Article
Materials Science, Multidisciplinary
Miguel Ruiz de Sotto, Veronique Doquet, Patrice Longere, Jessica Papasidero
Summary: In this study, an extensive experimental campaign and numerical simulations were conducted to investigate the ductile fracture behavior of Ti-6Al-4V titanium alloy. The results showed that ductility of the material exhibited anisotropic characteristics depending on the stress state and strain rate, with different behavior observed in tension and compression. The fracture strain was found to decrease with increasing absolute value of the triaxiality, reaching a maximum close to zero, while no clear correlation with the Lode parameter was identified.
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2022)
Article
Chemistry, Physical
Felix Rickhey, Seokmoo Hong
Summary: This study investigates the crucial parameter of stress triaxiality (eta) in ductile damage prediction, particularly for anisotropic materials. It presents an alternative method to obtain eta directly from strains, and validates different yield criteria for predicting triaxiality. The findings have significant implications for damage prediction and design in materials.
Article
Materials Science, Multidisciplinary
Nathan Spulak, Jeremy Seidt, Amos Gilat
Summary: The ductile fracture behavior of 2024 aluminum under unequal in-plane biaxial tension and out-of-plane compression is studied using a novel experimental design and numerical simulations. Fracture is observed directly during loading in unbacked specimens and using interrupted testing and acoustic emissions in tests with a backing plate. The plasticity model used in the simulations is validated by matching the simulated response with experimental data, and the equivalent plastic fracture strain is determined for various stress states.
MECHANICS OF MATERIALS
(2023)
Article
Mechanics
Xiaofan Liu, Shen Yan, Kim J. R. Rasmussen, Gregory G. Deierlein
Summary: This paper discusses the effect of the Lode angle on the fracture strain of steels and proposes a new fracture model, LMVGM, which combines the effects of stress triaxiality and the Lode angle parameter for accurate prediction of fracture strain.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Lirong Sun, Zhongyi Cai, Jiaxin Gao, Mingwei Wang, Li Li
Summary: This paper focuses on accurately predicting fracture strain and FFLC by calibrating material constants using specimens of reasonable shapes and sizes. Different material constants have a significant impact on the magnitude and shape of fracture strain and FFLC.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Vladimir V. Skripnyak, Vladimir A. Skripnyak
Summary: By conducting tensile tests and Digital Image Correlation analysis, the mechanical behavior of the Ti-6Al-4V alloy at different strain rates was studied. It was found that at high strain rates, the alloy exhibited localized shear bands and the ultimate strain to fracture in the strain localization zone tended to increase with the strain rate, while showing a tendency towards embrittlement at high stress triaxialities.
Article
Mechanics
Yanshan Lou, Pengfei Wu, Chong Zhang, Jizhen Wang, Xvyang Li, Rugang Chai, Jeong Whan Yoon
Summary: A stress-based shear ductile fracture criterion (sDF2016) is introduced to improve the prediction accuracy of failure for lightweight metals. The criterion takes into account the stress state effect on fracture and is less sensitive to strain path changing effect. Experimental verification and modeling results show that the sDF2016 criterion can accurately predict fracture initiation under distinct stress states.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Yonghyun Cho, Changkye Lee, Jurng-Jae Yee, Dong-Keon Kim
Summary: This paper presents experimental and finite element techniques to predict ductile fracture in mild carbon structural steel, calibrating fracture model parameters successfully and performing fracture simulation and validation.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Multidisciplinary
Peng-ru Li, Qun-bo Fan, Xin-jie Zhu, Hai-chao Gong
Summary: The study successfully simulated the mechanism of conoidal fracture damage caused by a high-speed fragment-simulating projectile impacting a composite armor plate. Three main damage zones were identified, each with different damage mechanisms and formation processes.
DEFENCE TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Gauri Mahalle, Nitin Kotkunde, Amit Kumar Gupta, Swadesh Kumar Singh
Summary: This study emphasizes the importance of accurately predicting the fracture limits of high strength superalloys during sheet-metal stretch forming processes. Experimental results show that the forming and fractured limits of IN718 alloy are significantly influenced by variations in processing temperatures, with higher fracture limits observed in the entire deformation region. Seven different ductile fracture models are formulated to predict the fracture loci of IN718 in EPS vs. triaxiality space, with the Oh model showing the best predictability and least average absolute error at all temperatures.
