Article
Mechanics
H. Girard, A. Doitrand, B. Koohbor, R. G. Rinaldi, N. Godin, D. Long, J. Bikard, L. Trouillet-Fonti
Summary: Fiber-matrix interface debonding was investigated in single-fiber epoxy-glass fiber specimens subjected to transverse tensile loading. Experimental observations showed sudden debonding initiation between 67 and 83 deg., followed by stable debonding propagation. A coupled criterion (CC) accurately predicted the abrupt debonding initiation, considering stress and energy aspects. This method allowed for obtaining a range of interface shear and opening critical energy release rates (ERR) and strengths. The loading required for initiation depended on the opening (mode I) critical ERR and tensile and shear strengths. The debonding arrest angle also depended on the shear (mode II) critical ERR. Thus, a three-step methodology was described to determine the interface properties and an optimum set of parameters using Linear Elastic Fracture Mechanics.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
A. Bergara, J. Dorado, A. Martin-Meizose, J. M. Martinez-Esnaola
Summary: This work presents the numerical modeling and validation of two different fatigue propagation tests that attempt to simulate crack growth in aeronautic engine vane guides. The experimental and numerical results show good correlation regarding crack shape and number of cycles until failure, validating the capabilities of the XFEM-based LEFM approach in simulating fatigue crack growth in complex crack fronts.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2021)
Article
Engineering, Biomedical
Brian FitzGibbon, Patrick McGarry
Summary: The study introduces a bespoke experimental technique to generate and characterise mode II crack initiation and propagation in arterial tissue. The developed method, shear fracture ring test (SFRT), effectively produces pure mode II fracture in arteries, with significantly higher fracture strength compared to mode I. The findings have important implications for understanding the biomechanical conditions underlying aortic dissection.
ACTA BIOMATERIALIA
(2021)
Article
Engineering, Mechanical
Zehao Fan, Shi-Qing Wang
Summary: Based on spatial-temporal resolved measurements of the stress field at crack tip using polarized optical microscopy (str-POM), we develop an stress analysis approach to elastomeric fracture. Specifically, str-POM measurements reveal emerging phenomenology in three distinct ways. First, there emerges a stress saturation zone (SSZ) whose dimension rss is independent of the stress intensity factor K.
EXTREME MECHANICS LETTERS
(2023)
Article
Engineering, Mechanical
Wung Jae Wang, Man-Sung Yim
Summary: The objective of this study was to propose a crack growth prediction model for cracked specimens under large and variable amplitude loading conditions. The model was generated by applying the concept of change in net-section strain energy to simulate elastic-plastic fracture behavior, and performing three-dimensional fitting with respect to changes in the net-section strain energy, load ratio, and crack growth rate. The validity of the model was examined through comparisons with experimental data and simulation results from existing crack growth models.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Chemistry, Physical
Shi Song, Moritz Braun, Bjarne Wiegard, Hauke Herrnring, Soeren Ehlers
Summary: H-adaptivity is an effective tool for introducing local mesh refinement in FEM-based numerical simulations of crack propagation. The h-adaptive element splitting method combines h-adaptivity with element splitting to accurately simulate cracks in large structures and reduce computational resources.
Article
Engineering, Multidisciplinary
Zhijun Liu, Yao Jiang, Han Yang, Zhen Cai, Yuxin Tong, Fanyu Zhang
Summary: Fractures have long been a subject of interest for computational scientists, leading to the development of enriched finite element methods like the numerical manifold method. However, ill-conditioning has plagued these methods when applied to linear elastic fracture problems. In this study, a preconditioner based on global normalization and local Gram-Schmidt orthogonalization is employed to eliminate ill-conditioning issues in the numerical manifold method. Numerical examples show that this preconditioning strategy is highly effective in reducing the condition number and iteration counts of an iterative solver, making it a robust, stable, and efficient tool for analyzing linear elastic fractures.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Chemistry, Physical
Yousef Navidtehrani, Covadonga Betegon, Emilio Martinez-Paneda
Summary: This study presents a simple and robust implementation of the phase field fracture method in Abaqus, utilizing only the UMAT subroutine and showing potential and robustness in addressing various fracture scenarios. The new implementation is capable of reproducing numerical and experimental results, capturing complex crack trajectories, and solving contact problems efficiently, with the developed code freely available for use.
