Article
Engineering, Mechanical
J. Park, K. Lee, J. -H. Kang, J. -Y. Kang, S. H. Hong, S. W. Kwon, M. -G. Lee
Summary: A microstructure-based integrated crystal plasticity and continuum damage mechanics model is proposed for simulating rolling contact fatigue, with a focus on damage formation mechanisms and predictive methods. Numerical sensitivity analysis is conducted to demonstrate how to optimize the RCF process for improving the performance of materials and parts.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Materials Science, Multidisciplinary
Jee-Hyun Kang, Jungwoong Kim, Jun-Yun Kang, Soon-Woo Kwon, Min-Woo Kang, Seung Hyun Hong
Summary: This study provides an in-depth characterization of the formation mechanism of the dark-etching region (DER) caused by rolling contact fatigue in bearing steel. The results reveal that the accumulation of plastic flow and dynamic recrystallization contribute to the hardness reduction and etching behavior, which may lead to spalling of the bearing.
Article
Chemistry, Physical
Tao Cong, Bo Jiang, Qiang Zou, Sancheng Yao
Summary: Microalloyed steels with vanadium addition were investigated for their potential to prevent spalling and increase wheel life on Chinese railroads. Results showed that vanadium addition led to the precipitation of vanadium carbides in the pro-eutectoid ferrite region, which resulted in an increase in yield strength without affecting the tensile strength, elongation, or hardness. Furthermore, microalloyed wheel steel exhibited a lower ratcheting strain rate compared to plain-carbon wheel steel.
Article
Engineering, Mechanical
Akhil Vijay, Farshid Sadeghi
Summary: This paper presents a two-stage approach for modeling the initiation and propagation phases of rolling element bearing failures. By using crystal plasticity and cohesive elements, the method is able to simulate the initiation and growth of cracks, showing good correlation with experimental data.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
X. C. Li, H. H. Ding, W. J. Wang, J. Guo, Q. Y. Liu, Z. R. Zhou
Summary: The study explored the relationship between microstructure and wear characteristics of rail materials, finding that the size of pearlite colony has the most significant impact on wear resistance.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Xingyu Lu, Lina Zhou, Chengshuai Lei, Hongwei Liu, Huifang Lan
Summary: The microstructure evolution and formation mechanism of lighting etched region (LER) during rolling contact fatigue (RCF) in M50 steel were systematically investigated. LER was found to be a type of microstructure degeneration caused by the accumulation of plastic strain. The study identified four stages of microstructure evolution during RCF in LER, with changes in dislocation density, grain boundaries, and micro-hardness.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Mechanical
Fumiyoshi Yoshinaka, Takahiro Sawaguchi, Susumu Takamori, Satoshi Emura, Yasuhiko Inoue
Summary: A bidirectional transformation mechanism (B-TRIP) between gamma-austenite and epsilon-martensite has been utilized to develop fatigue-resistant steel with high reversibility in dislocation motion. By modifying the Fe-15Mn-11Cr-7.5Ni-4Si steel, the Fe-18Mn-11Cr-7.5Ni-4Si B-TRIP steel was designed and showed a two-fold improvement in fatigue life compared to the previous steel. Microstructural analysis revealed that the enhanced irreversible alpha'-martensitic transformation in the previous steel negatively affected the durability of B-TRIP.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
S. Y. Zhang, X. J. Zhao, H. H. Ding, M. Spiryagin, J. Guo, Q. Y. Liu, W. J. Wang, Z. R. Zhou
Summary: Dents of different sizes exhibit similar behavior in the initiation and propagation of RCF cracks, but vary in terms of crack initiation lifetime and dent lasting time. The dent size plays a crucial role in the RCF evolution process.
