The wedge splitting test, a new method of performing stable fracture mechanics tests

Brühwiler, E.; Wittmann, Folker H.

doi:10.1016/0013-7944(90)90189-n

Cited by 245 publications

(116 citation statements)

References 5 publications

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“…Matrix Young's modulus E m was determined from the initial slope of the tensile stress-strain curve and the matrix tensile strength σ m was deduced based on a wedge splitting test. The wedge splitting test (Bruehwiler and Wittmann 1990) measured the matrix fracture energy and σ m was calculated by means of inverse analysis (Ostergaard 2003;Ostergaard et al 2004). Factor k can be calibrated by measuring the spalling size.…”

Section: Determination Of Micromechanics Parametersmentioning

confidence: 99%

Fiber-Bridging Constitutive Law of Engineered Cementitious Composites

Yang

Wang

Yao

et al. 2008

ACT

367

133

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This paper is on modeling and measuring fiber-bridging constitutive law of Engineered Cementitious Composites (ECC), a high performance fiber-reinforced cementitious composite featuring high tensile ductility. Fiber-bridging constitutive law plays an important role in the multiple cracking behavior of ECC. Therefore, proper control of fiberbridging behavior through tailoring material microstructure is the key to successfully designing tensile strain-hardening ECC. In this paper, an analytical fiber-bridging model of ECC which connects material constituent parameters and composite properties, built on a previous simplified version, was proposed. To improve accuracy of crack opening prediction, new mechanisms of fiber/matrix interactions, specifically fiber two-way debonding and pull-out, matrix microspalling, and Cook-Gordon effects were included. This revised model was compared with experimental measurement of fiber-bridging behavior and the validity of the model was confirmed. It is expected that this model will greatly improve ECC design technology in terms of steady-state crack width control, key for structural long-term durability, and in terms of composite tensile properties important for structural safety at ultimate limit state.

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Section: Determination Of Micromechanics Parametersmentioning

confidence: 99%

Fiber-Bridging Constitutive Law of Engineered Cementitious Composites

Yang

Wang

Yao

et al. 2008

ACT

367

133

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“…However, many of the fracture tests proposed by the previous researchers are not able to cover all mixed mode conditions. One can find several fracture test specimens in the literature such as compact tension (CT) specimen (Wagoner et al 2005, Kim et al 2014, wedge splitting (WS) test (Brühwiler et al, 1990;Issa et al, 2003), three point bend (3PB) specimen (Korte et al, 2014;Seitl et al, 2017;, four point bend (4PB) specimen (Munz et al, 1980;Razavi et al, 2017;Fakhri et al, 2017;Ayatollahi & Aliha 2011) , Brazilian disk (BD) specimen Wei et al, 2015;Akbardoost et al, 2014;Ayatollahi & Aliha, 2009a), semicircular bend (SCB) specimen (Funatsu et al, 2014;Wei et al, 2017ab;Ameri et al, 2012Ameri et al, , 2016Aliha & Fattahi Amirdehi, 2017), center cracked or notched ring specimen (Dehghany et al, 2017;, triangular bend (ECT) specimen , edge notch disc bend (ENDB) specimen (Bahmani et al, 2017;Tutluoglu & Keles, 2011;Aliha et al, 2015Aliha et al, , 2016, Diagonally loaded square plate (DLSP) specimen (Ayatollahi & Aliha, 2009b), and double cantilever beam (DCB) specimen (Ranade et al, 2014;Lopes et al, 2016). Fig.…”

Section: Fracture Criteria For Bonded Structuresmentioning

confidence: 99%

Factors influencing stresses and movements in continuously reinforced concrete pavements – A review

Mirsayar¹,

Zollinger²

2018

10.5267/j.esm

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The use of cement concrete as a stronger and more durable material than asphalt concrete in construction of the pavements has been increased during the past decades. This review paper investigates the effect of various input variables for the design of continuously reinforced concrete pavements. A literature review is prepared based on the efforts performed by many researchers to investigate the effect of different factors including temperature change, shrinkage, material properties of the concrete, and concrete slab/ subbase bond properties on the displacements and stresses in the concrete slab. It is found that the important role of concrete slab/ subbase bond strength has not been investigated properly as compared to other input variables.

