International Journal of Solids and Structures最新文献

英文中文

Modified vibro-acoustic spectrum characteristics for underwater cylindrical shells with mechanical metastructures

IF 3.4 3区工程技术 Q1 MECHANICS

International Journal of Solids and Structures

Pub Date : 2025-01-07 DOI: 10.1016/j.ijsolstr.2025.113219

Yaoze Zhuang , Deqing Yang , Qing Li , Xiaoming Geng

The vibro-acoustic spectrum characteristics for underwater thin-walled structures continue to attract attention. This study presents a load-bearing, wide-bandgap metastructure for modifying vibro-acoustic spectrum characteristics of a cylindrical shell. Initially, methods for calculating and evaluating the load-bearing capacity and bandgap characteristics of unit cells are established. Subsequently, an annular metastructure is configured in a cylindrical coordinate, broadening the bandgap and the range of radiated noise suppression through compound unit cells. Finally, by localized mass and reinforcement, the enhancement of macroscopic structural load-bearing capacity and the modified spectrum characteristics are achieved. This study provides a cylindrical shell in which internal vibration transmits through the flange to the shell and then generates radiated noise. The sound power of the assembly which is equipped with either the original support or the metastructures was obtained through experiments and simulations. The experimental study demonstrated a 3.1 dB noise reduction across a broad frequency range from 824 Hz to 1500 Hz, with over 50 % of the frequency characteristics significantly altered. Furthermore, the metastructure achieved a weight reduction of 2.16 kg compared with the original configuration. This study not only achieves the evaluation of the load-bearing capacity of the microscopic unit cell but also realizes the amplitude suppression and spectrum modification of radiated noise for underwater cylindrical shells.

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引用次数: 0

Deployment dynamics of a high strain deployable rolled-up composite SAR antenna

IF 3.4 3区工程技术 Q1 MECHANICS

International Journal of Solids and Structures

Pub Date : 2025-01-04 DOI: 10.1016/j.ijsolstr.2024.113208

Annalisa Tresoldi , Jason Shore , Alfonso Pagani , Guglielmo Aglietti

The Deployable Rolled-up Composite Antenna - Synthetic Aperture Radar (DERCA-SAR) concept design is proposed for a 12U CubeSat low-power remote sensing application. A SAR reflectarray system is considered to be implemented on a High-Strain Composite (HSC) structure with a shallow “tape-measure” inspired shape. The stiffness required in the deployed state is provided by the cross-sectional curvature of the shell, which will be rigidly maintained at the root during stowage. To provide a low-mass solution for this application, the DERCA-SAR technology considers flattening and coiling the shell tip until it reaches the clamped root and deploys by releasing the elastic strain energy stored in the coiled configuration. In this paper, two analytical models are developed to describe the deployment dynamics of this structure and predict the deployment velocity that may impact the antenna performance. Given an initial coil radius

r

, which is much smaller than the natural radius

R

to fit a nanosatellite platform, the deployment occurs in two stages that have been revealed through experiments. The first blossoming phase is described as an expanding and uncoiling process based on the Lagrangian approach. The second and more chaotic phase of the deployment is modelled using a Hencky-type model that discretises the shell’s structure in a multi-pendulum system connected by elastic rotational hinges/springs. In this model, the shell’s stiffness is made to locally change based on the characteristic tape springs’ moment–rotation relationship and the implementation of a stiffness function. The analytical results are then compared to experimental data derived from deployment testing on samples of the shells with different material properties. The predictions from the two models capture the significant trends of the data well, and predict the maximum speed with an error of

<

10 %.

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引用次数: 0

Exploring the elliptic fissure cracking mechanisms from the perspective of sand 3D printing technology and Meshfree numerical strategy

IF 3.4 3区工程技术 Q1 MECHANICS

International Journal of Solids and Structures

Pub Date : 2025-01-04 DOI: 10.1016/j.ijsolstr.2025.113216

Shuyang Yu, Xueying Hu, Zilin Liang

The existences of cracks affect the strength and fracture morphologies of rock masses. However, there are few discussions on factors such as fissure apertures and quantities. Based on this background, sand 3D printing is used to prepare rock-like samples. Crack propagation experiments are carried out on fissured samples with different fissure apertures and fissure numbers. DIC technology is utilized to obtain the full-field strain distributions on specimen surfaces. Meanwhile, a meshless numerical method is developed to simulate rock damage evolutions. Results show that: Three crack types can be seen, wing cracks, shear cracks as well as main cracks. Wing crack extensions on two prefabricated fissures outer sides are along the loading direction, while inner side wing cracks overlap with two prefabricated fissures to form a “fusiformis-shaped part”. The propagation of shear cracks after wing cracks indicates final specimen failure. Main cracks exist in the circumstances with large fissure apertures. As fissure apertures increase, wing cracks initiating points deviate from tips, and the appearance of inner wing cracks in double fissure specimens precedes outer wing cracks. Stress–strain curves of the specimen experience five stages: 1) compressive stage; 2) elastic stage; 3) stress drop stage; 4) crack propagation stage and 5) failure stage. Finally, formation mechanisms of wing cracks, shear cracks, “fusiformis-shaped parts” as well as the mechanical influences of fissure apertures on the specimens are discussed.

