Готові списки джерел за темами / Damage-induced orthotropy

Добірка наукової літератури з теми "Damage-induced orthotropy"

Автор: Grafiati

Опубліковано: 14 березня 2023

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Статті в журналах з теми "Damage-induced orthotropy"

Arslan, Onur. "Frictional contact problem of an anisotropic laterally graded layer loaded by a sliding rigid stamp." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 10 (April 7, 2020): 2024–41. http://dx.doi.org/10.1177/0954406220916486.

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This study proposes analytical and computational methods for the solution of the sliding frictional contact problem of an anisotropic laterally graded layer loaded by an arbitrarily shaped rigid stamp. The plane-strain orthotropy prevails in the layer which is bonded to a rigid foundation. Each of four orthotropic stiffness coefficients is exponentially varied through the lateral direction of the elastic layer. The Fourier transformations of the field variables are employed in the formulation. The gradient of a displacement component on the surface is then converted to a singular integral equation of the second kind. The singular integral equation is solved by means of the Gauss–Jacobi quadrature integration techniques, a collocation method, and a recursive integration method for the Cauchy integral considering the flat and triangular stamp profiles. The finite element method solutions of the same contact problems are performed using the augmented Lagrange method which is implemented in virtue of ANSYS design parametric language. An iterative algorithm is additionally utilized for the (incomplete) triangular stamp problem to conveniently reach the solutions for predetermined contact lengths. The convergence and comparative analyses are carried out to elucidate the trustworthiness of the analytical and computational methods proposed. Moreover, the parametric analyses infer that the contact-induced damage risks can be effectively alleviated upon tuning the degree of orthotropy and the lateral heterogeneity of the elastic layer.

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Yang, Yun Hao, and Ren Kun Wang. "Study on Deformation and Damage of Rock Mass Subject to High In Situ Stress by Using a Elastoplastic Damage Model and Considering the Impact of Weak Planes." Advanced Materials Research 838-841 (November 2013): 705–9. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.705.

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Large scale underground caverns are under construction in high in-situ stress field at Houziyan hydropower station. To investigate deformation and damage of surrounding rock mass, a elastoplastic orthotropic damage model capable of describing induced orthotropic damage and post-peak behavior of hard rock is used, together with a effective approach accounting for the presence of weak planes. Then a displacement based back analysis was conducted by using the measured deformation data from extensometers. The computed displacements are in good agreement with the measured ones at most of measurement points, which confirm the validities of constitutive model and numerical simulation model. The result of simulation shows that damage of surrounding rock mass is mainly dominated by the high in-situ stress rather than the weak planes and heavy damage occur at the cavern shoulders and side walls.

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Olsen-Kettle, Louise. "Quantifying the orthotropic damage tensor for composites undergoing damage-induced anisotropy using ultrasonic investigations." Composite Structures 204 (November 2018): 701–11. http://dx.doi.org/10.1016/j.compstruct.2018.07.096.

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Welemane, Hélène, Cristina Goidescu, Djimédo Kondo, Olivier Pantalé, and Moussa Karama. "Brittle Damage in Initially Anisotropic Materials: A Model Accounting for the Induced Anisotropy and Unilateral Effects." Applied Mechanics and Materials 784 (August 2015): 173–78. http://dx.doi.org/10.4028/www.scientific.net/amm.784.173.

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Анотація:

A new micromechanical modelling approach for brittle damage in initially orthotropic materials is presented. The proposed strain-based energy formulation allows to derive a fully anisotropic multilinear model for microcracked materials with arbitrary oriented defects. The thermodynamics framework provides a standard procedure for the damage evolution law. The new model explicitly accounts for the interaction between primary and induced anisotropies. Moreover, the very challenging issue of opening-closure effects (unilateral behavior) is addressed in this framework.

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Cui, Chuang, You-Lin Xu, Qing-Hua Zhang, and Feng-Yang Wang. "Vehicle-induced fatigue damage prognosis of orthotropic steel decks of cable-stayed bridges." Engineering Structures 212 (June 2020): 110509. http://dx.doi.org/10.1016/j.engstruct.2020.110509.

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Garion, Cedric, and Blazej Skoczen. "Combined Model of Strain-Induced Phase Transformation and Orthotropic Damage in Ductile Materials at Cryogenic Temperatures." International Journal of Damage Mechanics 12, no. 4 (October 2003): 331–56. http://dx.doi.org/10.1177/105678903036225.

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Monchiet, Vincent, Cosmin Gruescu, Oana Cazacu, and Djimedo Kondo. "A micromechanical approach of crack-induced damage in orthotropic media: Application to a brittle matrix composite." Engineering Fracture Mechanics 83 (March 2012): 40–53. http://dx.doi.org/10.1016/j.engfracmech.2011.11.011.

