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Stanley Backer

Bio: Stanley Backer is an academic researcher from Massachusetts Institute of Technology. The author has contributed to research in topics: Ultimate tensile strength & Tensile testing. The author has an hindex of 26, co-authored 70 publications receiving 2377 citations.


Papers
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TL;DR: In this article, it is suggested that for effective use of the reinforcing fibres, fiber bundling should be minimized and the fibre/matrix bond property should be controlled. But, the results of the experiments were limited by the strength of the cement matrix at high angles due to matrix spalling.

370 citations

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TL;DR: In this paper, a micromechanical model has been formulated for the post-cracking behavior of a brittle matrix composite reinforced with randomly distributed short fibers, which incorporates the mechanics of pull-out of fibers which are inclined at an angle to the matrix crack plane and which undergo slip-weakening or sliphardening during the pullout process.
Abstract: A micromechanical model has been formulated for the post-cracking behavior of a brittle matrix composite reinforced with randomly distributed short fibers. This model incorporates the mechanics of pull-out of fibers which are inclined at an angle to the matrix crack plane and which undergo slip-weakening or slip-hardening during the pull-out process. In addition, the random location and orientation of fibers are accounted for. Comparisons of model predictions of post-cracking tension-softening behavior with experimental data appear to support the validity of the model. The model is used to examine the effects of fiber length, snubbing friction coefficient and interfacial bond behavior on composite post-cracking tensile properties. The scaling of the bridging fracture toughening with material parameters is discussed.

304 citations

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TL;DR: In this article, a theoretical model motivated by observations of fiber surface abrasion is developed to predict the pull-out force versus displacement relationship, taking into consideration the variation of the frictional fibre-matrix bond strength with fibre slippage distance.

125 citations

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TL;DR: In this article, the authors compare the mechanical behavior of woven and nonwoven fabrics and outline the principal mechanisms by which woven cloths deform and recover in manufacture and in end usage.
Abstract: The authors compare the mechanical behavior of woven and nonwoven fabrics. They outline the principal mechanisms by which woven cloths deform and recover in manufacture and in end usage. They attem...

106 citations

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TL;DR: In this article, the importance of fabric geometry in the development of more utilitarian and serviceable textile materials is discussed and a literature review is presented which shows the relationship between the structural char acteristics of fabrics and various functional characteristics, such as breaking strength and elongation, tear-resistance, thermal insulation, abrasionresistance and gas permeability.
Abstract: This is the first in a series of papers to be issued by the Quartermaster Corps discussing the importance of fabric geometry in the development of more utilitarian and serviceable textile materials. It is a literature review which shows the relationship between the structural char acteristics of fabrics and various functional characteristics, such as breaking strength and elongation, tear-resistance, thermal insulation, abrasion-resistance, and gas permeability.

102 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the pseudostrain-hardening phenomenon of brittle matrix composites reinforced with discontinuous flexible and randomly distributed fibers is analyzed based on a cohesive crack-mechanics approach, and the first crack strength and strain are derived in terms of fiber, matrix, and interface micromechanical properties.
Abstract: This paper analyzes the pseudostrain‐hardening phenomenon of brittle matrix composites reinforced with discontinuous flexible and randomly distributed fibers, based on a cohesive crack‐mechanics approach. The first crack strength and strain are derived in terms of fiber, matrix, and interface micromechanical properties. Conditions for steady‐state cracking and multiple cracking are found to depend on two nondimensionalized parameters that embody all relevant material micromechanical parameters. The results are therefore quite general and applicable to a variety of composite‐material systems. Phrased in terms of a failure‐mechanism map, various uniaxial load‐deformation behaviors for discontinuous fiber composites can be predicted. The influence of a snubbing effect due to local fiber/matrix interaction for randomly oriented crack‐bridging fibers on the composite properties is also studied.

975 citations

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TL;DR: In this article, an analytical method considering the effects of fiber length and fiber orientation distributions for predicting the tensile strength of short-fiber-reinforced polymers (SFRP) was presented.

685 citations

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TL;DR: In this paper, a review and categorization of a variety of tensile test setups used by other researchers and presents a revised tensile set up tailored to obtain reliable results with minimal preparation effort.
Abstract: Enhanced matrix packing density and tailored fiber-to-matrix interface bond properties have led to the recent development of ultra-high performance fiber reinforced concrete (UHP-FRC) with improved material tensile performance in terms of strength, ductility and energy absorption capacity. The objective of this research is to experimentally investigate and analyze the uniaxial tensile behavior of the new material. The paper reviews and categorizes a variety of tensile test setups used by other researchers and presents a revised tensile set up tailored to obtain reliable results with minimal preparation effort. The experimental investigation considers three types of steel fibers, each in three different volume fractions. Elastic, strain hardening and softening tensile parameters, such as first cracking stress and strain, elastic and strain hardening modulus, composite strength and energy dissipation capacity, of the UHP-FRCs are characterized, analyzed and linked to the crack pattern observed by microscopic analysis. Models are proposed for representing the tensile stress–strain response of the material.

542 citations

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TL;DR: In this article, the effect of incorporating nanomaterials in low dosages to the fabrication, workability, hydration, microstructure, and mechanical properties of cement-based composites are comprehensively reviewed.

512 citations