Journal articles: 'Large deformation'

1

Speich, Marco, Wolfgang Rimkus, Markus Merkel, and Andreas Öchsner. "Large Deformation of Metallic Hollow Spheres." Materials Science Forum 623 (May 2009): 105–17. http://dx.doi.org/10.4028/www.scientific.net/msf.623.105.

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Hollow sphere structures are a new group of advanced lightweight materials for multifunctional applications. Within the scope of this paper, the uniaxial deformation behaviour in the regime of large deformations is investigated. Appropriate computational models are developed to account for the deformation mechanisms occurring under high deformations. Macroscopic stress-strain curves are derived and the influence of different material parameters is investigated.

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Fan, Jinyan, Zhibiao Guo, Xiaobing Qiao, Zhigang Tao, Fengnian Wang, and Chunshun Zhang. "Constant Resistance and Yielding Support Technology for Large Deformations of Surrounding Rocks in the Minxian Tunnel." Advances in Civil Engineering 2020 (September 28, 2020): 1–13. http://dx.doi.org/10.1155/2020/8850686.

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During the excavation of the Minxian tunnel, problems of large deformations of surrounding rocks and failure of support structures appeared frequently, which caused serious influences on construction safety and costs of the tunnel. Based on laboratory analysis of mineral composition and field investigations on deformation characteristics of the surrounding rocks, the large deformation mechanism of surrounding rocks of the tunnel was considered as water-absorbing swelling molecules of carbonaceous slate and stress-induced asymmetric structural deformations of the surrounding rocks. The structural deformations of surrounding rocks mainly include bending deformation, interlayer sliding, and crushing failure of local rock blocks. Then, a new constant resistance and yielding support technology based on the constant resistance and large deformation (CRLD) anchor cable was proposed to control large deformations of surrounding rocks. The field tests and deformation monitoring were carried out. The monitoring results showed that compared with original support measure, the surrounding rock deformations, stresses of primary supports, and permanent lining using new support technology decreased greatly. Among them, the maximum deformation of surrounding rock was only 73 mm. The effects of field application and results of deformation monitoring showed that the new support technology can effectively control large deformations of the surrounding rocks in the Minxian tunnel.

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Zhao, Gang, Liuyu Wang, Kazhong Deng, Maomei Wang, Yi Xu, Meinan Zheng, and Qing Luo. "An Adaptive Offset-Tracking Method Based on Deformation Gradients and Image Noises for Mining Deformation Monitoring." Remote Sensing 13, no. 15 (July 27, 2021): 2958. http://dx.doi.org/10.3390/rs13152958.

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The offset-tracking method (OTM) utilizing SAR image intensity can detect large deformations, which makes up for the inability of interferometric synthetic aperture radar (InSAR) technology in large mining deformation monitoring, and has been widely used. Through lots of simulation experiments, it was found that the accuracy of OTM is associated with deformation gradients and image noises in the cross-correlation window (CCW), so CCW sizes should be selected reasonably according to deformation gradients and noise levels. Based on the above conclusions, this paper proposes an adaptive CCW selection method based on deformation gradients and image noises for mining deformation monitoring, and this method considers influences of deformation gradients and image noises on deformations to select adaptive CCWs. In consideration of noise influences on offset-tracking results, smaller CCWs are selected for large deformation gradient areas, and larger CCWs are selected for small deformation gradient areas. For some special areas, special CCWs are selected for offset-tracking. The proposed method is implemented to simulation and real experiments, and the experiment results demonstrate that the proposed method with high reliability and effectiveness can significantly improve the accuracy of OTM in mining deformation monitoring.

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Sekhon, G. S. "Large Deformation II." Defence Science Journal 53, no. 2 (April 1, 2003): 25–26. http://dx.doi.org/10.14429/dsj.53.2262.

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Sekhon, G. S. "Large Deformation -I." Defence Science Journal 53, no. 1 (January 1, 2003): 3–4. http://dx.doi.org/10.14429/dsj.53.2270.

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Bruhns, Otto T. "Large deformation plasticity." Acta Mechanica Sinica 36, no. 2 (February 12, 2020): 472–92. http://dx.doi.org/10.1007/s10409-020-00926-7.

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LIU, S. J., H. WANG, and H. ZHANG. "SMOOTHED FINITE ELEMENTS LARGE DEFORMATION ANALYSIS." International Journal of Computational Methods 07, no. 03 (September 2010): 513–24. http://dx.doi.org/10.1142/s0219876210002246.

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The smoothed finite element method (SFEM) was developed in order to eliminate certain shortcomings of the finite element method (FEM). SFEM enjoys some of the flexibilities of meshfree methods. One advantage of SFEM is its applicability to modeling large deformations. Due to the absence of volume integration and parametric mapping, issues such as negative volumes and singular Jacobi matrix do not occur. However, despite these advantages, SFEM has never been applied to problems with extreme large deformation. For the first time, we apply SFEM to extreme large deformations. For two numerical problems, we demonstrate the advantages of SFEM over FEM. We also show that SFEM can compete with the flexibility of meshfree methods.

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Wang, Ren Zuo, Shih Hung Chen, Chao Hsun Huang, Bing Chang Lin, and Chung Yue Wang. "Large Deformation Analysis of Buried Pipeline." Applied Mechanics and Materials 405-408 (September 2013): 759–62. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.759.

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In this paper, a set of the procedures of the numerical simulation for the buried pipeline is proposed. These numerical procedures are used to compute the large deformations of the buried pipeline through the fault. In order to simulate the fault slip, displacement control is adopted. The geometric and material nonlinearity of buried pipe are considered. The beam elements are used to calculate the buckling deformation of the pipe. The ASCE (1984) soil spring models (SSM) are used to model the interaction of deformation of the soil and the buried pipe. In order to confirm rationality of numerical results using SSM, comparison between experiment result in Cornell University (CU) [5], Trautmann and ORourke experiment results [7] and SSM numerical results are studied. Two examples demonstrate the accuracy of the proposed procedures.