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Zou, Shengquan, Dayong Han, Wei Wang, and Ran Cao. "Effect of Autonomous Vehicles on Fatigue Life of Orthotropic Steel Decks." Sensors 22, no. 23 (December 1, 2022): 9353. http://dx.doi.org/10.3390/s22239353.

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The fatigue life of orthotropic steel decks (OSDs) is significantly affected by vehicle loads, and the local stress response of OSDs is sensitive to the transverse position of vehicle loads. However, the presence of autonomous vehicles is likely to change the transverse distribution of vehicles within the lane, thereby affecting vehicle-induced fatigue damage to OSDs. Therefore, it is necessary to evaluate the potential effect of autonomous vehicles on the fatigue life of OSDs so that appropriate strategies can be implemented to control the transverse positions of autonomous vehicles passing the bridge deck. To this end, fatigue damages of several typical fatigue details in a conventional OSD (COSD) and a lightweight composite OSD (LWCD) induced by vehicle loads were calculated based on finite element analysis, and their fatigue lives were evaluated based on Miner’s Rule, in which different transverse distribution patterns of autonomous vehicles and their proportions in the mixed traffic flow were considered. The results indicate that fatigue lives of both the COSD and the LWCD can be negatively affected by autonomous vehicles traveling across the bridge without any constraints on the transverse distribution, especially when their proportion in the mixed traffic flow exceeds 30%. Compared to the scenario without autonomous vehicles, the fatigue damage of most fatigue details in OSDs may increase by 51% to 210% in the most unfavorable case due to the presence of autonomous vehicles. Nevertheless, it is feasible to extend the fatigue life of OSDs by optimizing the transverse distribution of autonomous vehicles. Specifically, the fatigue life of most fatigue details in the COSD could be extended by more than 86% in the most favorable case when a bimodal Gaussian distribution is adopted as the transverse distribution pattern of autonomous vehicles. Moreover, both the negative and positive effects of autonomous vehicles on the fatigue life of the COSD are more significant than those of the LWCD in most cases. The results can provide references for the maintenance of OSDs under the action of autonomous vehicles.

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Sun, Liangliang, Jihui Wang, Haixiao Hu, and Aiqing Ni. "A Simplified Computational Strategy Focused on Resin Damage to Study Matrix Cracking of The Cross-Ply Laminates Under Uniaxial Tension Load." Materials 12, no. 12 (June 20, 2019): 1984. http://dx.doi.org/10.3390/ma12121984.

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Transverse cracking is probably the first and most dominant mode of damage in composite materials. In this paper, transverse cracking of cross-ply [02/90n]s (n = 2,3,4) laminates under uniaxial tension load was studied by means of experimental and numerical methods. In the numerical simulations, a simplified computational strategy only focusing on the damage of the resin was proposed and the mechanical response of the cracking cross-ply laminates was studied by finite element analysis of multi-scale representative volume elements (RVEs). In the RVEs, the longitudinal 0° plies were represented by macro-scale, homogeneous, orthotropic elastic solids while the 90° plies were modeled by the discrete fibers and the surrounding matrix resin in micro-scale. Based on researching the critical longitudinal mechanical strain ε x which initiates the cracks, the in-situ transverse ply strength and the stiffness degradation of the transverse plies, the simplified computational strategy proposed was proven correct. In addition, the crack initiation is sensitive to residual stress. Higher process-induced residual stress levels are dangerous to laminates, leading to early crack initiation.

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Hoseiny, Masoud Askari, Reza Moghiseh-E, Amir Alinaghizadeh, Payam Soltani, and Vahid Majidi Hachesoo. "Experimental Investigation the Drill Bit Curve Radius & Chisel Point on Effect of Induced Damage in Drilling Woven GFRP." Advanced Materials Research 845 (December 2013): 819–30. http://dx.doi.org/10.4028/www.scientific.net/amr.845.819.

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The purpose of this study was to find experimentally the effects of concave and convex major cutting edge (Helical & Recon point) and chisel point on the drilling composite. Due to composite materials are natural orthotropic, so gradually these materials are substituted by some metals such as steel that are used in manufacturing automobile and aerospace and other industris. Because of increasing composites utilization in industries, it is necessary to stabilize and set standards of machining parameters. Drilling is the main machining operation in producing process for assembled the composite work piece. So the quality of drilling hole should be considered to avoid snapping mechanical structure. Tool geometry is one of the most important factors in the drilling process. If it is neglected, the thrust forced increase, and it causes damage around the hole such as delamination, large entrance and exit burr, and induced cracks. The most damaging in drilling FRP is delamination of the composites lamina that occurs when drill bit is entered and exited. In the other hand, this study used ANSYS finite element software to determine the value of stress in composite plate and use to analyze for designing the jig & fixture in this drilling process. In conclusion, with comparing delamination, the best geometry tool introduced for the lowest amount of damage.

