Simulation of single fiber pullout response with account of fiber morphology

Ellis, Brett D.; Zhou, Min

doi:10.1016/j.cemconcomp.2014.01.003

Cited by 32 publications

(21 citation statements)

References 14 publications

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“…The untwisting was completed when the whole fiber was pulled out at the end of the simulation. The above observation is consistent with our experimental study and others such as Ellis et al [14].…”

Section: Appl Sci 2018 8 X For Peer Reviewsupporting

confidence: 94%

“…The untwisting phenomenon was found after around 1-3 minutes of pulling and the whole twisting shape disappeared completely after pullout, as shown in Fig.6. This untwisting phenomenon is consistent with the existing numerical studies from researchers such as Ellis et al [14] who numerically investigated the pullout response of the single twisted fiber with a triangular cross-section. As the untwisting behavior inside the concrete is invisible, we then conduct a numerical study in Section Numerical analysis to understand the untwisting characteristics inside the concrete.…”

Section: Image Analysissupporting

confidence: 90%

“…This might because the analytical model neglected the tangential frictional resistance after the debonding between the UHPC matrix and the twisted steel fiber; only the friction on the fiber-fiber interface at the effective untwisting length is considered. The pullout force can reach 200 N, which is generally larger than the existing studies [13,14,17]. This increase may be due to the higher mechanical properties of pure concrete without fibers and the better matrix-fiber interface produced in this study.…”

Section: Comparison Between Test and Analytical Solutionmentioning

confidence: 53%

“…At the yield limit state (i.e., T = M) in the plastic untwisting stage, Equation (16) can be rewritten as Substituting Equations (11)- (14) into Equations (9) and (10), the untwisting pullout force and the torque can be obtained as…”

Section: Fiber With a Rectangular Sectionmentioning

confidence: 99%

“…The current studies focus on the optimization of the factors that influence the fiber-matrix bond strength, cementitious matrix packing density and the tensile response of UHPFRC through either the direct tensile tests of dog bone specimens or the flexural bending tests. These factors mainly include fiber type [10,11], fiber volume fraction [11], fiber embedment length [12], fiber morphology [1,[12][13][14], fiber orientation [15,16], loading rate [3,13], cementitious material property [17], fiber-matrix interface property [12] and curing of cementitious material [12]. For example, Wille et al [3] showed that energy absorption capacity significantly increased with the fiber volume fraction of up to 3%.…”

Section: Introductionmentioning

confidence: 99%

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Pullout Response of Ultra-High-Performance Concrete with Twisted Steel Fibers

Liu

2019

Applied Sciences

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This paper aims to develop a pullout force formula and increase the understanding of the damage mechanisms of ultra-high-performance fiber reinforced concrete (UHPFRC) with twisted steel fibers (TSFs) through a pull-out test and finite element analysis (FEA). The formula was first obtained through a theoretical force analysis with model assumptions that are based on the experimental data in the literature. A microscale in-situ X-ray computed tomography (µXCT) was used to prepare 3D images of the cross-section of concrete before and after TSFs with three embedment lengths were pulled out. The tested pullout force values were used for comparison with the developed formula values. The µXCT images show the concrete matrix was preserved after the TSF was pulled out, indicating the stable pullout force values at the strain hardening stage was mainly caused by the fiber untwisting. FEA results show this untwisting behavior occurs on the effective untwisting length of TSF close to the exterior concrete surface. The theoretical formula values were found match well with the testing data. The developed formula is potentially used to analyze the pullout behavior of TSF with different geometries; thus, the design of the UHPFRC with TSFs can be optimized in the field.

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Section: Appl Sci 2018 8 X For Peer Reviewsupporting

confidence: 94%

Section: Image Analysissupporting

confidence: 90%

Section: Comparison Between Test and Analytical Solutionmentioning

confidence: 53%

Section: Fiber With a Rectangular Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pullout Response of Ultra-High-Performance Concrete with Twisted Steel Fibers

Liu

2019

Applied Sciences

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Comparative Flexural Toughness Evaluation of Steel Fibre-Reinforced Concrete

Manohar

Waseem

Singh

2020

J. Inst. Eng. India Ser. A

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Application-Specific Computational Materials Design via Multiscale Modeling and the Inductive Design Exploration Method (IDEM)

Ellis

2017

Integr Mater Manuf Innov

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The development of materials is a laborious, iterative, expensive, and intuitive process, often requiring decades to transition from early laboratory studies to commercial applications. This research seeks to address this issue by demonstrating a systematic process for linking process-structure-propertyperformance (PSPP) relations. We argue that the limitations on time for the material development process arise in large part due to lack of effective approaches for exploring the material design space that anticipates application requirements, objectives, and constraints. The material design process employed here utilizes hierarchical multiscale modeling, analytical models, and associated metamodels to construct a set of bottom-up deductive mappings, along with the inductive design exploration method (IDEM) to account for uncertainty in pursuing top-down inductive decision support problems that address application-specific design objectives. The demonstrated problem considers the simultaneous design of ultra-highperformance concrete material and a structural panel able to withstand a 1.5-MPa-ms reflected blast wave impulse. A set of PSPP mappings were constructed across micro-, meso-, and macro-length-scales using analytical expressions and a hierarchical multiscale finite element model at the single fiber, multiple fiber, and structural length scales. The set of PSPP deductive mappings considered seven design variables-panel thickness, fiber pitch, ratio of water to cementitious materials, curing temperature, and volume fractions of fibers, cement, and silica fume-across four hierarchical levels. After the set of deductive PSPP mappings were constructed and validated, ranged sets of feasible values for each design variable were determined via IDEM. Starting with the highest and next-tohigher hierarchical levels as the output and input spaces, respectively, IDEM was implemented via application of three steps-discretization of input variables, projection of discretized sets of input variables with account of uncertainty to a range in the output space, and determination of which sets of discrete input values satisfy the output space requirement(s). By recursively applying these three steps, the PSPP relations were robustly searched for properties, structures, and processes that satisfy the performance requirement(s). The advantages of this approach are the identification of ranged sets of values of design variables and the ability to account for propagated uncertainty. By defining additional mass and cost objectives, the feasible input space was then searched to find the preferred combination of values of design variables that minimized mass and minimized cost while maintaining a robust material and structural design.

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Simulation of single fiber pullout response with account of fiber morphology

Cited by 32 publications

References 14 publications

Pullout Response of Ultra-High-Performance Concrete with Twisted Steel Fibers

Pullout Response of Ultra-High-Performance Concrete with Twisted Steel Fibers

Comparative Flexural Toughness Evaluation of Steel Fibre-Reinforced Concrete

Application-Specific Computational Materials Design via Multiscale Modeling and the Inductive Design Exploration Method (IDEM)

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