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Auteur : Grafiati
Publié le 10 mars 2023

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1

Saetta, Anna, Roberto Scotta et Renato Vitaliani. « Coupled Environmental-Mechanical Damage Model of RC Structures ». Journal of Engineering Mechanics 125, no 8 (août 1999) : 930–40. http://dx.doi.org/10.1061/(asce)0733-9399(1999)125:8(930).

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2

Xu, X. L., et M. Karakus. « A coupled thermo-mechanical damage model for granite ». International Journal of Rock Mechanics and Mining Sciences 103 (mars 2018) : 195–204. http://dx.doi.org/10.1016/j.ijrmms.2018.01.030.

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3

Jia, Shan Po, et Wei Zhong Chen. « Study on Excavation-Induced Permeability Changes in Clay Stone ». Advanced Materials Research 243-249 (mai 2011) : 2548–51. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.2548.

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The mechanical and hydraulic behavior of clay in the excavation damaged zone (EDZ) around underground repository is relevant for the assessment of the safety of geotechnical barriers. By integrating Mohr-Coulomb criterion and damage mechanics considerations, an elasto-plastic damage model is established for clay stone. Based on laboratory and in site investigations, the hydro-mechanical coupled damage model and permeability healing model is developed by the fully coupled hydro-mechanical coupled model, which can predict permeability changes and fractures self-healing in EDZ. Considering the construction of connecting gallery of radioactive waste disposal in deep clay formation in Belgium, a finite element damage model for simulating shield tunneling is proposed. The variations of damage and permeability around the tunnel with time are analyzed in detail. The proposed model is able to effectively depict the main features of hydro-mechanical behaviors of Boom clay.
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4

FATHALIKHANI, MARZIYEH, et BEHROUZ GATMIRI. « COUPLED ANALYSIS OF DAMAGE IN MULTIPHASE MEDIA ». Journal of Multiscale Modelling 04, no 02 (juin 2012) : 1250008. http://dx.doi.org/10.1142/s1756973712500084.

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In this paper, the theoretical framework of a coupled thermo-hydro-mechanical damage model dedicated to non-isothermal unsaturated porous media is presented. The damage variable is a second-order tensor, and the model has been formulated in independent state variables. The approach combines thermodynamic and micromechanical theories. The behavior laws have been derived from a postulated expression of Helmholtz free energy. The damaged rigidities have been computed by applying the Principle of Equivalent Elastic Energy (PEEE). Internal length parameters have been introduced in the expressions of liquid water conductivity, to account for cracking effects on fluid flows. Damage has been assumed to have an isotropic influence on air and heat flows, through the inelastic component of volumetric strains. The damage model has been implemented in θ-Stock Finite Element program. Some numerical studies are conducted to the impact of the thermal and mechanical loading on the evaluation of response of the unsaturated bentonite, and investigation of model parameters effect on damage development.
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5

Shakiba, Maryam, Rashid K. Abu Al-Rub, Masoud K. Darabi, Taesun You, Eyad A. Masad et Dallas N. Little. « Continuum Coupled Moisture–Mechanical Damage Model for Asphalt Concrete ». Transportation Research Record : Journal of the Transportation Research Board 2372, no 1 (janvier 2013) : 72–82. http://dx.doi.org/10.3141/2372-09.

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6

Zhou, Hui, Kai Zhang et XiaTing Feng. « A coupled elasto-plastic-damage mechanical model for marble ». Science China Technological Sciences 54, S1 (17 novembre 2011) : 228–34. http://dx.doi.org/10.1007/s11431-011-4642-3.

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7

Yan, Wei, Wan Chun Li et Wei Wang. « Finite Element Model for Damage Detection in Three-Dimensional Cube Structures ». Advanced Materials Research 430-432 (janvier 2012) : 1468–71. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1468.

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Based on three-dimensional finite element method (FEM), an accurate electro-mechanical impedance (EMI) model for a damaged cube structure is established in the paper. The damages are simulated by the reduction in Young’s modulus in the certain area of the cube structure. A coupled structural system consisting of PZT patch, bond layer and host structure is taken into account. Both the effects of the damage severity and damage propagation on EMI signatures are then investigated. The numerical computation indicates that the present EMI model can be employed to detect the damages in the structures.
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8

Liu, Xiaoxiao, et Ming Liu. « Reliability model and probability analysis method for pitting corrosion under mechanical loading ». Anti-Corrosion Methods and Materials 66, no 5 (2 septembre 2019) : 529–36. http://dx.doi.org/10.1108/acmm-12-2018-2046.