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Тези доповідей конференцій з теми "Damage-induced orthotropy"

Fang, Heng, Nouman Iqbal, Amelie Outtier, Muhammad Kashif, and Hans De Backer. "Experimental study of rib distortion in orthotropic steel decks." In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.0704.

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<p>Longitudinal ribs with the trapezoidal section are broadly adopted in orthotropic steel decks especially for long span bridges. When the tire load is eccentric from the axis of the rib, the torsional rigidity of ribs is critically reduced by distortion which impedes the horizontal dispersal of load. Because of the existence of cutouts in crossbeam, the high stress concentration at the rib-to-crossbeam joint caused by the rib distortion makes the joint easily prone to fatigue damage. In this paper, based on the parametric analysis of several classical design parameters, static load experiments of an orthotropic steel deck specimen are performed. Measurement results support the positive correlations between the weld length of rib-to-crossbeam joint and the distortional stress. The most unfavorable load position of stress concentration induced by rib distortion is also verified, which is about 1600 mm away from the investigated crossbeam. Experimental results indicate that ribs are deformed toward different directions at the midspan section and the crossbeam section separately when the load is eccentric from the axis of rib.</p>

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Ju, J. W., and K. Yanase. "Elastoplastic Micromechanical Damage Mechanics for Composites With Progressive Partial Fiber Debonding and Thermal Residual Stress." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42744.

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By incorporating interfacial damage and thermal residual stress, a novel elastoplastic damage model is proposed to predict the overall transverse mechanical behavior of fiber-reinforced ductile matrix composites within the framework of micromechanics. Based on the concept of fictitious inclusion, and taking the debonding angle into consideration, partially debonded isotropic fibers are replaced by equivalent orthotropic yet perfectly bonded elastic fibers. Up to three interfacial damage modes (no debonding, partial debonding and complete debonding) are considered. The Weibull’s probabilistic function is employed to describe the varying probability of progressive partial fiber debonding. The effective elastic moduli of four-phase composites, composed of a ductile matrix and randomly located yet unidirectionally aligned fibers (undamaged/damaged) are derived by a micromechanical formulation. Thermal residual stress is taken into account through the concept of thermal eigenstrain to study the effect of the manufacturing process-induced residual stress. Further, explicit exact formulation on the exterior point Eshelby’s tensor for elliptical fiber is utilized to investigate the effect on the inelastic mechanical responses of the composites due to the aspect ratio of elliptical fiber.

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Kweon, Soondo, and Daniel S. Raja. "Damage and Anisotropy Evolution in the Free End Shear Problem." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-52965.

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Анотація:

The evolution of microstructure occurs in the deformation of metals via texture evolution. The effect of the microstructural evolution, i.e., anisotropy evolution, on the free end shear problem is investigated. An anisotropic ductile fracture model that takes into account the evolution of the orthotropic axes in the matrix is employed to perform the above task. With the model, a well-known experiment that provides the evidence of anisotropy evolution, the free end cyclic torsion test, is simulated. For the simulation of the free end cyclic torsion test, an explicit numerical scheme for the free end shear simulation is proposed and performed to reproduce the experimental result of the free end torsion test. The simulation result reveals the physics of the shear damage process, which is that porosity evolves in the shear deformation of (induced) anisotropic materials due to the evolution of anisotropy. A series of the free end shear simulations reveal the effect of the interaction among the matrix anisotropy, porosity and void shape onto the deformation pattern and the ductile damage process of porous materials.

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Jiang, Yang, Yi Lu, and Chen Xu. "Shrinkage and Fatigue Performance of Novel Post-Combined Steel- UHPC Composite Decks." In IABSE Congress, Nanjing 2022: Bridges and Structures: Connection, Integration and Harmonisation. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/nanjing.2022.0937.

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Анотація:

<p>Considerable UHPC shrinkage has an enormous impact on steel-UHPC composite deck. To this end, a novel post-combined orthotropic steel-naturally cured UHPC composite deck was proposed in this paper. Two full-scale segmental steel-UHPC composite decks, one normal while the other post-combined, were fabricated for shrinkage monitoring and fatigue loading tests. The monitoring results showed that shrinkage-induced secondary stress on the steel deck of the post- combined specimen was lower than that of the normal one. And the fatigue loading test results showed that there was no significantly worse damage on the rib-deck weld detail in the post- combined specimen. In other words, the post-combined method mitigated UHPC shrinkage restraint without obvious deterioration to fatigue resistance. It contributed to establishing an economical alternative that could effectively address the adverse shrinkage effect on a steel-UHPC composite deck.</p>

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