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引用次数: 0

Impact attenuation of sphere on woodpile

IF 3.4 3区工程技术 Q1 MECHANICS

International Journal of Solids and Structures

Pub Date : 2025-01-04 DOI: 10.1016/j.ijsolstr.2025.113215

Yuran Jin , Qing Peng , Xiaoming Liu

The woodpile structure shows exceptional cushioning and vibration reduction under impact. The impact, such as the case of a sphere impacting on stacked beams (a beam chain), has been studied using the discrete element method (DEM) in the literature, which shows that the DEM approach is limited to low-frequency vibrations, mostly up to the third harmonic mode triggered by the impact. However, many impact contacts, similar to step loads, will induce high-order modal vibrations (excited eigenmodes beyond the fifth modes). Present work encompasses the higher vibrational modes under such impact. With Timoshenko beams considering shear effect, the dynamics of sphere-woodpile impact is studied by coupling the superposition method for higher modes and the Hertz law for nonlinear contact. Result reveals the high mode vibration greatly reduces the contact force on the stacked beam, thus slender beam can expedite the dissipation of impact energy. Also, the higher-order vibrations enhance the speed of wave propagating within the beam chain and amplify attenuation effects. These insights offer a guidance for the design of impact-resistant structures and advanced shock absorbers.

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引用次数: 0

On the axisymmetric nanoindentation of an exponentially graded coating–substrate structure with both surface and interface effects

IF 3.4 3区工程技术 Q1 MECHANICS

International Journal of Solids and Structures

Pub Date : 2025-01-03 DOI: 10.1016/j.ijsolstr.2024.113211

Youxue Ban, Changwen Mi

This paper investigates the axisymmetric nanocontact of a gradient nanostructure, comprising an exponentially graded coating and a homogeneous half-space, under a rigid spherical indenter. The Steigmann–Ogden surface elastic theory is utilized to model the surface effects at the upper surface of the coating and the interface effects at the coating–substrate boundary. We derive nonclassical boundary conditions and, in conjunction with the displacement continuity across the interface, construct the integral equation describing the nanocontact using the Hankel integral transform. Along with the force equilibrium condition, this equation is discretized and collocated with Gauss–Chebyshev quadratures. An iterative algorithm is developed to solve the resulting algebraic system for contact pressure and radius of the contact circle. Validation against existing literature confirms the accuracy and reliability of the proposed solution method and numerical algorithm. Extensive parametric studies reveal the significant influence of surface and interface effects, the inhomogeneity index of the graded coating, and the indenter radius on nanocontact behavior. The surface effects, characterized by a reduction in contact radius, maximum stress, and subsidence, demonstrate a pronounced size dependency. Notably, soft coatings exhibit a more substantial impact, and the reduction of indenter radius or external load further amplifies these effects. The interface effects, though less pronounced than surface effects, also play a crucial role in affecting contact properties, particularly for hard graded coatings. These findings underscore the importance of considering both surface and interface effects in the design and analysis of nanostructured materials.

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引用次数: 0

Prediction of yield strength anomaly by improved semi-discrete variation Peierls-Nabarro model for L12-ordered alloys Ni3X and Co3X

IF 3.4 3区工程技术 Q1 MECHANICS

International Journal of Solids and Structures

Pub Date : 2025-01-02 DOI: 10.1016/j.ijsolstr.2024.113214

Xiangsheng Hu , Guowei Zeng , Minsheng Huang , Zhenhuan Li , Yaxin Zhu , Lv Zhao

Nickel-based and Cobalt-based superalloys (NBSA and CBSA) are widely used in hot-end components of aero engines for their excellent mechanical properties and special microstructures with both γ and γ’ phases. The γ’ phase exhibits a yield strength anomaly (YSA, i.e., the yield strength increases with the increase of temperature), which can significantly affect the overall mechanical behavior of superalloys. To investigate the necessary conditions for the generation of YSA in these L1₂-ordered NBSAs and CBSAs, the commonly used PPV model is improved with special consideration of the potential type I’ superdislocation core structure, and the related parameters and physical properties of superdislocations are achieved by the enhanced SVPN model including the lattice discreteness effect and by the DFT calculations. It is found that there are three possible superdislocation core structures (i.e., type I, type I’ and type II), but the type I’ core structure has the lowest total energy, and thus the formation of type I’ superdislocation configuration is the most energetically favorable at least when external loading is applied. For this, the influence of type I’ superdislocation on the generation of YSA behavior should be given special consideration. In addition, the energetically favorable type I’ configuration also exhibits the lowest predicted Peierls stress. Further, if the classical PPV model without considering the type I’ configuration is employed, it may give a wrong prediction for the YSA behavior of Ni₃Al, Ni₃Ga, Ni₃Si, Ni₃Ge and Co₃Al_0.5W_0.5. However, by the present improved PPV model, predictions consistent with the experimental observation can be obtained. Consequently, the consideration of type I’ configuration in the present improved PPV model and the employment of enhanced SVPN model with lattice discreteness effect are necessary and appropriate.

