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  • Open Access


    Multi-Scale Damage Model for Quasi-Brittle Composite Materials

    Decheng Feng1, 2, *

    CMES-Computer Modeling in Engineering & Sciences, Vol.122, No.3, pp. 997-1014, 2020, DOI:10.32604/cmes.2020.07265

    Abstract In the present paper, a hierarchical multi-scale method is developed for the nonlinear analysis of composite materials undergoing heterogeneity and damage. Starting from the homogenization theory, the energy equivalence between scales is developed. Then accompanied with the energy based damage model, the multi-scale damage evolutions are resolved by homogenizing the energy scalar over the meso-cell. The macroscopic behaviors described by the multi-scale damage evolutions represent the mesoscopic heterogeneity and damage of the composites. A rather simple structure made from particle reinforced composite materials is developed as a numerical example. The agreement between the fullscale simulating More >

  • Open Access


    Stress Analysis of Printed Circuit Board with Different Thickness and Composite Materials Under Shock Loading

    Kuan-Ting Liu1, Chun-Lin Lu1, Nyan-Hwa Tai2, Meng-Kao Yeh1, *

    CMES-Computer Modeling in Engineering & Sciences, Vol.122, No.2, pp. 661-674, 2020, DOI:10.32604/cmes.2020.07792

    Abstract In this study, the deformation and stress distribution of printed circuit board (PCB) with different thickness and composite materials under a shock loading were analyzed by the finite element analysis. The standard 8-layer PCB subjected to a shock loading 1500 g was evaluated first. Moreover, the finite element models of the PCB with different thickness by stacking various number of layers were discussed. In addition to changing thickness, the core material of PCB was replaced from woven E-glass/epoxy to woven carbon fiber/epoxy for structural enhancement. The non-linear material property of copper foil was considered in… More >

  • Open Access


    Fiber Grating-Based Strain Sensor Array for Health Monitoring of Pipelines

    Hui Wang1, Songyou Li2, Lei Liang3,*, Gang Xu4,5, Bin Tu6

    Structural Durability & Health Monitoring, Vol.13, No.4, pp. 347-359, 2019, DOI:10.32604/sdhm.2019.05139

    Abstract Pipelines are one of the most important modern energy transportation methods, used especially for the transportation of certain dangerous energy media materials such as crude oil, natural gas, and chemical raw materials. New requirements have been put forward for the health monitoring and early security warning of pipelines because of the large-scale and complicated development trend of the pipe network system. To achieve an accurate assessment of the health conditions of pipeline infrastructure, obtaining as many precise operating parameters as possible, particularly at some critical parts of the pipeline, is necessary. Therefore, a novel type… More >

  • Open Access


    A Simple Model for the Evaluation of Constitutive Laws for the Computer Simulation of Fatigue-Driven Delamination in Composite Materials

    Ugo Galvanetto, Paul Robinson, Agostino Cerioni, Carlos Lopez Armas

    Structural Durability & Health Monitoring, Vol.5, No.2, pp. 161-190, 2009, DOI:10.3970/sdhm.2009.005.161

    Abstract This paper presents a simple mathematical model to investigate various formulations of interface elements which are used to simulate fatigue driven delamination in composite materials. To illustrate the effectiveness of the model it is used to evaluate the performance of several different static constitutive laws and damage definitions coupled with a particular fatigue degradation strategy. It is shown that the model can be used to readily assess the robustness and reliability of the different formulations by examining hundreds of thousands of sets of parameter values in a rational and efficient manner. More >

  • Open Access


    Analytical and Experimental Investigations of Extending the Crack Growth Life of Integrally Stiffened Aluminum Panels by the Use of Composite Material Strips

    A. Brot1, I. Kressel1

    Structural Durability & Health Monitoring, Vol.7, No.3, pp. 153-162, 2011, DOI:10.3970/sdhm.2011.007.153

    Abstract Analysis and testing of integrally stiffened aluminum panels, reinforced by carbon-epoxy or boron-epoxy bonded strips, is described. Fatigue testing was performed at room-temperature and at -50°C. The test results show a very significant increase in the crack growth life of these panels after the reinforcement. The analytical results, based on finite-element models, correlated very well with the test results. More >

  • Open Access


    Experimental Analysis on Durability of Brick-Masonry Panels Subjected to Cyclic Loads

