Article
Mathematics, Interdisciplinary Applications
S. F. Maassen, R. Niekamp, J. A. Bergmann, F. Poehl, J. Schroeder, P. Wiederkehr
Summary: The material point method (MPM) is an alternative discretization method for numerical simulations which combines the advantages of Lagrangian representation and Eulerian numerical solution approach. It is particularly useful for modeling high deformations, such as in granular materials in geo-mechanics. By introducing frictional contact in the Split-Hopkinson-Pressure-Bar (SHPB) experiment, the MPM method shows good convergence with finer discretizations and has demonstrated its importance as an alternative simulation technique for problems with high deformation.
COMPUTATIONAL PARTICLE MECHANICS
(2022)
Article
Construction & Building Technology
Zhijie Huang, Wensu Chen, Hong Hao, Roland Aurelio, Zhixing Li, Thong M. Pham
Summary: This study investigates the dynamic compressive and splitting tensile properties of ambient-cured geopolymer concrete (GPC) using split Hopkinson pressure bar (SHPB). The results show that ambient-cured GPC exhibits strain rate sensitivity, with the dynamic increase factor (DIF) increasing with strain rate. The specific energy absorption of ambient-cured GPC under dynamic compression increases linearly with strain rate.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Manish Kumar Gupta
Summary: The study of high strain rate characteristics is essential for understanding the behavior of materials in dynamic conditions, which can be done through experimental techniques or finite element simulations. The results show that the amplitude and duration of waves depend on the parameters of the striker.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Tobias Werling, Georg Baumann, Florian Feist, Wolfgang Sinz, Christian Ellersdorfer
Summary: This study investigated the mechanical behavior of high-voltage busbars under high strain rate loading using a split Hopkinson pressure bar. Two types of busbars were tested, revealing that polyamide 12 insulated busbars have increased safety regarding insulation failure at high loading speeds, while fiber-reinforced polyamide 6 insulated busbars exhibit highly brittle material behavior. The experimental results were complemented with a strain rate-dependent model for thermoplastics, achieving good agreement with the behavior observed.
Article
Materials Science, Multidisciplinary
B. Durand, P. Quillery, A. Zouari, H. Zhao
Summary: A biaxial compression Hopkinson bar set-up is designed to study material behavior under multiaxial dynamic loadings. The setup allows for force measurements and displacement field analysis through digital image correlation. This method provides a way to study material performance and friction behavior at sliding surfaces.
EXPERIMENTAL MECHANICS
(2021)
Article
Engineering, Mechanical
Chenlin Liu, Weibin Wang, Tao Suo, Zhongbin Tang, Yazhou Guo, Yulong Li
Summary: This paper introduces a Combined Tension-Torsion Split Hopkinson Bar system that can load specimens synchronously under high strain rates. The system utilizes electromagnetic energy conversion technique and a new Electromagnetic-release Split Hopkinson Torsion Bar system to achieve precise control and generation of stress pulses.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Construction & Building Technology
Nao Lv, Haibo Wang, Kai Rong, Zhanyang Chen, Qi Zong
Summary: By comparing the HBB system and the SHPB system in stress wave propagation, this study found that the HBB system can effectively reduce lateral dispersion and maintain waveform, while the large diameter SHPB system has the opposite effect. The results suggest that the HBB system is capable of dynamic mechanical property testing of concrete-like materials and provides more detailed information on local mechanical properties of concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Mechanics
K. N. Cundiff, G. Ayoub, A. A. Benzerga
Summary: A complex constitutive relation is identified using inverse modeling, with a focus on a semicrystalline thermoplastic and strain localization. The response of the material is predicted through finite element analysis and a two-phase constitutive relation, which considers temperature and rate sensitivity, plastic flow, pressure sensitivity, softening, hardening, and crystallinity evolution. The methodology effectively replicates experimental results and provides a simpler alternative to accessing intrinsic behavior.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Engineering, Mechanical
Lena Leicht, Tomas Fila, Petr Maca, Manfred Curbach
Summary: This paper presents an innovative technique for measuring the bond stress-slip relationships during dynamic pull-out using a tensile split Hopkinson bar and a near-to-full-scale beam-end specimen. The complex wave propagation behavior during impact is characterized and two methods for separating the longitudinal stress waves are employed. The method is considered suitable for evaluating the dynamic bond stress-slip relationship.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Polymer Science
Xintao Zhu, Xiaojing Zhang, Wenjin Yao, Wenbin Li
Summary: Using a split-Hopkinson pressure bar test instrument with temperature control, this study tested the dynamic mechanical properties of silicone rubber at different temperatures and strain rates. The results showed that silicone rubber is sensitive to both strain rate and temperature, with the yield strength increasing with higher strain rates and showing temperature sensitivity at higher rates.
