽  
Weak Link ◽  
New Technology ◽  
Shear Tests ◽  
Artificial Weathering ◽  
Bond Behavior ◽  
Lap Shear ◽  
Reinforced Polymer ◽  
Moist Condition

In recent years, steel reinforced polymer (SRP) composites have emerged as a new technology for structural strengthening, and several researches have validated the effectiveness of SRP for masonry strengthening. Research has been carried out to study the bond behavior of SRP composites applied to a masonry substrate. However, how the moist and salt on masonry surface will affect bond, which is the weak link in real strengthening applications, is little known yet. This study aims at investigating the bond behavior of SRP composites applied to moist and salt-laden masonry blocks that were subjected to an artificial weathering protocol. Single-lap shear tests were conducted to determine the bond behavior, while ion chromatography provided the salts distribution of weathered specimens to interpret some results of the shear tests.

scholarly journals Clinching of Thermoplastic Composites and Metals—A Comparison of Three Novel Joining Technologies

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2286
Author(s):  
Benjamin Gröger ◽  
Juliane Troschitz ◽  
Julian Vorderbrüggen ◽  
Christian Vogel ◽  
Robert Kupfer ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Composite Material ◽  
Process Design ◽  
Failure Mechanisms ◽  
Thermoplastic Composites ◽  
Material Structure ◽  
Shear Tests ◽  
Load Bearing ◽  
Lap Shear ◽  
Resultant Material

Clinching continuous fibre reinforced thermoplastic composites and metals is challenging due to the low ductility of the composite material. Therefore, a number of novel clinching technologies has been developed specifically for these material combinations. A systematic overview of these advanced clinching methods is given in the present paper. With a focus on process design, three selected clinching methods suitable for different joining tasks are described in detail. The clinching processes including equipment and tools, observed process phenomena and the resultant material structure are compared. Process phenomena during joining are explained in general and compared using computed tomography and micrograph images for each process. In addition the load bearing behaviour and the corresponding failure mechanisms are investigated by means of single-lap shear tests. Finally, the new joining technologies are discussed regarding application relevant criteria.

scholarly journals Experimental and Numerical Investigation on the Steel Reinforced Grout (SRG) Composite-to-Concrete Bond

2020 ◽  
Vol 4 (4) ◽  
pp. 182
Author(s):  
Luciano Ombres ◽  
Salvatore Verre
Keyword(s):  
Bond Length ◽  
Failure Modes ◽  
Peak Load ◽  
Element Model ◽  
Test Results ◽  
Shear Tests ◽  
Bond Slip ◽  
Bond Behavior ◽  
Direct Shear Tests ◽  
Inorganic Matrix

In the paper, the bond between a composite strengthening system consisting of steel textiles embedded into an inorganic matrix (steel reinforced grout, SRG) and the concrete substrate, is investigated. An experimental investigation was carried out on medium density SRG specimens; direct shear tests were conducted on 20 specimens to analyze the effect of the bond length, and the age of the composite strip on the SRG-to-concrete bond behavior. In particular, the tests were conducted considering five bond length (100, 200, 250, 330, and 450 mm), and the composite strip’s age 14th, 21st, and 28th day after the bonding. Test results in the form of peak load, failure modes and, bond-slip diagrams were presented and discussed. A finite element model developed through commercial software to replicate the behavior of SRG strips, is also proposed. The effectiveness of the proposed numerical model was validated by the comparison between its predictions and experimental results.

Heterogeneous FE model for single lap shear tests on FRP reinforced masonry curved pillars with spike anchors

2020 ◽  
Vol 258 ◽  
pp. 119629 ◽  
Author(s):  
Elisa Bertolesi ◽  
Gabriele Milani ◽  
Mario Fagone ◽  
Tommaso Rotunno ◽  
Ernesto Grande
Keyword(s):  
Fe Model ◽  
Shear Tests ◽  
Lap Shear ◽  
Reinforced Masonry

Welding of Aluminum to DP600 Steel Plates by Refill Friction Stir Spot Welding Process (Refill FSSW): Preliminary Results

2014 ◽  
Vol 1082 ◽  
pp. 123-132 ◽  
Author(s):  
Roger Navarro Verastegui ◽  
José Antonio Esmerio Mazzaferro ◽  
Cíntia Cristiane Petry Mazzaferro ◽  
Telmo Roberto Strohaecker ◽  
Jorge Fernandez Dos Santos
Keyword(s):  
Spot Welding ◽  
Rotation Speed ◽  
Welding Process ◽  
Steel Plates ◽  
Mechanical Resistance ◽  
Shear Tests ◽  
Friction Stir ◽  
Lap Shear ◽  
Substantial Change ◽  
Tool Rotation

The main objective of the current work was to produce sound Refill FSSW joints between AA6181-T4 aluminum and DP600 steel plates. The steel plates were used in two different surface conditions: with and without galvanized surface layer. The Taguchi statistical method was used to find out the set of parameters indicated to produce joint with higher mechanical resistance. Then, the possibility of joining these dissimilar metals using the Refill FSSW process was verified. Tool rotation speed and welding time were varied to observe its effect over the joint behavior. The results of lap shear tests showed that galvanized layers do not cause any substantial change on the final joint mechanical resistance, even though different joining mechanisms had been observed.

