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  • Open Access

    ABSTRACT

    Dynamic Behaviour of High Strength Concrete Elements and Building Structures

    Roberta Apostolska1, Golubka Necevska-Cvetanovska2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.5, No.2, pp. 129-136, 2008, DOI:10.3970/icces.2008.005.129

    Abstract The IZIIS' contribution to development of high quality materials has been seen in realization of several scientific-research projects in the field of high strength concrete in the period from 1992 to 2006. Within the frames of these projects complex laboratory-experimental-analytical investigations have been performed to contribute to definition of the methodology for obtaining high stength concrete exclusively from domestic resources, to investigate joint behaviour of high strength materials and elements in nonlinear range as well as to define dynamic behaviour high strength concrete buildings exposed to seismic actions. The selected results from these investigations are More >

  • Open Access

    ABSTRACT

    Deformational Behavior and Strength of Catheter Reinforced with Braids (Visco-elastic Response under Multi-axial Loading for Tension and Torsion)

    Y. Kato, Y. Yamamura

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.4, No.2, pp. 87-92, 2007, DOI:10.3970/icces.2007.004.087

    Abstract The purpose of this study is to investigate the deformational behavior and strength of the catheter which is made from the soft nylon resin and is reinforced with thin stainless wires called braid. When we image the usage conditions of catheter in the actual surgical operation, it is expected that the multi-axial loading for tension, torsion and the bending are applied and deformations occurring in the catheter become very complicated. As the first step of this study to reveal these phenomena, the combined loadings for tension and torsion are chosen as the subject of this More >

  • Open Access

    ABSTRACT

    Ultimate strength performance of plasterboard lined steel stud walls under fire conditions

    P. Kolarkar1, M. Mahendran, S. Gunalan

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.4, pp. 243-244, 2009, DOI:10.3970/icces.2009.009.243

    Abstract Fire safety of light gauge cold-formed steel frame (LSF) stud wall systems is critical to the building design as their use has become increasingly popular in commercial, industrial and residential construction throughout Australia. These walls are made of a cold-formed steel frame lined with multiple plasterboards (up to 4 on each side) and are often used as load-bearing walls. Currently there is limited design information on LSF load bearing walls for use by Australian engineers and designers. Hence LSF wall manufacturers depend on full scale fire tests using the standard fire curve based on ISO834… More >

  • Open Access

    ARTICLE

    Shear Strength of Unbound Crop By-Products Using the Direct Shear Box Apparatus

    Morgan Chabannes1,2,*, Frédéric Becquart1,2, Nor-Edine Abriak1,2

    Journal of Renewable Materials, Vol.7, No.9, pp. 855-863, 2019, DOI:10.32604/jrm.2019.06779

    Abstract The return to old building methods by mixing crop by-products with mineral binders is arousing great interest in Europe since about 25 years. The use of these bio-aggregates based materials for the design of building envelopes is a valuable opportunity to deal with increasingly demanding thermal regulations. In addition, the regulatory framework is moving towards reducing the overall car-bon footprint of new buildings. Some traditional and historic buildings are based on timber framing with earth-straw as infill material for instance. Hemp concrete is a bio-based material that can be manually tamped in timber stud walls… More >

  • Open Access

    ARTICLE

    Studies on Epoxidised Castor Oil as Co-Plasticizer with Epoxidised Soyabean Oil for PVC Processing

    Gouni Thirupathiah1, Sukanya Satapathy1, Aruna Palanisamy1,*

    Journal of Renewable Materials, Vol.7, No.8, pp. 775-785, 2019, DOI:10.32604/jrm.2019.06399

    Abstract An acidic cation exchange resin has been used to prepare epoxidised castor oil (ECO) which was used as a co-plasticizer with epoxidised soyabean oil (ESBO) for processing polyvinyl chloride (PVC). The structure of ECO was confirmed and its physico chemical properties were evaluated. PVC/ (ESBO&ECO) blends were prepared by melt mixing and compression molded into sheets. The specimens were evaluated for tensile properties, impact strength and hardness. While the tensile strength did not vary much, the elongation reduced with the replacement of ESBO with ECO. Dynamic mechanical studies revealed that the glass transition temperature increased More >

  • Open Access

    ARTICLE

    Toddy Palm (Borassus Flabellifer) Fruit Fibre Bundles as Reinforcement in Polylactide (PLA) Composites: An Overview About Fibre and Composite Characteristics