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Trajkovic-Milenkovic, Marina, and Otto Bruhns. "Numerical analysis of finite hypo-elastic cyclic deformation with large rotations." Facta universitatis - series: Architecture and Civil Engineering 17, no. 3 (2019): 299–313. http://dx.doi.org/10.2298/fuace190513006t.

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Constitutive relations which describe engineering materials behaviour during the finite elastoplastic deformations are usually presented in the form of rates of stresses and strains. One of the possible approaches in the constitutive relations formulation is the additive decomposition of the total deformation rate into its elastic part and its plastic part. The elastic deformation rate contributes to any elastoplastic deformation at any stage. Hence, its exact and well-considered formulation is of particular importance and it has to be properly predicted by the corresponding material law. This is of great importance in particular when deformation cyclic processes are considered, in which case small errors may accumulate, even if the total deformation is small. The implementation of the most frequently used corotational rates, i.e. the Jaumann rate and the Green-Naghdi rate, in the hypo-elastic constitutive relations regarding small and moderate rotations gives accurate results for low number of repeated deformation cycles. With increased number of cycles, however, the implementation of these rates results in different and physically non-admissible material responses. This instability in results is particularly observable during the cyclic deformations with large rotations, which is the main subject of this work. In contrast to the aforementioned objective rates, the results of the logarithmic rate implementation into the hypo-elastic constitutive relations for the case of pure elastic deformation describe a physically stable process.

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10

Ostertag, Oskar, Eva Ostertagová, and Ladislav Novotný. "Analytical and Numerical Solution of Large Actuator Deformation." Applied Mechanics and Materials 816 (November 2015): 96–102. http://dx.doi.org/10.4028/www.scientific.net/amm.816.96.

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This paper deals with the possibility of controlled deformation of the actuator of a flexible system. In the solution, large deformations of the actuator have been assumed. The model was made of a material capable of large deformations caused by internal pressure. The internal pressure was let into the cavities located in the actuator. The solution was realized analytically and numerically. The results show the relevance of the stated proposal.

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Ishii, Yoshie, Junichi Susaki, Akane Kurihara, Tetsuharu Oba, Kosei Yamaguchi, Yuusuke Miyazaki, and Kiyoshi Kishida. "Landslide Risk Assessment along Roads by Using Radar-driven Land Deformation and Rainfall Data." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLVIII-3-2024 (November 7, 2024): 231–37. http://dx.doi.org/10.5194/isprs-archives-xlviii-3-2024-231-2024.

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Abstract. To prevent damage from landslide disasters, traffic regulation based on records is implemented before disasters occur in Japan. Logistics and accordingly economic activities are halted once the traffic regulation is implemented. There are problems that the operation of the traffic regulation tends to be redundant in terms of temporal duration and spatial coverage. In this paper, to consider the effect of topography and land deformation and resolve the problems of redundant traffic regulation, we attempted to predict the land deformation using spatio-temporal statistical models whose objective variable was deformation estimated PSInSAR and explanatory variables were accumulated rainfall and maximum gradient angle. Three statistical models: low-rank GP model, separable covariance model, and product-sum covariance model were used. According to the results of experiments, three spatio-temporal models showed similar predictions; relatively small deformations were well fitted while relatively large deformations were poorly fitted. Since land deformation due to landslides is relatively large, it should be considered the measures to improve the prediction of larger deformations.

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12

Solomon, Sean C. "Earth deformation, writ large." Nature Geoscience 2, no. 10 (October 2009): 679. http://dx.doi.org/10.1038/ngeo650.

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13

Bleher, Frauke M. "Large universal deformation rings." Proceedings of the American Mathematical Society 142, no. 9 (May 30, 2014): 3039–47. http://dx.doi.org/10.1090/s0002-9939-2014-12104-6.

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14

Rückert, Jens, and Arnd Meyer. "Large deformation and plates." PAMM 12, no. 1 (December 2012): 669–70. http://dx.doi.org/10.1002/pamm.201210323.

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15

Fashanu, T. A., A. T. Adebusoye, A. A. Oyediran, and O. O. Adewumi. "Dynamic analysis of the large strain deformation of flexible pipes conveying two-phase fluids. Part II: nonlinear vibration analysis." Nigerian Journal of Technology 42, no. 1 (May 8, 2023): 130–35. http://dx.doi.org/10.4314/njt.v42i1.16.

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This work presents the nonlinear analysis of the dynamics of large strain deformation of subsea flowlines and jumpers conveying two-phase fluid. Precisely, flexible pipes operating in the stated condition undergo large strain deformations. Thus, the known nonlinear deterministic model of the system is solved using method of discretized perturbation. Precisely, this study obtained the nonlinear natural frequency of simply supported flexible pipes modelled using the large strain deformation theory. Results show that both hardening and softening nonlinear behaviors are indicated for pipe undergoing large strain deformation compared with deformations modelled with small strain theory. Thus, operational insights and parameters for sustainable management of large strain deformed subsea flow lines and jumpers conveying two phase flow are made available.

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Begun, A. S., A. A. Burenin, and L. V. Kovtanyuk. "LARGE DEFORMATIONS AND HEATING OF ELASTOVISCOPLASTIC MATERIAL IN A CYLINDRICAL VISCOMETER." Mechanics of Solids 57, no. 3 (June 2022): 532–42. http://dx.doi.org/10.3103/s0025654422030062.

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Abstract A solution for a coupled thermomechanical boundary value problem of the theory of large deformations that simultaneously takes into account the intense deformation of an elastoviscoplastic material and its heating due to such deformation and near-wall friction is constructed. The conditions for the emergence and development of a viscoplastic flow in the material of a cylindrical layer enclosed between rigid surfaces, one of which has the ability to rotate under the action of a changing given load relative to the axis of the viscometer, are calculated. At all stages of the process from its start to stop, the stress-strain state and temperature distributions in the areas of flow and reversible deformation are calculated, including flow stop, unloading and cooling, with the calculation of residual stresses and deformations. The yield strength is assumed to be temperature dependent.