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Purpose Corrosion is one of the common damage mechanisms in many engineering structures such as marine structures, petroleum pipelines, aerospace and nuclear reactor. However, the service performance of metal materials and structures is gradually degenerating with the increase of service life due to the rapid growth of corrosion damages. Thus, the coupled effects for corrosion damage in reliability analysis should be considered urgently. Then, the purpose of this paper is to develop the corrosion damage physical model and the corresponding reliability analysis methods, which consider the coupled effect of corrosion damage. Design/methodology/approach A failure physical model, considering the coupled effect of pitting growth, crack and crack propagation, is presented in this paper. Sequentially, the corrosion reliability with respect to pitting physical damage can be investigated. The presented pitting damage physical model is formulated as time-variant performance limit state functions, which include the crack transition, crack growth and fracture failure mechanics. The first-passage failure criterion is used to construct the corrosion reliability framework, involving in the pitting damage model with the increase of service life. Findings Results demonstrate that the multiplicative dimensional reduction (MDR) method behaves much better than FORM no matter in accuracy or efficiency. The proposed corrosion reliability method is applicable for dealing with the damage failure model of the structural pitting corrosion. Originality/value The MDR method is used to calculate the corrosion reliability index of a given structure with fewer function calls. Finally, an aeronautical metal material is used to demonstrate the efficiency and precision of the proposed corrosion reliability method when the failure physical model considering the coupled effects of mechanical stresses and corrosion environment is adopted.
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9

Xu, Jie, Jiawang Qu, Yufeng Gao et Ning Xu. « Study on the Elastoplastic Damage-Healing Coupled Constitutive Model of Mudstone ». Mathematical Problems in Engineering 2017 (2017) : 1–7. http://dx.doi.org/10.1155/2017/6431607.

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Under the effect of high ground stress and water-rock chemical interaction, the fractures in the damaged mudstone wound undergo a self-healing process and recover the physical and mechanical properties, which has a significant impact on the wall-rock’s stability of high level radioactive waste repository and the migration of radioactive nuclide. According to the general thermodynamics and continuum damage mechanics, an internal variable describing mudstone healing properties is introduced and an elastoplastic damage-healing model reflecting mudstone deformation, damage, and self-healing evolution is put forward. This model is used to simulate the triaxial compression test of mudstone under different confining pressures, whose simulated results are compared with the test data. It is indicated that the model could embody the main mechanical properties of mudstone with the healing effect in an effective way, and the healing part of the model has a great influence on the simulated results.
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10

Lin, Yun, Feng Gao, Keping Zhou, Rugao Gao et Hongquan Guo. « Mechanical Properties and Statistical Damage Constitutive Model of Rock under a Coupled Chemical-Mechanical Condition ». Geofluids 2019 (14 mai 2019) : 1–17. http://dx.doi.org/10.1155/2019/7349584.

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Chemical corrosion has a significant impact on the damage evolution behavior of rock. To investigate the mechanical damage evolution process of rock under a coupled chemical-mechanical (CM) condition, an improved statistical damage constitutive model was established using the Drucker-Prager (D-P) strength criterion and two-parameter Weibull distribution. The damage variable correction coefficient and chemical damage variable which was determined by porosity were also considered in the model. Moreover, a series of conventional triaxial compressive tests were carried out to investigate the mechanical properties of sandstone specimens under the effect of chemical corrosion. The relationship between rock mechanics properties and confining pressure was also explored to determine Weibull distribution parameters, including the shape parameter m and scale parameter F0. Then, the reliability of the damage constitutive model was verified based on experimental data. The results of this study are as follows: (i) the porosity of sandstone increased and the mechanical properties degraded after chemical corrosion; (ii) the relationships among the compressive strength, the peak axial strain, and confining pressures were linear, while the relationships among the elastic modulus, the residual strength, and confining pressures were exponential functions; and (iii) the improved statistical damage constitutive model was in good agreement with the testing curves with R2>0.98. It is hoped that the study can provide an alternative method to analyze the damage constitutive behavior of rock under a coupled chemical-mechanical condition.
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11

Zhou, Feng, et Guangxu Cheng. « A Coupled Plastic Damage Model for Concrete considering the Effect of Damage on Plastic Flow ». Mathematical Problems in Engineering 2015 (2015) : 1–13. http://dx.doi.org/10.1155/2015/867979.

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A coupled plastic damage model with two damage scalars is proposed to describe the nonlinear features of concrete. The constitutive formulations are developed by assuming that damage can be represented effectively in the material compliance tensor. Damage evolution law and plastic damage coupling are described using the framework of irreversible thermodynamics. The plasticity part is developed without using the effective stress concept. A plastic yield function based on the true stress is adopted with two hardening functions, one for tensile loading history and the other for compressive loading history. To couple the damage to the plasticity, the damage parameters are introduced into the plastic yield function by considering a reduction of the plastic hardening rate. The specific reduction factor is then deduced from the compliance tensor of the damaged material. Finally, the proposed model is applied to plain concrete. Comparison between the experimental data and the numerical simulations shows that the proposed model is able to describe the main features of the mechanical performances observed in concrete material under uniaxial, biaxial, and cyclic loadings.
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12

Gambarotta, Luigi. « Friction-damage coupled model for brittle materials ». Engineering Fracture Mechanics 71, no 4-6 (mars 2004) : 829–36. http://dx.doi.org/10.1016/s0013-7944(03)00020-1.

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13

Kawai, Masamichi. « Constitutive Model for Coupled Inelasticity and Damage. » Transactions of the Japan Society of Mechanical Engineers Series A 61, no 592 (1995) : 2684–92. http://dx.doi.org/10.1299/kikaia.61.2684.