{"title":"Prediction of yield strength anomaly by improved semi-discrete variation Peierls-Nabarro model for L12-ordered alloys Ni3X and Co3X","authors":"Xiangsheng Hu , Guowei Zeng , Minsheng Huang , Zhenhuan Li , Yaxin Zhu , Lv Zhao","doi":"10.1016/j.ijsolstr.2024.113214","DOIUrl":"10.1016/j.ijsolstr.2024.113214","url":null,"abstract":"<div><div>Nickel-based and Cobalt-based superalloys (NBSA and CBSA) are widely used in hot-end components of aero engines for their excellent mechanical properties and special microstructures with both <em>γ</em> and <em>γ’</em> phases. The <em>γ’</em> phase exhibits a yield strength anomaly (YSA, <em>i.e.</em>, the yield strength increases with the increase of temperature), which can significantly affect the overall mechanical behavior of superalloys. To investigate the necessary conditions for the generation of YSA in these L1<sub>2</sub>-ordered NBSAs and CBSAs, the commonly used PPV model is improved with special consideration of the potential type <em>I’</em> superdislocation core structure, and the related parameters and physical properties of superdislocations are achieved by the enhanced SVPN model including the lattice discreteness effect and by the DFT calculations. It is found that there are three possible superdislocation core structures (<em>i.e.</em>, type <em>I</em>, type <em>I’</em> and type <em>II</em>), but the type <em>I’</em> core structure has the lowest total energy, and thus the formation of type <em>I’</em> superdislocation configuration is the most energetically favorable at least when external loading is applied. For this, the influence of type <em>I’</em> superdislocation on the generation of YSA behavior should be given special consideration. In addition, the energetically favorable type <em>I’</em> configuration also exhibits the lowest predicted Peierls stress. Further, if the classical PPV model without considering the type <em>I’</em> configuration is employed, it may give a wrong prediction for the YSA behavior of Ni<sub>3</sub>Al, Ni<sub>3</sub>Ga, Ni<sub>3</sub>Si, Ni<sub>3</sub>Ge and Co<sub>3</sub>Al<sub>0.5</sub>W<sub>0.5</sub>. However, by the present improved PPV model, predictions consistent with the experimental observation can be obtained. Consequently, the consideration of type <em>I’</em> configuration in the present improved PPV model and the employment of enhanced SVPN model with lattice discreteness effect are necessary and appropriate.</div></div>","PeriodicalId":14311,"journal":{"name":"International Journal of Solids and Structures","volume":"310 ","pages":"Article 113214"},"PeriodicalIF":3.4,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Non-local orthotropic damage-plastic model for 3D printed materials

IF 3.4 3区工程技术 Q1 MECHANICS

International Journal of Solids and Structures

Pub Date : 2024-12-31 DOI: 10.1016/j.ijsolstr.2024.113210

Denis Linardi, Elisabetta Monaldo, Sonia Marfia

A non-local orthotropic damage and plasticity phenomenological model for 3D printed materials is presented. The model specifically refers to 3D printed structural elements realized with an extrusion-based technique and made with thermoplastic materials.

The structural behavior of the 3D printed component is described with a laminate finite element model based on the first-order shear deformation theory. Each layer of the laminate is described with a non-local orthotropic damage and plastic model. Indeed, the overall mechanical response of 3D printed materials is significantly influenced by plasticity and damage mechanisms that can lead to a range of failure modes from brittle-like to ductile. The proposed orthotropic damage model is based on the introduction of three different damage parameters. Each of them describes a specific damage mechanism, i.e. fiber breakage, fiber detachment and delamination, that is clearly visible from the analysis of the 3D printed samples subjected to experimental tests. Some applications are carried out and the numerical results are compared with experimental results available in literature, highlighting the effectiveness of the proposed modeling technique.