Article
Engineering, Mechanical
Yifei Meng, Yuting Yang, Weibin Wang, Qingbo Dou, Tao Suo
Summary: An improved high-temperature dynamic torsion experimental method was developed in this study, utilizing an electromagnetic torsional Hopkinson bar equipped with a special system and proposing a double-flange thin-walled tubular specimen, achieving online heating and synchronous assembly successfully. This provides a new approach for studying the shear mechanical properties of materials under high strain rates and high temperatures.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Engineering, Mechanical
Yifei Meng, Yuting Yang, Weibin Wang, Qingbo Dou, Tao Suo
Summary: This study developed an improved high-temperature dynamic torsion experimental method for determining the shear mechanical properties of materials under the coupling effect of high strain rates and high temperatures. By optimizing the specimen design and strain measurement correction method, the accuracy and reliability of the tests were improved. Experimental results demonstrated the suitability of this method for strain rate testing at different temperatures.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2022)
Article
Chemistry, Physical
Georg Baumann, Dominik Niederkofler, Christian Ellersdorfer, Florian Feist
Summary: The study demonstrates that the designed release mechanism leads to sufficiently short and reproducible pulse rising times for both tension and compression waves, allowing for dynamic mechanical characterization of high strength steel materials.
Review
Thermodynamics
Yeon-Bok Kim, Jeong Kim
Summary: In this study, a new model with improved waveform was proposed by redesigning and optimizing the initial SHTB equipment to obtain reliable material properties. Factors affecting a spurious wave were determined and verified using LS-DYNA software. The redesigned model successfully eliminated the spurious wave and improved the waveform compared to the original model.
ADVANCES IN MECHANICAL ENGINEERING
(2023)
Article
Geosciences, Multidisciplinary
Zhoujie Gu, Rongxi Shen, Zhentang Liu, Enlai Zhao, Hailiang Chen, Zichen Yuan, Xiaomeng Chu, Jiawei Tian
Summary: Dynamic failure experiments were conducted on coal samples under dynamic load in a triaxial Split-Hopkinson pressure bar test system to study the dynamic characteristics of coal in a multi-axial pre-stress state. The experiments showed that the 3D pre-stress state significantly affects the dynamic failure of coal. The dynamic initial stress of coal increases linearly with strain, then grows at a reduced rate until the peak strength, and the mechanical curve rebounds notably. The dynamic strength factors of coal vary significantly with the increase of confining pressure.
NATURAL RESOURCES RESEARCH
(2023)
Article
Engineering, Mechanical
Bo Cao, Takeshi Iwamoto
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2018)
Article
Engineering, Mechanical
Hang Thi Pham, Takeshi Iwamoto
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2018)
Editorial Material
Engineering, Mechanical
Fusahito Yoshida, Takeshi Iwamoto, Ryutaro Hino
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2018)
Article
Materials Science, Multidisciplinary
Chong Gao, Takeshi Iwamoto
Article
Engineering, Mechanical
Bo Cao, Takeshi Iwamoto
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2019)
Article
Materials Science, Ceramics
Zhen Wang, Tianhao Guan, Tengfei Ren, Haokang Wang, Tao Suo, Yulong Li, Takeshi Iwamoto, Xiang Wang, Yinmao Wang, Guozhong Gao
CERAMICS INTERNATIONAL
(2020)
Article
Nanoscience & Nanotechnology
Bo Cao, Takeshi Iwamoto, Pinaki Prasad Bhattacharjee
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2020)
Article
Engineering, Mechanical
Chong Gao, Takeshi Iwamoto
Summary: This study introduces a method using thermocouple and infrared detector to measure temperature rise of materials at high strain rates, achieving 10(4)s(-1) strain rate using split Hopkinson pressure bar technique and finite element simulation. The responsiveness and applicability of thermocouple and infrared detector are discussed based on stress waves propagation and comparison with theoretical calculations, showing that both techniques are effective for measuring temperature rise in high strain rate range.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Multidisciplinary
Qian Sun, Bo Cao, Takeshi Iwamoto, Tao Suo
Summary: Research has found that the shape memory effect in Fe-Mn-Si shape memory alloy can be enhanced through a shape memory training process and is affected by the strain rate. By introducing a double momentum-trap structure to eliminate stress waves, reliable experimental results of SME after the training process under impact condition were obtained. The improvement of SME in the alloy after impact loading was compared with that under quasi-static loading through verification processes.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Article
Materials Science, Multidisciplinary
Truong Duc Trinh, Takeshi Iwamoto
Summary: In this study, the relationship between strain-induced martensitic transformation (SIMT) and shear band formation in TRIP steels was explored using numerical simulations. It was found that the distributions of plastic strain and martensitic phase are influenced by the initial crystal orientation, as well as the sizes of embryo and cell, leading to the formation of shear band structures.
