Article
Engineering, Mechanical
K. Sadananda, N. Iyyer
Summary: Failure diagrams are essential for evaluating the safe use of structural components under service loads and determining the need for monitoring or replacement. They help assess fatigue life or crack growth caused by fluctuating loads, providing early warning of failure. Understanding subcritical crack growth behavior and its application in components is crucial.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Geological
Robina H. C. Wong, K. T. Chau
Summary: The study investigates the effect of cyclic differential heating on subcritical crack growth (SCG) velocity in rock beams. Different responses were observed in Carrara marble and Fujian granite due to non-uniform heating, with the former experiencing a decrease in P-wave velocity and the latter showing an increase. Microcrack processing zone (PZ) was identified in front of the notch tip during creeping test.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Materials Science, Ceramics
S. Mazerat, R. Pallier
Summary: SiC-based fibers, crucial for thermostructural ceramic matrix composites reinforcement, are impacted by subcritical crack growth leading to delayed failure. Stress exponents <10 may be influenced by the continuum of silicon oxycarbide and carbon free phases, with relationships to oxygen or carbon free contents. The presence of metallic heteroelements, like Ti or Zr in fibers such as Tyranno (R), plays a critical role in this sensitivity, with discussion on two distinct groups of fiber types possibly associated to different SCG mechanisms.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Agnieszka Wojteczko, Alan Wilmanski, Zbigniew Pedzich
Summary: Subcritical crack growth is often observed in oxide ceramics, but not in non-oxide ceramics. This study demonstrates slow crack propagation in an aluminum oxynitride material and evaluates its effects on material strength.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Dalei Wang, Cheng Xiang, Yihu Ma, Airong Chen, Benjin Wang
Summary: The root-deck crack is a significant fatigue issue on OSDs, impacting bridge serviceability and being challenging to detect. Fatigue testing and microscopic examination identified lack of penetration at the weld root and high stress as key factors in crack initiation and propagation. Comparing with other fatigue test results, differences between root-deck crack and toe-deck crack failures were highlighted, providing insights for improved fatigue design of OSDs.
MATERIALS & DESIGN
(2021)
Article
Engineering, Geological
Yan Chen, Wenbing Guo, Jianping Zuo, Shuai Heng, Rong Dou
Summary: The study found that with the increase in loading rates of axial stress, the deformation, strength levels, and crack initiation stress of the sandstone specimens also increased; additionally, the initial stress and volumetric strain stress of the cracks showed a linear increasing trend with the increase in loading rates.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Mining & Mineral Processing
Songtao Ji, Zeng Wang, Jurij Karlovsek
Summary: This study introduces a computation scheme of subcritical crack growth for estimating the durability of roof strata in underground excavation, providing a method to calculate potential collapse locations, estimate roof durability, and determine initial crack sizes. Through case studies, a strong correlation between applied stress and roof durability is showcased, with the allowable tensile stress identified for a 100-year life cycle. The proposed method allows for assessing roof stability in underground excavation from both spatial and temporal perspectives.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2022)
Article
Mechanics
Diyuan Li, Jinyin Ma, Qianrong Wan, Quanqi Zhu, Zhenyu Han
Summary: Understanding the fracture behavior of hard rocks at different temperatures is crucial for the design and stability of nuclear waste disposal projects. This study found that thermal treatment at temperatures above 400 degrees Celsius led to a decrease in strength and toughness of granite due to the destruction of quartz crystal structure and generation of wider intergranular fractures. The subcritical crack growth index (n) can be used to evaluate the susceptibility of subcritical crack propagation in rock relaxation tests, aiding in the assessment of long-term stability in nuclear waste disposal projects.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
Maria Moreno-Rubio, Jesus Vazquez, Carlos Navarro, Jaime Dominguez
Summary: This study investigates the behavior of fretting fatigue and compares it with plain fatigue under different conditions, including load levels and temperatures. The results show that there are differences in fracture surfaces and fatigue crack growth rates between the two types of fatigue under different testing conditions.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Physical
Diogo M. Neto, Micael F. Borges, Edmundo R. Sergio, Fernando Antunes
Summary: This study numerically investigated the effect of thermal residual stresses (TRSs) on fatigue crack growth (FCG), revealing that compressive stresses delay FCG while tensile stresses accelerate it. The research also found that TRSs only affect FCG by changing the crack closure level.