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17

le Joncour, Lea, Benoit Panicaud, Andrzej Baczmanski, Manuel François, Chedly Braham, and Anna Maria Paradowska. "Large Deformation and Mechanical Effects of Damage in Aged Duplex Stainless Steel." Materials Science Forum 652 (May 2010): 155–60. http://dx.doi.org/10.4028/www.scientific.net/msf.652.155.

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The lattice strains in large tensile deformations, up to the fracture of the sample were measured using neutron TOF method. For the first time, the range of large deformation was studied measuring lattice strain in the deformation neck and using special correction for macrostress value. It was found that during large plastic deformation the lattice stresses arise almost linearly with the macrostress value. The relaxation of elastic strains in some groups of ferritic grains (corresponding to reflections 211 and 200) can be connected with initiation of damage process in the ferritic phase.

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Du, Qian, Piao Wang, and Dongdong Li. "Aircraft deicing based on large vibration of wings." PLOS ONE 19, no. 9 (September 19, 2024): e0308358. http://dx.doi.org/10.1371/journal.pone.0308358.

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Since aircraft icing will decrease the ability of aircraft to generate lift, it is significant to consider the aircraft deicing problem. The paper presents an aircraft deicing method based on the cracking of the ice layer caused by the large deformations of wings. To describe the deformation of wings, the absolute coordinate-based formulation is used. The aircraft with high aspect ratio wings is simplified as a hub-beam system. Such a rigid-flexible system with the fast rotation speed of hub and the large deformation of the beam is modeled using absolute coordinate-based formulation accurately. The maneuver of the rigid body will lead to the large deformation of wings to do the de-icing. Numerical examples are presented to reveal that the maximum tensile strength on the wing surface with sinusoidal control torques with some amplitudes and frequencies is larger than the ice’s tensile strength. Hence, the proposed de-icing method based on the aircraft maneuvering is potential.

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He, Jiandong, Chong Wu, and Yining Jia. "A GPU-Accelerated 3D Mesh Deformation Method Based on Radial Basis Function Interpolation." Mathematical Problems in Engineering 2022 (October 13, 2022): 1–8. http://dx.doi.org/10.1155/2022/6018008.

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In this paper, we developed a GPU parallelized 3D mesh deformation based on the radial basis function (RBF) interpolation using NVIDIA CUDA C++. The RBF mesh deformation method interpolates displacements of the boundary nodes to the whole mesh, which can handle large mesh deformations caused by translations, rotations, and deformations. However, the computational performance of RBF mesh deformation depends on the quantity of grids. For 3D mesh deformation, especially for mesh with large number of boundary nodes, RBF interpolation has been verified computationally intensive. By introducing GPU acceleration, the computational performance of RBF mesh deformation code improved significantly. Several benchmark test cases were carried out to show the feasibility and efficiency of GPU parallelization. In summary, the GPU parallelized RBF interpolation shows the potential to become an alternative way to deal with 3D mesh deformation problems in an efficient way.

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Trimulyono, Andi, and Ardhana Wicaksono. "Simulasi numerik large-deformation surface wave dengan smoothed particle hydrodynamics." Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan 15, no. 3 (February 14, 2019): 102–6. http://dx.doi.org/10.14710/kapal.v15i3.21535.

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Utyashev, F. Z., A. V. Botkin, E. P. Volkova, and R. Z. Valiev. "Rational Methods of Plastic Deformation Providing Formation of Ultrafine-Grained Structure in Large-Sized Products." Reviews on Advanced Materials and Technologies 6, no. 1 (March 31, 2024): 12–23. http://dx.doi.org/10.17586/2687-0568-2024-6-1-12-23.

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Based on the peculiarities of plastic deformation mechanics and physical mesomechanics, the processes are considered and technological schemes for their realization are proposed to ensure the formation of ultrafine-grained structure in axisymmetric products of large sizes. Deformation of coarse-grained materials in temperature-velocity conditions of superplastic deformation and methods of severe plastic deformation are taken as methods of preparation of such a structure. All of these deformations include large strain, and they are carried out at low hydraulic press speeds, but at different temperatures: in the mode of superplasticity at hot temperatures, and in the mode of severe plastic deformation at warm or cold temperature deformation. The first mode allows grains to be refined to microcrystalline sizes of 1–10 microns, and such a material acquires the ability to deform in a state of superplasticity, i.e., in tension with low resistance to deformation and high elongation. The second mode (severe plastic deformation) refines grains to submicro- (1÷0.1 µm) and nanosizes (less than 0.1 µm), thus giving metal materials record structural strength, as well as the possibility to use processing in extended temperature-velocity conditions of superplastic deformation in comparison with microcrystalline structure.

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Wang, Jie, Dongxu Li, and Jianping Jiang. "Thermally induced deformation of ultra-large truss support membrane structure." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 231, no. 13 (September 14, 2016): 2502–12. http://dx.doi.org/10.1177/0954410016667145.

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Large space structures experience changing thermal environment during orbiting the earth. The resultant temperature gradients induce structural deformations that may downgrade performance of payloads conducting high precision missions and even affect stability of the spacecraft. So, it is extremely important to analyze thermally induced deformation of large space structures for routine operation. In this paper, the ultra-large truss support membrane structure on satellite is characterized and studied. The methodology of thermal quasi-static deformation is formulated and the procedure of thermo-structural analysis is proposed. The thermostructural analysis model with hollow tubes is developed based on finite difference method and finite element method. With heat fluxes from solar radiation, earth radiation, and earth albedo radiation being considered, the temperature distribution filed is obtained from the thermal analysis and then applied to the structural analysis model to calculate quasi-static deformations and root mean square errors with orbital angles. Results show that temperature gradients along circumferential direction of tubes can induce prominent shape error. The proposed method is useful for predicting thermally induced deformation of large space structures and valuable for designing active control systems to compensate for disturbances.