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14

Zheng Li, Yundong Shou, Deping Guo et Filippo Berto. « A coupled elastoplastic damage model for brittle rocks : elastoplastic damage model for brittle rocks ». Frattura ed Integrità Strutturale 14, no 53 (11 juin 2020) : 446–56. http://dx.doi.org/10.3221/igf-esis.53.35.

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15

Wang, Susheng, et Weiya Xu. « A coupled elastoplastic anisotropic damage model for rock materials ». International Journal of Damage Mechanics 29, no 8 (12 mars 2020) : 1222–45. http://dx.doi.org/10.1177/1056789520904093.

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In this study, a rigorous constitutive model within the framework of thermodynamics is formulated to describe the coupling process between irreversible deformation and anisotropic damage of rock materials. The coupling effect is reflected based on the “two-surface” formulation. The plastic response is described by a yield function while the anisotropic damage is defined by a novel exponential damage criterion. In the proposed model, another feature lies in introducing parameters β and k in the proposed model to capture strain hardening/softening behaviors and brittle–ductile transition. The computational formulation scheme for the coupled model is deduced in detail by using return mapping algorithm. The validity of the coupled model is compared with the numerical simulation results and the experimental curves of the fine-grained sandstone, Beishan granite, and Jinping marble. The results indicate that the model can take into account the nonlinear mechanical behaviors of rock: coupling anisotropic damage and plasticity as well as brittle-ductile transition behaviors. Without loss of generality, the coupled model is versatile to describe the mechanical characteristics of rock materials.
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16

Hu, Xuelong, Ming Zhang, Xiangyang Zhang, Min Tu, Zhiqiang Yin, Haifeng Ma et Minke Duan. « A Coupled Elastoplastic Damage Dynamic Model for Rock ». Shock and Vibration 2021 (4 octobre 2021) : 1–10. http://dx.doi.org/10.1155/2021/5567019.

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Rock dynamic constitutive model plays an important role in understanding dynamic response and addressing rock dynamic problems. Based on elastoplastic mechanics and damage mechanics, a dynamic constitutive model of rock coupled with elastoplastic damage is established. In this model, unified strength theory is taken as the yield criterion; to reflect the different damage evolution law of rocks under tension and pressure conditions, the effective plastic strain and volumetric plastic strain are used to represent the compressive damage variable and the equivalent plastic strain is used to represent the tensile damage variable; the plastic hardening behavior and strain rate effect of rocks are characterized by piecewise function and dynamic increase factor function, respectively; Fortran language and LS-DYNA User-Defined Interface (Umat) are used to numerically implement the constitutive model; the constitutive model is verified by three classical examples of rock uniaxial and triaxial compression tests, rock uniaxial tensile test, and rock ballistic test. The results show that the constitutive model can describe the dynamic and static mechanical behavior of rock comprehensively.
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Cao, Trong Son, Christian Bobadilla, Pierre Montmitonnet et Pierre Olivier Bouchard. « On the Development and Identification of Phenomenological Damage Models - Application to Industrial Wire Drawing and Rolling Processes ». Key Engineering Materials 554-557 (juin 2013) : 213–26. http://dx.doi.org/10.4028/www.scientific.net/kem.554-557.213.

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The continuum thermodynamics-based Lemaitre damage model is nowadays widely used to deal with coupled damage analyses for various mechanical applications (e.g. forming process simulations). However, such a model, which only accounts for the stress triaxiality (the ratio between the first and the second invariants of stress tensor) has been found to give incorrect results under shear dominated loading (in terms of damage location as well as risk of crack). Several recent studies have demonstrated the importance of the third stress invariant in damage prediction; the Lode angle parameter is generally used to include it. The idea is to describe completely the stress state in damage model’s formulations, which is defined by the equivalent stress, the stress triaxiality ratio and the Lode angle parameter. This later parameter has proved to have an important influence on ductile damage under low stress triaxiality. Xue’s coupled damage model accounts for the third invariant of the deviatoric stress tensor, allowing a better balance between respective effects of shear and elongation on damage. Some extensions of more physically based damage models, such as the Gurson-Tvergaard-Needleman model, have also been presented to account for this influence of the third stress invariant. In the present work, the phenomenological damage models have been implemented in Forge® Finite Element (FE) software to investigate ductile damage occurring during industrial forming processes. This paper presents the comparative study of Xue’s model and Lemaitre’s model. A complete procedure is detailed to identify the material and damage parameters from experimental mechanical tests on high carbon steel. This identification process has been carried out both for Lemaitre’s coupled damage model and Xue’s coupled damage model. Application to wire drawing followed by flat rolling shows that in such shear-inducing processes, these models predict damage at different locations, due to their different emphasis on shear with respect to elongational strain damage.
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18

Liu, Chang-chun, He-xiang Lü et Ping Guan. « Coupled viscoplasticity damage constitutive model for concrete materials ». Applied Mathematics and Mechanics 28, no 9 (septembre 2007) : 1145–52. http://dx.doi.org/10.1007/s10483-007-0902-x.

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19

Salari, M. R., S. Saeb, K. J. Willam, S. J. Patchet et R. C. Carrasco. « A coupled elastoplastic damage model for geomaterials ». Computer Methods in Applied Mechanics and Engineering 193, no 27-29 (juillet 2004) : 2625–43. http://dx.doi.org/10.1016/j.cma.2003.11.013.

