Article
Mechanics
Shengya Li, Yiqi Mao, Wenyang Liu, Shujuan Hou
Summary: This paper presents a multiscale finite element solution procedure based on the Nonlinear Criterion Function (NLCF) switching criteria to reduce computation time and storage costs in nonlinear multiscale analysis of large composite structures. The method decomposes the macroscopic integration point into linear and nonlinear stages, using finite element-based homogenization (FEH) approach and multi-level finite element approach (FE2) respectively, to achieve a hybrid solution. The NLCF is established to switch the two methods on-the-fly at the macroscopic integration point. The effectiveness and efficiency of the hybrid FEH + FE2 technique are verified through numerical examples and an industrial application.
COMPOSITE STRUCTURES
(2023)
Article
Computer Science, Interdisciplinary Applications
Yeon-Ho Jeong, Seung-Hwan Boo, Solomon C. Yim
Summary: In this manuscript, a new effective method for eigenpair reanalysis of large-scale finite element (FE) models is proposed. This method utilizes the matrix block-partitioning algorithm in the Rayleigh-Ritz approach and expresses the Ritz basis matrix using thousands of block matrices of very small size. A new formulation is derived to avoid significant computational costs from the projection procedure. An algorithm is presented to recognize which blocks are changed in the modified FE model to achieve computational cost savings when computing new eigenpairs. The performance of the proposed method is demonstrated by solving several practical engineering problems and comparing the results with other methods.
JOURNAL OF COMPUTATIONAL DESIGN AND ENGINEERING
(2023)
Article
Engineering, Mechanical
H. Heyraud, C. Robert, C. Mareau, D. Bellett, F. Morel, N. Belhomme, O. Dore
Summary: A numerical two-scale approach is proposed to calculate non-local multiaxial equivalent stress at the weld toe and root of welded structures. The method is shown to be robust in different geometries and loading cases, with parameters not significantly affecting stiffness behavior. This approach shows promise for fatigue design of welded structures when compared to full solid finite element models.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Civil
Luca Breseghello, Hamed Hajikarimian, Henrik Broner Jorgensen, Roberto Naboni
Summary: This paper presents a workflow for the design, material testing, and numerical simulation of shape-optimised reinforced 3D Concrete Printed (3DCP) beams. The proposed method includes the development of a lossless data transfer tool and a Finite Element Analysis (FEA) model. The tests confirmed the reliability of the numerical model and showed that the proposed 3DLightBeam+ design has a higher flexural strength-to-weight ratio than comparable beams.
ENGINEERING STRUCTURES
(2023)
Article
Mechanics
St. Gesell, R. Ganesh, M. Kuna, B. Fedelich, B. Kiefer
Summary: Crack propagation under low cycle fatigue and thermomechanical fatigue is characterized by high plastic and creep strains that require different approaches for quantifying crack growth. The cyclic crack tip opening displacement (ACTOD) is investigated as a promising loading parameter. A viscoplastic temperature dependent material model is used along with special crack tip elements for accurate calculation. An efficient FE-technique is developed for simulating fatigue crack growth by successive remeshing and recommendations are made for important numerical control parameters.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Mechanics
An Le, Sanjay Nimbalkar, Navid Zobeiry, Sardar Malek
Summary: This paper investigates the bending response of cured and uncured viscoelastic composite laminates at different loading rates using a three-dimensional multi-scale modelling framework. The study aims to understand the effect of fibre waviness on wrinkling evolution during the forming process of advanced composites. The results show that the proposed multi-scale modelling framework is effective in predicting the behaviour of viscoelastic composites with various yarn architectures.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Mechanical
Grzegorz Glodek, Reza Talemi
Summary: This research proposes an applied approach to predict the fretting fatigue lifetime of a dovetail joint using experimental results and numerical models. The accuracy of the method is validated by comparing the predicted lives to the experimental data.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Construction & Building Technology
Christina El Sawda, Fateh Fakhari Tehrani, Joseph Absi, Christophe Petit, Philippe Reynaud
Summary: The mechanical properties of asphalt mixtures depend on the characteristics of its mastic, which includes bitumen and fillers. This paper focuses on numerically computing and assessing the complex modulus and fatigue of bituminous materials. A numerical method based on a heterogeneous multiscale approach was used to evaluate fatigue damage. The results showed good agreement with experimental data, with less than ten percent error.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Engineering, Multidisciplinary
