Article
Engineering, Mechanical
Jianbin Xu, Bjorn Holmedal, Odd Sture Hopperstad, Tomas Manik, Knut Marthinsen
Summary: Uniaxial tension tests were conducted on an AA5182-O sheet at different strain rates and temperatures to investigate the dynamic strain ageing. A modified constitutive model based on the mechanical threshold stress (MTS) framework was proposed and used to analyze the stress-strain response. The model successfully captured the dependence of strain rate sensitivity on strain, temperature, and strain rate, and provided a re-interpretation of the occurrence of stress serrations.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
Ruben Loland Saelen, Odd Sture Hopperstad, Arild Holm Clausen
Summary: This study investigates the mechanical response of a polymer manufactured with additive manufacturing technology and develops a corresponding constitutive model for numerical simulation. The experimental results validate the accuracy of the model and demonstrate the importance of additive manufacturing technology in engineering applications.
MECHANICS OF MATERIALS
(2023)
Article
Construction & Building Technology
Zhiqiang Fan, Fei Zhang, Bingbing Zhang, Tianming He, Peng Xu, Xuanming Cai
Summary: The study focused on the dynamic compression response and thermal properties of fly ash cenospheres polyurethane syntactic foams with hierarchical cell structure. The foam exhibited different material properties at various densities, showing potential for applications in civil engineering.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Engineering, Mechanical
P. Hao, Z. Dai, V. Laheri, F. A. Gilabert
Summary: This study proposes a constitutive model for semi-crystalline polymers called Unified SCP, which incorporates the influence of the crystalline phase on strength by modifying an existing glassy model. The model is validated through a thermo-mechanical coupled numerical framework and accurately predicts experimental results for various thermosets and thermoplastics.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Polymer Science
Jaime Orellana Barrasa, Ana Ferrandez-Montero, Begona Ferrari, Jose Ygnacio Pastor
Summary: This study analyzed the properties of polylactic acid (PLA) filaments in detail, with a focus on the impact of extrusion temperature and crosshead rate on mechanical properties. The results showed that material extruded at 190 degrees C outperformed material extruded at 180 degrees C, but both materials exhibited similar behavior after long-term natural ageing. Ageing also led to significant changes in elastic modulus and yield strength, while the flow-induced molecular orientation during extrusion played a key role.
Article
Nanoscience & Nanotechnology
M. Ciemiorek, A. Ambroziak, K. Majchrowicz, M. Lewandowska, J. Golinski
Summary: The paper discusses the formability and ductility of ultrafine grained plates of commercial 5754 aluminium alloy under different strain rates and temperatures. A hybrid process combining multi-turn Equal Channel Angular Pressing and upset forging is proposed for the simple production of UFG sheets with high formability at elevated temperatures. Proper selection of temperature and strain rate can increase the elongations in tensile tests and the formability of UFG sheets.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
S. A. Weckert, A. D. Resnyansky
Summary: This study proposes a combined experimental and computational approach to investigate the characteristics and validate models of materials such as sands and soils. Through comparing the experimental results with computational calculations, the effectiveness of the proposed model is demonstrated.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Engineering, Mechanical
Shuangmin Shi, Nelson Lam, Yiwen Cui, Guoxing Lu, Emad Gad, Lihai Zhang
Summary: Currently, there is no rational design procedure to regulate the design of building claddings or rooftops to withstand hail impact. Existing damage predictive models are not suitable for predicting hail-induced damage. Therefore, insurance premiums on damage to aluminium cladding caused by hail cannot be set fairly. In this study, an analytical model for predicting permanent indentation generated by hailstone impact is presented, which considers strain rate effects and has shown to provide predictions within a 10% difference from experimental measurements.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Hui Zhu, Hengan Ou, Atanas Popov
Summary: A new phenomenological constitutive model is proposed to predict the mechanical behavior of thermoplastics, showing favorable predictions for different phases of flow stress behavior. It demonstrates improved accuracy compared to other existing models in representing the mechanical behavior of thermoplastics under a wide range of deformation conditions.
MECHANICS OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Tangqing Cao, Qian Zhang, Liang Wang, Lu Wang, Yao Xiao, Jiahao Yao, Huaiyi Liu, Yang Ren, Jun Liang, Yunfei Xue, Xiaoyan Li
Summary: High-entropy alloys (HEAs) possess unique microstructures and chemical compositions, resulting in remarkable mechanical properties. In this study, the mechanical behaviors and deformation mechanisms of CoCrFeNi HEAs under dynamic loading were investigated through experiments and simulations. The results showed significant strain rate sensitivity and strain-hardening capability of CoCrFeNi HEAs at high strain rates. The findings shed light on the design and fabrication of HEAs with excellent dynamic mechanical properties.