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KAWAI, Masamichi, et Masahiro MORISHITA. « Damage-Coupled Constitutive Model for Metal Matrix Composites. » Transactions of the Japan Society of Mechanical Engineers Series A 62, no 597 (1996) : 1180–88. http://dx.doi.org/10.1299/kikaia.62.1180.

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Ireman, Peter, Anders Klarbring et Niclas Strömberg. « A model of damage coupled to wear ». International Journal of Solids and Structures 40, no 12 (juin 2003) : 2957–74. http://dx.doi.org/10.1016/s0020-7683(03)00121-5.

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Li, Rong Tao. « Coupled Damage and Plasticity Modeling in Failure Analysis of Heated Concrete ». Advanced Materials Research 671-674 (mars 2013) : 1531–34. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.1531.

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A coupled elastoplastic-damage constitutive model with consideration of chemo-induced material elastoplastic-damage effects due to heating concrete is proposed. A consistent return mapping algorithm for the integration of the rate coupled constitutive equations is developed. Consistent tangent modulus matrices for coupled chemo-thermo-hygro-mechanical analysis are derived to preserve the quadratic rate of convergence of the global Newton iterative procedure. Numerical results demonstrate the validity of the presented algorithm and illustrate the performance of the proposed constitutive model in reproducing coupled chemo-thermo-hygro-mechanical behavior in concretes subjected to fire.
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Millen, S. L. J., A. Murphy, G. Catalanotti et G. Abdelal. « Coupled Thermal-Mechanical Progressive Damage Model with Strain and Heating Rate Effects for Lightning Strike Damage Assessment ». Applied Composite Materials 26, no 5-6 (11 novembre 2019) : 1437–59. http://dx.doi.org/10.1007/s10443-019-09789-z.

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AbstractThis paper proposes a progressive damage model incorporating strain and heating rate effects for the prediction of composite specimen damage resulting from simulated lightning strike test conditions. A mature and robust customised failure model has been developed. The method used a scaling factor approach and non-linear degradation models from published works to modify the material moduli, strength and stiffness properties to reflect the effects of combined strain and thermal loading. Hashin/Puck failure criteria was used prior to progressive damage modelling of the material. Each component of the method was benchmarked against appropriate literature. A three stage modelling framework was demonstrated where an initial plasma model predicts specimen surface loads (electrical, thermal, pressure); a coupled thermal-electric model predicts specimen temperature resulting from the electrical load; and a third, dynamic, coupled temperature-displacement, explicit model predicts the material state due to the thermal load, the resulting thermal-expansion and the lightning plasma applied pressure loading. Unprotected specimen damage results were presented for two SAE lightning test Waveforms (B & A); with the results illustrating how thermal and mechanical damage behaviour varied with waveform duration and peak current.
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Ghassemieh, Mehdi, Moein Rezapour et Vahid Sadeghi. « Effectiveness of the shape memory alloy reinforcement in concrete coupled shear walls ». Journal of Intelligent Material Systems and Structures 28, no 5 (28 juillet 2016) : 640–52. http://dx.doi.org/10.1177/1045389x16657200.

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The use of shape memory alloys as a rebar in concrete structures has been receiving increasing attention among researchers. In this study, it is intended to evaluate the application of superelastic Nitinol in reducing the damage to the coupling beams and opening corners within a concrete shear wall. Abaqus finite element software was utilized to develop three verified coupled shear wall models. First, a model without diagonal and shape memory alloy rebars is developed to assess conventional shear walls with openings. Steel diagonal rebars are embedded in the coupling beams of the second model, and shape memory alloy diagonal rebars are embedded in the coupling beams of the third model. Shape memory alloy is also implemented in the opening corners of the third model. All models are subjected to cyclic loading to evaluate the concrete damage. Results indicated that the diagonal rebars reduced damage to the coupling beam and opening corners. The damages were the least when shape memory alloy diagonal rebars are utilized in the model. The superelastic behavior of the shape memory alloy also reduced permanent displacement of the shear wall subjected to substantial lateral loadings.
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Wei, Shan, Yang Tao, Guo Ying, Xu Zhichao et Zhang Chengcheng. « Establishment and Experimental Verification of Stress-Temperature Coupled Damage Model of Warm Frozen Soil ». Geofluids 2022 (27 février 2022) : 1–15. http://dx.doi.org/10.1155/2022/5101425.

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Under the background of rising environmental temperature, the state of warm frozen soil near the phase transition is extremely unstable. In order to explore the relationship between temperature and mechanical properties of warm frozen soil, a damage model of warm frozen soil structure under the coupling of stress and temperature is established based on the strain equivalent theory of damage mechanics. Based on the Mohr-Coulomb criterion, the nominal stress is used to represent the stress damage of frozen soil elements, the initial elastic modulus is used to represent the temperature damage, and a composite damage factor is introduced to describe their coupled relationship. Through a triaxial compression experiment of frozen soil, the experimental data and stress-strain curve are obtained. The full-fitting method based on the experimental data (method 1) and the semitheoretical semifitting method based on the characteristic points of the stress-strain curve (method 2) are used to obtain the shape parameters and scale parameters of the stress-temperature coupled damage model corresponding to different fitting methods. Based on the triaxial compression tests of frozen sand and frozen silty clay, the reliability of the stress-temperature coupled damage model results obtained by the two parameter determination methods under the conditions of strain softening and strain hardening is verified. The results show that both methods are applicable under the condition of strain softening and strain hardening and method 2 is better than method 1 under the condition of strain softening. Compared with the prediction results of the single stress damage model, the stress-temperature coupled damage model can effectively reduce the influence of the parameter estimation error on the results and improve the overall stability of the model.
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Li, Zhong-you, et Yuan-xue Liu. « Coupled thermo-hygro-mechanical damage model for concrete subjected to high temperatures ». Applied Mathematics and Mechanics 33, no 4 (avril 2012) : 465–82. http://dx.doi.org/10.1007/s10483-012-1564-x.

