Article
Mechanics
D. Pranavi, A. Rajagopal, J. N. Reddy
Summary: The proposed phase field model considers interfacial damage for different fiber configurations in composite materials, introducing anisotropy and capturing distinct contributions of fibers and matrix in elastic equilibrium. By considering factors such as fiber orientation, interface properties, and laminate configuration, the model captures predominant failure phenomena in composite materials.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Composites
Wei Tan, Emilio Martinez-Paneda
Summary: The computational framework accurately captures the crack path, interface debonding, and load versus displacement response of fiber-reinforced polymer composites. Sensitivity analysis on the crack growth resistance curve to matrix fracture toughness and fiber-matrix interface properties, as well as the influence of porosity on the R-curve, provide insights into microscopic fracture mechanisms and pave the way for efficient design of high fracture toughness composites.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Dongxu Liu, Songyun Ma, Huang Yuan, Bernd Markert
Summary: This study develops an anisotropic poro-visco-hyperelastic-damage model to analyze the time-dependent fracture behavior of hydrogel composites. The model includes the coupling relationship between visco-hyperelasticity and fluid transport and describes the visco-hyperelasticity of the polymer networks and the fluid transport through the porous polymer networks. In addition, a continuum damage model is proposed to describe the mechanical degradation of hydrogel composites. The proposed model is validated through numerical simulations.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Mechanics
Sathiskumar Anusuya Ponnusami, Jayaprakash Krishnasamy, Sergio Turteltaub, Sybrand Van der Zwaag
Summary: The influence of the cohesive zone length on the crack driving force in a system of particles dispersed in a composite material matrix is analyzed. The study shows that the process zone length scale parameter has a critical influence on the magnitude and direction of the crack driving force. Numerical simulations demonstrate that the driving force magnitude is directly dependent on the length scale parameter, and the presence of a cohesive zone significantly affects the direction of the driving force.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
L. Chen, R. de Borst
Summary: This article introduces the modeling of discrete interfaces in the phase field regularization framework and compares the applicability of different phase field models. The method combines the advantages of discrete and smeared approaches to improve the accuracy of interface modeling. The effectiveness of the method is demonstrated through several numerical examples.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Materials Science, Composites
Yuki Fujita, Satoshi Noda, Junichi Takahashi, Emile S. Greenhalgh, Soraia Pimenta
Summary: This paper investigates the fracture behavior of injection-moulded short-fibre composites and finds that the fracture toughness of the material increases with increasing fibre orientation, moisture content, and temperature. The increase in toughness is related to changes in failure and toughening mechanisms.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Zongchen Li, Xiaoli Jiang, Hans Hopman, Christian Affolter
Summary: This paper introduces a novel analytical approach for predicting the growth of surface cracks in metallic pipes reinforced with Fibre-Reinforced Polymers (FRPs) under cyclic bending and/or tension loads. The proposed approach considers multiple factors simultaneously and enables accurate evaluations of stress intensity factors (SIFs). An in-house program has been developed for automated predictions. The proposed approach has been validated and demonstrates accuracy in estimating fatigue lives.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
M. T. Aranda, I. G. Garcia, A. Quintanas-Corominas, J. Reinoso
Summary: This study investigates the parameters setting of curved weak interfaces as crack arrestors in structures. It is found that the ratio of interface to bulk fracture toughness has a clear effect on crack deviation. However, the results vary among different analysis methods due to their different assumptions.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Polymer Science
Zhen Pei Chow, Zaini Ahmad, King Jye Wong, Seyed Saeid Rahimian Koloor, Michal Petru
Summary: This paper proposes a temperature-dependent cohesive model for predicting the delamination of dissimilar metal-composite material hybrids under Mode-I and Mode-II. The model was validated by comparing simulation and experimental results at 30, 70, and 110 degrees C. The Mode-I and Mode-II FE models showed good correlation with experimental tests, with discrepancies of 5.73% and 7.26% respectively.
