scholarly journals Modelling and Multi-objective Optimization of Elastic Abrasive Cutting of C45 and 42Cr4 Steels

2021 ◽  
Vol 67 (12) ◽  
pp. 635-648
Author(s):  
Irina Aleksandrova ◽  
Anna Stoynova ◽  
Anatoliy Aleksandrov
Keyword(s):  
Utility Function ◽  
High Performance ◽  
Rotational Frequency ◽  
Cutting Process ◽  
Wheel Wear ◽  
New Approach ◽  
Generalized Utility ◽  
Abrasive Cutting ◽  
Complex Influence ◽  
Response Variables

Elastic abrasive cutting is a new high-performance method to produce workpieces made of materials of different hardness, which ensures lower wear of cut-off wheels and higher quality machined surfaces. However, the literature referring to elastic abrasive cutting is scarce; additional studies are thus needed. This paper proposes a new approach for modelling and optimizing the elastic abrasive cutting process, reflecting the specifics of its particular implementation. A generalized utility function has been chosen as an optimization parameter. It appears as a complex indicator characterizing the response variables of the elastic abrasive cutting process. The proposed approach has been applied to determine the optimum conditions of elastic abrasive cutting of С45 and 42Cr4 steels. To solve the optimization problem, a model of the generalized utility function reflecting the complex influence of the elastic abrasive cutting conditions has been developed. It is based on the findings of the complex study and modelling of the response variables of the elastic abrasive cutting process (cut-off wheel wear, time per cut, cut piece temperature, cut off wheel temperature and workpiece temperature) depending on the conditions of its implementation (compression force F exerted by the cut-off wheel on the workpiece, workpiece rotational frequency nw, cut off wheel diameter ds). By applying a genetic algorithm, the optimal conditions of elastic abrasive cutting of С45 and 42Cr4 steels: ds = 120 mm; F = 1 daN; nw = 63.7 min–1 and nw = 49.9 min–1, respectively for С45 and 42Cr4 steels, have been determined. They provide the best match between the response variables of the elastic abrasive cutting process.

Theoretical Interpretation of High-Performance Chromatographic Data for a Heterogeneous Series of Compounds

1992 ◽  
Vol 57 (1) ◽  
pp. 33-45
Author(s):  
Vladimír Jakuš
Keyword(s):  
Experimental Data ◽  
High Performance ◽  
Theoretical Interpretation ◽  
Retention Data ◽  
Theoretical Evaluation ◽  
New Approach ◽  
Free Energy Of Solvation ◽  
Rp Hplc ◽  
Mobile Phases ◽  
Reversed Phases

A new approach to theoretical evaluation of the Gibbs free energy of solvation was applied for estimation of retention data in high-performance liquid chromatography on reversed phases (RP-HPLC). Simple and improved models of stationary and mobile phases in RP-HPLC were employed. Statistically significant correlations between the calculated and experimental data were obtained for a heterogeneous series of twelve compounds.

Vacuum processed large area doped thin-film crystals: A new approach for high-performance organic electronics

2021 ◽  
Vol 17 ◽  
pp. 100352
Author(s):  
S.-J. Wang ◽  
M. Sawatzki ◽  
H. Kleemann ◽  
I. Lashkov ◽  
D. Wolf ◽  
...  
Keyword(s):  
Thin Film ◽  
Organic Electronics ◽  
High Performance ◽  
Large Area ◽  
New Approach

Preparation and Characterization of Nanocellular Poly(phenylquinoxaline) Foams. A New Approach to Nanoporous High-Performance Polymers

2007 ◽  
Vol 40 (6) ◽  
pp. 2070-2078 ◽  
Author(s):  
Samuel Merlet ◽  
Catherine Marestin ◽  
Fréderic Schiets ◽  
Olivier Romeyer ◽  
Régis Mercier
Keyword(s):  
High Performance ◽  
New Approach ◽  
High Performance Polymers

Ultraschallüberlagertes Trennschleifen von Faserverbundwerkstoffen*/Ultrasound abrasive cutting of fiber composites - Survey on the potential and mode of action

