The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform

Rajesh Kumar - One of the best experts on this subject based on the ideXlab platform.

  • tensile response of tubular braids with an Elastic Core
    Composites Part A-applied Science and Manufacturing, 2013
    Co-Authors: Amit Rawal, Harshvardhan Saraswat, Rajesh Kumar
    Abstract:

    Abstract Circular braiding has been traditionally used for forming tubular structures but there is an ever-increasing interest to use these structures for various composite applications. A tubular braid without any Core undergoes large lateral contraction but when Elastic materials are inserted in the hollow braids, they can potentially act as reinforcement in energy absorbing composites. In this paper, the tensile behaviour of tubular braids consisting of an Elastic Core has been predicted based on defined braid geometry, Core properties and tensile properties of helically undulated strands of filaments. The constituent filaments considered here are monofilament type but the proposed tensile model of braid–Core system has also been extended for low twist multifilament yarns with non-hybrid weave. Braid angle is found to be the most important design parameter for varying the extensibility of braid–Core systems. A comparison has been made between the theoretical and experimental stress–strain curves of tubular braids consisting of Elastic Core.

Amit Rawal - One of the best experts on this subject based on the ideXlab platform.

  • tensile response of tubular braids with an Elastic Core
    Composites Part A-applied Science and Manufacturing, 2013
    Co-Authors: Amit Rawal, Harshvardhan Saraswat, Rajesh Kumar
    Abstract:

    Abstract Circular braiding has been traditionally used for forming tubular structures but there is an ever-increasing interest to use these structures for various composite applications. A tubular braid without any Core undergoes large lateral contraction but when Elastic materials are inserted in the hollow braids, they can potentially act as reinforcement in energy absorbing composites. In this paper, the tensile behaviour of tubular braids consisting of an Elastic Core has been predicted based on defined braid geometry, Core properties and tensile properties of helically undulated strands of filaments. The constituent filaments considered here are monofilament type but the proposed tensile model of braid–Core system has also been extended for low twist multifilament yarns with non-hybrid weave. Braid angle is found to be the most important design parameter for varying the extensibility of braid–Core systems. A comparison has been made between the theoretical and experimental stress–strain curves of tubular braids consisting of Elastic Core.

Harshvardhan Saraswat - One of the best experts on this subject based on the ideXlab platform.

  • tensile response of tubular braids with an Elastic Core
    Composites Part A-applied Science and Manufacturing, 2013
    Co-Authors: Amit Rawal, Harshvardhan Saraswat, Rajesh Kumar
    Abstract:

    Abstract Circular braiding has been traditionally used for forming tubular structures but there is an ever-increasing interest to use these structures for various composite applications. A tubular braid without any Core undergoes large lateral contraction but when Elastic materials are inserted in the hollow braids, they can potentially act as reinforcement in energy absorbing composites. In this paper, the tensile behaviour of tubular braids consisting of an Elastic Core has been predicted based on defined braid geometry, Core properties and tensile properties of helically undulated strands of filaments. The constituent filaments considered here are monofilament type but the proposed tensile model of braid–Core system has also been extended for low twist multifilament yarns with non-hybrid weave. Braid angle is found to be the most important design parameter for varying the extensibility of braid–Core systems. A comparison has been made between the theoretical and experimental stress–strain curves of tubular braids consisting of Elastic Core.

Xiangyu Wang - One of the best experts on this subject based on the ideXlab platform.

  • an innovative approach to theoretical analysis of partitioned width stability of strip pillar in strip mining
    International Journal of Rock Mechanics and Mining Sciences, 2020
    Co-Authors: Rui Wang, Zhiguo Chang, Xiangyu Wang
    Abstract:

    Abstract The strip mining method is preferred to the extraction of coal resources under surface buildings, water bodies and railways in China. Strip pillars with appropriate widths play a significant role in controlling stress distribution and surface subsidence. The strip mining activity at Tangkou coal mine in Eastern China is taken as the engineering background in the paper. In order to evaluate the general strip pillar design of mining area no. 430, an innovative analytical model is developed to determine the yield width and the Elastic Core width of the strip pillar under the stress superimposition effect in this paper. In the proposed model, the strip pillar is divided into the yield zone and the Elastic Core zone on the basis of the existing reasonable structural division of the strip pillar. Based on the Drucker-Prager criterion which considers the influence of the intermediate principal stress, the formulae of the partitioned width of the strip pillar are inferred. The yield width of the strip pillar with one-sided goaf is derived based on the limit equilibrium theory and the Drucker-Prager criterion. The yield width of the strip pillar with two-sided goafs is obtained based on the stress superimposition method. The Elastic Core width of the strip pillar is obtained by the semi-inverse method with the consideration of mine pressure and the application of the Drucker-Prager criterion. As a case study, the proposed model is used to determine the yield width and the Elastic Core width of the strip pillar at Tangkou coal mine in China. Comparing the obtained results with the in-situ measurement data, it can be concluded that the proposed analytical model is effective in calculating the yield width and the Elastic Core width of the strip pillar. In order to evaluate the effects of the parameters in the proposed model on the yield width of the strip pillar with one-sided goaf and the Elastic Core width of the strip pillar with two-sided goafs, a detailed sensitivity analysis is conducted based on the actual data at from Tangkou coal mine.

