Article
Engineering, Manufacturing
Kumar G. Praveen, Suresh Kurra
Summary: Incremental Tube Forming (ITF) is a new forming process used in automotive, aerospace, and heavy industries to transform the ends of tubes into desired shapes, with a focus on analyzing tube deformation behavior for successful forming. Experimental and simulation results show accurate thickness variation and strain distribution at different wall angles.
MATERIALS AND MANUFACTURING PROCESSES
(2021)
Article
Engineering, Geological
Daniel Fraser, Raoof Gholami, Mohammad Sarmadivaleh
Summary: Magnitude and direction of in-situ stresses are crucial inputs for geomechanical analysis, with Deformation Rate Analysis (DRA) being an effective method for unconventional shale gas reservoirs. However, the elapsed time between sample extraction and testing, as well as the impact of loading cycles on results, should not be ignored during laboratory measurements.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Engineering, Manufacturing
Wenbin Zhou, Jianguo Lin, Daniel S. Balint, Trevor A. Dean
Summary: This paper proposes a deformation mechanism map to clarify the interacting effect of deformation conditions (temperature and strain rate) on workpiece behavior in metal forming processes. The rate type deformation equations, which comprehensively model the effect of temperature and strain rate on deformation mechanism characteristics, are elucidated. Additionally, examples of Ti-6Al-4V and Al-Mg alloy are used to demonstrate the application of these equations.
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE
(2021)
Article
Nanoscience & Nanotechnology
Hidetoshi Somekawa, Motohiro Yuasa, Daisuke Ando, Yoshikazu Todaka
Summary: The application of large strain to Mg-9at.%Y-6at.%Zn alloy leads to the formation of high density deformation kink boundaries. Shear strain is a controllable parameter for inducing kink boundaries effectively, especially in wrought-processed alloys containing the LPSO phase.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Review
Automation & Control Systems
Malik Hassan, G. Hussain, Hongyu Wei, Abdul Qadeer, Mohammed AlKahtani
Summary: This article reviews the studies on single-point incremental forming (SPIF) of polymers, highlighting key aspects such as deformation mechanics, failure modes, formability, forming forces, springback, and post-forming material characteristics. The differences between SPIF of polymers and metals are outlined, emphasizing the importance of operating parameters and material in process performance. Recommendations include adoption of innovative technology and establishment of a larger database to enhance industrial viability of the process.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Jacek Karpiesiuk, Tadeusz Chyzy
Summary: The study showed that the lightweight floor system (LFS) with a heating coil is safe for use, as the stress of each floor component was found to be much lower than their strength. The results of the analysis can provide valuable guidance for the design of heated/cooled LFS systems.
Article
Automation & Control Systems
Hassan Badparva, Hassan Moslemi Naeini, Mohammad Mehdi Kasaei, Yaghoub Dadgar Asl, Behnam Abbaszadeh, Lucas F. M. da Silva
Summary: Flexible roll forming (FRF) is an innovative process for producing variable cross-section profiles needed in automotive lightweight structures. This paper provides a new understanding of the deformation length in FRF through experimental tests and numerical simulations. The results show that unlike conventional roll forming, the deformation length in FRF varies considerably with maximum and minimum values appearing in the stretching and compression zones respectively. It is recommended to consider the deformation length in the stretching zone when designing the interstand distance. The results also indicate that increasing the forming angle a, flange length F, and yield strength Y, and decreasing thickness t, will increase the deformation length in all regions of a variable cross-section profile.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Abhishek Kumar, Amber Shrivastava, K. Narasimhan, Sushil Mishra
Summary: Compared to the conventional sheet metal forming process, incremental sheet forming achieves higher limiting strain and increased formability. However, the higher strain level may result in non-uniform thinning and different levels of deformation in different sections of the component. This study investigates the deformation mechanism during incremental sheet metal forming by studying the microstructural and texture evolution in a truncated cone. The results show the formation of subgrains and the evolution of shear texture, indicating the presence of through thickness shear and its contribution to the higher forming limit in the process.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Engineering, Geological
Yizhuo Li, Hani S. Mitri
Summary: In-situ stress measurements away from underground mine work areas do not capture the mining-induced stresses, which differ significantly from pre-mining stresses. Therefore, a practical method to estimate mining-induced stresses near a mining face is needed. This study presents a methodology based on rock core deformations to determine mining-induced stresses near mine openings. The analytical solution has been validated with laboratory experiments, showing good agreement with applied stresses.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Materials Science, Paper & Wood
Luiz G. Greca, Konrad W. Klockars, Orlando J. Rojas, Blaise L. Tardy
Summary: A wide range of extraction processes and wet processing methods have been explored to improve the opto-mechanical properties of nanocellulosic materials. However, the impact of drying stresses on performance has been scarcely examined. Drying is a critical step that significantly affects the properties of nanocellulosic materials, and it can be utilized to generate structures with enhanced properties.