{"title":"Non-local orthotropic damage-plastic model for 3D printed materials","authors":"Denis Linardi, Elisabetta Monaldo, Sonia Marfia","doi":"10.1016/j.ijsolstr.2024.113210","DOIUrl":"10.1016/j.ijsolstr.2024.113210","url":null,"abstract":"<div><div>A non-local orthotropic damage and plasticity phenomenological model for 3D printed materials is presented. The model specifically refers to 3D printed structural elements realized with an extrusion-based technique and made with thermoplastic materials.</div><div>The structural behavior of the 3D printed component is described with a laminate finite element model based on the first-order shear deformation theory. Each layer of the laminate is described with a non-local orthotropic damage and plastic model. Indeed, the overall mechanical response of 3D printed materials is significantly influenced by plasticity and damage mechanisms that can lead to a range of failure modes from brittle-like to ductile. The proposed orthotropic damage model is based on the introduction of three different damage parameters. Each of them describes a specific damage mechanism, i.e. fiber breakage, fiber detachment and delamination, that is clearly visible from the analysis of the 3D printed samples subjected to experimental tests. Some applications are carried out and the numerical results are compared with experimental results available in literature, highlighting the effectiveness of the proposed modeling technique.</div></div>","PeriodicalId":14311,"journal":{"name":"International Journal of Solids and Structures","volume":"310 ","pages":"Article 113210"},"PeriodicalIF":3.4,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Crystal plasticity finite element analysis of 3D mixed-mode notch tip fields in a textured Mg alloy

IF 3.4 3区工程技术 Q1 MECHANICS

International Journal of Solids and Structures

Pub Date : 2024-12-30 DOI: 10.1016/j.ijsolstr.2024.113212

Dhrubjyoti Baruah, R. Narasimhan

In this work, crystal plasticity finite element simulations of notched symmetric and asymmetric four-point bend specimens of a rolled AZ31 magnesium alloy having basal texture are performed. The objective is to understand the 3D nature of mixed-mode notch tip fields in this alloy and to compare the numerical results with previously reported experiments. To assess anisotropy effects, the analysis is conducted for two notch orientations, as well as for a material obeying the

J_{2}

flow theory of plasticity, corresponding to one of the specimens. The macroscopic results agree quite well with experiments. Strong thickness variations of plastic slips, tensile twin volume fraction, and stresses are observed, which however depend on notch orientation and mode-mixity. Finally, the implications of the results for failure near the notch tip are discussed and corroborated with experimental observations.

引用次数: 0

Peridynamics for multi-physics coupling to simulate cracking in fuel rods

IF 3.4 3区工程技术 Q1 MECHANICS

International Journal of Solids and Structures

Pub Date : 2024-12-28 DOI: 10.1016/j.ijsolstr.2024.113203

Qi-Qing Liu , D.H. Hao , Y.L. Hu , Yin Yu , Q.Z. Wang , E. Madenci

This study presents a new coupled multi-physics model based on Bond-Associated Non-Ordinary State-Based Peridynamics (BA-NOSB PD) to investigate the mechanical behavior and crack patterns of fuel rods. Unlike the existing PD coupled multi-physics models, this novel PD model for the first-time accounts for the irradiation-induced behaviors such as densification, swelling, and creep. Also, it captures the Pellet and Cladding Interaction (PCI) under realistic boundary conditions. Furthermore, random critical stretch values with normal distribution within the fuel rods lead to realistic crack pattern of fuel rods during prolonged irradiation. The crack pattern of fuel rods with irradiation is compared with those without irradiation. The results show that the fuel pellet initially shrinks and then expands as burnup rises, while cladding consistently shrinks inward until gap closure, with its compressive state relieved by PCI. Associated with the damage in fuel rods, radial cracks occur during the power rise, while circumferential cracks mainly form during the densification stage, and only few secondary circumferential cracks occur during power ramp-down. The displacement of damaged pellet increases slowly as burnup rises, and the gap closure time is greatly delayed compared with that of an undamaged pellet.

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引用次数: 0

A LATIN-PGD reduced order approximation dedicated to the solution of an optimal control based identification strategy for non-linear constitutive parameters

IF 3.4 3区工程技术 Q1 MECHANICS

International Journal of Solids and Structures

Pub Date : 2024-12-28 DOI: 10.1016/j.ijsolstr.2024.113189

Mainak Bhattacharyya, Pierre Feissel

The objective of the research is to obtain deterministic identification of non-linear material parameters from full field measurements of kinematic data acquired from digital image correlation (DIC). The inverse problem involves proposal of the optimal control approach, considered to be a variant of modified constitutive relation error (MCRE), where the complete knowledge of the boundary conditions and the measurement data are not required. The optimisation problem essentially translates into minimisation of a quadratic functional under non-linear constraints. The non-linear optimisation is solved through the iterative large time increment (LATIN) method. A proper generalised decomposition (PGD) based reduced order approximation is also incorporated in this procedure for the sake of numerical frugality of the iterative method. Finally, a few numerical examples are depicted that establish the efficacy of the methodology.

引用次数: 0

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