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  • Open AccessOpen Access

    EDITORIAL

    Introduction to the Special Issue on Recent Developments of Peridynamics

    Qing Zhang1, *, Jianxiang Wang2, Xiaoying Zhuang3, 4
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 349-351, 2019, DOI:10.32604/cmes.2019.09088
    （This article belongs to this Special Issue: Recent Developments on Peridynamics)
    Abstract This article has no abstract. More >

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    1678

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    ARTICLE

    A Dual-Support Smoothed Particle Hydrodynamics for Weakly Compressible Fluid Inspired By the Dual-Horizon Peridynamics

    Huilong Ren1, Xiaoying Zhuang2,3,*, Timon Rabczuk1
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 353-383, 2019, DOI:10.32604/cmes.2019.05146
    （This article belongs to this Special Issue: Recent Developments on Peridynamics)
    Abstract A dual-support smoothed particle hydrodynamics (DS-SPH) that allows variable smoothing lengths while satisfying the conservations of linear momentum, angular momentum and energy is developed. The present DS-SPH is inspired by the dual-support, a concept introduced from dual-horizon peridynamics from the authors and applied here to SPH so that the unbalanced interactions between the particles with different smoothing lengths can be correctly considered and computed. Conventionally, the SPH formulation employs either the influence domain or the support domain. The concept of dual-support identifies that the influence domain and the support domain involves the duality and should be simultaneously in the SPH… More >

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    1846

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    4

  • Open AccessOpen Access

    ARTICLE

    A Possible Reason About Origin of Singularity and Anomalous Dispersion in Peridynamics

    Xinfeng Wang1, Zaixing Huang1,*
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 385-398, 2019, DOI:10.32604/cmes.2019.06936
    （This article belongs to this Special Issue: Recent Developments on Peridynamics)
    Abstract In the benchmark problems of peridynamics, there are some eccentric results, for example, singularity of uniaxial tension and anomalous dispersion of wave. The reasons to give rise to these results are investigated. We calculated local tension and wave of an infinite rod after adding a divergence of local stress in the peridynamic motion equation. The acquired results verify that the singularity in the peridynamic solution of local tension problem and anomalous dispersion of peridynamic wave are all eliminated. Therefore, the anomalous features of some peridynamic solutions likely stem from the lack of local stress characterizing contact interactions. More >

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    1644

  • Open AccessOpen Access

    ARTICLE

    A Hybrid Local/Nonlocal Continuum Mechanics Modeling and Simulation of Fracture in Brittle Materials

    Yongwei Wang1, Fei Han2,*, Gilles Lubineau1,*
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 399-423, 2019, DOI:10.32604/cmes.2019.07192
    （This article belongs to this Special Issue: Recent Developments on Peridynamics)
    Abstract Classical continuum mechanics which leads to a local continuum model, encounters challenges when the discontinuity appears, while peridynamics that falls into the category of nonlocal continuum mechanics suffers from a high computational cost. A hybrid model coupling classical continuum mechanics with peridynamics can avoid both disadvantages. This paper describes the hybrid model and its adaptive coupling approach which dynamically updates the coupling domains according to crack propagations for brittle materials. Then this hybrid local/nonlocal continuum model is applied to fracture simulation. Some numerical examples like a plate with a hole, Brazilian disk, notched plate and beam, are performed for verification… More >

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    2134

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  • Open AccessOpen Access

    ARTICLE

    Coupled Digital Image Correlation and Peridynamics for Full-Field Deformation Measurement and Local Damage Prediction

    Tianyi Li1, Xin Gu1, Qing Zhang1,*, Dong Lei1
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 425-444, 2019, DOI:10.32604/cmes.2019.06700
    （This article belongs to this Special Issue: Recent Developments on Peridynamics)
    Abstract Digital image correlation (DIC) measurement technique and peridynamics (PD) method have been applied in specific fields extensively owing to their respective advantages in obtaining full-field deformation and local failure of loaded materials and structures. This study provides a simple way to couple DIC measurements with PD simulations, which can circumvent the difficulties of DIC in dealing with discontinuous deformations. Taking the failure analysis of a compact tension specimen of aluminum alloy and a static three-point bending concrete beam as examples, the DIC experimental system firstly measures the full-field displacements, and then the PD simulation is applied on potential damage regions… More >

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  • Open AccessOpen Access

    ARTICLE

    Dynamic Fracture Analysis of Functionally Gradient Materials with Two Cracks By Peridynamic Modeling

    Zhanqi Cheng1, Dongdong Jin1, Chengfang Yuan1, Le Li1,*
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 445-464, 2019, DOI:10.32604/cmes.2019.06374
    （This article belongs to this Special Issue: Recent Developments on Peridynamics)
    Abstract In the research, the dynamic fracture failure problem of functionally graded materials (FGMs) containing two pre-cracks was analyzed using a bond-based Peridynamic (PD) method numerical model. The two convergence of decreasing the area of PD horizon (δ-convergence) and uniform mesh refinement (m-convergence) were studied. The effects of both crack position and distance between two cracks on crack propagation pattern in FGMs plate under tensile loads are studied. Furthermore, the effects of different gradient patterns on the dynamic propagation of cracks in FGMs are also investigated. The simulate results suggest that the cracks positions and the distance between them can significantly… More >