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Hao, Yang, Chunhui Liu, Yu Wu, Hai Pu, Kai Zhang, and Lingling Shen. "Analysis of Stress and Deformation on Surrounding Rock Mass of a Trapezoidal Roadway in a Large Inclination Coal Seam and Novel High Yielding Prop Support: A Case Study." Mathematics 11, no. 2 (January 7, 2023): 319. http://dx.doi.org/10.3390/math11020319.

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Trapezoidal roadways in large inclination coal seams show asymmetrical tectonic characteristics, while there is still a lack of theoretical results on stress, deformation, and efficient and effective supporting methods on high walls. In this paper, based on the geological characteristics of a large, inclined coal seam roadway, a mechanical model for stress–deformation analysis of trapezoidal section roadway was established. Complex analysis and a comfort map were employed to investigate the stress and deformation distribution on the roadway surface, and a novel yielding prop with high load capacity and constant working resistance was employed to support a high wall side based on analytical results. The results are as follows: (1) The deformation of the high wall is larger than that of the low wall, and the deformation of the roof is larger than that of the floor. The overall deformation of the surrounding rock shows that the rib closure is larger than the roof-to-floor closure. (2) The stress of the surrounding rock shows that both horizontal and vertical stresses are highest in the upper corner, indicating that the broken zone is most likely to occur at this location. (3) A new support employed with a high-yielding prop and a high-strength cable in a large, inclined angle roadway is proposed. On-site experiments were conducted in a large 5-1081 roadway of a coal mine in Shanxi, China. Under the influence of mining disturbance, the deformations at the top corner decreased by 40% compared with before. The test results show that the new support scheme can effectively control the development of roadway deformation and damage during the mining process. The new support also shows friendly environmental support and fast installation.

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Glimm, James G., Bradley J. Plohr, and David H. Sharp. "Conservative Formulation of Large Deformation Plasticity." Applied Mechanics Reviews 46, no. 12 (December 1, 1993): 519–26. http://dx.doi.org/10.1115/1.3120313.

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We explain several ideas which may, either singly or in combination, help achieve high resolution in simulations of large-deformation plasticity. Because of the large deformations, we work in the Eulerian picture. The governing equations are written in a fully conservative form, which are correct for discontinuous as well as continuous solutions. Models of shear bands are discussed. These models describe the internal dynamics of a developed shear band in terms of time-asymptotic states; in other words, the smooth internal structure is replaced by a jump discontinuity, and the shear band evolution is determined by jump relations. This analysis is useful for high resolution numerical methods, including both shock capturing and shock tracking schemes, as well as for the understanding and validation of computations, independently of the underlying method. Preliminary computations, which illustrate the feasibility of these ideas, are presented.

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Fetisov, V. Р. "Structural aspects of deformation hardening with repeated drawing low carbon wire." Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY), no. 2 (May 31, 2022): 44–49. http://dx.doi.org/10.21122/1683-6065-2022-2-44-49.

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While repeated drawing of low carbon wire, a decrease in the grain size of ferrite reduces the parameters of deformation hardening in the initial field of deformations with parabolic hardening and increases in the field of substructural hardening with large and extra‑large total compressions. The transition from large to super‑large total deformations goes along with the development of dynamic return processes that reduce the rate of deformation hardening. Preliminary thermal softening of cold‑formed wire increases the strength gain during subsequent drawing and can be used to increase the total compression of the wire rod before intermediate heat treatment.

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Gao, Lin, Jie Yang, Bo-Tao Zhang, Jia-Mu Sun, Yu-Jie Yuan, Hongbo Fu, and Yu-Kun Lai. "Real-time Large-scale Deformation of Gaussian Splatting." ACM Transactions on Graphics 43, no. 6 (November 19, 2024): 1–17. http://dx.doi.org/10.1145/3687756.

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Neural implicit representations, including Neural Distance Fields and Neural Radiance Fields, have demonstrated significant capabilities for reconstructing surfaces with complicated geometry and topology, and generating novel views of a scene. Nevertheless, it is challenging for users to directly deform or manipulate these implicit representations with large deformations in a real-time fashion. Gaussian Splatting (GS) has recently become a promising method with explicit geometry for representing static scenes and facilitating high-quality and real-time synthesis of novel views. However, it cannot be easily deformed due to the use of discrete Gaussians and the lack of explicit topology. To address this, we develop a novel GS-based method (GaussianMesh) that enables interactive deformation. Our key idea is to design an innovative mesh-based GS representation, which is integrated into Gaussian learning and manipulation. 3D Gaussians are defined over an explicit mesh, and they are bound with each other: the rendering of 3D Gaussians guides the mesh face split for adaptive refinement, and the mesh face split directs the splitting of 3D Gaussians. Moreover, the explicit mesh constraints help regularize the Gaussian distribution, suppressing poor-quality Gaussians ( e.g. , misaligned Gaussians, long-narrow shaped Gaussians), thus enhancing visual quality and reducing artifacts during deformation. Based on this representation, we further introduce a large-scale Gaussian deformation technique to enable deformable GS, which alters the parameters of 3D Gaussians according to the manipulation of the associated mesh. Our method benefits from existing mesh deformation datasets for more realistic data-driven Gaussian deformation. Extensive experiments show that our approach achieves high-quality reconstruction and effective deformation, while maintaining the promising rendering results at a high frame rate (65 FPS on average on a single commodity GPU).

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Ha, In Young, Matthias Wilms, and Mattias Heinrich. "Semantically Guided Large Deformation Estimation with Deep Networks." Sensors 20, no. 5 (March 4, 2020): 1392. http://dx.doi.org/10.3390/s20051392.

