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Thickness increase of skin layer on aluminum foam surface and compressive strength by combination of friction stir incremental forming and incremental hammering

Ryo Matsumoto, Seishu Mori, Masaaki Otsu, Hiroshi Utsunomiya
2016 Keikinzoku/Journal of Japan Institute of Light Metals  
Friction stir incremental forming (FSIF) and incremental hammering (IH) processes were combined to form skin surface layer on a closed-cell type aluminum foam without causing the inside fracture.  ...  The specific compressive strength of the aluminum foam with the friction stirred surface layer was 1.2-1.6 times higher than that without the friction stirred surface layer due to the formation of the  ...  Table 1 1 FSIF, IH Fig. 2 Illustrations of friction stir incremental forming (FSIF) and incremental hammering (IH) processes for aluminum foam surface (ω: tool rotation rate, f: tool feed rate, p x , p  ... 
doi:10.2464/jilm.66.419 fatcat:zonc35ewqrhfdcgqufacxhutcm

Integrating a New Software Tool Used for Tool Path Generation in the Numerical Simulation of Incremental Forming Processes

Daniel Nasulea, Gheorghe Oancea
2018 Strojniski vestnik  
Highlights • The paper states the necessity of reducing the FEM model preparation time for ISF processes by reducing the difficulty of describing the forming tool motions for numerical simulation applications  ...  . • A new stand-alone software tool is developed to convert a CNC G-code file into a format specific for ANSYS, in order to facilitate swift tool path description in ISF processes. • The new software tool  ...  The data that can be accepted by ANSYS are a set of lines or arrays in a specific format for each position point parameter X, Y and Z and also for the tool position time.  ... 
doi:10.5545/sv-jme.2018.5475 fatcat:rhr5ineiafdrdjfafrwbapblui

Force Prediction for Incremental Forming of Polymer Sheets

Gustavo Medina-Sanchez, Alberto Garcia-Collado, Diego Carou, Rubén Dorado-Vicente
2018 Materials  
This work presents two procedures for predicting axial force in Single Point Incremental Forming (SPIF) of polymer sheets.  ...  A set of experimental tests was used to validate the numerical model, and to determine the specific energy for two polymer sheets of polycarbonate (PC) and polyvinyl chloride (PVC).  ...  Conflicts of Interest: No competing financial interests exist.  ... 
doi:10.3390/ma11091597 pmid:30177631 pmcid:PMC6165007 fatcat:ebsfowztbjfttldtlginzup4sm

Granger Independent Martingale Processes [article]

Umberto Cherubini, Fabio Gobbi, Sabrina Mulinacci, Silvia Romagnoli
2016 arXiv   pre-print
The martingale condition is imposed in a general multidimensional Markov setting to which we only add the restriction of no-Granger-causality of the increments (Granger-independent increments).  ...  We call this class of processes GIMP (Granger Independent Martingale Processes).  ...  In this example we analyze a specific model in which the increments of each process follow a GARCH dynamics.  ... 
arXiv:1607.01519v1 fatcat:fb6mgytldzbevgmozddwtlcueu

Some Further Results on the Tempered Multistable Approach

Olivier Le Courtois
2018 Asia-Pacific Financial Markets  
and for asymmetrical independent increments tempered multistable processes.  ...  We also show that both processes are semimartingales, which is a convenient property in finance. Next, we study the structure of autocorrelations that is conveyed by this approach.  ...  Acknowledgements The author wishes to thank Jacques Lévy-Véhel for many fruitful discussions on the topic of the paper and for introducing him to this field of research.  ... 
doi:10.1007/s10690-018-9240-y fatcat:lr5yrrsymngvvfvq3ej3dd7a2a

An Eulerian approach for die compaction processes

W. A. M. Brekelmans, J. D. Janssen, A. A. F. Van De Ven, G. De With
1991 International Journal for Numerical Methods in Engineering  
As a spatially fixed finite element mesh is applied, rezoning is governed by the process specification and not, as in the Lagrangian approach, by the mesh distortion.  ...  For the analysis of deformation processes the Eulerian approach is usually formulated in material velocities.  ...  An incremental deformation process during a time step t < z < t + At is considered.  ... 
doi:10.1002/nme.1620310307 fatcat:t2v7c7auwzdc7jor6bmy7ejvyq

An assessment approach of land-use to resource-based cities: a case study on land-use process of Daqing region

S. Y. Zang, X. Huang, X. D. Na, L. Sun
2015 International Journal of Environmental Science and Technology  
To distinguish the features of the processes of land-use change in the resourcebased region from the others, however, some indicators (such as specific driving efficiency and specific economic profitability  ...  land change process characterizes land-use feature of typical resource-based city.  ...  The general form of Z-H model is where DL mþ1 i is the increment of land type i in stage m ?  ... 
doi:10.1007/s13762-015-0797-y fatcat:ottguv7gjfgnhcithvc7pvaqdm

Zero Defect Software: Cleanroom Engineering [chapter]