Article
Engineering, Mechanical
Huiling Ci, Bing Bai, Yan Zou, Hongwu Lei, Yinxiang Cui
Summary: A novel direct numerical modeling method based on the integral-generalized finite difference (IGFD) method is developed for preexisting cracks and their propagation. The IGFD method shows excellent accuracy, flexibility, and convenience in dealing with boundary conditions. Special treatments like paired nodes and birth-death algorithms are employed to track crack growth path, constituting the extended IGFD (xIGFD) method for discontinuity problems. The proposed xIGFD method has been successfully applied and compared with existing numerical methods, demonstrating its effectiveness and superiority.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Engineering, Multidisciplinary
Jian Zhang, Fred van Keulen, Alejandro M. Aragon
Summary: The study proposes a fully immersed topology optimization procedure for designing structures with tailored fracture resistance in brittle materials under linear elastic fracture mechanics assumptions. By using a level set function and the Interface-enriched Generalized Finite Element Method (IGFEM), accurate structural responses are obtained. The technique approximates energy release rates (ERRs) of all potential cracks using topological derivatives after a single enriched finite element analysis, and demonstrates the ability to tailor fracture resistance through several numerical examples.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Mechanics
Zheng Liu, Xin Wang, Zhe Zhang, Pengfei Jin, Xu Chen
Summary: This study investigated the constraint parameters of clamped SENT specimens through 3D finite element analyses, finding significant effects of crack depth, specimen thickness, loading level, and strain hardening index on the 3D constraint parameters with a coupling effect. The influence of crack depth and specimen geometry on constraint levels decreased with increasing hardening exponent.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Manufacturing
E. Polyzos, A. Katalagarianakis, D. Van Hemelrijck, L. Pyl
Summary: This article analyzes delamination tests of nylon 3D-printed specimens reinforced with carbon fibers by employing various analytical methods and numerical models. The results are well in agreement with experimental data, supporting the use of stochastic techniques in combination with linear fracture mechanics for the delamination analysis of 3D-printed composites.
ADDITIVE MANUFACTURING
(2021)
Article
Mechanics
Chih-Hsuan Lee, Hsoung-Wei Chou
Summary: The presence of nozzles in reactor pressure vessels can significantly affect their structural integrity. This study presents an analysis of the stress intensity factors of Taiwan domestic RPV nozzles using finite element models and fracture mechanics. The results obtained using the ASME method and finite element analysis are compared, showing that the ASME method produces conservative values for circular corner cracks but underestimates the elliptical corner cracks.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Chemistry, Physical
Abdulnaser M. Alshoaibi, Abdullateef H. Bashiri
Summary: This paper developed an efficient two-dimensional fatigue crack growth simulation program for linear elastic materials using incremental crack growth process and adaptive finite element technique. The research results demonstrated the performance and capability of the developed program in application examples.