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Jiang, Annan, Xiurong Yang, Mengfei Xu et Tengfei Jiang. « Coupled Hydrologic-Mechanical-Damage Analysis and Its Application to Diversion Tunnels of Hydropower Station ». Advances in Civil Engineering 2021 (24 février 2021) : 1–17. http://dx.doi.org/10.1155/2021/8341528.

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Since the traditional model cannot sufficiently reflect the multifield coupling problem, this paper established an elastoplastic stress-seepage-damage analysis model considering the seepage field, stress field, and damage field. Simultaneously, the elastoplastic damage model involves many parameters and is difficult to determine. An inverse analysis program is compiled based on the differential evolution algorithm, and the surrounding rock damage parameters are inverted. Finally, the elastoplastic stress-seepage-damage coupling program and the damage parameter displacement back analysis program is compiled using C++ language. Then, the program is used to calculate the coupling problem of tunnel elastoplastic stress-seepage-damage. The results show that the proposed elastoplastic damage constitutive model can well describe the mechanical behavior of rock. The computational procedure can also simulate practical engineering problems, which can provide specific guidance for site construction.
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Du, Peng, Yan Yao, Ling Wang et Yin Cao. « Mechanical Damage Model of Concrete Subject to Freeze-Thaw Cycles Coupled with Bending Stress and Chloride Attack ». Advanced Materials Research 936 (juin 2014) : 1342–50. http://dx.doi.org/10.4028/www.scientific.net/amr.936.1342.

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As the action mechanisms of various factors affecting concrete durability are different, it is difficult to understand the durability of concrete exposed to multiple factors using only mechanism analysis. Converting each action mechanism to an appropriate macroscopic mechanical effect can simplify complicated durability problems. Here we study concrete beams exposed to common environmental factors: cyclic freezing and thawing, bending stress and chloride attack. By converting each mechanism into a mechanical process and analyzing its effect on concrete, a damage model based on strain was established. Freezing-induced tensile stress is essentially a low-cycle fatigue tensile stress, as represented by a saw-tooth model. The maximum strains when the maximum freezing-induced tensile stress coupled with the four-point bending stress in every freeze-thaw cycle were measured, and found to increase with freeze-thaw cycling. Our damage model provides a new approach to predict the service life of concrete, and guidance for durability design of concrete.
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Wei, Chenhui, Wancheng Zhu, Shikuo Chen et Pathegama Ranjith. « A Coupled Thermal–Hydrological–Mechanical Damage Model and Its Numerical Simulations of Damage Evolution in APSE ». Materials 9, no 11 (31 octobre 2016) : 841. http://dx.doi.org/10.3390/ma9110841.

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Xinhua, Xue, Zhang Wohua et Xingguo Yang. « Study on constitutive model of coupled damage-permeability of porous media ». International Journal of Numerical Methods for Heat & ; Fluid Flow 24, no 2 (25 février 2014) : 359–75. http://dx.doi.org/10.1108/hff-04-2012-0086.

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Purpose – The paper aims to clarify the relationship between the micro-structures of porous media and the coefficient of permeability. Most materials involve different types of defects like caves, pores and cracks, which are important characters of porous media and have a great influence on the physical properties of materials. To study the seepage mechanical characteristics of damaged porous media, the constitutive model of porous media dealing with coupled modeling of pores damage and its impact on permeability property of a deforming media was studied in this paper. Design/methodology/approach – The paper opted for an exploratory study using the approach of continuum damage mechanics (CDM). Findings – The paper provides some new insights on the fluid dynamics of porous media. The dynamic evolution model of permeability coefficient established in this paper can be used to model the fluid flow problems in damaged porous media. Moreover, the modified Darcy's law developed in this paper is considered to be an extension of the Darcy's law for fluid flow and seepage in a porous medium. Research limitations/implications – Owing to the limitations of time, conditions, funds, etc., the research results should be subject to multifaceted experiments before their innovative significance can be fully verified. Practical implications – The paper includes implications for the development of fluid dynamics of porous media. Originality/value – This paper fulfils an identified need to study the relationship between the micro-structures of porous media and the coefficient of permeability.
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Zhang, Yu, Lu Wang, Goangseup Zi et Yan Zhang. « Mechanical Behavior of Coupled Elastoplastic Damage of Clastic Sandstone of Different Burial Depths ». Energies 13, no 7 (2 avril 2020) : 1640. http://dx.doi.org/10.3390/en13071640.