Harlan D. Mills
1993 Advances in Computers  
., 1987b): Specification: First, a specification team creates an incremental specification that defines a pipeline of software increments that accumulate into the final software product, which includes  ...  First, one team of specification engineers creates formal specifications and breaks them into increments for development and certification.  ... 
doi:10.1016/s0065-2458(08)60269-7 fatcat:pq4lkokmuraidj7xj56cslcj44

Transformed Lévy processes as state-dependent wear models

Ji Hwan Cha, Sophie Mercier
2019 Advances in Applied Probability  
We also study positive dependence properties and stochastic monotonicity of increments.  ...  We investigate the impact of the current state on the future increment level and on the overall accumulated level from a stochastic monotonicity point of view.  ...  as a specific TR Lévy process.  ... 
doi:10.1017/apr.2019.21 fatcat:35mrux2u5zh75khrhoexbze55y

Investigating the Improvement of Decoding Abilities and Working Memory in Children with Incremental or Entity Personal Conceptions of Intelligence: Two Case Reports

Marianna Alesi, Gaetano Rappo, Annamaria Pepi
2016 Frontiers in Psychology  
Incremental or Entity personal conceptions of intelligence may be assumed to be an important prognostic factor to overcome domain-specific deficits.  ...  Specifically, incremental students tend to be more oriented toward change and autonomy and are able to adopt more efficacious strategies.  ...  Incremental or Entity personal conceptions of intelligence may be assumed to be an important prognostic factor to overcome domain-specific deficits.  ... 
doi:10.3389/fpsyg.2015.01939 pmid:26779069 pmcid:PMC4700145 fatcat:hvttzaqvobflbas74j5e4xx25a

Incremental Realization of Safety Requirements: Non-determinism vs. Modularity [chapter]

Ali Ebnenasir
2015 Lecture Notes in Computer Science  
This paper investigates the impact of non-determinism and modularity on the complexity of incremental incorporation of safety requirements while preserving liveness (a.k.a. the problem of incremental synthesis  ...  We also provide a roadmap for future research on exploiting the benefits of modularization while keeping the complexity of incremental synthesis manageable.  ...  program components/processes can atomically read the state of other processes.  ... 
doi:10.1007/978-3-319-24644-4_11 fatcat:53untalh2zenhnyfs6t4gyzeua

Influences of soil hydraulic and mechanical parameters on land subsidence and ground fissures caused by groundwater exploitation

Xing-xian CHEN, Zu-jiang LUO, Shi-ling ZHOU
2014 Journal of Hydrodynamics  
In addition, the vertical hydraulic conductivity z k and the horizontal hydraulic conductivity s k also have a great influence on the land subsidence and the ground fissures.  ...  It is shown that the elastic modulus E , the Poisson ratio , the specific yield and the soil cohesion c have a great influence on the land subsidence and the ground fissures.  ...  The process is closely related to the soil hydraulic and mechanical parameters.  ... 
doi:10.1016/s1001-6058(14)60018-4 fatcat:t5vsmqi535ek7dgiazf3gujq4a

A comparison of maximum likelihood and absolute moments for the estimation of Hurst exponents in a stationary framework [article]

Matthieu Garcin
2022 arXiv   pre-print
But this method is biased when applied to a stationary version of X, in particular an inverse Lamperti transform of X, with a linear time contraction of parameter θ.  ...  The absolute-moment method is widespread for estimating the Hurst exponent of a fractional Brownian motion X.  ...  moments of increments of the transformed process L H ,θ Y .  ... 
arXiv:2003.02566v3 fatcat:73pm4uniw5hnlg2xo3jvw2ok7m

Formal Extreme (and Extremely Formal) Programming [chapter]

Ángel Herranz, Juan José Moreno-Navarro
2003 Lecture Notes in Computer Science  
Incremental development is quite similar to the refinement process in FM: specifications evolve to code maintaining previous functionality.  ...  This paper is an exploratory work were the authors study how the technology of Formal Methods (FM) can interact with agile process in general and with Extreme Programming (XP) in particular.  ...  In particular, unit testing, refactoring, and, in a more detailed way, incremental development have been studied from the prism of FM.  ... 
doi:10.1007/3-540-44870-5_12 fatcat:pjpewmfycvasbl6s2gzhlvkqfq

Experimental Study the Effect of Tool Geometry on Dimensional Accuracy in Single Point Incremental Forming (SPIF) Process

Aqeel Sabree Bedan, Halah Ali Habeeb
2018 مجلة النهرين للعلوم الهندسية  
One limitations of single point incremental forming (SPIF) process is the error occur between the CAD design and the product profile.  ...  Incremental forming is a flexible sheet metal forming process which performed by utilizes simple tools to locally deform a sheet of metal along a predefined tool path without using of dies.  ...  The main limitations of single point incremental forming process are bending of sheet occurs as a result of tool drawing effect; it can be minimized by using a backing plate, but this increases the costs  ... 
doi:10.29194/njes21010108 fatcat:dw4cxuoncvcxraz76janskoeey
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