K. Tuma, M. Rezaee-Hajidehi, J. Hron, P. E. Farrell, S. Stupkiewicz
Summary: This study investigates large-scale 3D martensitic microstructure evolution problems using a finite-element discretization of a finite-strain phase-field model. The model incorporates various crystallography of transformation and elastic anisotropy of the phases, and demonstrates robustness and good parallel scaling performance in a 3D simulation of microstructure evolution during nano-indentation. The finite-element discretization relies on the PETSc solver library and efficiently solves the large systems of linear equations arising from the model.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Computer Science, Artificial Intelligence
Ning Ding, Yujia Qin, Guang Yang, Fuchao Wei, Zonghan Yang, Yusheng Su, Shengding Hu, Yulin Chen, Chi-Min Chan, Weize Chen, Jing Yi, Weilin Zhao, Xiaozhi Wang, Zhiyuan Liu, Hai-Tao Zheng, Jianfei Chen, Yang Liu, Jie Tang, Juanzi Li, Maosong Sun
Summary: With the rise of pre-trained language models (PLMs) and the pre-training-fine-tuning approach, it has become clear that larger models generally achieve better performance. However, scaling up PLMs leads to high costs and impracticality in terms of fine-tuning and storing all parameters. To address this, parameter-efficient adaptation of PLMs, known as delta-tuning, focuses on optimizing a subset of parameters while keeping the rest fixed, reducing computation and storage costs. This article discusses and analyzes the different approaches of delta-tuning and explores their correlations and differences, providing a unified categorization criterion. Theoretical principles underlying the effectiveness of delta-tuning are also discussed, along with an empirical study on numerous natural language processing tasks.
NATURE MACHINE INTELLIGENCE
(2023)
Article
Engineering, Multidisciplinary
Jeffrey Belding, Monika Neda, Rihui Lan
Summary: In this paper, a finite element study is conducted for the family of Time Relaxation models using the EMAC discretization method. The conservation properties, stability, and error estimates are analyzed in the fully discrete case, and comparisons with the classical skew symmetric non-linear formulation are made. It is shown that the error estimate for EMAC is improved compared to the skew symmetric scheme, and numerical experiments in 2D and 3D demonstrate the advantage of EMAC over skew symmetric.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Construction & Building Technology
Sadjad Naderi, Mingzhong Zhang
Summary: This study used a novel computational framework to simulate the fracture process of concrete under static and dynamic tensile loading, revealing the significant role of irregularly shaped coarse aggregates in micro-crack nucleation and ultimate fracture pattern, while showing an insignificant effect on the tensile strength of concrete.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Engineering, Mechanical
A. Chiocca, F. Frendo, G. Marulo
Summary: Fatigue of structural components is a significant issue in both scientific and industrial communities, and extensive research is being conducted to address it. The standard methods for calculating critical plane factors are time-consuming and may not be suitable for complex geometries or tight time scheduling. This study presents an efficient algorithm that utilizes tensor invariants and coordinates transformation law to calculate critical plane factors, specifically focusing on the Fatemi-Socie factor. The algorithm was tested on various geometries and loading conditions, demonstrating a significant reduction in computation time without sacrificing solution accuracy.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Multidisciplinary
Marlini Simoes, Emilio Martinez-Paneda
Summary: A new phase field framework is presented for modeling fracture and fatigue in Shape Memory Alloys (SMAs), showcasing its potential in capturing main fracture features associated with SMAs. The model demonstrates capabilities in handling crack tip fields and complex cracking phenomena, such as unstable crack growth and mixed-mode fracture. Additionally, the framework is extended to fatigue to capture crack nucleation and propagation in biomedical stents using nitinol SMAs.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Engineering, Mechanical
Adnan Kefal, Isa Emami Tabrizi, Mehmet Yildiz, Alexander Tessler
Summary: The smoothed inverse finite element method (iFEM((s))) combines the inverse finite element method (iFEM) and the smoothing element analysis (SEA) for real-time displacement field reconstruction using strain-sensor measurements. This method is validated for shape sensing in multilayered composite and sandwich structures. By incorporating refined zigzag theory (RZT), the approach accurately models through-the-thickness displacement distributions and accurately predicts structural shapes.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)