Article
Engineering, Industrial
Zhidong Chang, Jun Chen
Summary: By considering the effects of bending, shearing, and cyclic loading, new analytical formulas of stress triaxiality were derived, and a novel analytical prediction model of fracture strain was proposed by combining with a generalized ductile fracture criterion. Experimental and finite element analysis validated the accuracy of the models, and the effects of deformation mechanisms on fracture strain were evaluated in details.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Chen Wang, Binkai Zhang, Dongfang Yao, Zhuangzhuang Tian, Chunjiang Zhao
Summary: In this paper, the forming law of a bimetallic tube in the rotary ring spinning process was analyzed through numerical simulation and experimentation. The results showed that the deformation coordination of the basic and cover tubes increased with increasing press amount, while the feed ratio had a smaller effect on the thickness variation. The three-way strain of the tubes and the influence of process parameters on the equivalent strain were also studied, revealing that the radial strain was the largest, followed by axial strain and tangential strain, and the press amount had the largest effect on the equivalent strain.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Physical
Henrik Lund Frandsen, Christodoulos Chatzichristodoulou, Benoit Charlas, Ragnar Kiebach, Kawai Kwok, Poul Norby, Peter Vang Hendriksen
Summary: Experimental results demonstrate that residual stresses in solid oxide cell are relaxed and approach zero during the chemical reduction of the fuel electrode, which is crucial for understanding and modeling stress variation during SOC stack assembly. The in-plane macro-strain and stresses in each layer are determined by in-situ X-ray diffraction, and the relaxation of stresses is attributed to accelerated creep in the nickel phase of the fuel electrode.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Multidisciplinary
Oleg Matvienko, Olga Daneyko, Tatiana Kovalevskaya, Anton Khrustalyov, Ilya Zhukov, Alexander Vorozhtsov
Summary: The experimental and theoretical investigation of aluminum alloys strengthened by dispersed nanoparticles and the significance of various strengthening mechanisms were explored. The study found that strengthening induced by thermal mismatch is the most significant contribution to yield strength improvement, while increments due to other mechanisms are lower. Thermal stresses can affect the assessment of yield strength by increasing effective particle size.
Article
Engineering, Mechanical
Tengfei Wang, Aki Mikkola, Marko K. Matikainen
Summary: This paper thoroughly investigates beam elements based on the absolute nodal coordinate formulation (ANCF), with a focus on higher-order elements in terms of interpolation procedure and numerical performance. The study proposes a straightforward and modularized procedure to construct shape functions, and examines how axial and transverse interpolation strategies impact element performance. The research analyzes two beams in a pure bending scenario and concludes that higher-order interpolation is necessary to accurately represent highly curved deformation modes and alleviate Poisson locking. It also discusses the accuracy, convergence, and numerical stability of different beam elements through case studies. The paper highlights the importance of order selection and transverse interpolation in achieving accurate and stable results for beam simulations.
JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS
(2022)
Article
Automation & Control Systems
Chenhao Wang, William J. T. Daniel, Haibo Lu, Sheng Liu, Paul A. Meehan
Summary: This study evaluates the applicability of six damage models for failure prediction in Two-point incremental forming (TPIF), and finds that the Ayada model is more accurate in predicting failure location and depth. Additionally, it is noted that double-sided contact in TPIF alters the accumulation of damage.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Zhen Qian, Yitian Zhao, Chang Wang, Sheng Liu, Ziliu Xiong, Paul A. Meehan, William J. T. Daniel, Shichao Ding
Summary: This study investigates the effects of three different loading patterns on a free U-bending profile, showing that a large bending ratio produces a thinning pattern with three peaks, while a small bending ratio only has one peak. Experimental results reveal that tooling marks contain both adhesive and abrasive wear.
JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
Paul A. Meehan, Andrew C. Leslie
Summary: This study investigates the occurrence, growth, and mitigation of brake squeal noise using a predictive analytical coupled modal model. The closed form analytical criteria for brake squeal reveal that amplitude primarily depends on sliding velocity with minimal differences due to different mechanisms. The results provide important insight into mitigating brake squeal noise.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Automation & Control Systems
An He, Chenhao Wang, Sheng Liu, Paul A. Meehan
Summary: Two control algorithms based on the MPC framework were proposed to achieve more precise geometry of multi-pass ISF products in this study. The developed MPCs were comparatively validated by physical benchmark tests, and MPC-2 showed better performance in reducing geometric errors in multi-pass ISF processes compared to MPC-1.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Industrial
Zinan Cheng, Yanle Li, Jinhui Li, Fangyi Li, Paul A. Meehan
Summary: The study established a hybrid constitutive model to describe material behaviors during ultrasonic-assisted incremental sheet forming, showing good predictability in simulation results and confirming the enhancement of formability. Analysis of material microstructural features revealed the occurrence of dynamic recovery in the material.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Paul A. Meehan
Summary: Research shows that chaotic instability in brake squeal is caused by mode coupling instability via friction. Conservative analytical conditions were developed and numerically verified for suppressing brake squeal chaos. The results provide predictive insight into conditions under which brake squeal chaos occurs and its suppression.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Chemical
Chih-Ling Lin, Khosro Fallahnezhad, Osama Brinji, Paul A. Meehan
Summary: This study examined the false brinelling wear resistance of four commercial greases with different compositions in a test rig simulating roller bearings during rail/sea transportation. Greases containing ZDDP showed superior reduction in false brinelling, while greases without ZDDP were able to reduce wear by incorporating more abundant and less viscous oils. The results highlight the importance of ZDDP as an additive in grease to protect roller bearings against false brinelling during transportation.