Article
Mechanics
T. Laschuetza, Th. Seelig
Summary: The role of inertia effects during crack formation under non-singular static pre-stress is investigated using a linear softening cohesive zone model. In the case of a 1D tensile bar, about one third of the released strain energy is converted into kinetic energy during the finite time of decohesion. Results from dynamic finite element analyses using the same cohesive zone model are compared with predictions from finite fracture mechanics in the case of crack initiation from a circular hole in a 2D plate under remote tension or compression, showing a complex dependence on the hole radius. Both methods capture the critical load for crack initiation at the hole well, but only the numerical cohesive zone model analyses resolve the highly transient process of crack nucleation.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
Lei Zhang, Zeyang Li, Hanyu Zhang, Zhao Liu, Ping Zhu
Summary: This paper proposes a novel micromechanical fatigue model for precisely explaining the fatigue failure mechanism and predicting the fatigue life of SFRP composites. Through numerical analysis and experimental verification, the results show that the progressive fatigue damage of each constituent can be quantitatively analyzed, and the S-N data of SFRP can be well predicted, which can improve the durability of SFRP components.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Composites
Denizhan Yavas, Ziyang Zhang, Qingyang Liu, Dazhong Wu
Summary: This study investigates the inter-layer and cross-layer fracture behavior of 3D printed short CFRP composites through experimental and numerical methods. The cross-layer fracture toughness was found to be three-fold of the inter-layer counterparts. Fracture surface morphology and crack-tip strain field demonstrated different toughening mechanisms for cross-layer and inter-layer fractures.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Composites
Sina AhmadvashAghbash, Christian Breite, Mahoor Mehdikhani, Yentl Swolfs
Summary: Longitudinal fibre-matrix debonding is influenced by various factors such as interfacial strength, fracture toughness, thermal residual stresses, friction, and matrix plasticity. The proposed finite element model accounts for these factors and allows for debond propagation based on assigned interfacial properties. Parametric studies demonstrate that higher values for interfacial friction coefficient, thermal residual stress, and interfacial fracture toughness restrict debond propagation, while matrix plasticity facilitates it.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Mohamed Saidi, Nadege Reboul, Aron Gabor
Summary: This paper presents an experimental study on the local and global mechanical behaviors of textile-reinforced cementitious matrix composites (TRCs) under cyclic loading, testing two configurations and three loading modes. Fiber optic sensors were used to study local behavior at the textile/matrix interface, while digital image correlation technique assessed crack width evolution.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Engineering, Biomedical
Marta Alloisio, Christian Gasser
Summary: In this study, a parameter identification pipeline was proposed to extract tissue properties from force-displacement and digital image correlation (DIC) data, which play a crucial role in understanding the fracture properties of vascular tissue. The model closely replicated the experimental observations and identified the fracture energies of the porcine aorta. The findings reveal the lower strength of the abdominal aorta and have significant implications for the clinical evaluation of the risk of aortic rupture.
ACTA BIOMATERIALIA
(2023)
Article
Forestry
I. Robert Kliger, Reza Haghani, Maurice Brunner, Annette M. Harte, Kay-Uwe Schober
EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS
(2016)
Article
Engineering, Multidisciplinary
Mohsen Heshmati, Reza Haghani, Mohammad Al-Emrani
COMPOSITES PART B-ENGINEERING
(2016)
Article
Materials Science, Composites
Valbona Mara, Reza Haghani, Mohammad Al-Emrani
JOURNAL OF COMPOSITE MATERIALS
(2016)
Article
Materials Science, Multidisciplinary
Mohsen Heshmati, Reza Haghani, Mohammad Al-Emrani
MATERIALS & DESIGN
(2017)
Article
Engineering, Civil
Jincheng Yang, Reza Haghani, Mohammad Al-Emrani
ENGINEERING STRUCTURES
(2019)
Article
Engineering, Civil
Jincheng Yang, Morgan Johansson, Mohammad Al-Emrani, Reza Haghani
Summary: This paper introduces an innovative method of using prestressed CFRP plates for strengthening RC beams by achieving self-anchorage. Experimental tests showed significant improvements in flexural performance, with a utilization ratio of 81% at debonding. Numerical analyses were conducted to investigate the effect of prestressing levels and CFRP plate stiffness on flexural behavior.
ENGINEERING STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
H. A. Mobaraki, R-A Jafari-Talookolaei, P. S. Valvo, R. Haghani
Summary: The study involved dynamic analysis of a laminated composite plate with a piezoelectric energy harvester under the influence of a moving vehicle. Various parameters such as layups, harvester length, and piezoelectric material properties were considered to investigate their effects on electrical output. The finite element method and Newmark's method were used to solve the discretized equations for both free and forced vibrations of the composite plate.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
H. A. Mobaraki, R. -A. Jafari-Talookolaei, P. S. Valvo, R. Haghani
Summary: This paper provides a finite element analysis of laminated composite plates under the action of a moving vehicle. The effects of the vehicle's motion and system parameters on the dynamic response are investigated.
