Continuum Mechanics and Thermodynamics最新文献_第3页

Analysis of temperature changes in living tissue using the modified fractional thermal conduction model under laser heat flux on the skin surface 激光热流作用下活体组织温度变化的改进分数热传导模型分析

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-12-10 DOI: 10.1007/s00161-024-01343-y

Ahmed E. Abouelregal, Rasmiyah A. Alharb, Murat Yaylacı, Badahi Ould Mohamed, Sami F. Megahid

{"title":"Analysis of temperature changes in living tissue using the modified fractional thermal conduction model under laser heat flux on the skin surface","authors":"Ahmed E. Abouelregal, Rasmiyah A. Alharb, Murat Yaylacı, Badahi Ould Mohamed, Sami F. Megahid","doi":"10.1007/s00161-024-01343-y","DOIUrl":"10.1007/s00161-024-01343-y","url":null,"abstract":"<div><p>The use of thermal conduction models, particularly the double-phase lag thermal wave model, is vital for improving thermal therapies in biological tissues. However, existing models have limitations that hinder their practical application. This paper introduces a modified Pennes fractional thermal equation for biological heat transfer that integrates the double-phase lag concept and the fractional Atangana-Baleanu operator with a non-singular kernel. The model’s predictions were validated against measured temperature responses of laser-irradiated skin tissue and compared to established models. A one-dimensional layer of human skin tissue was analyzed using the Laplace transform method, with graphical results for each scenario. The comparative analysis showed that the AB fractional model outperforms other fractional models in capturing memory effects related to temperature variations and accurately models thermal interactions in living tissues while considering time delays. These findings highlight the model’s potential to improve the design and optimization of thermal therapies in clinical practice.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"37 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142796906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Evaluating corneal biomechanics using shear wave elastography and finite element modeling: sensitivity analysis and parametric optimization 利用剪切波弹性成像和有限元模型评估角膜生物力学：敏感性分析和参数优化

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-12-08 DOI: 10.1007/s00161-024-01340-1

Pouria Mazinani, Christian Cardillo, Peiman Mosaddegh

{"title":"Evaluating corneal biomechanics using shear wave elastography and finite element modeling: sensitivity analysis and parametric optimization","authors":"Pouria Mazinani, Christian Cardillo, Peiman Mosaddegh","doi":"10.1007/s00161-024-01340-1","DOIUrl":"10.1007/s00161-024-01340-1","url":null,"abstract":"<div><p>This study presents a comprehensive analysis of corneal biomechanics using shear wave elastography, leveraging finite element modeling to investigate the mechanical properties of corneal tissue. A 3D axis-symmetric corneal model was developed and subjected to various simulated conditions, including changes in intraocular pressure (IOP), boundary conditions, excitation pressure, and corneal curvature. The model incorporates hyper-viscoelastic material properties, allowing for an accurate representation of the cornea nonlinear behavior within physiological pressure ranges. Parametric studies were conducted to assess the sensitivity of shear wave velocity to variations in corneal biomechanical parameters. The results revealed that intrinsic material properties, particularly viscoelastic constants, significantly influence shear wave propagation, while external factors such as IOP and boundary conditions have minimal impact. The study also employed the Taguchi method for parametric optimization, identifying the first relaxation time as a critical factor affecting shear wave velocity. This work offers valuable insights into corneal biomechanics, with implications for improving diagnostic techniques and enhancing our understanding of corneal behavior under different physiological conditions. The findings support the potential application of shear wave elastography as a non-invasive tool for assessing corneal stiffness and advancing clinical practice in ophthalmology.\u0000</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"37 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Thermomechanical process modelling and simulation for additive manufacturing of nanoparticle dispersed Inconel 718 alloys 纳米颗粒分散Inconel 718合金增材制造的热力学过程建模与仿真

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-12-06 DOI: 10.1007/s00161-024-01346-9

