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A new fracture criterion for peridynamic and dual-horizon peridynamics

Jinhai ZHAO, Hesheng TANG, Songtao XUE

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 4,   Pages 629-641 doi: 10.1007/s11709-017-0447-1

Abstract: A new fracture criterion based on the crack opening displacement for peridynamic (PD) and dual-horizon peridynamics (DH-PD) is proposed. When the relative deformation of the PD bond between the particles reaches the critical crack tip opening displacement of the fracture mechanics, we assume that the bond force vanishes. A new damage rule similar to the local damage rule in conventional PD is introduced to simulate fracture. The new formulation is developed for a linear elastic solid though the extension to nonlinear materials is straightforward. The performance of the new fracture criterion is demonstrated by four examples, i.e. a bilateral crack problem, double parallel crack, monoclinic crack and the double inclined crack. The results are compared to experimental data and the results obtained by other computational methods.

Keywords： Castigliano’s theorem     breaking energy     critical extension     XFEM     COD     PD-COD    

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The Theorem of the Resistance of Hydraulic Machine's Materials to Cavitation Erosion and Abrasion

Wang Biao,Wang Yudong,Zhang Zihua,Ye Xianguo

Strategic Study of CAE 2003, Volume 5, Issue 7,   Pages 58-61

Abstract:

In order to confirm the dependence of the resistance of cavitation erosion and abrasion (CEA) on the common properties of materials, four typical materials (WC coating, NiCr alloy coating, boron stainless steel and titanium) were used to do the experiments of CEA and cavitation erosion (CE), to do corrosive experiment, and to test their hardnesses. The experiments results indicated that all resistance to CEA and resistance to CE depend on the hardness and the corrosive resistance of materials. The high hardness is the first factor of good resistance to CEA, strong corrosive resistance is the second factor. Meanwhile, the strong corrosive resistance is the first factor of good resistance to CE, high hardness is the second factor.

Keywords： hydraulic machine´     s materials     cavitation erosion and abrasion     theorem    

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Classical state feedback controller for nonlinear systems using mean value theorem: closed loop-FOC of

Abrar ALLAG,Abdelhamid BENAKCHA,Meriem ALLAG,Ismail ZEIN,Mohamed Yacine AYAD

Frontiers in Energy 2015, Volume 9, Issue 4,   Pages 413-425 doi: 10.1007/s11708-015-0379-1

Abstract: The problem of state feedback controllers for a class of Takagi-Sugeno (T-S) Lipschitz nonlinear systemssystematic and useful synthesis method is proposed based on the use of the differential mean value theoremThe proposed design approach is based on the mean value theorem (MVT) to express the nonlinear error

Keywords： Takagi-Sugeno (T-S) fuzzy systems     sector nonlinearity     nonlinear controller     linear matrix inequality (LMI) approach     differential mean value theorem (DMVT)     field oriented control (FOC)     linear parameter varying    

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Both-Branch Fuzzy Decision and Problems on Decision Discernment

Shi Kaiquan,Li Qiqiang

Strategic Study of CAE 2001, Volume 3, Issue 1,   Pages 71-77

Abstract: In addition, the paper proposes decision judgement theorem, decision discernment theorem, decision surplusage-discardingtheorem and hole-digging principle on decision factors universe X.

Keywords： both-branch fuzzy decision     decision model     judgement theorem     discernment theorem     surplusage-discardingtheorem     hole-digging principle    

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Application of consistent geometric decomposition theorem to dynamic finite element of 3D composite beam

Iman FATTAHI, Hamid Reza MIRDAMADI, Hamid ABDOLLAHI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3,   Pages 675-689 doi: 10.1007/s11709-020-0625-4

Abstract: decomposed into cross-sectional and longitudinal components, called consistent geometric decomposition theoremFurthermore, from the viewpoint of consistent geometric decomposition theorem, the transformation and

Keywords： composite beam     dynamic finite element     degrees of freedom coupling     experimental validation     numerical validation    

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The Generating Lock P<G，X，X'>and Its Central Encrypting System