    R.S. Olivito1, F.A. Zuccarello1

    Structural Durability & Health Monitoring, Vol.2, No.1, pp. 19-28, 2006, DOI:10.3970/sdhm.2006.002.019

    Abstract During the last decades FRP materials have been utilized in many civil engineering applications for their good performances in substituting traditional restoration techniques, especially in reinforcing and restoring damaged structures. At present, the use of composite materials is greatly increasing as a consequence of the fact that conservation and restoration of existing historic heritage are becoming key issues for civil engineers and architects. This paper deals with the behavior of brick masonry models subjected to cyclic loads with the aim of studying their performances and durability. Firstly the models were damaged by imposing a strain More >

  • Open Access


    Mechanical Properties of a Eucalyptus-Based Oriented Oblique Strand Lumber for Structural Applications

    Jiawei Chen1, Haibei Xiong1,*, Zhifang Wang1, Linqing Yang2

    Journal of Renewable Materials, Vol.7, No.11, pp. 1147-1164, 2019, DOI:10.32604/jrm.2019.07642

    Abstract Wood and wood-based composite materials have gained increasing attention in the sustainable building industry because of their renewability and environmental friendliness. Oriented oblique strand lumber (Eucalyptus Strand Wood, ESWood), which is manufactured from fast-growing small diameter eucalyptus wood (Eucalyptus urophylla × E. grandis), is introduced in this paper. Small clear specimen tests were conducted to determine the mechanical properties of ESWood material while full-scale component tests were performed to observe the structural performance of ESWood beams. A comparison of mechanical properties of ESWood with other wood/bamboo-based materials is then reported. From the results presented herein,… More >

  • Open Access


    Weight-Minimization of Sandwich Structures by a Heuristic Topology Optimization Algorithm

    C. Tapp1, W. Hansel, C. Mittelstedt, W. Becker2

    CMES-Computer Modeling in Engineering & Sciences, Vol.5, No.6, pp. 563-574, 2004, DOI:10.3970/cmes.2004.005.563

    Abstract A heuristic algorithm for the weight minimization of sandwich plates is presented. The method is based on a preexisting algorithm for the layerwise topology optimization of symmetric laminates under in-plane loads. The presented algorithm uses structural analyses based on finite elements and explicitly accounts for the special sandwich situation. During the optimization procedure the algorithm adds or subtracts material from the layers of the face sheets and the core of the sandwich plate in regions of high or low stresses respectively. The orientation angles of the layers of the sandwich facings are not varied inorder More >

  • Open Access


    Elastic wave propagation in fiber reinforced composite materials with non-uniform distribution of fibers

    J.T. Verbis1, S.V. Tsinopoulos2, D. Polyzos2

    CMES-Computer Modeling in Engineering & Sciences, Vol.3, No.6, pp. 803-814, 2002, DOI:10.3970/cmes.2002.003.803

    Abstract In the present work the iterative effective medium approximation (IEMA) is appropriately used for wave dispersion and attenuation predictions in fiber-reinforced composites that microscopically exhibit a non-uniform fiber distribution. Two types of composites with such irregular topology of fibers are considered. The first contains a regular distribution of clusters of fibers embedded in a composite matrix with uniformly distributed fibers, and the second a uniform distribution of matrix-rich inclusions embedded in a fiber-rich regular composite medium. The resulting from the application of the IEMA scattering problems are solved numerically by means of a two dimensional More >

  • Open Access


    Design and Manufacturing of Composite Materials using 3D Printer

    Ryosuke Matsuzaki1,*, Taishi Nakamura1, Yusuke Yamagata1, Akira Todoroki2, Masahito Ueda3, Yoshiyasu Hirano4

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.4, pp. 171-171, 2019, DOI:10.32604/icces.2019.05205

    Abstract When continuous carbon fiber composites are molded with a 3D printer, three-dimensional complex structure can be integrally molded, which leads to reduction of manufacturing time and cost. In addition, because the curved continuous fibers can be printed in a plane when the 3D printer is utilized, the design space and capability of 3D printed composites will drastically expand compared with using just straight fibers such as conventional prepreg. However, printing accuracy of composite materials may be affected uniquely by parameters such as number of fibers in tow, printing curvature, compaction pressure etc. In this study,… More >

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