E. Yousefimiab, A. Kendibilir, Y. Yalcin, C. Cardillo, E. Aydogan, A. Kefal

{"title":"Thermomechanical process modelling and simulation for additive manufacturing of nanoparticle dispersed Inconel 718 alloys","authors":"E. Yousefimiab, A. Kendibilir, Y. Yalcin, C. Cardillo, E. Aydogan, A. Kefal","doi":"10.1007/s00161-024-01346-9","DOIUrl":"10.1007/s00161-024-01346-9","url":null,"abstract":"<div><p>In this study, a coupled transient thermomechanical finite element model is developed to examine the laser powder bed fusion (L-PBF) process of the Inconel 718 (IN718) and Oxide Dispersion Strengthened (ODS) superalloys (ODS-IN718). The linear isotropic elastic perfectly plastic constitutive model is implemented for the mechanical part whereas all the thermophysical properties are defined as fully temperature dependent. This new model enables three states of the metal including powder, liquid, and solid phases in the continuum-based finite element simulations. Besides, it can meticulously simulate multi-layered samples to assess thermomechanical performance and residual stress between layers. First, benchmark problems are revisited to verify the high accuracy of the present model for predicting transient temperature profile and residual stress accumulation. Then, thermomechanical analysis of a single-track three-layer test case is performed to investigate the L-PBF process of IN718 and ODS-IN718 samples for various laser powers and scan speeds. Also, the thermal characterization of ODS-IN718 samples is experimentally conducted. It is demonstrated that the numerical melt pool dimensions provide good agreement with experiments with an average error of 17% for melt pool dimensions. Moreover, mechanical results reveal that high tensile residual stresses accumulate in the middle part of the track. The manufacturing quality of the IN718 and ODS-IN718 samples are comprehensively compared based on the variations of stress distribution at different layers for different laser scan speeds. Also, the optimal laser scan speed is achieved to minimize the residual stresses for the ODS-IN718 alloy. Overall, ODS-IN718 has a lower residual stress than IN718 especially at lower laser scan speeds due to the enhanced thermomechanical behavior attributed to the change in material properties due to the presence of dispersed particles.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"37 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142788722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Large deformation plasticity without ({textbf {F}}^e{textbf {F}}^p): a basic Riemannian geometric model for metals 没有({textbf {F}}^e{textbf {F}}^p)的大变形塑性：金属的基本黎曼几何模型

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-12-04 DOI: 10.1007/s00161-024-01339-8

Anil Pathrikar, Debasish Roy

{"title":"Large deformation plasticity without ({textbf {F}}^e{textbf {F}}^p): a basic Riemannian geometric model for metals","authors":"Anil Pathrikar, Debasish Roy","doi":"10.1007/s00161-024-01339-8","DOIUrl":"10.1007/s00161-024-01339-8","url":null,"abstract":"<div><p>We propose a continuum viscoplasticity model for metals where the kinematic aspects and those pertaining to microstructural reorganizations are intrinsically described through Riemannian geometry. Towards this, in addition to a Euclidean deformed manifold, we introduce a time-parametrized Riemannian material manifold where a metric tensor characterizes the irreversible configurational changes due to moving defects, e.g. dislocations or grain boundaries causing plastic deformation. Moreover, we also make use of a time-parametrized Euclidean reference manifold which shares the same macroscopic shape/size as the material manifold. The setup dispenses with the need for a multiplicative decomposition of the deformation gradient. Constitutive closure of the unknown fields, appearing in the metric tensor, is organised through two-temperature non-equilibrium thermodynamics. The approach naturally leads to terms containing higher order gradients of variables describing plastic deformation. Use of the virtual power principle yields a macroscopic force balance for mechanical deformation and a microscopic force balance giving the nonlocal flow rule. Evolution equations for the two temperatures are also coupled with plastic deformation. Numerical simulations on homogeneous and inhomogeneous deformation in oxygen-free high conductivity copper are carried out to validate the model. Simulations of an inhomogeneous deformation scenario, the Taylor impact test to wit, are then performed. To further explore the model, we simulate shear band propagation in a doubly notched plate under impact. The study offers interesting insights into the role of Riemann curvature in band formation.\u0000</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"37 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142761705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Boundary excitation of localized oscillatory waves in a metamaterial 超材料中局域振荡波的边界激发