Article
Construction & Building Technology
Jiqiang Zhang, Wei Dong, Binsheng Zhang
Summary: To investigate crack propagation in concrete, three-point bending tests were performed on beams with different sizes of pre-cracks. The tests showed that local cracks always propagated on the bottom surface and formed a through crack in the thickness direction before propagating in the height direction. The initial fracture toughness was consistent regardless of the type of crack, while the unstable fracture toughness depended on the crack geometry.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Mechanical
Chun-Jun Chen, Mei-Ni Su, Yu-Hang Wang, Rong-Hua Zhu
Summary: Hot-rolled steel sheets often exhibit anisotropy in their mechanical characteristics due to grain elongation along the rolling orientation. This anisotropy also affects fatigue crack growth behavior. However, there is limited research on this for some types of steel materials, despite their wide use in wind turbine towers. In this study, the longitudinal fatigue crack growth behavior of Q420C hot-rolled steel sheet is investigated through experiments. Results show that longitudinal cracks propagate approximately 15% faster than transverse cracks at a load ratio of 0.1 and about 22% faster at a load ratio of 0.3. The anisotropy in crack growth rates is attributed to microstructural differences. A comparison with American-made steel materials is made, and the applicability of design curves in the British Standard BS 7910, crack closure phenomenon, and fatigue crack growth mechanism are discussed.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Materials Science, Ceramics
Pamela Ricco, Nathalia de Carvalho Ramos, Tiago Moreira Bastos Campos, Viviane Oliveira Soares, Mariana de Oliveira Carlos Villas Boas, Renata Marques de Melo
Summary: This study compared the microstructure, failure probabilities, susceptibility to subcritical crack growth, and surface energy of two commercial and two experimental glass-ceramic materials. The commercial glass-ceramics were found to be more refined and uniform, leading to less strength variation. LD-C appeared to exhibit stress corrosion cracking as a result of a combination of surface energy and microstructural features.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Marine
Dong Qin, Xu Geng, Zhao Jie, Hu Yaoyu
Summary: In this paper, experimental and numerical studies were conducted to investigate the crack propagation behavior of cracked plates under low cycle fatigue loads in order to explain the mechanism of fatigue crack propagation. The experimental results show that increasing maximum applied load and decreasing stress ratio will shorten the fatigue life of the cracked plate. Meanwhile, numerical studies considered influencing factors such as stress ratio and crack length, providing a new way to study low cycle fatigue crack propagation behavior.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Aerospace
Yicheng Yang, Zhaoguo Mi, Wencan Zhang, Jiaqi Chang, Yongjun Liu, Bintao Zhong, Weihua Yang
Summary: This study investigates the effects of five rubbing modes on the initiation of radial cracks on labyrinth seal fins through a high-speed rubbing test bench. The results show that cracks are formed at the junction of the fin tip and side under all modes, and successive different rubbing modes can reduce the temperature.
Article
Engineering, Mechanical
M. Huang, M. Guibert, J. Thevenet, C. Fayolle, T. Chaussee, L. Guy, L. Vanel, J. -L. Loubet, P. Sotta
Article
Physics, Multidisciplinary
V. De Zotti, K. Rapina, P. -P. Cortet, L. Vanel, S. Santucci
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Fluids & Plasmas
Maxime Brunet, Thierry Dauxois, Pierre-Philippe Cortet
PHYSICAL REVIEW FLUIDS
(2019)
Article
Mechanics
Claudio Fusco, Didier R. Long, Loic Vanel
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2019)
Article
Physics, Multidisciplinary
S. Lherminier, R. Planet, V. Levy Dit Vehel, G. Simon, L. Vanel, K. J. Maloy, O. Ramos
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
Maxime Brunet, Basile Gallet, Pierre-Philippe Cortet
PHYSICAL REVIEW LETTERS
(2020)
Article
Physics, Multidisciplinary
Eduardo Monsalve, Maxime Brunet, Basile Gallet, Pierre-Philippe Cortet
PHYSICAL REVIEW LETTERS
(2020)
Article
Engineering, Multidisciplinary
Akash Singh, Michio Tateno, Gilles Simon, Loic Vanel, Mathieu Leocmach
Summary: The apparatus presented allows for stress or strain-controlled rheology in very soft solids, with simultaneous confocal imaging of the 3D microstructure. Stress is measured using eddy-based sensors and controlled by applying PID control loops and changing position using a micromanipulator, enabling stress measurement and control down to 6 mPa. The setup demonstrates the technical capability of independently applying shear and normal stress or strain with equal precision.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Physics, Fluids & Plasmas
Daniel Odens Mora, Eduardo Monsalve, Maxime Brunet, Thierry Dauxois, Pierre-Philippe Cortet
Summary: By theoretical analysis and numerical integration, we investigated the triadic resonance instability (TRI) of a plane inertial wave in a rotating fluid, showing that the maximum growth rate of the TRI is found for secondary waves that do not propagate in the same vertical plane as the primary wave. Experimental evidence confirms the three-dimensional nature of the TRI of a plane inertial wave, with wave vectors of secondary waves matching theoretical predictions based on the maximum growth rate criterion.