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Deformable image registration is still a challenge when the considered images have strong variations in appearance and large initial misalignment. A huge performance gap currently remains for fast-moving regions in videos or strong deformations of natural objects. We present a new semantically guided and two-step deep deformation network that is particularly well suited for the estimation of large deformations. We combine a U-Net architecture that is weakly supervised with segmentation information to extract semantically meaningful features with multiple stages of nonrigid spatial transformer networks parameterized with low-dimensional B-spline deformations. Combining alignment loss and semantic loss functions together with a regularization penalty to obtain smooth and plausible deformations, we achieve superior results in terms of alignment quality compared to previous approaches that have only considered a label-driven alignment loss. Our network model advances the state of the art for inter-subject face part alignment and motion tracking in medical cardiac magnetic resonance imaging (MRI) sequences in comparison to the FlowNet and Label-Reg, two recent deep-learning registration frameworks. The models are compact, very fast in inference, and demonstrate clear potential for a variety of challenging tracking and/or alignment tasks in computer vision and medical image analysis.

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Gurao, N. P., and Satyam Suwas. "Deformation mechanisms during large strain deformation of nanocrystalline nickel." Applied Physics Letters 94, no. 19 (May 11, 2009): 191902. http://dx.doi.org/10.1063/1.3132085.

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Dolzhenko, Anastasiia, Marina Tikhonova, Rustam Kaibyshev, and Andrey Belyakov. "Microstructures and Mechanical Properties of Steels and Alloys Subjected to Large-Strain Cold-to-Warm Deformation." Metals 12, no. 3 (March 8, 2022): 454. http://dx.doi.org/10.3390/met12030454.

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The effect of large-strain cold-to-warm deformation on the microstructures and mechanical properties of various steels and alloys is critically reviewed. The review is mainly focused on the microstructure evolution, whereas the deformation textures are cursorily considered without detailed examination. The deformation microstructures are considered in a wide strain range, from early straining to severe deformations. Such an approach offers a clearer view of how the deformation mechanisms affect the structural changes leading to the final microstructures evolved in large strains. The general regularities of microstructure evolution are shown for different deformation methods, including conventional rolling/swaging and special techniques, such as equal channel angular pressing or torsion under high pressure. The microstructural changes during deformations under different processing conditions are considered as functions of total strain. Then, some important mutual relationships between the microstructural parameters, e.g., grain size vs. dislocation density, are revealed and discussed. Particular attention is paid to the mechanisms of microstructure evolution that are responsible for the grain refinement. The development of an ultrafine-grained microstructure during large strain deformation is considered in terms of continuous dynamic recrystallization. The regularities of the latter are discussed in comparison with conventional (discontinuous) dynamic recrystallization and grain subdivision (fragmentation) phenomenon. The structure–property relations are quantitatively represented for the structural strengthening, taking into account various mechanisms of dislocation retardation.

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Diao, Xinpeng, Quanshuai Sun, Jing Yang, Kan Wu, and Xin Lu. "A Novel Deformation Extraction Approach for Sub-Band InSAR and Its Application in Large-Scale Surface Mining Subsidence Monitoring." Sustainability 15, no. 1 (December 26, 2022): 354. http://dx.doi.org/10.3390/su15010354.

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Differential synthetic aperture radar interferometry (InSAR) is widely used to monitor ground surface deformation due to its wide coverage and high accuracy. However, the large-scale and rapid deformation that occurs in mining areas often leads to densely spaced interference fringes, thus, severely limiting the applicability of D-InSAR in mining subsidence monitoring. Sub-band InSAR can reduce phase gradients in interferograms by increasing the simulated wavelength, thereby characterising large-scale surface deformations. Nonetheless, accurate registration between non-overlapping sub-band images with conventional sub-band InSAR is challenging. Therefore, our study proposed a new sub-band InSAR deformation extraction method, based on raw full-bandwidth single-look complex image pair registration data to facilitate sub-band interferometric processing. Simulations under noiseless conditions demonstrated that the maximum difference between the sub-band InSAR-monitored results and real surface deformations was 26 mm (1.86% of maximum vertical deformation), which theoretically meets the requirements for mining subsidence monitoring. However, when modelling dynamic deformation with noise, the sub-band InSAR-simulated wavelength could not be optimised for surface deformation due to the limitation in current SAR satellite bandwidths, which resulted in significantly noisy and undistinguishable interference fringes. Nonetheless, this method could still be advantageous in high-coherence regions where surface deformation exceeds 1/5th of the simulated wavelength.

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Zhang, Qing Ping, and Zhi Geng Fan. "Large Deformations of Low Density Open-Cell Elastomeric Foams: Kelvin Model Study." Applied Mechanics and Materials 117-119 (October 2011): 550–55. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.550.

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Based on Kelvin model, the large deformations of elastomeric foams were simulated by finite element method (FEM). Numerical results indicated that edge bending, edge stretching and edge torsion were important deformation mechanisms of low density open-cell Kelvin foam. The hyperelasticity of the cell material had little effect on the macro-mechanical properties of the foam at low strain in [111] direction and finite compressive strain in [100] direction when edge bending was the main deformation mechanism of the foams. With the increase of the uniaxial tensile strain, edge stretching played notable roles, which resulted in that the hyperelasticity of the solid had significantly influence on the deformation of the foam at large uniaxial tensile strain. And the high strain compressive stress-strain curves in the [111] direction based on the hyperelastic relation differed from the linear elastic results remarkably as edge torsion was an important deformation mechanism of the foam.

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Hussein, Bassam A., Hiroyuki Sugiyama, and Ahmed A. Shabana. "Coupled Deformation Modes in the Large Deformation Finite-Element Analysis: Problem Definition." Journal of Computational and Nonlinear Dynamics 2, no. 2 (November 17, 2006): 146–54. http://dx.doi.org/10.1115/1.2447353.