Article
Engineering, Chemical
Till Vallee, Marvin Kaufmann, Robert D. Adams, Matthias Albiez, Joao R. Correia, Thomas Tannert
Summary: Dimensioning adhesively bonded joints is difficult due to their diverse geometry and material, stress peaks, scatter, and brittleness. Direct stress based methods are unsuitable, while fracture mechanics are not widely accepted by practitioners. Probabilistic methods, closer to classical mechanics, may provide an alternative. This paper presents the implementation of these methods and provides examples of adhesively bonded joints with different typologies and materials.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2023)
Article
Mechanics
T. Chocron, L. Banks-Sills
PHYSICAL MESOMECHANICS
(2019)
Article
Materials Science, Multidisciplinary
Leslie Banks-Sills, Ido Simon, Tomer Chocron
INTERNATIONAL JOURNAL OF FRACTURE
(2019)
Article
Mechanics
Mor Mega, Orly Dolev, Leslie Banks-Sills
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2020)
Correction
Materials Science, Multidisciplinary
Leslie Banks-Sills, Ido Simon, Tomer Chocron
INTERNATIONAL JOURNAL OF FRACTURE
(2020)
Article
Mechanics
Leslie Banks-Sills
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2020)
Article
Engineering, Mechanical
Mor Mega, Leslie Banks-Sills
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2019)
Article
Mechanics
Elad Farkash, Leslie Banks-Sills
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2020)
Article
Engineering, Mechanical
Elad Farkash, Leslie Banks-Sills
Summary: The authors introduce a new approach using coupled and dual energy release rates to determine stress intensity factors of interface cracks, leading to a more suitable equation for calculating mode mixity or phase angle. Geometrical interpretation between energy release rates is found for both homogeneous and interface crack problems.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Leslie Banks-Sills, Ido Simon
Summary: The double cantilever beam specimen is commonly used to measure the mode I fracture toughness of laminate composites, with standards available for testing unidirectional materials and extensively used for multi-directional laminates. Expressions for calculating the energy release rate in different situations such as symmetric arm heights and varying moduli have been presented, showing good agreement in results. This study aims to compare these expressions to finite element analyses and demonstrates the potential for using simple formulas instead of complex finite element analyses by considering different specimen arm heights and stiffnesses.
INTERNATIONAL JOURNAL OF FRACTURE
(2021)
Article
Materials Science, Multidisciplinary
Leslie Banks-Sills, Orly Dolev
Summary: The purpose of this investigation is to evaluate the accuracy of global expressions of the energy release rates for laminate composite beam specimens. The results show that considering specimen arm heights, stiffnesses, and delamination length correction can lead to the best results in estimating the energy release rate for different types of beam specimens.
INTERNATIONAL JOURNAL OF FRACTURE
(2022)
Article
Engineering, Mechanical
Subramanyam Redd Matli, Leslie Banks-Sills
Summary: In this study, the energy release rates of structures undergoing large deformations were analyzed using the virtual crack closure technique (VCCT). Nonlinear finite element analyses were performed on edge notched and pure shear specimens. The relationship between nodal point forces and displacements was examined to determine the energy release rates and mode mixity. The results obtained from VCCT were compared to J-integral.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Mor Mega, Orly Dolev, Leslie Banks-Sills
Summary: In this study, nearly mode II initiation and resistance energy release rate values were determined for two multi-directional carbon fiber reinforced polymer (CFRP) material systems. Finite element analyses were conducted to calculate stress intensity factors and fracture toughness resistance curves. The results showed that the initiation energy release rate values were higher for the prepreg material compared to the wet-layup material.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Mechanics
Ofir Shor, Leslie Banks-Sills, Ido Simon
Summary: In Part I of this paper, quasi-static fracture toughness tests were conducted on two carbon fiber reinforced polymer materials. Part II focuses on the micro-computerized tomography analysis of the materials' micromechanical structure and its relationship with the observed experimental behavior. The failure mechanisms of the double cantilever beam and end-notched flexure specimens were further studied through cohesive zone model simulations and the finite element method.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Mechanics
Leslie Banks-Sills, Ofir Shor, Ido Simon, Tomer Chocron, Victor Fourman
Summary: In Part I of this study, fracture toughness tests were conducted on two laminate composites in modes I, II and mixed modes I/II. Both composites consisted of carbon fibers in an epoxy matrix. The tests used ASTM and ISO standards and included double cantilever beam, end-notched flexure, and mixed mode bending specimens. Part II of the study reported micro-computerized tomography on some of the specimens, linking the experimental behavior to the micromechanical structure of the materials. Numerical simulations using a cohesive zone model and finite element method were performed to gain better understanding of the observed failure behavior.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Leslie Banks-Sills, Orly Dolev
INTERNATIONAL JOURNAL OF FRACTURE
(2020)