FRATTURA ED INTEGRITA STRUTTURALE-FRACTURE AND STRUCTURAL INTEGRITY
(2022)
Article
Engineering, Civil
Erik Olsson, J. Toby Mottram, Mohammad Al-Emrani, Reza Haghani
Summary: This article presents 24 non-dimensional buckling curves that estimate the strengths of FRP square plates with four simply supported edges under in-plane uniaxial and uniform in-plane compression. The curves are constructed through a parametric numerical analysis using ABAQUS (R) software, considering variables such as material properties, initial geometrical imperfections, laminate lay-ups, and plate thicknesses. These strength curves represent the relationship between the buckling reduction factor and plate slenderness, while accounting for post-buckling strength. The authors propose a unified buckling design curve, which is benchmarked against experimental test results and shows reasonable agreement. They recommend introducing this curve into structural design standards for FRP plates.
THIN-WALLED STRUCTURES
(2023)
Article
Construction & Building Technology
Reza Haghani, Jincheng Yang, Marte Gutierrez, Christopher D. Eamon, Jeffery Volz
Summary: Soil-steel composite bridges (SSCB) are increasingly popular for short-span bridges due to their low cost, rapid construction, and adaptability. These bridges gain strength over time from soil consolidation, but their load-carrying capacity depends on the condition of the steel arch element. Corrosion is a major drawback, especially for bridges over waterways, and replacing steel with FRP composites can improve durability and reduce maintenance costs.
Proceedings Paper
Energy & Fuels
A. Andre, J. Kullberg, D. Nygren, C. Mattsson, G. Nedev, R. Haghani
41ST RISO INTERNATIONAL SYMPOSIUM ON MATERIALS SCIENCE: MATERIALS AND DESIGN FOR NEXT GENERATION WIND TURBINE BLADES
(2020)
Proceedings Paper
Engineering, Civil
Jincheng Yang, Reza Haghani, Mohammad Al-Emrani
MAINTENANCE, SAFETY, RISK, MANAGEMENT AND LIFE-CYCLE PERFORMANCE OF BRIDGES
(2018)
Article
Engineering, Multidisciplinary
Mohsen Heshmati, Reza Haghani, Mohammad Al-Emrani
COMPOSITES PART B-ENGINEERING
(2017)
Article
Engineering, Multidisciplinary
Mohsen Heshmati, Reza Haghani, Mohammad Ai-Emrani
COMPOSITES PART B-ENGINEERING
(2017)
Article
Engineering, Mechanical
Zhuang Sun, Yixin Zhao, Yirui Gao, Sen Gao, Davide Elmo, Xindong Wei
Summary: In this study, the modified semi-circular bending test was used to investigate the fracture toughness of coal samples with different sizes and bedding angles. The results showed that the fracture toughness of coal exhibits size effect and anisotropy. The crack initiation and propagation in hydraulic fracturing of coal seam can be influenced by bedding angles.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Ruiming Zhang, Kai Ma, Wenzhu Peng, Jinyang Zheng
Summary: The fatigue crack growth rates of 4130X steel in different hydrogen concentrations were measured, and the influence of hydrogen on crack behavior was analyzed. Results show that the crack growth rate increases with increasing hydrogen pressure, reaching a threshold at 87.5 MPa.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Hien Do, Phuc L. H. Ho, Canh V. Le, H. Nguyen-Xuan
Summary: In this study, a new method for determining the limit loads of fracture structures using the pseudo-lower bound method with adaptive quadtree meshes is proposed. The method overcomes the volumetric locking problem and handles the challenge of hanging nodes during refinement procedure by using quadtree meshes. The effectiveness of the approach is demonstrated through numerical validation.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Weimin Song, Yuxin Fan, Hao Wu, Liang Zhou
Summary: This study proposed a novel test method to characterize the I-II mixed fracture toughness of asphalt pavement and investigated the effects of reclaimed asphalt pavement (RAP) and loading rate. The results showed that loading rate and inclusion of RAP had positive effects on fracture toughness.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Zida Liu, Diyuan Li, Jianqiang Xia, Quanqi Zhu
Summary: In this study, the influence of flaw inclinations on the failure mechanism of fissured granite specimens was analyzed through a series of experiments. A quantitative method combining deep learning and scanning electron microscope was employed to identify the mesoscopic fracture mechanism of macroscopic cracks. The results indicated that the failure of fissured specimens was mainly caused by tensile stress and shear stress.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Jiabing Zhang, Yiling Chen, Ronghuan Du, Xianglian Zhao, Jun Wu
Summary: This study investigated the mechanical characteristics and crack propagation behavior of sandstone-like samples with single cracks under freeze-thaw cycles. The results demonstrated the significant effects of crack angle and freeze-thaw cycles on the compressive strength and stability of the samples. Confining pressure inhibited the freeze-thaw deterioration, and the acoustic emission signals exhibited good consistency with the stress-strain curves. The simulation results matched well with the experimental results, and five crack propagation modes were proposed.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Felix Boedeker, Pauline Herr, Anders Biel, Ramin Moshfegh, Stephan Marzi