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-12-02 DOI: 10.1007/s00161-024-01349-6

A. V. Porubov, N. M. Bessonov, O. S. Loboda, Y. Asaturova

引用次数: 0

A multi-scale analysis to predict elastic response in different weight fractions of carbon fiber powder 碳纤维粉末不同重量组分弹性响应的多尺度预测

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-11-29 DOI: 10.1007/s00161-024-01344-x

Fatih Huzeyfe Öztürk

{"title":"A multi-scale analysis to predict elastic response in different weight fractions of carbon fiber powder","authors":"Fatih Huzeyfe Öztürk","doi":"10.1007/s00161-024-01344-x","DOIUrl":"10.1007/s00161-024-01344-x","url":null,"abstract":"<div><p>In this study, the effect of varying weight percentages of carbon fiber powder (CFP) (10 wt.%, 20 wt.% and 30 wt.%) on the mechanical properties of polycarbonate (PC) components produced by plastic injection molding was investigated using analytical, numerical and experimental methods. This research is a novel study in terms of comparing experimental data with microscopic features and full-scale analysis. The micro-scale study was carried out using the Halpin-Tsai (HT) and Generalized Modified Halpin Tsai (G-HT) models as well as the representative volume element (RVE). Findings from RVE were then transferred to the finite element analysis (FEA) module for full-scale comprehensive analysis. A comparison of the experimental tensile test results demonstrated an increase of 56.90% and 191.47% in the tensile strength and Young’s modulus of the composite containing 30 wt. % CFP compared to pure PC, respectively. The minimum and maximum differences between Young’s modulus and the experimental Young’s modulus were determined to be 0.39% and 7.92% using RVE and G-HT, respectively. The maximum and minimum value of the difference between experimental and FEA strengths were determined as 3.44% and 1.91%, respectively. Young’s modulus of the composite with increasing fiber weight ratio was successfully predicted by RVE, G-HT and FEA.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"37 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142752982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

A bone remodeling model involving two mechanical stimuli originated from shear and normal load conditions within the 3D continuum mechanics framework 在三维连续介质力学框架内，骨重塑模型涉及源自剪切和正常载荷条件的两种机械刺激

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-11-26 DOI: 10.1007/s00161-024-01347-8

Natalia Branecka, Matin Shanehsazzadeh, M. Erden Yildizdag, Ivan Giorgio

{"title":"A bone remodeling model involving two mechanical stimuli originated from shear and normal load conditions within the 3D continuum mechanics framework","authors":"Natalia Branecka, Matin Shanehsazzadeh, M. Erden Yildizdag, Ivan Giorgio","doi":"10.1007/s00161-024-01347-8","DOIUrl":"10.1007/s00161-024-01347-8","url":null,"abstract":"<div><p>We propose a three-dimensional macroscopic continuum model designed to predict the remodeling phenomenon of bone tissue. In the proposed model, we focus on the evolution of two crucial stiffness parameters: the bulk and shear moduli. These parameters independently adapt to the mechanical demands to which bone tissue is subjected, mainly to withstand hydrostatic and deviatoric deformations. These mechanical stimulations influence the activity of bone cells, leading to changes in bone structure and strength and, in turn, the above-mentioned moduli. The formulation is simplified, serving as an initial step towards a more comprehensive modeling approach. The evolution of these stiffness parameters is proposed based on an energetic argument to describe the functional adaptation process. Numerical experiments, conducted on a cylindrical specimen resembling a femur, demonstrate the feasibility of modeling the bone remodeling process with distinct evolutions for multiple material parameters, in contrast to the conventional approach that permits only one-parameter evolution.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"37 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142713266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Study of two-dimensional nonlinear coupled time-space fractional order reaction advection diffusion equations using shifted Legendre-Gauss-Lobatto collocation method 使用移位 Legendre-Gauss-Lobatto 配位法研究二维非线性耦合时空分数阶反应平流扩散方程