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Clastic sandstone is widely distributed in oil and gas reservoirs; its internal structure has many micro-defects. Under different stress environments of burial depth, significant damage evolution and plastic deformation easily occur. A series of triaxial compression tests were performed to study the coupled elastoplastic damage mechanical behavior of clastic sandstone samples at different burial depths ranging from 581.28 m to 979.82 m. Results reveal that the stress-strain responses of clastic sandstone samples exhibit significant nonlinear and softening characteristics. The mechanical behavior is due to the coupling of plastic deformation and mechanical damage. Plastic and damage internal variables cause damage stiffness degradation and plastic flow. Considering the coupling of elastoplastic damage in the loading process, an elastoplastic damage coupling model is proposed to study the mechanical behavior of different burial depth clastic sandstones. The model can effectively describe the mechanical behavior of clastic sandstone, such as the volume compression and dilatancy transformation, plastic hardening and damage softening, which are in good agreement with the experimental results. Furthermore, the mechanical behavior of the clastic sandstone shows a dependency on the confining pressure and burial depth. The load-bearing capacity and the ability to resist deformation of the clastic sandstone are improved as the confining pressure and burial depth increase. Relevant results can provide reliable basis for the safe exploitation of oil and gas engineering.
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Falkenberg, Rainer, Wolfgang Brocks, Wolfgang Dietzel et Ingo Schneider. « Simulation of Stress-Corrosion Cracking by the Cohesive Model ». Key Engineering Materials 417-418 (octobre 2009) : 329–32. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.329.

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The effect of hydrogen on the mechanical behaviour is twofold: It affects the local yield stress and it accelerates material damage. On the other hand, the diffusion behaviour is influenced by the hydrostatic stress, the plastic deformation and the strain rate. This requires a coupled model of deformation, damage and diffusion. The deformation behaviour is described by von Mises plasticity with pure isotropic hardening, and crack extension is simulated by a cohesive zone model. The local hydrogen concentration, which is obtained from the diffusion analysis, causes a reduction of the cohesive strength. Crack extension in a C(T) specimen of a ferritic steel under hydrogen charging is simulated by fully coupled diffusion and mechanical finite element analyses with ABAQUS and the results are compared with test results.
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Weitsman, Y. « Damage Coupled With Heat Conduction in Uniaxially Reinforced Composites ». Journal of Applied Mechanics 55, no 3 (1 septembre 1988) : 641–47. http://dx.doi.org/10.1115/1.3125842.

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This paper presents a continuum damage model for a unidirectionally reinforced composite based upon fundamental concepts of continuum mechanics and irreversible thermodynamics. Damage is incorporated by two symmetric, second-rank, tensor-valued, internal state variables which represent the total areas of “active” and “passive” cracks contained within a representative material volume element. Constitutive relations are derived for both the mechanical response and heat flux in the presence of damage. It is shown that damage growth contributes to dissipation in the coupled heat conduction process. A specific fracture mechanics solution is employed to relate “microlevel” crack growth processes to “macrolevel” damage growth expressions. This approach lends itself to a probabilistic formulation of the continuum damage model.
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Kawai, M. « Coupled Inelasticity and Damage Model for Metal Matrix Composites ». International Journal of Damage Mechanics 6, no 4 (octobre 1997) : 453–78. http://dx.doi.org/10.1177/105678959700600405.

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35

Zhang, Ning, Xiru Li, Hongmei Cheng et Teng Teng. « A coupled damage-hydro-mechanical model for gas drainage in low-permeability coalbeds ». Journal of Natural Gas Science and Engineering 35 (septembre 2016) : 1032–43. http://dx.doi.org/10.1016/j.jngse.2016.09.050.

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Bary, Benoît, Guillaume Ranc, Sabine Durand et Olivier Carpentier. « A coupled thermo-hydro-mechanical-damage model for concrete subjected to moderate temperatures ». International Journal of Heat and Mass Transfer 51, no 11-12 (juin 2008) : 2847–62. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2007.09.021.

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Nasri, Mohamed Toumi, Slimani Faouzi, A. Ayadi, Abel Cherouat, Mohamed Ali Rezgui et Ali Zghal. « Inverse Identification Method to Characterize the Behavior of Coupled Elasto-Plastic Coupled to Damage Model Using Modified Erichsen Test ». Advanced Materials Research 698 (mai 2013) : 21–28. http://dx.doi.org/10.4028/www.scientific.net/amr.698.21.

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This study presents experimental and numerical approaches to study the thermo-elasto-plastic behavior coupled to ductile damage of thin sheet. The study highlights the influence of temperature on the mechanical properties affecting the ability of forming aluminum sheet 1050A. The properties of the Swifts model hardening coupled to isotropic ductile damage variable and the Erichsen Index are obtained using inverse approach (Nelder-Mead method). The obtained results have established a correlation between the Index Erichsen formability of the material.
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Ibrahimbegovic, Adnan, Pierre Jehel et Luc Davenne. « Coupled damage-plasticity constitutive model and direct stress interpolation ». Computational Mechanics 42, no 1 (12 décembre 2007) : 1–11. http://dx.doi.org/10.1007/s00466-007-0230-6.