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In the classical formulations of beam problems, the beam cross section is assumed to remain rigid when the beam deforms. In Euler–Bernoulli beam theory, the rigid cross section remains perpendicular to the beam centerline; while in the more general Timoshenko beam theory the rigid cross section is permitted to rotate due to the shear deformation, and as a result, the cross section can have an arbitrary rotation with respect to the beam centerline. In more general beam models as the ones based on the absolute nodal coordinate formulation (ANCF), the cross section is allowed to deform and it is no longer treated as a rigid surface. These more general models lead to new geometric terms that do not appear in the classical formulations of beams. Some of these geometric terms are the result of the coupling between the deformation of the cross section and other modes of deformations such as bending and they lead to a new set of modes referred to in this paper as the ANCF-coupled deformation modes. The effect of the ANCF-coupled deformation modes can be significant in the case of very flexible structures. In this investigation, three different large deformation dynamic beam models are discussed and compared in order to investigate the effect of the ANCF-coupled deformation modes. The three methods differ in the way the beam elastic forces are calculated. The first method is based on a general continuum mechanics approach that leads to a model that includes the ANCF-coupled deformation modes; while the second method is based on the elastic line approach that systematically eliminates these modes. The ANCF-coupled deformation modes eliminated in the elastic line approach are identified and the effect of such deformation modes on the efficiency and accuracy of the numerical solution is discussed. The third large deformation beam model discussed in this investigation is based on the Hellinger–Reissner principle that can be used to eliminate the shear locking encountered in some beam models. Numerical examples are presented in order to demonstrate the use and compare the results of the three different beam formulations. It is shown that while the effect of the ANCF-coupled deformation modes is not significant in very stiff and moderately stiff structures, the effect of these modes can not be neglected in the case of very flexible structures.

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Du, Xin. "Modal Analysis and Design on the Base Plate of Large-Scale Linear Vibration Screen." Applied Mechanics and Materials 155-156 (February 2012): 514–18. http://dx.doi.org/10.4028/www.scientific.net/amm.155-156.514.

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Large-scale vibration screen produced modal deformation under the influence of their quality. They often leaded to destruction in the linear vibration screen. This damage often occurred in side plates and screen boxes. Because rivets connected the side plate, it was individually analyzed. There were large deformation of linear vibration screen ZX3175 by computer software COSMOSWorks. The nature frequency of the screen plate was close to the screen source. There were large modal deformations at the edge of the plate. This was the main reason for fatigue damage of the plate. This paper put forward some methods to reduce modal deformation of the base plate.

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Barbič, Jernej, and Yili Zhao. "Real-time large-deformation substructuring." ACM Transactions on Graphics 30, no. 4 (July 2011): 1–8. http://dx.doi.org/10.1145/2010324.1964986.

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Panoskaltsis, Vassilis, Lazaros Polymenakos, and Dimitris Soldatos. "On large deformation generalized plasticity." Journal of Mechanics of Materials and Structures 3, no. 3 (May 1, 2008): 441–57. http://dx.doi.org/10.2140/jomms.2008.3.441.

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Levin, V. A. "Repeatedly superimposed large elastic deformation." International Journal of Fracture 79, no. 1 (1996): R11—R15. http://dx.doi.org/10.1007/bf00017717.

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Obozov, V. I., O. I. Ponomarev, and A. Yu Ivanova. "Deformation of large stones masonry." Bulletin of Science and Research Center of Construction 37, no. 2 (July 1, 2023): 107–15. http://dx.doi.org/10.37538/2224-9494-2023-2(37)-107-115.

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Introduction. The paper investigates the stress-strain state of masonry walls made of large ceramic stones with dry vertical tongue and groove joints.Aim: to study the distribution of vertical stresses in masonry of large ceramic stones with vertical tongue and groove joints not filled with mortar.Materials and methods. The study was performed on the model of the wall section. Numerical study of the stress state of the wall masonry at a concentrated load was carried out for masonry with chain bond. The wall fragment was modeled by solid finite elements.Results. It was found that under a concentrated load, the deformable zone has the form of a triangle with a vertex under load and expanding as it moves away from the load point. Based on the studies conducted, the authors of the paper have proposed an approximate method for determining compression stresses in masonry stones with chain bond. When the load is concentrated, the zone of distribution of compressive stresses in the masonry has the form of a triangle. The study established the characteristics of the distribution of compressive stresses in chain masonry of walls made of large stones with dry vertical joints at a concentrated load.Conclusions. The study shows that the existing methods of calculating solid masonry are not suitable for calculating masonry with dry vertical tongue and groove joints because the latter comprise a discrete-continual system.

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Wu, C. L., Z. R. Wang, and Wen Zhang. "Research of Formation Mechanics on Nanostructured Chips by Multi-Deformations Based on Finite Element Method." Advanced Materials Research 989-994 (July 2014): 352–55. http://dx.doi.org/10.4028/www.scientific.net/amr.989-994.352.

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Formation of chip is a typical severe plastic deformation progress in machining which is only single deformation stage. The rake angle of tool is governing parameter to create large strain imposed in the chip. Effect of rake angle and deformation times on effective strain, mean strain, strain variety and strain rate imposed in the chip are researched respectively. The result of simulation have shown that the chip with large strain and better uniform of strain along the longitudinal section of chip can be produced with negative rake angle at some lower cutting velocity by multi-deformations in large strain machining.

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Pan, Peng, Yu Zhang, Shi Yan Song, and Lie Ping Ye. "Factors Influencing Maximum and Residual Deformations of SDOF Systems Subjected to Large Ground Motions." Advanced Materials Research 243-249 (May 2011): 170–77. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.170.