Article
Materials Science, Multidisciplinary
Tao Zhang, Lan Yan, Lianjie Li, Mingshuai Huo, Hui Wu, Xuming Zha, Ningchang Wang, Xian Wu, Feng Jiang, Zhengyi Jiang, Xipeng Xu
Summary: Grain refinement has a significant impact on mechanical properties, and establishing the relationship between grain evolution and plastic behavior is essential. Through experimental research, it was found that the grain size has a significant influence on the yield stress, strain rate sensitivity, and thermal softening. Based on these findings, a new constitutive model was developed to accurately predict the mechanical behavior of the material.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Kai Yao, Xiaohua Min
Summary: This study systematically clarifies the instantaneous strain rate sensitivity (ISRS) and strain rate sensitivity of strain hardening (SRSS) in the {332} < 113 > Ti-15Mo alloy exhibiting TWIP effect. The results show that ISRS is positively correlated with the change in the dislocation activation volume, while SRSS is negatively correlated with the evolution of deformation microstructures.
Article
Polymer Science
Huanming Chen, Lewis R. Hart, Wayne Hayes, Clive R. Siviour
Summary: This paper investigates the thermal and mechanical responses of healable polyurethane materials under different strain rates, focusing on low to high strain rate behaviors. By incorporating significant characterization experiments and a modeling framework, the research demonstrates the excellent reusability of the polymer and offers a new approach for high strain rate characterization of low modulus materials.
Article
Nanoscience & Nanotechnology
Eugenio Zapata-Solvas, Bibi Malmal Moshtaghioun, Diego Gomez-Garcia, Arturo Dominguez-Rodriguez, William E. Lee
Summary: This paper examines the mechanical response of hafnium diboride at different temperatures and reveals that it exhibits metal mechanical behavior.
SCRIPTA MATERIALIA
(2021)
Article
Engineering, Mechanical
Zhaocheng Zhang, Mohammad Khan, Catalin R. Picu
Summary: In this study, a mechanism-based constitutive formulation was proposed for the plastic deformation of beta-HMX crystals. Atomistic models were used to evaluate the relation between dislocation velocity and resolved shear stress in multiple slip systems, accounting for slip asymmetry. The resulting crystal plasticity model was Reuss averaged to produce a homogenized version. The model showed good strain rate sensitivity and pressure dependence, and was able to describe strain localization.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
K. E. N'souglo, N. Jacques, J. A. Rodriguez-Martinez
Summary: This paper investigates the effect of material orthotropy on the formability of metallic sheets subjected to dynamic biaxial stretching using a three-pronged methodology. The linear stability analysis and nonlinear two-zone model show good agreement with the finite element results, providing new insights into the mechanisms controlling dynamic formability of anisotropic metallic sheets.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
Mateusz Kopec, Dominik Kukla, Xin Yuan, Wojciech Rejmer, Zbigniew L. Kowalewski, Cezary Senderowski
Summary: This paper examined the mechanical properties of MAR 247 nickel based superalloy with aluminide coating, finding that the coating significantly improved the high temperature fatigue performance of the alloy and doubled the stress amplitude response.
Article
Engineering, Multidisciplinary
M. Kopec, D. Kukla, A. Brodecki, Zl Kowalewski
Summary: The research aimed to compare the effect of 80,000 hours of high temperature exposure on the mechanical properties and microstructure of P91 steel for pipes. It was found that the prolonged exposure led to significant phase transformation and deterioration in mechanical properties, which was successfully described using fatigue damage measures. The proposed power exponent approximation method helped determine the fatigue life of P91 steel accurately.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2021)
Article
Nanoscience & Nanotechnology
Karol Frydrych, Tomasz Libura, Zbigniew Kowalewski, Michal Maj, Katarzyna Kowalczyk-Gajewska
Summary: The paper presents an experimental and numerical study on the deformation mechanisms in the AZ31B magnesium alloy sheet under cyclic in-plane tensile-compressive deformation, focusing on the influence of slip, twinning, and detwinning on mechanical response and texture evolution. A crystal plasticity model accounting for twinning and detwinning is formulated and identified using an evolutionary algorithm, with discussion on the predicted activity of deformation mechanisms in relation to experimental data.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Mateusz Kopec, Adam Brodecki, Grzegorz Szczesny, Zbigniew L. Kowalewski
Summary: This paper studied in detail the fracture behavior of four types of implants with different geometries, finding that mechanical overloads were the main cause of implant fracture. The study concluded that the current design of orthopedic implants is not sufficient to withstand the mechanical loads from the increasing weight and physical activity of patients.