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-11-23 DOI: 10.1007/s00161-024-01338-9

Anjuman, Manish Chopra, Subir Das, Holm Altenbach

引用次数: 0

Towards the Galerkin approximation of tetraskelion metamaterials 实现四重超材料的伽勒金近似

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-11-23 DOI: 10.1007/s00161-024-01334-z

Ryan McAvoy, Emilio Barchiesi

{"title":"Towards the Galerkin approximation of tetraskelion metamaterials","authors":"Ryan McAvoy, Emilio Barchiesi","doi":"10.1007/s00161-024-01334-z","DOIUrl":"10.1007/s00161-024-01334-z","url":null,"abstract":"<div><p>The connection of two orthogonal families of parallel equispaced duoskelion beams results in a 2D microstructure characterizing so-called tetraskelion metamaterials. In this paper, based on the homogenization results already obtained for duoskelion beams, we retrieve the internally-constrained two-dimensional nonlinear Cosserat continuum describing the in-plane mechanical behaviour of tetraskelion metamaterials when rigid connection is considered among the two families of duoskelion beams. Contrarily to duoskelion beams, due to the dependence of the deformation energy upon partial derivatives of kinematic quantities along both space directions, the limit model of tetraskelion metamaterials cannot be reduced to an initial value problem describing the motion of an unconstrained particle subjected to a potential. This calls for the development of a finite element formulation taking into account the internal constraint. In this contribution, after introducing the continuum describing tetraskelion metamaterials in terms of its deformation energy, we exploit the Virtual Work Principle to get governing equations in weak form. These equations are then localised to get the equilibrium equations and the associated natural boundary conditions. The feasibility of a Galerkin approach to the approximation of tretraskelion metamaterials is tested on duoskelion beams by defining two different equivalent weak formulations that are discretised and then solved by a Newton–Rhapson scheme for clamped-clamped pulling/pushing tests. It is concluded that, given the high nonlinearity of the problem, the choice of the initial guess is crucial to get a solution and, particularly, a desired one among the several bifurcated ones.</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"37 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142690697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

An analytical model for debonding of composite cantilever beams under point loads 点荷载下复合材料悬臂梁脱粘的分析模型

IF 1.9 4区工程技术

Continuum Mechanics and Thermodynamics Pub Date : 2024-11-20 DOI: 10.1007/s00161-024-01332-1

Marcin Białas, Giuliano Aretusi

{"title":"An analytical model for debonding of composite cantilever beams under point loads","authors":"Marcin Białas, Giuliano Aretusi","doi":"10.1007/s00161-024-01332-1","DOIUrl":"10.1007/s00161-024-01332-1","url":null,"abstract":"<div><p>The paper presents an analytical model to study the shear driven debonding of a composite cantilever beam subjected to a point load. The composite structure consists of two elastic beams connected by an interface layer, and the model uses cohesive zone models to simulate the degradation process at the joint. These cohesive zone models are characterized by non-continuous and linear softening in the relationship between shear stress and relative tangential displacement. The results are expressed using non-dimensional parameters, and the model yields quasi-static equilibrium paths that demonstrate snap-back responses in both force and displacement values. The significance of the research lies in its application to structural engineering, where composite materials are extensively used. The study emphasizes the critical role of the interface layer strength in maintaining the structural integrity of composites. The proposed model advances the understanding of debonding by introducing a constitutive relation for the interface that accounts for the step-wise change in mechanical properties. The governing equations for the cantilever beam are derived, considering the equilibrium of forces and moments, and the relative tangential displacement at the interface. The model delineates three stages of interface degradation: no relative slip, plastic deformation, and progressive debonding. The analytical solutions for each stage provide insights into the beam deflection, shear stress, and axial force distribution. This research contributes to the field by offering a more refined analytical approach to study debonding in composite beams, which is essential for improving the design and analysis of composite structures.\u0000</p></div>","PeriodicalId":525,"journal":{"name":"Continuum Mechanics and Thermodynamics","volume":"37 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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