Article
Engineering, Mechanical
Chong Gao, Takeshi Iwamoto
Summary: The proposed method of modified Taylor impact test can effectively obtain the stress-strain curve in the plasticity-dominant region, but requires experimental verification. Through experiments and finite element simulations, it was found that reliable stress-strain curves can be successfully obtained at lower impact velocities.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Engineering, Mechanical
Bo Cao, Shiguma Yoshida, Takeshi Iwamoto, Hang Thi Pham
Summary: Investigation on energy absorption of steel with TRIP under bending deformation at high strain rates was carried out through the development of a novel impact small punch testing method based on SHPB technique for austenitic stainless steel SUS304. Results showed the reliability and feasibility of the testing apparatus for impact energy absorption of high toughness materials.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Construction & Building Technology
Bo Cao, Qian Sun, Takeshi Iwamoto
Summary: The acknowledgements express gratitude for financial support from the Iron and Steel Institute of Japan and Amada Foundation, as well as funding from the Deutsche Forschungsgemeinschaft for BC.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2022)
Article
Engineering, Civil
Bo Cao, Qian Sun, Takeshi Iwamoto
Summary: Pipe joints made of iron-based shape memory alloys have lower shape recovery stress which limits their development. Different diameter expansion methods are applied to improve tightening pressure. A systematic understanding of the influence of the diameter expansion method and deformation rates on bending fracture strength has been developed through thorough experiments.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Mechanical
Chong Gao, Takeshi Iwamoto, Yoshikazu Tanaka, Takayuki Kusaka
Summary: For the first time, this study introduced the pulse-shaping technique to the instrumented Taylor impact test to expand the measurability of the stress-strain curve to a higher strain range. The dimensions of the pulse shaper are determined through finite element analyses to suppress excessive local deformation (ELD). The proposed method with a newly designed specimen is validated by conducting real Taylor impact tests.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Baihong Chen, Changyue Liu, Zengting Xu, Zhijian Wang, Rui Xiao
Summary: In this study, both polydomain and monodomain liquid crystal elastomers (LCEs) were synthesized and their shape change with temperature under a certain stress level was characterized. A thermo-order-mechanical coupling model was developed to predict the shape change of LCEs, showing good consistency with experimental results.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Peng Wang, Fei Xu, Yiding Wang, Jun Song, Cheng Chen
Summary: This study investigates the interplay of super-screw dislocations and coherent twin boundary (CTB) in Ni3Al using molecular dynamics simulations and dislocation continuum theory. Various interaction mechanisms are observed depending on the stress and dislocation gliding pathways. A continuum model framework is developed to evaluate the critical shear stress required for CTB to accommodate dislocations along different pathways, considering the effects of anti-phase boundary (APB) and Complex Stacking Fault (CSF). The study suggests that the resistant force of CTB against all gliding dislocations is a more appropriate metric for quantifying its strength.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Chenyu Du, Haitao Cui, Hongjian Zhang, Zhibin Cai, Weikuo Zhai
Summary: A thermal-elastoplastic phase field model was developed to simulate thermal fatigue crack growth. The accuracy and availability of the model were verified through typical examples. The results indicate that the proposed model effectively simulates the process of thermal fatigue crack propagation in elastoplastic solids. The appropriate regularization length needs to be determined based on experimental results.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
J. Carlsson, A. Kuswoyo, A. Shaikeea, N. A. Fleck
Summary: The sensitivity of the compressive strength of a polymeric Kelvin lattice to the presence of an epoxy core is investigated both experimentally and numerically. The study shows that the epoxy core prevents the formation of crush bands in the lattice and changes its deformation mode. At finite strain, the strength of the lattice is degraded by bending failure and cracking of the struts and adjacent core, leading to the formation of vertical fissures.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Saptarshi Paul, Anurag Gupta