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The maximum and residual deformations of structures subjected to strong ground motions are the most importance indexes, particularly under the performance-based design framework, thus understanding the influencing factors is of great importance to seismic design. In this study, single degree of freedom (SDOF) systems with varying structural properties are analyzed using a series of strong ground motions from FEM/SAC project. The influences of three structural parameters, i.e., yield force, second stiffness after yielding, and stiffness degradation, on the maximum and residual deformations are investigated based on the statistics of the analysis results. The analysis results suggest the follows: (1) larger yield forces lead to smaller residual and maximum deformations for short period structures, and they lead to smaller residual deformations but no necessarily smaller maximum deformation for intermediate and long period structures; (2) larger second stiffness lead to smaller residual and maximum deformations for short period structures, and they lead to smaller residual deformations but no necessarily smaller maximum deformation for intermediate and long period structures; (3) smaller stiffness degradation index leads to smaller maximum deformations but larger residual deformations.

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Kovtanyuk, L. V. "ANALYTICAL SOLUTION OF THE CREEP PROBLEM VISCOELASTIC MATERIAL IN A ROUND TUBE." Доклады Российской академии наук. Физика, технические науки 513, no. 1 (November 1, 2023): 67–71. http://dx.doi.org/10.31857/s2686740023060111.

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Using a mathematical model of large deformations of materials with elastic, plastic and viscous properties, an analytical solution was obtained for deformation under creep conditions of a bung in a round tube with a varying pressure drop. The motion is considered taking into account the sliding of the material in the vicinity of the rigid wall of the pipe and its deformation under increasing, constant and decreasing pressure. Displacements, reversible and irreversible deformations, stresses at all stages of deformation, including residual deformations and stresses at full unloading are calculated.

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Lutchenko, N., А. Arbuz, А. Kawalek, К. Ozhmegov, Ye Panin, М. Magzhanov, and F. Popov. "Study of the influence of large shear strains and vortex flow of metal on the formation of an equiaxed ultrafine-grained structure of the E110 zirconium alloy by X-ray diffraction analysis." Engineering Journal of Satbayev University 144, no. 6 (2022): 24–32. http://dx.doi.org/10.51301/ejsu.2022.i6.04.

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In this work, the task was to investigate the processes of microstructure change occurring in relatively large bulk bars under the action of large plastic deformations. Such large levels of deformation are usually achievable in high pressure twisting of small flat disks, but are difficult to achieve in large bulk bars. The method of radial shear rolling makes it possible to achieve comparable ultrahigh degrees of deformation (~ 45 mm/mm) in combination with the vortex flow of the metal. Sequential rolling of the E110 zirconium alloy was carried out under extreme conditions on 2 radial shear rolling mills with a total reduction in diameter ε = 185% and a maximum accumulated deformation = 46 mm/mm. To assess the level of deformation and its distribution over the section, FEM modeling was carried out in Deform-3D. The resulting structure was studied by electron microscopy (TEM/SEM). A detailed cross-sectional study of the EBSD structure was performed with a resolution of 1 mm. A gradient structure with a predominance of an equiaxed ultrafine-grained structure was found, which was not very pronounced compared to the use of smaller deformations.

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Vyatkin, Sergey I., and Boris S. Dolgovesov. "Method of anisotropic deformation of elastic materials based on free-form patches." BOHR Journal of Biocomputing and Nano Technology 1, no. 2 (2023): 52–57. http://dx.doi.org/10.54646/bjbnt.2023.11.

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A method of anisotropic deformation of elastic materials based on free-form patches for biomechanics problems is presented. The method provides an analysis of the anisotropic hyperelasticity of transverse isotropy. For this purpose, fast and efficient Newton solutions are used. An invariant of anisotropic deformation is proposed, with the help of which side states of energy are eliminated at large deformation. The method is also used to restore finite elements. Because of this, it is possible to model large deformations, including for grids containing degenerate elements.

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Vyatkin, Sergey I., and Boris S. Dolgovesov. "Method of anisotropic deformation of elastic materials based on free-form patches." BOHR International Journal of Biocomputing and Nano Technology 2, no. 1 (July 17, 2023): 8–13. http://dx.doi.org/10.54646/bijbnt.2023.12.

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A method of anisotropic deformation of elastic materials based on free-form patches for biomechanics problems is presented. The method provides an analysis of the anisotropic hyperelasticity of transverse isotropy. For this purpose, fast and efficient Newton solutions are used. An invariant of anisotropic deformation is proposed, with the help of which side states of energy are eliminated at large deformation. The method is also used to restore finite elements. Because of this, it is possible to model large deformations, including for grids containing degenerate elements.

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Fang, Qiang, Weidong Chen, Anan Zhao, Changxi Deng, and Shaohua Fei. "Control system designing for correcting wing–fuselage assembly deformation of a large aircraft." Assembly Automation 37, no. 1 (February 6, 2017): 22–33. http://dx.doi.org/10.1108/aa-01-2016-006.

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Purpose In aircraft wing–fuselage assembly, the distributed multi-point support layout of positioners causes fuselage to deform under gravity load, leading to assembly difficulty and assembly stress. This paper aims to propose a hybrid force position control method to balance aerodynamic shape accuracy and deformation of assembly area, thereby correcting assembly deformation and reducing assembly stress. Design/methodology/approach Force and position control axes of positioners are selected based on screw theory and ellipsoid method. The position-control axes follow the posture trajectory to align the fuselage posture. To exert force on the fuselage and correct the deformations, the force-control axes follow the contact force derived by using orthogonal experiments and partial least squares regression (PLSR). Finite element simulation and one-dimension deformation correction experiment are conducted to verify the validity of this method. Findings Simulation results indicate that hybrid force position control method can correct assembly deformation and improve the wing–fuselage assembly quality significantly. Experiment on specimen verifies the effect of this method indirectly. Originality/value The proposed method gives a solution to solve the deformation problem during aircraft wing-fuselage assembly, thereby reducing assembly stress and improving assembly quality.