2016 ◽  
Vol 106 (01-02) ◽  
pp. 39-43
Author(s):  
Y. Babenko ◽  
T. Mayer ◽  
A. Gebhardt
Keyword(s):  
Surface Quality ◽  
Process Parameters ◽  
Mode Of Action ◽  
Fiber Composites ◽  
Cutting Process ◽  
Force Analysis ◽  
Abrasive Cutting

Dieser Fachartikel befasst sich mit der Untersuchung des Potentials der Ultraschallüberlagerung beim Trennschleifen moderner Faserverbundwerkstoffe. Es wurde eine Zerspankraftanalyse des Trennschleifprozesses am CFK-Werkstück mit variierenden Prozessparametern durchgeführt. Zudem wurden die Oberflächenqualitäten der Schnittkanten betrachtet.   The presented study describes the investigation of the potential of ultrasound abrasive cutting of modern fiber composites. A force analysis of the abrasive cutting process of CFRP was conducted, while the process parameters were varied. In addition, the surface quality of the machined workpieces was observed.

scholarly journals Development of High-Performance SiCp/Al-Si Composites by Equal Channel Angular Pressing

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 738 ◽  
Author(s):  
Qiong Xu ◽  
Aibin Ma ◽  
Junjie Wang ◽  
Jiapeng Sun ◽  
Jinghua Jiang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Equal Channel Angular Pressing ◽  
High Performance ◽  
Adhesive Wear ◽  
Processing Route ◽  
Matrix Composites ◽  
New Approach ◽  
Angular Pressing ◽  
The Matrix ◽  
Industry Applications

Relatively low compactness and unsatisfactory uniformity of reinforced particles severely restrict the performance and widespread industry applications of the powder metallurgy (PM) metal matrix composites (MMCs). Here, we developed a combined processing route of PM and equal channel angular pressing (ECAP) to enhance the mechanical properties and wear resistance of the SiCp/Al-Si composite. The results indicate that ECAP significantly refined the matrix grains, eliminated pores and promoted the uniformity of the reinforcement particles. After 8p-ECAP, the SiCp/Al-Si composite consisted of ultrafine Al matrix grains (600 nm) modified by uniformly-dispersed Si and SiCp particles, and the composite relative density approached 100%. The hardness and wear resistance of the 8p-ECAP SiCp/Al-Si composite were markedly improved compared to the PM composite. More ECAP passes continued a trend of improvement for the wear resistance and hardness. Moreover, while abrasion and delamination dominated the wear of PM composites, less severe adhesive wear and fatigue mechanisms played more important roles in the wear of PM-ECAP composites. This study demonstrates a new approach to designing wear-resistant Al-MMCs and is readily applicable to other Al-MMCs.

scholarly journals A New Vectorization Technique for Expression Templates in C++

2012 ◽  
Vol 10 (4) ◽  
Author(s):  
J Progsch ◽  
Y Ineichen ◽  
A Adelmann
Keyword(s):  
High Performance ◽  
Performance Gap ◽  
New Approach ◽  
Loop Unrolling ◽  
Basic Linear Algebra Subprograms ◽  
Template Library ◽  
Abstract Interface ◽  
Expression Templates ◽  
Performance Computing ◽  
Expression Template

Vector operations play an important role in high performance computing and are typically provided by highly optimized libraries that implement the Basic Linear Algebra Subprograms (BLAS) interface. In C++ templates and operator overloading allow the implementation of these vector operations as expression templates which construct custom loops at compile time and providing a more abstract interface. Unfortunately existing expression template libraries lack the performance of fast BLAS implementations. This paper presents a new approach - Statically Accelerated Loop Templates (SALT) - to close this performance gap by combining expression templates with an aggressive loop unrolling technique. Benchmarks were conducted using the Intel C++ compiler and GNU Compiler Collection to assess the performance of our library relative to Intel's Math Kernel Library as well as the Eigen template library. The results show that the approach is able to provide optimization comparable to the fastest available BLAS implementations, while retaining the convenience and flexibility of a template library.

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