Article
Mechanics
V Shlyannikov, E. Martinez-Paneda, A. Tumanov, A. Tartygasheva
Summary: This study investigates the crack tip mechanics of strain gradient plasticity solids using analytical and numerical methods. A first-order mechanism-based strain gradient plasticity theory is adopted, and the effects of strain gradient on crack tip stresses are quantified. The study also formulates novel amplitude factors for strain gradient plasticity and proposes a generalized J-integral to characterize nonlinear amplitude factors. The research expands the understanding of strain gradient plasticity and its application for fracture and damage assessment.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Yuhei Ogawa, Keiichiro Iwata, Saburo Okazaki, Masami Nakamura, Kazuki Matsubara, Osamu Takakuwa, Hisao Matsunaga
Summary: Hydrogen affects crack-tip plastic-zone development by sharpening the crack tip shape, suppressing the extension of severely-deformed zone, and enhancing crack-tip branching, leading to a slower crack growth rate. However, it barely alters the overall plastic-zone size between in-air and hydrogen-gas conditions.
Article
Engineering, Multidisciplinary
Ying Wang, Zheng Yan, Zhen Wang
Summary: This paper introduces an elastoplastic constitutive model based on the Chaboche kinematic hardening model and uses the extended finite element method to study the influence of material elastoplasticity and crack tip plastic zone on fatigue crack propagation in orthotropic steel bridge decks. The study found the propagation path and rate of fatigue cracks in OSBD, highlighting the significance of considering plastic deformation in crack propagation analysis.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2021)
Article
Mechanics
Tito Andriollo, Varvara Kouznetsova
Summary: The study reveals that the applicability of Irwin's estimate in metals with particles is questionable when the plastic zone size is comparable to the particle spacing. A new compact formula for plastic zone size is proposed in this scenario where the PZ shape differs from von Mises plasticity expectation.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
Shuo Liu, Guodong Fang, Maoqing Fu, Xiangqiao Yan, Songhe Meng, Jun Liang
Summary: An element-based peridynamics (EBPD) and finite element method (FEM) coupling model is proposed for solving elastic-plastic deformation and failure problems, with the use of non-local stress and strain concepts to describe material properties and improve computational efficiency.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Xingxing Wang, Xuecheng Ping, Congman Wang, Hongxia Zheng
Summary: This paper proposes a novel crack-tip singular element to replace the enriched element in the traditional XFEM, based on the numerical eigensolution of the singular displacement and stress field together with the H-R variational principle. The element is applicable for analyzing various forms of cracks and can be used in anisotropic materials, interface cracks, and cracks terminating at the bimaterial interface. The numerical solutions of the singular stress field in different crack forms are presented through numerical examples, demonstrating the effectiveness and versatility of the novel crack-tip singular element.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Engineering, Mechanical
Bing Yang, Zhanjiang Wei, Zhen Liao, Shuwei Zhou, Shoune Xiao, Tao Zhu, Guangwu Yang, Mingmeng Wang
Summary: In this paper, a digital image correlation method for studying fatigue crack growth rate is proposed, which improves the accuracy of stress intensity factor calculation by solving the crack tip position. Results show significant differences in crack tip coordinates, stress intensity factors, and plastic zone contours between loading and unloading phases.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2021)
Article
Engineering, Mechanical
D. Camas, R. Branco, F. V. Antunes, D. M. Neto
Summary: This work numerically studied the shape and dimension variations of CT specimens with straight cracks and different thickness values under different load levels. It explored the impact of variables such as load magnitude, thickness of the specimen, and position along the crack front. The study found a complex plastic zone along the crack front, with the maximum area positioned at some distance from the crack front. The study also examined the correlation between the size of the monotonic plastic zone and the plastic CTOD to determine if a well-defined relationship exists. The findings suggest that utilizing the plastic CTOD parameter may not be appropriate for fatigue crack growth studies.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Chemistry, Physical
Jesus Toribio, Beatriz Gonzalez, Juan-Carlos Matos
Summary: This article explores the influence of crack path branching on plasticity-induced fatigue crack growth, finding a retardation effect in growth rate in different cases. It shows that the growth rate depends on factors such as branch length, initial projected length, branch angle, fatigue intensity, and distance between bifurcated crack tips.
Article
Multidisciplinary Sciences
David Melching, Tobias Strohmann, Guillermo Requena, Eric Breitbarth
Summary: This paper presents a data-driven and deep learning-based model for crack tip detection in fatigue crack growth experiments. Through interpretability methods, the authors demonstrate the superior performance of this model, particularly in focusing on the crack tip region.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
S. S. Hirmukhe, K. E. Prasad, I. Singh
Summary: Cellular metallic glasses exhibit attractive properties for structural and functional applications, with deformation mode transitioning from global failure to local failure and eventually to collective buckling as relative density decreases. Atomistic simulations show a shift in deformation behavior from localized to homogeneous with increasing cell size. The interaction stress associated with flow defects plays a key role in the deformation response of cellular metallic glasses.
MECHANICS OF MATERIALS
(2021)
Article
Engineering, Mechanical
Simon Lubich, Carl Fischer, Simon Schilli, Thomas Seifert
Summary: In this paper, the effect of the polycrystalline microstructure on crack-tip opening displacement and crack closure is investigated. It is found that the crack opening stress and cyclic crack-tip opening displacement are significantly influenced by the local grain structure, and the differences in the cyclic crack opening displacement are attributed to the asymmetric plastic strain fields in the plastic wake behind the crack-tip of the microstructure-based model.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Mechanics
Xingling Huang
Summary: A new analytical solution for plastic zone size is proposed for mixed mode I/II cracks using the von Mises yield criterion, and the theoretical relationship between plastic zone size and in-plane and out-of-plane T-stresses is determined. Three constraint parameters are derived from plastic zone sizes and area, and the influences of T-stresses and mode mixity on plastic zones are investigated. The combined effects of in-plane and out-of-plane T-stresses on fracture toughness are analyzed, and linear correlations between constraint parameters and fracture toughness are observed.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Jesus Toribio, Juan-Carlos Matos, Beatriz Gonzalez
Summary: This article investigates the retardation effect in plasticity-induced fatigue crack growth rate for low-medium strength steel, finding that the retardation effect increases with an increase in the initial kinked crack tip angle and length, as well as with a decrease in the stress intensity factor (SIF) range.