  • An innovative approach to theoretical analysis of partitioned width & stability of strip pillar in strip mining
    International Journal of Rock Mechanics and Mining Sciences, 2020
    Co-Authors: Rui Wang, Zhiguo Chang, Xiangyu Wang
    Abstract:

    Abstract The strip mining method is preferred to the extraction of coal resources under surface buildings, water bodies and railways in China. Strip pillars with appropriate widths play a significant role in controlling stress distribution and surface subsidence. The strip mining activity at Tangkou coal mine in Eastern China is taken as the engineering background in the paper. In order to evaluate the general strip pillar design of mining area no. 430, an innovative analytical model is developed to determine the yield width and the Elastic Core width of the strip pillar under the stress superimposition effect in this paper. In the proposed model, the strip pillar is divided into the yield zone and the Elastic Core zone on the basis of the existing reasonable structural division of the strip pillar. Based on the Drucker-Prager criterion which considers the influence of the intermediate principal stress, the formulae of the partitioned width of the strip pillar are inferred. The yield width of the strip pillar with one-sided goaf is derived based on the limit equilibrium theory and the Drucker-Prager criterion. The yield width of the strip pillar with two-sided goafs is obtained based on the stress superimposition method. The Elastic Core width of the strip pillar is obtained by the semi-inverse method with the consideration of mine pressure and the application of the Drucker-Prager criterion. As a case study, the proposed model is used to determine the yield width and the Elastic Core width of the strip pillar at Tangkou coal mine in China. Comparing the obtained results with the in-situ measurement data, it can be concluded that the proposed analytical model is effective in calculating the yield width and the Elastic Core width of the strip pillar. In order to evaluate the effects of the parameters in the proposed model on the yield width of the strip pillar with one-sided goaf and the Elastic Core width of the strip pillar with two-sided goafs, a detailed sensitivity analysis is conducted based on the actual data at from Tangkou coal mine.

Slah Msahli - One of the best experts on this subject based on the ideXlab platform.

  • Study of the mechanical behaviour of the Elastic-Core-spun yarns
    Journal of The Textile Institute, 2013
    Co-Authors: Amel Babay, H. Helali, Slah Msahli
    Abstract:

    The elastane-Core-spun yarns are hard to be controlled because of the absence of specific tests. Therefore, this study is aims to determine the appropriate conditions to test the mechanical behaviour in term of tensile and relaxation tests. In the present study, cotton-covered elastane-Core-spun yarns were used with the same twist factor and various elastane draft values. The analytical results showed that the pretension necessary to deploy the Elastic-Core-spun yarn increases while the elastane draft increases. Moreover, the elastane ratios have an important effect on the yarn properties for different tests, especially the tensile and the relaxation tests. Besides, the experimental conditions such as the extension rate and the specimen length have a great influence on the mechanical properties.

  • Rheological Modeling of the Dorlastan Core Spun Yarns for Various Dorlastan Drafts and Yarn Counts
    Journal of Textile Science & Engineering, 2013
    Co-Authors: H. Helali, Babay Dhouib A, Slah Msahli, Cheikhrouhou M
    Abstract:

    The mechanical behaviour of the Dorlastan® Core spun yarns having different counts (100, 50, 33.33 and 25 tex) and various elastane drafts is modeled in this paper. The theoretical analysis is based on the response of the Elastic Core spun yarn to the tensile and the relaxation tests at different strain levels. These tests have permitted us to identify the non linear viscoElastic behaviour of the Dorlastan® Core spun yarn. Analogical approach is employed to propose the rheological model describing the mechanical behaviour of the Elastic Core spun yarns. Comparing with the experimental data, the theoretical model gives a reasonably accurate prediction of the mechanical behaviour of the Elastic Core spun yarns for both tensile and relaxation tests.

  • Effect of elastane draft on the rheological modelling of elastane Core spun yarn
    Journal of The Textile Institute, 2012
    Co-Authors: H. Helali, Amel Babay, Slah Msahli
    Abstract:

    The main purpose of modelling the yarn structure is to find relations that are more reliable giving the behaviour of the yarn starting from its components. In this paper, the identification of the mechanical behaviour of the Elastic Core spun yarns by a rheological modelling on the basis of pre-existent phenomenological models is presented. In this model, the Elastic Core spun yarn is considered as a viscoElastic material. The model is verified experimentally with two types of Elastic Core spun yarns 50/78 and 59/156 and a range of draft of five values for two types of yarn and two values of elastane count in dtex (78 and 156). Comparative analysis of the theoretical and experimental tensile curves indicates a high level of correlation between both data-sets. The effect of the elastane draw ratios on the parameters of this model is established in the second part of this paper. Our test results revealed that the elastane draft is one of the important factors influencing the Elasticity and the viscosity of ...