    Nina Graupner1,*, Koranat Narkpiban2,5, Thiprada Poonsawat3, Porntip Tooptompong4, Jörg Müssig1

    Journal of Renewable Materials, Vol.7, No.8, pp. 693-711, 2019, DOI:10.32604/jrm.2019.06785

    Abstract Toddy palm fruit have an apparent density below 0.8 g/cm³ and offer an interesting lightweight construction potential in polylactide (PLA) composites reinforced with 37 mass-% fibres. Single fibre bundles show similar mechanical properties compared with coir: tensile strength of 240 MPa, Young´s modulus of 3.8 GPa and an elongation at break of 31%. However, density and diameter (~ 50 μm) of fruit fibre bundles are significantly lower. The compression moulded composites have a density of 0.9 g/cm³ and achieved an unnotched Charpy impact strength of 12 kJ/m², a tensile strength of 25 MPa, Young’s modulus… More >

  • Open Access

    ABSTRACT

    A Rigid-fiber-based Boundary Element Model for Strength Simulation of Carbon Nanotube Reinforced Composites

    H. T. Wang1, Z. H. Yao2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.2, pp. 95-96, 2009, DOI:10.3970/icces.2009.009.095

    Abstract Carbon nanotubes (CNTs) may provide ultimate enhancement in stiffness and str\discretionary {-}{}{}ength for composite materials. This paper presents a rigid-fiber-based boundary integral equation formulation for the numerical simulation of debonding process and the corresponding strength of CNT reinforced composites. The CNT/matrix interfaces are assumed to fail when the interfacial shear force reaches a prescribed threshold, and the CNTs and matrix are considered to be detached in the failed areas. The matrix with one or several tens of originally well-bonded CNTs is subjected to an incremental tensile load and the effective stress-strain relations are readily obtained… More >

  • Open Access

    ABSTRACT

    Advanced Probabilistic Neural Network for the Prediction of Concrete Strength

    Doo Kie Kim1, Seong Kyu Chang1, Sang Kil Chang1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.2, No.1, pp. 29-34, 2007, DOI:10.3970/icces.2007.002.029

    Abstract Accurate and realistic strength estimation before the placement of concrete is highly desirable. In this study, the advanced probabilistic neural network (APNN) was proposed to reflect the global probability density function by summing the heterogeneous local probability density function automatically determined in the individual standard deviation of variables. Currently, the estimation of the compressive strength of concrete is performed by a probabilistic neural network (PNN) on the basis of concrete mix proportions, and the PNN is improved by the iteration method. However, an empirical method has been incorporated to specify the smoothing parameter in the More >

  • Open Access

    ARTICLE

    Experimental Study and Finite Element Analysis on Ultimate Strength of Dual-Angle Cross Combined Section Under Compression

    Hao Hu1,2, Jian He1,*, Lian Song1, Zhifeng Zhan1, Zhengliang Li3

    CMES-Computer Modeling in Engineering & Sciences, Vol.119, No.3, pp. 499-539, 2019, DOI:10.32604/cmes.2019.06266

    Abstract This paper investigates Q420 dual-angle cross combined section columns under axial and eccentric compression by conducting experiments. The specimen parameters, experimental setup, and test results are presented. It showed that local buckling occurred apparently for single internode specimens (λ<35) under axial compression, while overall bending buckling appeared for others, and no torsional buckling occurred. The theoretical formulas on stability factor were derived by the energy approach. Non-linear finite element models considering residual stress were established using ANSYS which were verified by the corresponding experimental results. The parametric study was to evaluate the effects of slenderness ratio More >

  • Open Access

    ARTICLE

    The Effect of Fiber Diameter on the Compressive Strength of Composites - A 3D Finite Element Based Study

    Ch,ra S. Yerramalli1, Anthony M. Waas2

    CMES-Computer Modeling in Engineering & Sciences, Vol.6, No.1, pp. 1-16, 2004, DOI:10.3970/cmes.2004.006.001

    Abstract Results from a 3D finite element based study of the compression response of unidirectional fiber reinforced polymer matrix composites (FRPC) are presented in this paper. The micromechanics based study was used to simulate the compressive response of glass and carbon fiber reinforced polymer matrix composites, with a view to understanding the effect of fiber diameter on compression strength. Results from the modeling and simulation indicate the presence of a complex three dimensional stress state in the matrix of the FRPC. Results from the simulation highlight the role of fiber diameter on the compressive response of More >

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