Article
Engineering, Mechanical
Xiaofei Hu, Weihua Chen, Peng Zhang, Weian Yao
Summary: This paper proposes a crack-tip element to accurately capture the dynamic response of three-dimensional cracks, which works perfectly with an explicit precise integration method to provide high accuracy and efficiency in modeling dynamic 3D cracks.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Engineering, Multidisciplinary
Mohamed Jebahi, Frederic Dau, Ivan Iordanoff, Jean-Pierre Guin
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2017)
Article
Chemistry, Physical
Richard Renou, Laurent Soulard, Emilien Lescoute, Corentin Dereure, Didier Loison, Jean-Pierre Guin
JOURNAL OF PHYSICAL CHEMISTRY C
(2017)
Article
Materials Science, Ceramics
Sheldon M. Wiederhorn, Gabriele Rizzi, Susanne Wagner, Guenter Schell, Michael J. Hoffmann, Theo Fett
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2018)
Article
Materials Science, Ceramics
Astrid Bakken, Susanne Wagner, Michael J. Hoffmann, Bernt Thorstensen, Mari-Ann Einarsrud, Tor Grande
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2018)
Article
Energy & Fuels
Tobias Leonhard, Alexander D. Schulz, Holger Roehm, Susanne Wagner, Fabian J. Altermann, Wolfgang Rheinheimer, Michael J. Hoffmann, Alexander Colsmann
Article
Chemistry, Multidisciplinary
Holger Rohm, Tobias Leonhard, Alexander D. Schulz, Susanne Wagner, Michael J. Hoffmann, Alexander Colsmann
ADVANCED MATERIALS
(2019)
Article
Materials Science, Ceramics
C. Dereure, R. Hall, F. Baber, D. Loison, E. Lescoute, J. -P. Guin, J. -C. Sangleboeuf, L. Berthe, M. Nivard, I. Guven
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2019)
Article
Materials Science, Ceramics
G. Trenvouez, J-P. Guin, V. Keryvin, C. Bernard
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2020)
Article
Chemistry, Physical
Ellyn A. King, Sabyasachi Sen, Wataru Takeda, Catherine Boussard-Pledel, Bruno Bureau, Jean-Pierre Guin, Pierre Lucas
Summary: Germanium selenide glasses aged for up to 20 years at room temperature exhibit structural relaxation as observed through Raman spectroscopy, with changes in the ratio of tetrahedral units and configurational entropy. The non-reversing enthalpy obtained by MDSC is not a reliable measure of the ability of a glass to relax.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Tilo Zienert, Dirk Endler, Jana Hubalkova, Goekhan Guenay, Anja Weidner, Horst Biermann, Bastian Kraft, Susanne Wagner, Christos Georgios Aneziris
Summary: Niobium-alumina aggregate fractions with particle sizes up to 3150 μm were produced through crushing pre-synthesised fine-grained composites. XRD analysis revealed phase separation with niobium enrichment in the aggregate class 45-500 μm. The absence of organic additives in the castable mixtures led to high water demands and open porosities in the fine- and coarse-grained composites.
Article
Materials Science, Multidisciplinary
Bastian Kraft, Susanne Wagner, Karl G. Schell, Michael J. Hoffmann
Summary: The electrical conductivity of Nb-Al2O3 composite materials prepared using the Field-assisted sintering technique (FAST) was investigated. The study found that the percolation threshold is influenced by the particle size of the starting powders and the volume contents of the refractory metal. The microstructure was also found to affect the resulting material properties at the macroscopic scale.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Tilo Zienert, Dirk Endler, Jana Hubalkova, Patrick Gehre, Michael Eusterholz, Torben Boll, Martin Heilmaier, Goekhan Guenay, Anja Weidner, Horst Biermann, Bastian Kraft, Susanne Wagner, Christos G. Aneziris
Summary: Niobium-alumina composite aggregates with 60 vol% metal content were produced using castable technology followed by sintering and a crushing and sieving process. Phase separation between niobium and corundum was observed during the crushing process. The synthesized aggregates were then used to produce coarse-grained refractory composites with good performance.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Ceramics
P. Hettich, K. G. Schell, E. C. Bucharsky, G. Rizzi, S. Wagner, T. Fett
Summary: Cracks at free surfaces are influenced by local stresses. Residual compression slows down the crack, while residual tensile stresses cause it to advance. This effect can be used to estimate residual surface stresses in silica. The experiment revealed clear indications of compressive stresses in the water diffusion zone.
GLASS PHYSICS AND CHEMISTRY
(2022)
Proceedings Paper
Physics, Condensed Matter
D. Loison, J. -P. Guin, J. -C. Sangleboeuf, M. Nivard, E. Lescoute, A. Sollier, G. Seisson, D. Hebert, L. Berthe, M. Boustie
SHOCK COMPRESSION OF CONDENSED MATTER - 2015
(2017)
Article
Materials Science, Multidisciplinary
V. Keryvin, L. Charleux, R. Hin, J. -P. Guin, J. -C. Sangleboeuf