Shi Kaiquan,Chen Zexiong

Strategic Study of CAE 2000, Volume 2, Issue 2,   Pages 41-46

Abstract:

The conception of the generating lock  P <G ,X, X´> and the central encrypting system composed of P<G ,X, X´>with data generating technology are proposed in this paper[3〜6]. These systems include the generating lock P<G ,X, X´> and single-tooth central encrypting system, and the generating lock P <G ,X, X´> and multi-tooth central encrypting system. The single-tooth encrypting-decrypting algorithm multi-tooth encrypting-decrypting algorithm, multi-tooth static encrypting-decrypting algorithm, multi-tooth dynamic encrypting-decrypting algorithm as well as the structure character of central encrypting system are provided. The paper points out that arbitrary two persons A and B can choose irregular distributed positive integer sets, XA={x1, x2, …，xn}, XB ={x1,x2,…xm}, m≥4, n≥4, XA≠XB , respectively and complete their secret communication with P < G, X, X´>. The experiment result shows that the method proposed has good application character and security character.

Keywords： lock     the central encrypting system     multi-tooth encrypting-decrypting algorithm     P    X     X'     > existence theorem     digital signature uniqueness theorem    

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A survey of instantaneous poles for a class of two-degree-of-freedom spherical mechanisms

Soheil ZARKANDI

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 4,   Pages 344-353 doi: 10.1007/s11465-014-0320-z

Abstract: however, some of these great circles cannot be obtained by a direct application of Aronhold-Kennedy theorem

Keywords： spherical mechanisms     instantaneous poles     Aronhold-Kennedy theorem     great circles     pencil of meridian    

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Upper bound solution to seismic active earth pressure of submerged backfill subjected to partial drainage

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6,   Pages 1480-1493 doi: 10.1007/s11709-021-0776-y

Abstract: the expressions of the seismic active earth thrust and pressure are derived by using the upper bound theorem

Keywords： seismic active earth pressure     partial seepage flow     pore pressure     anisotropy     upper bound theorem    

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Range estimation based on symmetry polynomial aided Chinese remainder theorem for multiple targets in Research Articles

Chenghu CAO, Yongbo ZHAO,ybzhao@xidian.edu.cn

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 2,   Pages 304-316 doi: 10.1631/FITEE.2000418

Abstract: correspondence between the target range and measured range, especially using the Chinese remainder theorem

Keywords： Range ambiguity     Erroneous range     Multiple targets     Symmetry polynomial aided Chinese remainder theorem    

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Observer design for induction motor: an approach based on the mean value theorem

Mohamed Yacine HAMMOUDI,Abdelkarim ALLAG,Mohamed BECHERIF,Mohamed BENBOUZID,Hamza ALLOUI

Frontiers in Energy 2014, Volume 8, Issue 4,   Pages 426-433 doi: 10.1007/s11708-014-0314-x

Abstract: for the induction motor into the linear parametric varying (LPV) system, the differential mean value theorem

Keywords： observer design     differential mean value theorem (DMVT)     sector nonlinearity transformation     linear matrix    

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Society for Neuroscience's 49th Annualmeeting

Conference Date: 19 Oct 2019

Conference Place: 美国/伊利诺斯/芝加哥

Administered by: 美国神经科学学会

Probabilistic stability of uncertain composite plates and stochastic irregularity in their buckling mode shapes: A semi-analytical non-intrusive approach

Frontiers of Structural and Civil Engineering   Pages 179-190 doi: 10.1007/s11709-022-0888-z

Abstract: In this study, the mechanical properties of the composite plate were considered Gaussian random fields and their effects on the buckling load and corresponding mode shapes were studied by developing a semi-analytical non-intrusive approach. The random fields were decomposed by the Karhunen−Loève method. The strains were defined based on the assumptions of the first-order and higher-order shear-deformation theories. Stochastic equations of motion were extracted using Euler–Lagrange equations. The probabilistic response space was obtained by employing the non-intrusive polynomial chaos method. Finally, the effect of spatially varying stochastic properties on the critical load of the plate and the irregularity of buckling mode shapes and their sequences were studied for the first time. Our findings showed that different shear deformation plate theories could significantly influence the reliability of thicker plates under compressive loading. It is suggested that a linear relationship exists between the mechanical properties’ variation coefficient and critical loads’ variation coefficient. Also, in modeling the plate properties as random fields, a significant stochastic irregularity is obtained in buckling mode shapes, which is crucial in practical applications.