INTERNATIONAL JOURNAL OF MATERIAL FORMING
(2021)
Article
Engineering, Multidisciplinary
Sina Abrari Vajari, Matthias Neuner, Prajwal Kammardi Arunachala, Andy Ziccarelli, Gregory Deierlein, Christian Linder
Summary: Phase field models for ductile fracture have been widely studied, but most existing methods only consider the effects of plastic deformation and neglect the multi-axial stress states in practical designs. In this work, a thermodynamically consistent phase field method coupled with finite strain plasticity is proposed to address this issue. The Stress-Weighted Ductile Fracture Model (SWDFM) is utilized to capture the coupling between plasticity and stress states. The excellent performance of the SWDFM in predicting ductile crack initiation motivates its incorporation into the phase field approach for predicting crack initiation and propagation.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Engineering, Manufacturing
Anees Jaleel, C. Sathiya Narayanan
Summary: Incremental sheet forming (ISF) is a progressive and flexible method used for producing sheet metallic components in limited quantities. It has advantages such as higher formability, no need for complex molds, good surface finish, and quick design changes. However, it also has disadvantages including low accuracy and slow process speed. This paper investigates the impact of hole size and other input parameters on sheet formability, correlating it with factors such as crystallite size and dislocation density. Experimental results are compared with simulation results, and numerical and experimental comparisons are made between contour and spiral tool paths.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Mechanics
A. R. Torabi, H. Sadeghian, M. R. Ayatollahi
Summary: This research investigated the load carrying capacity (LCC) of O-notched diagonally loaded square plate (DLSP) samples with pre-existing cracks under mixed mode I/II loading both theoretically and experimentally. The experimental observations showed significant plastic deformations in the specimens at the onset of crack propagation. The theoretical prediction utilized the Fictitious Material Concept (FMC) and coupled it with stress based brittle fracture criteria to estimate the LCCs of the cracked DLSP samples successfully.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Nuclear Science & Technology
Jun-Min Seo, Hune-Tae Kim, Yun-Jae Kim, Hiroyuki Yamada, Tomohisa Kumagai, Hayato Tokunaga, Naoki Miura
Summary: In this paper, the effect of stress triaxiality and strain rate on fracture strain of austenitic stainless steel 304 was investigated through smooth and notched bar tensile tests. Test data revealed a decrease in true fracture strain with increasing stress triaxiality and strain rate. The Johnson-Cook (J-C) fracture strain model was employed to quantify the test data, providing a conservative prediction of true fracture strain with a difference of less than 20%. The conservatism in the strain-based acceptance criteria in ASME B&PV Code, Section III, Appendix FF was also discussed.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
H. Paul, R. Chulist, L. Litynska-Dobrzynska, M. Prazmowski, M. Faryna, I. Mania, Z. Szulc, M. M. Miszczyk, A. Kurek
Summary: This paper presents a comprehensive study of the microstructure-property relationships in Ta and stainless or carbon steel composites fabricated by explosive welding using Cu interlayer. The study reveals complex microstructures in interfacial layers, phase transformation mechanisms in reaction regions, and competition between strain-hardening and softening processes in parent sheets. The micro hardness values of the welded sheets increased as the joining interface approached, except for the layers directly adhering to large reaction regions, where a decrease in micro-hardness was observed.
MATERIALS & DESIGN
(2021)
Article
Engineering, Manufacturing
G. Yoganjaneyulu, C. Sathiya Narayanan, R. Narayanasamy
JOURNAL OF MANUFACTURING PROCESSES
(2018)
Article
Metallurgy & Metallurgical Engineering
G. Yoganjaneyulu, Y. Phaneendra, V. V. Ravikumar, C. Sathiya Narayanan
ANTI-CORROSION METHODS AND MATERIALS
(2019)
Article
Materials Science, Multidisciplinary
G. Yoganjaneyulu, K. Anand Babu, G. Venkata Siva, S. Vigneshwaran, C. Sathiya Narayanan
Article
Materials Science, Multidisciplinary
G. Yoganjaneyulu, K. Anand Babu, S. Vigneshwaran, C. Sathiya Narayanan
Article
Materials Science, Multidisciplinary
G. Sai Krishnan, L. Ganesh Babu, P. Kumaran, G. Yoganjaneyulu, Jeganmohan Sudhan Raj
MATERIALS RESEARCH EXPRESS
(2020)
Article
Engineering, Manufacturing
G. Yoganjaneyulu, C. Raju, Natarajan Manikandan, C. Sathiya Narayanan
MATERIALS AND MANUFACTURING PROCESSES
(2020)
Article
Materials Science, Textiles
Saikrishnan Ganesh, Yoganjaneyulu Gunda, Sudhan Raj Jegan Mohan, Vijay Raghunathan, Jafrey Daniel James Dhilip
Summary: This study developed four different tri-layer composites by varying the stacking sequence of areca sheath and palm leaf sheath fibers with epoxy as a matrix. The mechanical properties and water absorption of the composites were evaluated. The results showed that the composites with skin layers of areca sheath and a core layer of palm leaf sheath fibers exhibited favorable mechanical properties and reduced water absorption.
JOURNAL OF NATURAL FIBERS
(2022)
Article
Engineering, Multidisciplinary
G. Yoganjaneyulu, C. Sathiya Narayanan
JOURNAL OF FAILURE ANALYSIS AND PREVENTION
(2019)