Article
Engineering, Mechanical
Steven J. Lorenz, Farshid Sadeghi
Summary: This study presents an investigation into the rolling contact fatigue performance of AISI M50 bearing steel under a range of Hertzian contact pressures. Both experimental and analytical approaches were used to establish the relationship between contact pressure and fatigue life. The results show good agreement between the experimental and analytical data sets, highlighting the significance of combining experimental tools and computational models in assessing the RCF performance of bearing materials.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Shuto Takayasu, Osamu Umezawa, Keisuke Yari, Kazuya Hashimoto, Taichi Fuchigami
Summary: The study characterized the tribofilm and surface microcracks on carburized SCM420 steel after a two-roller-type pitting test. It found that the presence of tribofilm affected the tangential force and rolling contact fatigue (RCF) lifetime, while microcracks had an impact on the dynamic reconstruction of contact surfaces and subsurface structures.
Article
Engineering, Mechanical
Kiarash Jamali Dogahe, Vinzenz Guski, Marijo Mlikota, Siegfried Schmauder, Walter Holweger, Joshua Spille, Joachim Mayer, Alexander Schwedt, Bernd Goerlach, Juergen Wranik
Summary: The White Etching Crack (WEC) phenomenon is a severe damage mode in bearing applications. This study found that nano-sized pores exist in the raceway surface, affecting the initiation and propagation of fatigue cracks.
Article
Materials Science, Multidisciplinary
Hanghang Liu, Paixian Fu, Chen Sun, Ningyu Du, Hongwei Liu, Yanfei Cao, Dianzhong Li
Summary: A novel mechanism is proposed to refine metastable M2C in M50 steel by implementing a well-designed pre-deformation treatment. Compared to traditional diffusion treatment, this new mechanism reduces the percentage of M2C area by nearly 30 pct. The transition mechanism of M2C transforms into a coexisting interfacial and internal nucleation mode due to deformation dislocations. Increased nucleation sites and rapid diffusion channels of alloying elements through deformation accelerate the transformation and diffusion dissolution of M2C. The significant refinement of primary carbide leads to longer fatigue life and greater reliability under fatigue loading.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Engineering, Mechanical
Guanzhen Zhang, Chunpeng Liu, Si Wu, Tao Cong, Yi Wu, Bin Zhang, Ruiming Ren
Summary: The rolling contact fatigue (RCF) failure mechanism of ZC-L cast steel wheels was analyzed using OM, SEM, and TEM. The results showed that fatigue flaking occurred on the macroscopic surface of the wheel tread after RCF failure. RCF cracks mainly formed at the interface between subsurface white etching microstructure (WEM) and the matrix and at the edge of casting defects. The subsurface WEM and casting defects were found to be the main causes of RCF failure.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Rui Wang, Zhijie Yan, Jie He, Weihui Fan, Yihong Li, Yong Hu, Yan Kang, Jing Fan, Zhiqiang Yu, Yuhong Zhao, Jurgen Eckert
Summary: The microstructure and mechanical properties of 6Cr13 martensitic stainless steel were studied after cold rolling and subsequent heat treatments. The cold rolling process dissolves and fragments the carbides, resulting in their decreased size. The microstructure is refined and a high density of dislocations is induced by the cold rolling, which persists even after heat treatments. Reversed austenite forms during tempering, resulting in high strength, elongation, and microhardness.
MATERIALS CHARACTERIZATION
(2023)
Article
Engineering, Mechanical
Ruijie Zhang, Chunlei Zheng, Chen Chen, Bo Lv, Guhui Gao, Zhinan Yang, Yongqiang Yang, Fucheng Zhang
Summary: The study on the wear and fatigue competition mechanism of a bainitic rail steel revealed that the damage process could be divided into initial, middle, and late stages, with dominant damage mechanisms of wear, wear and fatigue, and fatigue respectively. As rolling cycles increased, retained austenite transformation played a crucial role in achieving dynamic equilibrium between wear and fatigue, effectively controlling the excessive propagation of fatigue cracks.