Keywords： uncertain composite plate     stochastic assume mode method     Karhunen−Loève theorem     polynomial chaos approach    

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’s Best Papers of 2015

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 4, doi: 10.1007/s11783-016-0858-6

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Anion-exchange membrane direct ethanol fuel cells: Status and perspective

T.S. Zhao, Y.S. Li, S.Y. Shen

Frontiers in Energy 2010, Volume 4, Issue 4,   Pages 443-458 doi: 10.1007/s11708-010-0127-5

Abstract: Direct ethanol fuel cells (DEFCs) are a promising carbon-neutral and sustainable power source for portable, mobile, and stationary applications. However, conventional DEFCs that use acid proton-exchange membranes (typically Nafion type) and platinum-based catalysts exhibit low performance (i.e., the state-of-the-art peak power density is 79.5 mW/cm at 90°C). Anion-exchange membrane (AEM) DEFCs that use low-cost AEM and non-platinum catalysts have recently been demonstrated to yield a much better performance (i.e., the state-of-the-art peak power density is 160 mW/cm at 80°C). This paper provides a comprehensive review of past research on the development of AEM DEFCs, including the aspects of catalysts, AEMs, and single-cell design and performance. Current and future research challenges are identified along with potential strategies to overcome them.

Keywords： fuel cell     direct ethanol fuel cells     anion-exchange membrane     ethanol oxidation reaction     oxygen reduction reaction     cell performance    

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Title Author Date Type Operation

A new fracture criterion for peridynamic and dual-horizon peridynamics

Jinhai ZHAO, Hesheng TANG, Songtao XUE

Journal Article

The Theorem of the Resistance of Hydraulic Machine's Materials to Cavitation Erosion and Abrasion

Wang Biao,Wang Yudong,Zhang Zihua,Ye Xianguo

Journal Article

Classical state feedback controller for nonlinear systems using mean value theorem: closed loop-FOC of

Abrar ALLAG,Abdelhamid BENAKCHA,Meriem ALLAG,Ismail ZEIN,Mohamed Yacine AYAD

Journal Article

Both-Branch Fuzzy Decision and Problems on Decision Discernment

Shi Kaiquan,Li Qiqiang

Journal Article

Application of consistent geometric decomposition theorem to dynamic finite element of 3D composite beam

Iman FATTAHI, Hamid Reza MIRDAMADI, Hamid ABDOLLAHI

Journal Article

The Generating Lock P<G，X，X'>and Its Central Encrypting System

Shi Kaiquan,Chen Zexiong

Journal Article

A survey of instantaneous poles for a class of two-degree-of-freedom spherical mechanisms

Soheil ZARKANDI

Journal Article

Upper bound solution to seismic active earth pressure of submerged backfill subjected to partial drainage

Journal Article

Range estimation based on symmetry polynomial aided Chinese remainder theorem for multiple targets in

Chenghu CAO, Yongbo ZHAO,ybzhao@xidian.edu.cn

Journal Article

Observer design for induction motor: an approach based on the mean value theorem

Mohamed Yacine HAMMOUDI,Abdelkarim ALLAG,Mohamed BECHERIF,Mohamed BENBOUZID,Hamza ALLOUI

Journal Article

Society for Neuroscience's 49th Annualmeeting

19 Oct 2019

Conference Information

The RTS,S/AS01 malaria vaccine(English)

16 Jan 2024

Conference Videos

Probabilistic stability of uncertain composite plates and stochastic irregularity in their buckling mode shapes: A semi-analytical non-intrusive approach

Journal Article

’s Best Papers of 2015

Journal Article

Anion-exchange membrane direct ethanol fuel cells: Status and perspective

T.S. Zhao, Y.S. Li, S.Y. Shen

Journal Article