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Pazdniakou, Aliaksei, et Magdalena Dymitrowska. « Migration of Gas in Water Saturated Clays by Coupled Hydraulic-Mechanical Model ». Geofluids 2018 (2018) : 1–25. http://dx.doi.org/10.1155/2018/6873298.

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Understanding the gas migration in highly water saturated sedimentary rock formations is of great importance for safety of radioactive waste repositories which may use these host rocks as barrier. Recent experiments on drainage in argillite samples have demonstrated that they cannot be represented in terms of standard two-phase flow Darcy model. It has been suggested that gas flows along highly localized dilatant pathways. Due to very small pore size and the opacity of the material, it is not possible to observe this two-phase flow directly. In order to better understand the gas transport, a numerical coupled hydraulic-mechanical model at the pore scale is proposed. The model is formulated in terms of Smoothed Particle Hydrodynamics (SPH) and is applied to simulate drainage within a sample reconstructed from the Focused Ion Beam (FIB) images of Callovo-Oxfordian claystone. A damage model is incorporated to take into account the degradation of elastic solid properties due to local conditions, which may lead to formation of new pathways and thus to modifications of fluid transport. The influence of the damage model as well as the possible importance of rigid inclusions is demonstrated and discussed.
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Toti, J., S. Marfia et E. Sacco. « Coupled body-interface nonlocal damage model for FRP detachment ». Computer Methods in Applied Mechanics and Engineering 260 (juin 2013) : 1–23. http://dx.doi.org/10.1016/j.cma.2013.03.010.

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Ren, Xiaodan, Qing Wang, Roberto Ballarini et Xiangling Gao. « Coupled Creep-Damage-Plasticity Model for Concrete under Long-Term Loading ». Journal of Engineering Mechanics 146, no 5 (mai 2020) : 04020027. http://dx.doi.org/10.1061/(asce)em.1943-7889.0001748.

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Buethe, Inka, et Claus Peter Fritzen. « Sensor Performance Assessment Based on a Physical Model and Impedance Measurements ». Key Engineering Materials 569-570 (juillet 2013) : 751–58. http://dx.doi.org/10.4028/www.scientific.net/kem.569-570.751.

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The employment of a large number of embedded sensors in advanced monitoring systems becomes more common, enabling in-service detection, localization and assessment of defects in mechanical, civil and aerospace structures. These sensors could be optical fibre sensors, accelerometers, strain gauges or piezoelectric wafer active sensors (PWAS). As the latter are quite popular, due to its multipurpose application as actuators and sensors and its low cost, this type will be investigated. Within this paper a possible approach of sensor performance is presented. The method uses the coupled electro-mechanical admittance to detect damage of the PWAS and its bonding layer. The help of a temperature dependent theoretical model provides for influences of changing environmental and operational conditions. The model will be compared with FEM-results, before showing the successful application on experimental results.
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Chen, Shikuo, Chenhui Wei, Tianhong Yang, Wancheng Zhu, Honglei Liu et Pathegama Ranjith. « Three-Dimensional Numerical Investigation of Coupled Flow-Stress-Damage Failure Process in Heterogeneous Poroelastic Rocks ». Energies 11, no 8 (24 juillet 2018) : 1923. http://dx.doi.org/10.3390/en11081923.

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The failure mechanism of heterogeneous rocks (geological materials), especially under hydraulic conditions, is important in geological engineering. The coupled mechanism of flow-stress-damage should be determined for the stability of rock mass engineering under triaxial stress states. Based on poroelasticity and damage theory, a three-dimensional coupled model of the flow-stress-damage failure process is studied, focusing mainly on the coupled characteristics of permeability evolution and damage in nonhomogeneous rocks. The influences of numerous mesoscale mechanical and hydraulic properties, including homogeneity, residual strength coefficient, loading rates, and strength criteria, on the macro mechanical response are analyzed. Results reveal that the stress sensitive factor and damage coefficient are key variables for controlling the progress of permeability evolution, and these can reflect the hydraulic properties under pre-peak and post-peak separately. Moreover, several experiments are conducted to evaluate the method in terms of permeability evolution and failure process and to verify the proposed two-stage permeability evolution model. This model can be used to illustrate the failure mechanics under hydraulic conditions and match different rock types. The relation of permeability with strain can also help confirm appropriate rock mass hydraulic parameters, thereby enhancing our understanding of the coupled failure mechanism in rock mass engineering.
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Jefferson, Anthony, Tharmesh Selvarajoo, Brubeck Freeman et Robert Davies. « An experimental and numerical study on vascular self-healing cementitious materials ». MATEC Web of Conferences 289 (2019) : 01004. http://dx.doi.org/10.1051/matecconf/201928901004.

