materials free full text inclined fiber pullout from a
High loading-rate pullout behavior of inclined deformed
Single fiber pullout tests enable a deeper understanding of the behavior of fiber reinforced cementitious materials. The vast majority of fiber pullout tests in the literature are quasi-static and conducted with fibers aligned in the loading direction. Studies that focus on dynamic or inclined pull out behavior are not common and those that
Get PriceFiber Pullout and Bond Slip. I Analytical Study Journal
The analysis consists of a primal problem whereby a complete pullout curve is predicted from an assumed bond‐slip relationship and a dual problem in which the bond‐slip relationship is obtained from an experimental pullout curve. The frictional behavior of the interface is also related to and explained by the shrink‐fit and fiber
Get PriceUnderstanding the Toughening Mechanism of Silane Coupling
Interfacial bonding between a fiber and a matrix plays an essential role in composites especially in fiber-reinforced cementitious composites that are superior forms for bearing flexural and tension load in construction applications. Yet despite the importance effective and economic approaches to improve the interfacial bonding between a steel fiber and a cementitious matrix remain
Get PricePredicting the pullout response of inclined straight steel
Nov 14 2009 · Fiber pullout tests have been used for decades to characterize and optimize bond strength on fiber reinforced concretes. However most of the investigations focus on the behavior of fibers aligned with load direction whose pullout mechanisms are not representative of the ones existing in real applications where random orientation of fibers is likely to occur.
Get PriceFiber Pullout and Bond Slip. II Experimental Validation
Very good agreement is observed. The model is also used to derive for the first time bond shear stress versus slip curves typical of fiber‐reinforced concrete and considered a constitutive property of the fiber‐concrete interface.
Get Price(PDF) High loading-rate pullout behavior of inclined
(a) aligned fiber pullout (b) inclined fiber pullout Fig. 1. The typical pullout force versus slip relationships for aligned and inclined S H- and T-fibers during pullout from a cementitious matrix.
Get PriceAnalytical Model for the Pullout Behavior of Straight and
Dec 12 2014 · An interface law is developed for the frictional behavior between the fiber and matrix. In the case of inclined fibers the plastic deformation of the fiber and the local damage of concrete are also considered. For hooked-end fibers the anchorage effect due to the deformed topology of the fiber ends is taken into account in the formulation.
Get PriceFiber strength utilization in carbon/carbon composites
Fiber tensile strength utilization (FSU) is defined as the ratio of apparent fiber strength in the C/C to the fiber strength in an epoxy-resin-matrix composite. Carbonization heat treatment to 1100 °C results in a brittle carbon matrix that bonds strongly with the three lower modulus fibers resulting in matrix-dominated failure at FSU values
Get PriceMaterials Free Full-Text Pullout Behavior of Bundled
In some specimens with fiber inclined angles of 30 45 and 60 degrees and a large embedded fiber length clear rupture of the fiber or peeling of the matrix around the embedded fiber was observed. Pullout load–slip curves showed that the load increases lineally until the maximum load is reached after which it decreases gradually.
Get PricePullout of Inclined Fibers from Cementitious Matrix
Effects of fiber inclination and number of fibers on peak pullout load and corresponding slip were experimentally examined. Based on failure mechanisms experimentally observed a fracture mechanics model was developed to predict pullout resistance of aligned and inclined fibers.
Get PriceA dynamic asymmetrical crack model of bridging fiber pull
Sep 01 2011 · A dynamic asymmetrical crack model of bridging fiber pull-out in unidirectional composite materials A dynamic asymmetrical crack model of bridging fiber pull-out in unidirectional composite materials Li Xin-gang Cheng Yun-hong Lü Nian-chun Hao Guo-dong Cheng Jin 00 00 00 As a rule when a crack happens in composite materials the fibrous system will
Get PricePredicting the pullout response of inclined straight steel
Nov 14 2009 · Fiber pullout tests have been used for decades to characterize and optimize bond strength on fiber reinforced concretes. However most of the investigations focus on the behavior of fibers aligned with load direction whose pullout mechanisms are not representative of the ones existing in real applications where random orientation of fibers is likely to occur.