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  • Open AccessOpen Access

    ARTICLE

    Peridynamic Modeling and Simulation of Ice Craters By Impact

    Ying Song1,2, Jiale Yan1,2, Shaofan Li2,*, Zhuang Kang1
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 465-492, 2019, DOI:10.32604/cmes.2019.07190
    （This article belongs to this Special Issue: Recent Developments on Peridynamics)
    Abstract In the present work, a state-based peridynamics with adaptive particle refinement is proposed to simulate water ice crater formation due to impact loads. A modified Drucker-Prager constitutive model was adopted to model ice and was implemented in the state-based peridynamic equations to analyze the elastic-plastic deformation of ice. In simulations, we use the fracture toughness failure criterion in peridynamics to simulate the quasi-brittle failure of ice. An adaptive particle refinement method in peridynamics was proposed to improve computational efficiency. The results obtained using the peridynamic model were compared with the experiments in previous literatures. It was found that the peridynamic… More >

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  • Open AccessOpen Access

    ARTICLE

    The Multi-Horizon Peridynamics

    Ali Jenabidehkordi1,2, Timon Rabczuk1,2,*
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 493-500, 2019, DOI:10.32604/cmes.2019.07942
    （This article belongs to this Special Issue: Recent Developments on Peridynamics)
    Abstract We present a novel refinement approach in peridynamics (PD). The proposed approach takes advantage of the PD flexibility in choosing the shape of the horizon by introducing multiple domains (with no intersections) to the nodes of the refinement zone. We will show that no ghost forces are needed when changing the horizon sizes in both subdomains. The approach is applied to both bond-based and state-based peridynamics and verified for a simple wave propagation refinement problem illustrating the efficiency of the method. More >

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  • Open AccessOpen Access

    ARTICLE

    Numerical Simulation of Dynamic Interaction Between Ice and Wide Vertical Structure Based on Peridynamics

    Bin Jia1, Lei Ju1,*, Qing Wang1
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 501-522, 2019, DOI:10.32604/cmes.2019.06798
    （This article belongs to this Special Issue: Recent Developments on Peridynamics)
    Abstract In the ice-covered oceanic region, the collision between sea ice and offshore structures will occur, causing the crushing failure of ice and the vibration of structures. The vibration can result in fatigue damage of structure and even endanger the crews’ health. It is no doubt that this ice-structure interaction has been noted with great interest by the academic community for a long time and numerous studies have been done through theoretical analysis, experimental statistics and numerical simulation. In this paper, the bond-based Peridynamics method is applied to simulate the interaction between sea ice and wide vertical structures, where sea ice… More >

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    3303

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    1753

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  • Open AccessOpen Access

    ARTICLE

    Numerical Simulations of the Ice Load of a Ship Navigating in Level Ice Using Peridynamics

    Yanzhuo Xue1, Renwei Liu1, Yang Liu1,*, Lingdong Zeng1, Duanfeng Han1
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 523-550, 2019, DOI:10.32604/cmes.2019.06951
    （This article belongs to this Special Issue: Recent Developments on Peridynamics)
    Abstract In this study, a numerical method was developed based on peridynamics to determine the ice loads for a ship navigating in level ice. Convergence analysis of threedimensional ice specimen with tensile and compression loading are carried out first. The effects of ice thickness, sailing speed, and ice properties on the mean ice loads were also investigated. It is observed that the ice fragments resulting from the icebreaking process will interact with one another as well as with the water and ship hull. The ice fragments may rotate, collide, or slide along the ship hull, and these ice fragments will eventually… More >

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    5354

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    2111

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    1

  • Open AccessOpen Access

    ARTICLE

    Research on Nonlinear Frequency Compression Method of Hearing Aid with Adaptive Compression Ratio

    Xia Wang1, Hongming Shen1, Huawei Tao2, Ruiyu Liang3, Xing Deng4,5, Haijian Shao5, Li Zhao6,*, Cairong Zou6
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 551-567, 2019, DOI:10.32604/cmes.2019.06314
    Abstract To make full use of the residual audible frequency band of hearing-loss patients and improve the intelligibility of speech, an adaptive nonlinear frequency compression (NFC) algorithm is proposed, which amplifies signals below the cutoff frequency while compresses signals above the cutoff frequency. Firstly, high-frequency signals are decomposed to critical band signals according to the BARK scale. Secondly, the global compression ratio is determined according to the patient's cutoff frequency and maximum audible frequency. Thirdly, the sub-band compression ratio is adaptively determined based on the global compression ratio and normalized average energy of subband signals. Finally, the high frequency signals are… More >

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    1289

  • Open AccessOpen Access

    ARTICLE

    Feature Selection with a Local Search Strategy Based on the Forest Optimization Algorithm