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This paper gives an overview of a combined experimental-numerical study on vascular self-healing (SH) systems for cementitious composite materials. The work aimed to bridge the gap between numerical and experimental investigations for this type of SH system and to provide a set of data for developing, calibrating and validating a finite element model for these materials. The study investigated both healing-agent transport and mechanical damage-healing processes, including healing-agent curing. The experimental programme included mechanical tests on notched concrete beams and compact direct-tension specimens with inbuilt vascular healing systems, as well as tests to measure the transport properties of healing-agent within discrete concrete cracks and through the concrete matrix. The new coupled model employs elements with embedded strong discontinuities to simulate cracks and mechanical healing behaviour. A damage-healing constitutive model is described that simulates multiple damage-healing ‘events’. This mechanical model is coupled to discrete and continuum flow models that simulate healing-agent transport. The transport model accounts for pressurised and capillary flow, as well as curing-dependent flow properties. The main focus of this contribution is to show how these parallel programmes of work were combined so that the experimental observations guided the numerical developments and modelling questions were answered using experimental findings.
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Feng, Xiaowei, Wei Wang, Shuangshuang Yuan, Rubin Wang, Qizhi Zhu et Jin Yu. « A coupled elastoplastic damage model for sandstone considering chemical corrosion ». European Journal of Environmental and Civil Engineering 22, sup1 (février 2018) : s302—s315. http://dx.doi.org/10.1080/19648189.2018.1429320.

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Xue, Yi, Zhengzheng Cao, Faning Dang, Songhe Wang, Mingming He et Feng Du. « Effect of damage on gas seepage mechanism in coal seam based on a coupled model ». Thermal Science 23, no 3 Part A (2019) : 1323–28. http://dx.doi.org/10.2298/tsci180319129x.

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Damage has a significant impact on gas migration in coal seam. In this paper, a coupled hydraulic-mechanical-damage model is established, which takes into account the coupling relationship among coal damage, gas seepage and coal deformation. The simulation results show that the damage of coal body has little effect on seepage characteristic in the initial stage, but the influence of damage on gas seepage is increasing with the increase of time. Both the distribution of gas pressure and the gas adsorption content of coal body have a significant change.
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47

Zhu, Shengyang, Jun Luo, Mingze Wang et Chengbiao Cai. « Mechanical characteristic variation of ballastless track in high-speed railway : effect of train–track interaction and environment loads ». Railway Engineering Science 28, no 4 (30 novembre 2020) : 408–23. http://dx.doi.org/10.1007/s40534-020-00227-6.

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AbstractDue to the fact that ballastless tracks in high-speed railways are not only subjected to repeated train–track dynamic interaction loads, but also suffer from complex environmental loads, the fundamental understanding of mechanical performance of ballastless tracks under sophisticated service conditions is an increasingly demanding and challenging issue in high-speed railway networks. This work aims to reveal the effect of train–track interaction and environment loads on the mechanical characteristic variation of ballastless tracks in high-speed railways, particularly focusing on the typical interface damage evolution between track layers. To this end, a finite element model of a double-block ballastless track involving the cohesive zone model for the track interface is first established to analyze the mechanical properties of the track interface under the loading–unloading processes of the negative temperature gradient load (TGL) followed by the same cycle of the positive TGL. Subsequently, the effect of wheel–rail longitudinal interactions on the nonlinear dynamic characteristics of the track interface is investigated by using a vehicle-slab track vertical-longitudinal coupled dynamics model. Finally, the influence of dynamic water pressure induced by vehicle dynamic load on the mechanical characteristics and damage evolution of the track interface is elucidated using a fluid–solid coupling method. Results show that the loading history of the positive and negative TGLs has a great impact on the nonlinear development and distribution of the track interface stress and damage; the interface damage could be induced by the wheel–rail longitudinal vibrations at a high vehicle running speed owing to the dynamic amplification effect caused by short wave irregularities; the vehicle dynamic load could produce considerable water pressure that presents nonlinear spatial–temporal characteristics at the track interface, which would lead to the interface failure under a certain condition due to the coupled dynamic effect of vehicle load and water pressure.
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Chow, Chi L., Jianghui Mao et Jie Shen. « Nonlocal Damage Gradient Model for Fracture Characterization of Aluminum Alloy ». International Journal of Damage Mechanics 20, no 7 (10 janvier 2011) : 1073–93. http://dx.doi.org/10.1177/1056789510395364.

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This article presents the development of a generalized nonlocal damage-coupled material model. The model introduces the concept of cumulative damage gradient through a set of damage evolution equations within the irreversible thermodynamics framework. The conventional damage-coupled plasticity models require either self-developed finite element codes or the mandatory use of regular elements. The proposed material model is implemented in a commercial finite element code ABAQUS (Version 6.5) via its UMAT subroutine. The implementation of this model on ABAQUS is described with a focus on the nonlocal treatment together with the derivation of the consistent tangent modulus (Jacobian). As a numerical example, the nonlocal damage model is applied to center-cracked specimen made of aluminum alloy 2024-T3. Comparison is made between the computed results and experimental ones. The validity of the proposed model is examined, and its effectiveness for engineering application is elucidated.
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Zhao, A. H., et C. L. Chow. « Computational Algorithms for a Damage-coupled Cyclic Viscoplasticity Material Model ». International Journal of Damage Mechanics 18, no 6 (24 septembre 2008) : 507–32. http://dx.doi.org/10.1177/1056789508090748.

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Xinran Xiao. « A Coupled Damage-plasticity Model for Energy Absorption in Composite ». International Journal of Damage Mechanics 19, no 6 (31 mars 2009) : 727–51. http://dx.doi.org/10.1177/1056789508101201.

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