Article
Engineering, Mechanical
Rosaria Del Toro, Maria Laura De Bellis, Marcello Vasta, Andrea Bacigalupo
Summary: This article presents a multifield asymptotic homogenization scheme for analyzing Bloch wave propagation in non-standard thermoelastic periodic materials. The proposed method derives microscale field equations, solves recursive differential problems within the unit cell, establishes a down-scaling relation, and obtains average field equations. The effectiveness of this approach is validated by comparing dispersion curves with those from the Floquet-Bloch theory.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Yue Bao, Zhengcheng Yao, Yue Zhang, Xueman Hu, Xiandong Liu, Yingchun Shan, Tian He
Summary: This paper proposes a novel triple-gradient phononic acoustic black hole (ABH) beam that strategically manipulates multiple gradients to enhance its performance. The study reveals that the ABH effect is not solely brought about by the thickness gradient, but also extends to the power-law gradients in density and modulus. The synergistic development of three different gradient effects leads to more pronounced and broader bandgaps in PCs.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Matthias Ryser, Jason Steffen, Bekim Berisha, Markus Bambach
Summary: This study investigates the feasibility of replacing complex experiments with multiple simpler ones to determine the anisotropic yielding behavior of sheet metal. The results show that parameter identifiability and accuracy can be achieved by combining multiple specimen geometries and orientations, enhancing the understanding of the yield behavior.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Wenjun Li, Pengfei Zhang, Siyong Yang, Shenling Cai, Kai Feng
Summary: This study presents a novel two-dimensional non-contact platform based on Near-field Acoustic Levitation (NFAL), which can realize both one-dimensional and two-dimensional transportation. Numerical and experimental results prove the feasibility and ease of this method.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Shuo Liu, Lu Che, Guodong Fang, Jun Liang
Summary: This study presents a novel lamina conjugated bond-based peridynamic (BB-PD) model that overcomes the limitations of material properties and is applicable to composite laminates with different stacking sequences. The accuracy and applicability of the model are validated through simulations of elastic deformation and progressive damage behavior, providing an explanation of the damage modes and failure mechanisms of laminated composite materials subjected to uniaxial loading.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Omar El-Khatib, S. Kumar, Wesley J. Cantwell, Andreas Schiffer
Summary: Sandwich-structured honeycombs (SSHCs) are hierarchical structures with enhanced mass-specific properties. A model capable of predicting the elastic properties of hexagonal SSHCs is presented, showing superior in-plane elastic and shear moduli compared to traditional honeycombs, while the out-of-plane shear moduli are reduced.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Zhi-Jian Li, Hong-Liang Dai, Yuan Yao, Jing-Ling Liu
Summary: This paper proposes a process-performance prediction model for estimating the yield strength and ultimate tensile strength of metallic parts fabricated by powder bed fusion additive manufacturing. The effect of main process variables on the mechanical performance of printed metallic parts is analyzed and the results can serve as a guideline for improvement. The accuracy of the proposed model is validated by comparison with literature.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Saman A. Bapir, Kawa M. A. Manmi, Rostam K. Saeed, Abdolrahman Dadvand
Summary: This study numerically investigates the behavior of an ultrasonically driven gas bubble between two parallel rigid circular walls with a cylindrical micro-indentation in one wall. The primary objective is to determine the conditions that facilitate the removal of particulate contamination from the indentation using the bubble jet. The study found that the bubble jet can effectively remove contamination from the indentation for certain ranges of indentation diameter, but becomes less effective for larger indentation diameters.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
E. Polyzos, E. Vereroudakis, S. Malefaki, D. Vlassopoulos, D. Van Hemelrijck, L. Pyl
Summary: This research investigates the elastic and damage characteristics of individual composite beads used in 3D printed composites. A new analytical probabilistic progressive damage model (PPDM) is introduced to capture the elastic and damage attributes of these beads. Experimental results show strong agreement with the model in terms of elastic behavior and ultimate strength and strain.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)