Adhesion of CPO onto high modulus TPO: Lap-shear tests in conjunction with microscopy studies of the fracture surface structure

Polymer ◽  
2005 ◽  
Vol 46 (25) ◽  
pp. 11610-11623 ◽  
Author(s):  
Zhihui Yin ◽  
Yuechun Ma ◽  
Warner Chen ◽  
Neil Coombs ◽  
Mitchell A. Winnik ◽  
...  
Keyword(s):  
Fracture Surface ◽  
Surface Structure ◽  
High Modulus ◽  
Shear Tests ◽  
Lap Shear

Bond Behavior between Tuff and Fired-Clay Brick Masonry Blocks and SRG Composites

2019 ◽  
Vol 817 ◽  
pp. 118-125
Author(s):  
Giulia Baietti ◽  
Elisa Franzoni ◽  
Giovanni Quartarone ◽  
Alberto Fregni ◽  
Christian Carloni
Keyword(s):  
Salt Crystallization ◽  
Clay Brick ◽  
Shear Tests ◽  
Composite Matrix ◽  
Bond Behavior ◽  
Direct Shear Tests ◽  
Clay Bricks ◽  
Historical Structures ◽  
Salt Distribution ◽  
Masonry Units

This paper presents the results of single-lap direct shear tests on steel reinforced grout (SRG) strips bonded to fired-clay brick and tuff masonry blocks. For this experimental campaign, fifteen masonry blocks were constructed and reinforced with SRG composite strips. Fired-clay bricks and tuff blocks herein employed were collected from demolished historical structures in Modena and Naples (Italy), respectively. Eight out of fifteen blocks were subjected to an artificial weathering procedure to induce salt crystallization, and therefore reproduce the degradation conditions that the buildings could be subjected to during their life. Bond behavior of unconditioned strengthened specimens (i.e. SRG-masonry joints) was compared with the behavior of conditioned joints. Salt distribution, open porosity, and water absorption of brick and tuff masonry units as well as of the SRG composite matrix were analyzed to understand if and how the salt crystallization influenced the adhesion between the SRG strip and the block.

DYNAMIC FAILURE OF A SPOT WELD IN LAP–SHEAR TESTS UNDER COMBINED LOADING CONDITIONS

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5527-5532 ◽  
Author(s):  
J. H. SONG ◽  
J. W. HA ◽  
H. HUH ◽  
J. H. LIM ◽  
S. H. PARK
Keyword(s):  
Failure Load ◽  
Spot Weld ◽  
Combined Loading ◽  
Dynamic Failure ◽  
Failure Model ◽  
Dynamic Effects ◽  
Shear Tests ◽  
Loading Rates ◽  
Lap Shear ◽  
Failure Loads

This paper is concerned with the evaluation of the dynamic failure load in the lap-shear tests of a spot weld. Dynamic lap-shear tests of a spot weld in SPRC340R were conducted with different tensile speeds ranging from 5×10-5 m/sec to 5.0 m/sec. Dynamic effects on the failure load of a spot weld are examined based on the experimental data. Experimental results indicate that failure strength increases with increasing loading rates. Finite element analyses of dynamic lap-shear tests were also performed considering the failure of a spot weld. A spot weld is modeled with a beam element and dynamic failure model is utilized in order to describe the failure of a spot weld in the simulation. The failure loads obtained from the analyses are compared to those from the lap-shear tests. The comparison shows that the failure loads obtained from the analyses are close in consistence with those obtained from the experiments.

Interfacial Shear Strength of Thin Polymeric Coatings on Glass

1988 ◽  
Vol 130 ◽  
Author(s):  
J. E. Ritter ◽  
L. Rosenfeld ◽  
M. R. Lin ◽  
T. J. Lardner
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Indentation Test ◽  
Interfacial Shear ◽  
Polymeric Coatings ◽  
Shear Tests ◽  
Glass Substrates ◽  
Lap Shear ◽  
Order Of Magnitude ◽  
Intrinsic Strength

AbstractThe interfacial adhesive shear strengths of epoxy and acrylate coatings on glass substrates were measured by the indentation and lap shear tests. The lap shear strengths were about an order of magnitude less and exhibited considerably more variability than those measured by indentation. It is believed that the lap shear strength is controlled by large processing flaws (pores in this study); whereas, the indentation test measures the “intrinsic” strength of the coating.

Strategies for the Analysis of the Behavior of an Adhesive in Bonded Assemblies

2011 ◽  
Vol 133 (3) ◽  
Author(s):  
Jean Yves Cognard ◽  
Romain Créac’hcadec ◽  
Laurent Sohier
Keyword(s):  
Experimental Data ◽  
Edge Effects ◽  
Nonlinear Behavior ◽  
Bonded Joints ◽  
Stress Singularities ◽  
Tensile Shear ◽  
Adhesively Bonded ◽  
Shear Tests ◽  
Lap Shear ◽  
Initiation And Propagation

Experimental and numerical analyses of the mechanical behavior of bonded joints can be made particularly difficult by the influence of edge effects. Therefore, understanding the stress distribution in an adhesive joint can lead to improvements in adhesively-bonded assemblies. Such an analysis is proposed in the case of usual single lap shear specimens. Stress singularities can contribute to the initiation and propagation of cracks in the adhesive. Thus, in order to obtain reliable experimental data to analyze the nonlinear behavior of an adhesive in an assembly, tests which strongly limit the influence of stress singularities must be proposed. The design and the abilities of such a device for shear tests are presented. Moreover, some experimental results obtained using a modified Arcan fixture, which has been designed to strongly limit edge effects, are presented in the case of monotonic and complex history loadings. Furthermore, a 2D non associated elasto-visco-plastic model is proposed to accurately describe the experimental behavior under tensile-shear monotonic loadings. An extension of this model is also proposed to represent relaxation type effects under shear loadings.

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