Summary: In this study, we investigate the geometry and mechanics of the buckled orthotropic von Karman elastic plate with free boundary condition, in the presence of an isolated positive or negative disclination. The shape of the buckled plate is cone-like for a positive disclination and saddle-like for a negative disclination. With increasing orthotropy, the shape of the buckled plate becomes more tent-like and the Gaussian curvature spreads along the ridge of the tent. The stress fields are focused in the neighborhood of the defect point and the ridge, indicating that most of the stretching energy is accommodated in these singular regions.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Antu Acharya, Vikram Muthkani, Anirvan DasGupta, Atul Jain
Summary: This study proposes filler-based and infill-based strategies for creating auxetic lattices with enhanced stiffness. The elastic properties of the sinusoidal re-entrant honeycomb lattice are developed and validated using finite element models. Parametric studies are conducted to find combinations leading to enhanced stiffness with minor loss in auxeticity. The results demonstrate the possibility of achieving a significant increment in stiffness while retaining significant auxeticity. The proposed approaches outperform existing approaches in terms of stiffness and auxeticity.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Biswajit Pal, Ananth Ramaswamy
Summary: This study presents a multi-scale approach to simulate the shrinkage and creep of concrete, addressing the limitations of existing macroscopic prediction models due to the heterogeneous nature of concrete. The model is validated with experimental data and compared to national codes and macroscopic models, demonstrating its effectiveness in overcoming the gaps in existing models.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Akash Kumar Behera, Mohammad Masiur Rahaman, Debasish Roy
Summary: Ceramics have attractive properties but low fracture toughness is a major drawback. There is interest in improving the mechanical performance of ceramics by tailoring residual stresses. However, there is a lack of computational models that can accurately predict crack paths and quantify the improved fracture toughness.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Bineet Kumar, Sandeep Kumar Dubey, Sonalisa Ray
Summary: This study aims to develop an energy-based theoretical formulation for predicting the evolution of the fracture process zone in concrete under fatigue loading. Experimental results and calibrations indicate that the specimen size and aggregate size affect the fracture behavior and process zone length of concrete.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Zheliang Wang, Hao Sheng, Xinyi Lin, Yifan Rao, Jia Liu, Nanshu Lu
Summary: In this study, an analytical framework is proposed for investigating the behavior of laminated beams with any number of layers under various bending conditions, and the theory is validated through finite element analysis. It was found that the number of layers, applied deformation, layer properties, and layer aspect ratio have an impact on the equivalent flexural rigidity.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Michael Schwaighofer, Markus Konigsberger, Luis Zelaya-Lainez, Markus Lukacevic, Sebastian Serna-Loaiza, Michael Harasek, Florian Zikeli, Anton Friedl, Josef Fussl
Summary: In this study, nanoindentation relaxation tests were re-evaluated on five industrial lignins extracted from different feedstocks. It was found that the viscoelastic properties of all tested lignins were practically identical and independent of the feedstock and the extraction processes.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Tian Han, Dandan Qi, Jia Ma, Chaoyang Sun
Summary: In this study, a generative design method was used to propose new modified lattice structures suitable for tensile and compressive loading conditions. By conducting experimental and finite element analyses, it was confirmed that the derived structures have improved load-bearing capacity and energy absorption compared to the original structures. The effects of shape parameters on mechanical properties were also discussed.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Wenbin Zheng, Jay Airao, Ramin Aghababaei
Summary: Spinodal decomposition of Ti1-xAlxN crystal structure significantly affects their physical properties. This study uses three-dimensional molecular dynamics simulations to investigate the phase transformation mechanism and surface finish during material removal in TiAlN. The simulations reveal that the aluminum content and cutting depth have a significant influence on the phase transformation process through spinodal decomposition.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Atasi Ghosh
Summary: The micro-mechanism of low cycle fatigue deformation behavior has been summarized and the recent development in the approach of numerical simulation of cyclic stress-strain behavior of polycrystalline metallic materials at multi-scale has been discussed.
MECHANICS OF MATERIALS
(2024)