Summary: Cohesive Zone Models with finite thickness are widely used for fracture mechanical modeling. Computational homogenization techniques are crucial for the development of advanced engineering materials. FFT-based homogenization scheme shows potential in reducing computational effort and has practical applications.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Sobhan Pattajoshi, Sonalisa Ray, Yugal Kishor Joshi
Summary: In this work, a novel multi-layer composite structure is proposed for protective shelter design. The dynamic behavior and mechanical performance of the multi-layer composite under projectile impact loading are investigated. The proposed composite target demonstrates enhanced penetration resistance and lesser damage compared to its reinforced concrete monolayer counterpart. An analytical model is also developed to predict the forces transmitted to the lowest layer for design purposes.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
H. M. Shodja, M. T. Kamali, B. Shokrolahi-Zadeh
Summary: This study proposes a semi-analytical method for calculating the stress intensity factor of an internally pressurized eccentric annular crack. By using hypersingular integral equations and conformal mapping, accurate values of SIFs along the crack edges can be obtained. The material properties of the elastic matrix do not affect the SIF values, as demonstrated through the investigation of geometric parameters.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Wen Hua, Zhanyuan Zhu, Wenyu Zhang, Jianxiong Li, Jiuzhou Huang, Shiming Dong
Summary: Accurate assessment and prediction of fracture behavior in cracked materials using mixed mode fracture criteria are crucial in fracture mechanics. This study comprehensively reviewed modified fracture criteria that incorporate T-stress for mixed mode I-II cracks. A comparative analysis was conducted between experimental results and theoretical predictions for five different cracked configurations. The study also discussed the effect of T-stress on crack initiation angle and fracture toughness, providing suggestions. The results showed variations in predictive accuracy across different cracked configurations due to disparities in T-stress. However, similar predictions were observed for semi-circular bend and edge-crack triangular specimens due to their similar biaxial stress ratio B. Different fracture criteria were suitable for different cracked configurations with positive or negative T-stresses.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Qing-qing Shen, Qiu-hua Rao, Wei Yi, Dian-yi Huang
Summary: This study proposes a theoretical approach to forecast multi-crack propagation trajectories in a finite plate. By calculating the stress intensity factor (SIF) and analyzing the influence of crack size, the criteria for crack initiation and propagation in a finite plate are established. Experimental results demonstrate that the SIF of multiple cracks in a finite plate is consistently larger than that of an infinite plate.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Songbai Li, Qiyun Zhu, Zhizhong Lu, Hongzhi Yan, Chu Zhu, Peize Li
Summary: This study investigates the effects of laser heating and laser shot peening on fatigue life of AA2524, and predicts the fatigue life using artificial neural networks and support vector regression models. The results show that laser heating and laser shot peening can significantly improve the fatigue life, and the neural networks have better prediction ability.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
V. Shlyannikov, A. Sulamanidze, D. Kosov
Summary: This paper presents experimental crack-growth data for thermomechanical fatigue conditions in nickel-based alloy components. The crack-growth experimental results are interpreted using finite element analyses and multi-physics numerical calculations. The results show that crack growth rate is slower under isothermal pure fatigue conditions, while it is faster under thermomechanical cyclic deformation conditions.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Tairui Zhang, Xin Ma, Bin Yang, Wenchun Jiang, Zhiqiang Ge, Xiaochao Liu
Summary: This study experimentally investigated the fracture toughness distributions in dissimilar metal welds. The predictions of fracture toughness were made using three criteria and an energy release rate model. The results showed that using the critical strain criterion and ERR model resulted in higher consistency compared to mini-CTs, while the predictions using the critical stress criterion had high dispersion. The study also investigated the source of errors through damage developments and SEM observations.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Yike Dang, Zheng Yang, Xiaoyu Liu, Jianghao Guo
Summary: This study uses discrete element modeling to examine bedded rock failure with parallel defects. It is found that bedding influences crack propagation direction but has limited impact on final failure. Shear failure accumulates at the bridge area and defect tip, while tensile failure occurs during nucleation region development.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