Article
Engineering, Mechanical
Osama Brinji, Khosro Fallahnezhad, Paul A. Meehan
Summary: The experiments investigated the effects of normal pressure, sliding amplitude, and oscillating sliding frequency on friction, wear coefficient, and threshold energy for wear activation in 52100 high carbon bearing quality steel during a false brinelling test. The results showed that changes in normal pressure and sliding amplitude affected the friction and wear coefficients, while oscillating sliding frequency had little influence. Different conditions did not significantly impact the threshold energy for wear activation.
Article
Materials Science, Multidisciplinary
Sattar Ullah, Peng Xu, Xiaoqiang Li, Yanle Li, Kai Han, Dongsheng Li
Summary: Low geometric accuracy is a major limitation in double-sided incremental forming (DSIF), but various methodologies have been proposed to improve it, including toolpath compensation, adaptation, material redistribution, and heat-assisted processes. However, there is relatively less research on toolpath adaptation and material redistribution in terms of geometric accuracy.
Article
Acoustics
Paul A. Meehan
Summary: This study investigates the occurrence, limit cycle amplitude, and chaotic behavior of flutter using a binary coupled modal model. Closed form analytical predictions are provided to understand the aeroelastic phenomenon. The model considers modal coupling through stiffness and damping terms, identifying two forms of flutter. Analytical criteria for flutter onset are developed, including a new necessary divergence criterion. The model is validated with classical airfoil results and enables the detection of viscous mode coupling flutter. The occurrence and conditions of both stiffness and viscous mode coupling flutter are numerically verified. Efficient analytical prediction for flutter amplitude is also demonstrated. Lastly, the occurrence of chaotic flutter is confirmed using a nonlinear investigation.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Energy & Fuels
Ruth Knibbe, Damien Harding, Emily Cooper, Jonathan Burton, Sheng Liu, Zhila Amirzadeh, Roger Buckley, Paul A. Meehan
Summary: This paper investigates the decarbonisation of heavy haul rail and demonstrates the limitations of current battery technologies. Lithium iron phosphate (LFP) is identified as the most suitable battery solution based on cost, energy density, cycle lifespan, and locomotive data. The study proposes three platforms for heavy haul rail decarbonisation: battery electric locomotives, battery electric tenders, and hydrogen fuel cell electric tenders.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Engineering, Mechanical
Paul A. Meehan
Summary: This study investigates and suppresses the chaotic motion in fluttering wind turbine blades by developing an efficient analytical predictive model. The research finds that flutter instability can lead to limit cycle flutter and subsequent transition to chaos. However, by adjusting system parameters, especially small changes in tip speed ratio and stall slope factor, chaos can be eliminated or suppressed. The predictive model proposed in this study provides almost instantaneous calculations representing thousands of numerical simulations.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Mechanical
A. Mannan, W. J. T. Daniel, P. A. Meehan
Summary: This paper investigates the effect of race conformity on wear distribution in a railway spherical roller bearing and finds that lower conformity leads to lower wear. Ceramic rolling elements show lower wear than steel rolling elements.
Article
Engineering, Manufacturing
Chenhao Wang, An He, Sheng Liu, Paul A. Meehan
Summary: This study proposes an online learning-based MPC approach to enhance accuracy in TPIF. Experimental results show that the developed controller can significantly improve shape accuracy while maintaining the safety of the manufacturing process.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Proceedings Paper
Engineering, Civil
Sundar Shrestha, Maksym Spiryagin, Harold Harisson, Ingemar Persson, Paul Meehan, Qing Wu, Valentyn Spiryagin, Chris Bosomworth, Colin Cole
Summary: A special methodology for delivering changes in friction coefficients has been developed and the results are analyzed using raw data from a hand-operated tribometer. The study shows that this methodology has potential benefits for further advancement of wheel-rail damage theories for contaminated rails.
ICRT 2021: PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAIL TRANSPORTATION
(2022)