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Ostertag, Oskar, Ladislav Novotný, and Eva Ostertagová. "Application of Differential Equations to Calculations of Large Deformations of Structural Members." Applied Mechanics and Materials 611 (August 2014): 400–404. http://dx.doi.org/10.4028/www.scientific.net/amm.611.400.

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The article discusses the application of differential equations to solve large deformations of the designed slender structural elements. The structural element under design has a variable circular cross-section in longitudinal direction. It is made of a composite material based on carbon fiber and is capable of large deformations. In the solution it was necessary to consider the nonlinear deformation theory, which led to the solution of a nonlinear differential equation of second order. The creation of the differential equation describing the line of elastic deformation of a significantly curved structural element required the formulation of input equations and boundary conditions for its solution. The results obtained by means of a differential equation were compared with the numerical solution applying the finite element method. The solution presented and methodology can be used for practical application in the engineering design of fishing rods.

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Karmarkar, Aditya P., Xiaopeng Xu, and Karim El-Sayed. "Temperature and Process Dependent Material Characterization and Multiscale Stress Evolution Analysis for Performance and Reliability Management under Chip Package Interaction." International Symposium on Microelectronics 2017, no. 1 (October 1, 2017): 000013–24. http://dx.doi.org/10.4071/isom-2017-tp13_051.

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Abstract Distinct temperature and process dependent deformation behaviors under packaging temperature cycles are characterized for various packaging materials. Substrate and underfill deformations are described using Maxwell viscoelasticity model. Solder bump deformation is represented by incremental plasticity model. Anisotropic deformation in silicon and orthotropic deformation in substrate are also considered. The material deformation effects on stress evolutions during fabrication and under chip package interaction (CPI) are analyzed for a large package structure. Complex geometries spread over a large range of length scales are simulated using multi-level and multiscale sequential submodeling technique. Global package simulations show that substrate orthotropy has a significant impact on the package warpage during the assembly process. Sequential package assembly simulations are performed to examine the residual stresses at package, bump and interconnect scales. The results show that the package material behaviors during the assembly process affect not only the residual stresses in the large package structure but also in the local bump regions and the interconnect structures. The temperature dependent material non-linear behaviors under operating conditions also affect residual stresses and carrier mobility. This work demonstrates that developing performance and reliability management strategies under CPI should consider temperature and process dependent material deformations during fabrication and packaging.

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Nakajima, N., and E. R. Harrell. "Large shear deformation and estimation of deformational memory for polyethylacrylate rubbers." Journal of Macromolecular Science, Part B 35, no. 2 (April 1996): 215–28. http://dx.doi.org/10.1080/00222349608212382.

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Liang, Wei, and Hidekazu Murakawa. "Predicting Welding Distortion in a Panel Structure with Longitudinal Stiffeners Using Inherent Deformations Obtained by Inverse Analysis Method." Scientific World Journal 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/601417.

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Welding-induced deformation not only negatively affects dimension accuracy but also degrades the performance of product. If welding deformation can be accurately predicted beforehand, the predictions will be helpful for finding effective methods to improve manufacturing accuracy. Till now, there are two kinds of finite element method (FEM) which can be used to simulate welding deformation. One is the thermal elastic plastic FEM and the other is elastic FEM based on inherent strain theory. The former only can be used to calculate welding deformation for small or medium scale welded structures due to the limitation of computing speed. On the other hand, the latter is an effective method to estimate the total welding distortion for large and complex welded structures even though it neglects the detailed welding process. When the elastic FEM is used to calculate the welding-induced deformation for a large structure, the inherent deformations in each typical joint should be obtained beforehand. In this paper, a new method based on inverse analysis was proposed to obtain the inherent deformations for weld joints. Through introducing the inherent deformations obtained by the proposed method into the elastic FEM based on inherent strain theory, we predicted the welding deformation of a panel structure with two longitudinal stiffeners. In addition, experiments were carried out to verify the simulation results.

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Inoue, Ryo, Takuro Mori, and Shinya Matsumoto. "Effect of Numerous Small Deformations Due to Moderate Earthquakes on Seismic Response of Wooden Houses." Buildings 13, no. 4 (April 18, 2023): 1062. http://dx.doi.org/10.3390/buildings13041062.

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In order to confirm the effect of multiple moderate earthquakes on the response deformation of wooden houses at the time of a major earthquake, an earthquake response analysis, considering performance deterioration due to repeated small deformations, was conducted. As a result, it was found that the effect of multiple moderate earthquakes on the mean response deformation during a major earthquake was small. On the other hand, in some cases, the response deformation was up to 1.2 times larger than that of the sound case. In the case of a house where the response deformation was near the criteria of continuous use and/or collapse, the influence of the response magnification was large. This shows the importance of giving higher seismic performance compared to the standard. The response deformation during repeated medium earthquakes may increase for houses with considerably low seismic performance. However, for the houses that meet current standards, little to no increase in response deformation was seen.

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Blinova, Elena N., Alexander M. Glezer, M. A. Libman, and E. V. Pimenov. "Influence of Severe Plastic Deformations on Martensitic Transformation in Alloys of Fe-Cr-Ni System." Key Engineering Materials 910 (February 15, 2022): 802–7. http://dx.doi.org/10.4028/p-3g2085.

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The article investigates influence of large plastic deformations created in the Bridgman anvils on the mechanical properties and microstructure of metastable alloys of the iron-chromium-nickel system of the austenitic-martensitic class. It is found that the application of deformation in the Bridgman anvils with a true logarithmic deformation e = 6-7 leads to formation of the α-phase (deformation martensite) with significantly higher mechanical properties compared to martensite formed during deformation by linear rolling. The authors reveal the differences in the microstructure of the alloy after deformation in the Bridgman anvils and deformation by rolling, which explain the discovered effect.

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Journal articles on the topic 'Large deformation'

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