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“…Esquema general del ensayo de la cuña Figure 5. Brühwiler y Wittmann (2003), también ha sido utilizado para caracterizar la tenacidad de los HRF. Durante este ensayo, una cuña va cargando progresivamente un cubo de HRF, previamente entallado, como se muestra esquemáticamente en la Figura 5.…”

Section: Sergio Carmona Malatesta Antonio Aguado De Cea Climent Mounclassified

“…Finally, the test of the wedge or Wedge -Splitting Test (WST), proposed by Linsbauer and Tschegg (1986) and later developed by Brühwiler and Wittmann (2003), has also been used to characterize the strength of the FRC. During this test, a wedge is progressively loading a FRC specimen as it is schematically shown in Figure 5.…”

Section: Sergio Carmona Malatesta Antonio Aguado De Cea Climent Momentioning

confidence: 99%

Control de la tenacidad de los hormigones reforzados con fibras usando el ensayo de doble punzonamiento (ensayo barcelona)

Malatesta

Borrell

et al. 2009

Rev. ing. constr.

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ResumenTradicionalmente, se utiliza el ensayo de vigas prismáticas sometidas a flexión para caracterizar la resistencia y el comportamiento en el régimen post fisuración del hormigón reforzado con fibras (HRF). Sin embargo, estos ensayos presentan una alta dispersión en sus resultados cuestionando su empleo para el control sistemático del HRF en obras; tienen, además el inconveniente de tratarse de ensayos complejos que requieren de probetas pesadas y de personal de laboratorio altamente calificado. Alternativamente, se ha propuesto el uso de otros ensayos normalizados de tracción directa e indirecta para realizar la caracterización de propiedades de los HRF, pero éstos han resultado ser muy complejos de ejecutar, sin obtener grandes mejoras en relación a la alta dispersión de los resultados. Con la finalidad de solucionar esta serie de inconvenientes, se ha propuesto el uso de un ensayo de tracción indirecta basado en una configuración del ensayo de doble punzonamiento, al que se ha denominado "Ensayo Barcelona". Este ensayo requiere de probetas de pequeñas dimensiones, con una alta superficie específica de fractura, permitiendo obtener valores representativos de la resistencia y de la tenacidad del material, con un coeficiente de variación de los resultados inferior al 13%, valor que es considerablemente menor a los alcanzados con otras metodologías experimentales. En este artículo se presentan los resultados de diferentes campañas experimentales, que permiten validar el uso del ensayo Barcelona como una metodología experimental adecuada para la sistemática caracterización del HRF en obras.Palabras Clave: Hormigón reforzado con fibras, tenacidad de HRF, ensayo Barcelona, ensayo de doble punzonamiento, control de HRF Abstract Traditionally, flexural testing of prismatic beams is used to characterize the strength and behavior in post -cracking regime of fiber -reinforced concretes (FRC). These tests exhibit a high dispersion in their results, and therefore invalidate the use of such tests for the systematic control of FRCs works. Also, they have the disadvantage of being complex tests, which require heavy specimens and highly qualified staff . The use of other standard tests of direct and indirect tensile strength has also been intended, which have proved very complex to implement and also have high dispersion. Aiming to solve this set of problems, an indirect tensile test based on the configuration of double punching test, called the Barcelona test, has been proposed to control tensile behavior of FRC. This test requires smaller specimens, with a high specific surface of fracture, allowing to obtain values representative of strength and toughness of materials, with considerably less dispersion than other experimental methodologies. This paper presents the results of different experimental campaigns, which validate the use of Barcelona test as a suitable methodology to systematic characterization FRC in works.Keywords: Fiber reinforced concrete, Toughness of FRC, Barcelona test, Double -punching test, FRC contro...

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The wedge splitting test, a new method of performing stable fracture mechanics tests

Cited by 245 publications

References 5 publications

Fiber-Bridging Constitutive Law of Engineered Cementitious Composites

Fiber-Bridging Constitutive Law of Engineered Cementitious Composites

Factors influencing stresses and movements in continuously reinforced concrete pavements – A review

Control de la tenacidad de los hormigones reforzados con fibras usando el ensayo de doble punzonamiento (ensayo barcelona)

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