Article
Mechanics
Mateusz Kopec, Stanislaw Jozwiak, Zbigniew L. Kowalewski
Summary: In this paper, an Fe-Al based composite reinforced with ultra-fine Al2O3 oxides was successfully obtained using the SHS process. The complex microstructure of the material showed excellent thermal stability, making it suitable for high temperature applications.
JOURNAL OF THEORETICAL AND APPLIED MECHANICS
(2021)
Article
Chemistry, Physical
Dominik Kukla, Mateusz Kopec, Kehuan Wang, Cezary Senderowski, Zbigniew L. Kowalewski
Summary: This study monitored the fatigue performance of aluminide layer-coated and as-received MAR 247 nickel superalloy using nondestructive, eddy current methods, and found that fatigue performance was influenced by the initial microstructure of the alloy and the thickness of the aluminide layer. Additionally, the methodology allowed in situ eddy current measurements to locate potential crack initiation areas and track their propagation during loading cycles.
Article
Chemistry, Physical
Tomasz Libura, Rodrigue Matadi Boumbimba, Alexis Rusinek, Zbigniew L. Kowalewski, Tadeusz Szymczak, Pierre Gerard
Summary: This study focuses on the impact resistance of fully recyclable thermoplastic ELIUM acrylic resin reinforced by glass fabric woven. Experimental work indicates that uniaxial cyclic loading leads to a reduction in impact resistance, especially at high impact energy levels. SEM and CT observations reveal that the damage area increases with higher strain amplitude and impact energy.
Article
Engineering, Civil
M. Kopec, A. Brodecki, D. Kukla, Z. L. Kowalewski
Summary: This research compared the effectiveness of digital image correlation (DIC) and electronic speckle pattern interferometry (ESPI) in monitoring fatigue damage in steel specimens, finding that although DIC has lower resolution, it is more effective in monitoring fatigue behavior and indicating potential failure areas.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
M. Anil Kumar, K. E. N'souglo, J. A. Rodriguez-Martinez
Summary: This paper develops a linear stability analysis to predict necking instabilities in porous ductile plates subjected to dynamic biaxial stretching. The study provides insights into the interplay between porosity and inertia on plastic localization, and compares theoretical predictions with finite element calculations, showing good agreement. The original formulation serves as a basis for analytically modeling the dynamic formability of porous ductile plates and can be extended to consider more complex porous plasticity theories.
INTERNATIONAL JOURNAL OF FRACTURE
(2021)
Article
Engineering, Mechanical
A. R. Vishnu, M. Marvi-Mashhadi, J. C. Nieto-Fuentes, J. A. Rodriguez-Martinez
Summary: This paper presents new insights into the role of porous microstructure on dynamic shear localization. Finite element calculations of electromagnetically collapsing thick-walled cylinders were performed, and the numerical simulations showed that voids promote dynamic shear localization and affect the nucleation and development of shear bands.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Engineering, Mechanical
N. Hosseini, J. C. Nieto-Fuentes, M. Dakshinamurthy, J. A. Rodriguez-Martinez, G. Vadillo
Summary: This study reveals the effect of material orientation and angular misalignment on void growth, and proposes a strategic utilization of material orientation and angular misalignment to control void growth.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Mechanics
T. dos Santos, J. C. Nieto-Fuentes, N. Hosseini, J. A. Rodriguez-Martinez
Summary: This paper investigates the steady-state dynamic radial expansion of a pressurized circular cylindrical cavity in an infinite porous medium. The results show that the formation of plastic shocks is delayed for oblate voids compared to spherical and prolate voids.
Article
Engineering, Mechanical
J. C. Nieto-Fuentes, N. Jacques, M. Marvi-Mashhadi, K. E. N'souglo, J. A. Rodriguez-Martinez
Summary: This paper investigates the effect of porous microstructure on the necking formability of ductile sheets subjected to dynamic in-plane stretching. It compares finite element calculations with actual void distributions obtained from additively manufactured materials to simulations with a continuum plasticity theory that considers porosity as an internal state variable. The results show that the necking forming limits obtained from the two methods are in qualitative agreement, with the simulations including actual void distributions predicting greater necking strains. The study also reveals that voids promote plastic localization and their spatial distribution heterogeneity affects plastic localization.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
K. E. N'souglo, K. Kowalczyk-Gajewska, M. Marvi-Mashhadi, J. A. Rodriguez-Martinez
Summary: In this paper, the effect of initial texture on multiple necking patterns in ductile metallic rings subjected to rapid radial expansion was investigated using finite element calculations. The material behavior was modeled using the elasto-viscoplastic single crystal constitutive model developed by Marin specialIntscript. The polycrystalline microstructure of the ring was generated using random Voronoi seeds. The results showed that the spatial distribution of grains, grain size, and initial texture have significant effects on the formation of necks.
MECHANICS OF MATERIALS
(2023)