    Tinghuai Ma1,*, Honghao Zhou1, Dongdong Jia1, Abdullah Al-Dhelaan2, Mohammed Al-Dhelaan2, Yuan Tian3
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 569-592, 2019, DOI:10.32604/cmes.2019.07758
    Abstract Feature selection has been widely used in data mining and machine learning. Its objective is to select a minimal subset of features according to some reasonable criteria so as to solve the original task more quickly. In this article, a feature selection algorithm with local search strategy based on the forest optimization algorithm, namely FSLSFOA, is proposed. The novel local search strategy in local seeding process guarantees the quality of the feature subset in the forest. Next, the fitness function is improved, which not only considers the classification accuracy, but also considers the size of the feature subset. To avoid… More >

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    2606

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  • Open AccessOpen Access

    ARTICLE

    IDSH: An Improved Deep Supervised Hashing Method for Image Retrieval

    Chaowen Lu1,a, Feifei Lee1,a,*, Lei Chen1, Sheng Huang1, Qiu Chen2,*
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 593-608, 2019, DOI:10.32604/cmes.2019.07796
    Abstract Image retrieval has become more and more important because of the explosive growth of images on the Internet. Traditional image retrieval methods have limited image retrieval performance due to the poor image expression abhility of visual feature and high dimension of feature. Hashing is a widely-used method for Approximate Nearest Neighbor (ANN) search due to its rapidity and timeliness. Meanwhile, Convolutional Neural Networks (CNNs) have strong discriminative characteristics which are used for image classification. In this paper, we propose a CNN architecture based on improved deep supervised hashing (IDSH) method, by which the binary compact codes can be generated directly.… More >

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    3083

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    1518

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  • Open AccessOpen Access

    ARTICLE

    Synchronization of Robot Manipulators Actuated By Induction Motors with Velocity Estimator

    Felipe J. Torres1,*, Gerardo V. Guerrero2, Carlos D. García2, Ricardo Zavala-Yoe3, Mario A. García1, Adolfo R. López4
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 609-630, 2019, DOI:10.32604/cmes.2019.07153
    Abstract A complete modeling (including the actuator dynamics) of a robot manipulator that uses three-phase induction motors is presented in this paper. A control scheme is designed to synchronize robot manipulators actuated by induction motors under a masterslave scheme in the case where the joint velocity of the slave robots is estimated. All of the research on the synchronization of robot manipulators assumes the use of ideal actuators to drive the joints; for that reason, in this work, a three-phase induction motor is considered to be a direct-drive actuator for each joint. An entire model of the mated system is obtained… More >

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    1441

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    ARTICLE

    Vibration Analysis of a Drillstring in Horizontal Well

    Xiaohua Zhu1,*, Li Zeng1, Bo Li1
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 631-660, 2019, DOI:10.32604/cmes.2019.06755
    Abstract The complicated geological conditions will bring great challenges to the drillstring of horizontal wells for the reason that the increase of the well depth in SichuanChongqing region. Since drillstring failure and friction during drilling are generally caused by drillstring vibration, great importance must be attached to computer simulation methods for the prediction of drillstring vibration. A finite element model considering axial, lateral and torsional vibration is established. In order to verify the established numerical model, an indoor experimental device based on the similarity principle was established. The vibration characteristics of three shale gas horizontal wells drillstrings are described. The reasons… More >

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    5409

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    2333

  • Open AccessOpen Access

    ARTICLE

    Some Remarks on the Method of Fundamental Solutions for Two Dimensional Elasticity

    M. R. Hematiyan1,*, M. Arezou1, N. Koochak Dezfouli1, M. Khoshroo1
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 661-686, 2019, DOI:10.32604/cmes.2019.08275
    Abstract In this paper, some remarks for more efficient analysis of two-dimensional elastostatic problems using the method of fundamental solutions are made. First, the effects of the distance between pseudo and main boundaries on the solution are investigated and by a numerical study a lower bound for the distance of each source point to the main boundary is suggested. In some cases, the resulting system of equations becomes ill-conditioned for which, the truncated singular value decomposition with a criterion based on the accuracy of the imposition of boundary conditions is used. Moreover, a procedure for normalizing the shear modulus is presented… More >

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    1245

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    ARTICLE

    A Parametric Study of Mesh Free Interpolation Based Recovery Techniques in Finite Element Elastic Analysis

    Mohd. Ahmed1,*, Mohamed Hechmi El Ouni1, Devinder Singh2, Nabil Ben Kahla1
    CMES-Computer Modeling in Engineering & Sciences, Vol.121, No.2, pp. 687-786, 2019, DOI:10.32604/cmes.2019.06886
    Abstract The paper presents a parametric study on interpolation techniques based postprocessed error estimation in finite element elastic analysis by varying important parameters of recovery, interpolation scheme and type of patch construction. The quality of error estimation with recovery parameters is compared in terms of local and global effectivity of error estimation, rate of error convergence, and adaptively refined meshes. A mesh free moving least square interpolation technique with proven reliability and effectivity is introduced for improving the recovery of finite element solution errors. The post-processed finite element solutions of elastic problems are presented for performance study under different parameters of… More >

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