PHYSICAL REVIEW FLUIDS
(2021)
Article
Multidisciplinary Sciences
Ahmad Abdallah, Shefali Vaidya, Saly Hawila, Sophie-Laure Ornis, Gregoire Nebois, Adrien Barnet, Nathalie Guillou, Alexandra Fateeva, Adel Mesbah, Gilles Ledoux, Antoine Berut, Loic Vanel, Aude Demessence
Summary: Three new coordination polymers (CPs) made of d(10) coinage metals and methyl thiosalicylate, [M(o-SPhCO2Me)](n) (M = Cu, Ag, Au), are reported. The CPs are constructed from one-dimensional metal-sulfur networks, with Cu and Ag being three-coordinated to sulfur atoms, and Au being two-coordinated. The Cu(I) and Ag(I) CPs show orange photoemission at room temperature, while the Au(I) CP exhibits near-infrared emission at low temperatures. Furthermore, a dual luminescent flexible composite film is formed by mixing the intense orange-emissive Ag(I) CP and the blue-emissive coumarin 120 in an organic matrix, polyvinylidene fluoride (PVDF), which shows great sensitivity for temperatures up to 100 degrees C, surpassing non-lanthanide-based CPs.
Article
Physics, Fluids & Plasmas
Nicolas Lanchon, Daniel Odens Mora, Eduardo Monsalve, Pierre-Philippe Cortet
Summary: We conducted laboratory experiments in a linearly stratified fluid and found that turbulence driven by internal gravity waves can approach statistical homogeneity and axisymmetry. Nonlinearities develop through the establishment of discrete frequencies of internal wave modes when the forcing is increased. We also discovered that the most energetic modes are resonant eigenmodes of the fluid domain. By introducing slightly tilted panels, we were able to inhibit the emergence of discrete wave modes and achieve a turbulent flow with a continuum of energy in the frequency and wave-number domains.
PHYSICAL REVIEW FLUIDS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Mary-Ann Gasser, Abdenacer Ait Mani, Thierry Mourier, Alain Gueugnot, Patrick Peray, Loic Vanel, Catherine Barentin
Summary: Capillary underfill is a commonly used method in flip chip structures to fill the interconnection gap. This study focuses on understanding the wetting and adhesion mechanisms between epoxy resin and different materials in order to prevent defects and improve the mechanical strength and environmental protection of the structure.
IEEE 72ND ELECTRONIC COMPONENTS AND TECHNOLOGY CONFERENCE (ECTC 2022)
(2022)
Article
Chemistry, Physical
Aymeric Duigou-Majumdar, Pierre-Philippe Cortet, Christophe Poulard
Summary: This article presents an experimental study on the debonding criterion of fibrils of soft adhesive materials. Power laws for the maximum force and critical elongation of the fibril at debonding as a function of the diameter of the cylindrical pillar are uncovered. Viscoelastic digitation at the triple debonding line is observed during detachment for large pillar diameters.
Article
Chemistry, Physical
Tom Vincent-Dospital, Renaud Toussaint, Stephane Santucci, Loic Vanel, Daniel Bonamy, Lamine Hattali, Alain Cochard, Eirik G. Flekkoy, Knut Jorgen Maloy
