Analytical evaluation of pull-out tests—The inverse problem

Banholzer, B.; Brameshuber, Wolfgang; Jung, Wolf

doi:10.1016/j.cemconcomp.2006.02.015

Cited by 56 publications

(27 citation statements)

References 7 publications

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“…While practical adhesion is the total energy needed to separate the interface, including the elastic energy needed to create new surfaces and the energy dissipated in the plastic deformation or other sources. [9][10][11] In the past, a number of techniques such as four-point bending (4PB), [12][13][14][15] scratch, 16 indentation, [17][18][19] and pull-off tests 20,21 were developed based on the practical adhesion definition and applied to different coating/ substrate systems. Those methods usually evaluate the adhesion strength of the coating with the critical force or energy release rate (also named as crack driving force) needed to induce the interfacial crack.…”

Section: Introductionmentioning

confidence: 99%

Interfacial adhesion measurement of a ceramic coating on metal substrate

Nie

Zhou

et al. 2009

J Coat Technol Res

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The interfacial adhesion measurement of a ceramic coating on a metal substrate is studied by three-point bending (3PB) technique. In the measurement, interfacial cracks are induced during the 3PB test, and the interfacial energy release rate is calculated from the released energy per unit crack surface area during crack extension under the fixed displacement conditions. A finite element analysis (FEA) model encompassing the plastic behavior of the metal substrate is developed to simulate the 3PB test and extract the energy data. The inputs to the FEA model include the crack length, the maximum and critical loads corresponding to crack initiation, and the mechanical properties of the coating and substrate. A MoB/CoCr ceramic coating/stainless steel substrate system is investigated by the technique for demonstrating the utility of the technique.

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Section: Introductionmentioning

confidence: 99%

Interfacial adhesion measurement of a ceramic coating on metal substrate

Nie

Zhou

et al. 2009

J Coat Technol Res

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“…In the past, a number of techniques such as bending test, [9 -12] scratch, [13] indentation [14 -16] and pull-off tests [17,18] were developed and applied to different coating/substrate systems. [19] Bending methods have the advantage that the specimen geometry and test technique are simple.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and interfacial adhesion of high velocity oxy‐fuel‐sprayed MoB–CoCr alloy coating on 316L stainless steel

Nie

Yan

et al. 2009

Surface & Interface Analysis

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In this article, a newly developed MoB-CoCr alloy coating was deposited on 316L stainless steel substrate by high velocity oxy-fuel thermal spraying process. The microstructures and interfacial adhesion of the alloy coating were determined by scanning electron microscopy, X-ray diffraction and three-point bending. The results show that the coating consisted of ternary transition metal boride matrix phases (CoMo 2 B 2 , CoMoB) and a little amount of binary borides (MoB and CrB), the former composed of partially amorphous phase. The formation of the amorphous phase was attributed to the high cooling rates of molten droplets and the proper powder compositions. In the interfacial adhesion measurement, the delamination of the coating is induced during the three-point bending test, and the interfacial fracture toughness is analyzed using a finite element analysis model. The critical load is determined by comparing the load versus deflection curves obtained by finite element analysis under assumed no crack conditions with the experimental data, and other inputs are determined by test.

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“…For example, Aljewifi et al [52] investigated the pullout behaviour of single glass multifilament yarns embedded in a fine-grained cementitious matrix. Banholzer et al [53,54] modelled the bond-slip relationship on the basis of onesided single yarn pullout tests. In these tests, a pullout force is applied on the free end of a single yarn embedded in a concrete matrix while measuring resulting displacement.…”

Section: Literature Reviewmentioning

confidence: 99%

Efficient Adaptive Test Method for Textile Development Length in TRC

Ortlepp

2018

Advances in Civil Engineering

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Natural resources can be conserved if we carefully maintain the building stock and indeed extend the useful economic life of buildings. One way to achieve this is to enhance load-bearing structures by repair, restoration, or strengthening. Such upgrading often involves applying a strengthening to existing concrete elements. Over the past decade, textile-reinforced concrete (TRC), encompassing a combination of fine-grained concrete and noncorrosive multiaxial textile fabrics, has emerged as a promising novel alternative for strengthening of conventional steel-reinforced concrete (RC) structures, offering enhanced load-bearing capacity with minimal weight and stiffness change. Although TRC has been extensively researched during the last two decades, the formalization of experimental methods and design standards is still in progress. Attempts to design for good load transfer are often hindered by lack of knowledge regarding bond behaviour. For instance, there are neither standard recommendations nor proofs regarding the required development length of textile fibres in TRC for practical applications up to now. e aim of this work was to provide a test specification, which gives a direct result for the development length (required for the anchorage of a reinforcement, also referred to as "anchorage length") of textile reinforcements in fine-grained concrete-quickly and easily. e aim of this paper was to present the test specification developed in a way that it is useful for the future work of other researchers as well as for construction engineers. Some selected experimental investigations with different textile reinforcements and different bonding properties were performed with the aim of showing the applicability of the proposed adaptive test specification. e results of these tests indicated that conventional AR glass and carbon fabrics without coating required large anchoring lengths. e tests further showed that an additional application of different kinds of coating to textile fabrics greatly increased the reinforcement's resistance to pullout. is is of special interest for carbon fibres, which have a substantially higher strength than AR glass fibres and different bond behaviour; that is, carbon fibres have, by nature, larger development lengths.

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Analytical evaluation of pull-out tests—The inverse problem

Cited by 56 publications

References 7 publications

Interfacial adhesion measurement of a ceramic coating on metal substrate

Interfacial adhesion measurement of a ceramic coating on metal substrate

Microstructure and interfacial adhesion of high velocity oxy‐fuel‐sprayed MoB–CoCr alloy coating on 316L stainless steel

Efficient Adaptive Test Method for Textile Development Length in TRC

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