Get PricePullout behavior of inclined steel fiber in an ultra-high
The fiber inclination angles considered in the pullout tests were 0° 15° 30° 45° and 60°. From the pullout tests it was observed that the largest peak load was obtained at an angle of 30
Get PriceThe Effect of Addition of Fiber Reinforcement on Fire
It is clear that at room temperature the effect of the fiber reinforcement on pullout force in not good since a decrease of 7.1 happens by the addition of fiber to concrete for the age of 5 weeks. At a temperature of 600°C an increase in the pullout force happen to the reinforced concrete with the amount of 18.2 in compare with that for the
Get PriceMultifunctional Textured Surfaces with Enhanced Friction
Oct 19 2016 · Fiber debonding and pullout are well-understood processes that occur during damage and failure events in composite materials. In this study we show how these mechanisms under controlled conditions can be used to produce multifunctional textured surfaces. A two-step process consisting of (1) achieving longitudinal fiber alignment followed by (2) cutting rearranging and joining
Get PriceA Cohesive Interface Model for the Pullout of Inclined
To this aim a new cohesive interface model able to predict effectively the pullout response of inclined fiber is presented in this paper. Based on the nonlinear behavior of steel fibers and cementitious matrixes the proposed approach also takes into account the bond-slip relationship between the materials.
Get Price(PDF) High loading-rate pullout behavior of inclined
(a) aligned fiber pullout (b) inclined fiber pullout Fig. 1. The typical pullout force versus slip relationships for aligned and inclined S H- and T-fibers during pullout from a cementitious matrix.
Get PriceFiber pull-out test and single fiber fragmentation test
material in the same end as the fiber is loadedpull-out Type 2 (PO2). In both cases we denote the (un-deformed) length of the free fiber by . L. f. and the embedded length by . L. A number of micromechanical models exist for the analysis of pull-out and SFFT tests. Several of
Get PriceMaterials Free Full-Text Dynamic Pullout Behavior of
This study examined the influences of fiber geometry inclination angle and loading rate on the pullout behavior of multiple steel fibers in ultra-high-performance concrete (UHPC). For this two different steel fiber types i.e. straight (S-) and hooked (H-) four different inclination angles (0°–60°) and four different loading rates (0.018 mm/s to 1200 mm/s) were considered.
Get PricePredicting the pullout response of inclined straight steel
Nov 14 2009 · Fiber pullout tests have been used for decades to characterize and optimize bond strength on fiber reinforced concretes. However most of the investigations focus on the behavior of fibers aligned with load direction whose pullout mechanisms are not representative of the ones existing in real applications where random orientation of fibers is likely to occur.
Get PriceModeling of fiber-reinforced cement composites Discrete
With respect to fracture in multi-fiber composites the proposed model matches theoretical predictions of post-cracking strength and pullout displacement corresponding to the load-free condition. The work presented herein is a significant step toward the modeling of strain-hardening composites that exhibit multiple cracking.
Get PricePredicting the pullout response of inclined straight steel
Nov 14 2009 · Fiber pullout tests have been used for decades to characterize and optimize bond strength on fiber reinforced concretes. However most of the investigations focus on the behavior of fibers aligned with load direction whose pullout mechanisms are not representative of the ones existing in real applications where random orientation of fibers is likely to occur.
Get PriceMaterials Free Full-Text Pullout Behavior of Bundled
The tensile performance of fiber-reinforced cementitious composite (FRCC) after first matrix cracking is characterized by a tensile stress ndashcrack width relationship called the bridging law. The bridging law can be obtained by an integral calculus of forces carried by individual bridging fibers considering the effect of the fiber inclination angle. The main objective of this study is to
Get PricePull-out behaviour of hooked steel fibres SpringerLink
A programme of research is described that has investigated the fracture of steel fibre reinforced sprayed concrete under flexural load with the aim of developing a stress-profile model to predict flexural behaviour in the form of a load-deflection response. This paper reports the work associated with establishing the pull-out characteristics of hooked end fibres.
Get PriceMaterials Free Full-Text Inclined Fiber Pullout from a
It is well known that fibers improve the performance of cementitious composites by acting as bridging ligaments in cracks. Such bridging behavior is often studied through fiber pullout tests. The relation between the pullout force vs. slip end displacement is characteristic of the fiber-matrix interface. However such a relation varies significantly with the fiber
Get PriceFiber Pullout and Bond Slip. II Experimental Validation
Very good agreement is observed. The model is also used to derive for the first time bond shear stress versus slip curves typical of fiber‐reinforced concrete and considered a constitutive property of the fiber‐concrete interface.
Get PriceExperimental investigations on inclined pullout behaviour
Since geogrids are widely used as veneer reinforcement inclined pullout tests are conducted on geogrids embedded in run-out I-type and L-type anchors in sand. The maximum pullout force in the geogrid increases by more than 20 as the pull inclination increases from 0° to
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