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Experimental Data Highlighting the Role of Surface Fracture Energy in Quasi-Static Confined Comminution 总被引:1,自引:0,他引:1
Carlos Ovalle Christophe Dano Pierre-Yves Hicher 《International Journal of Fracture》2013,182(1):123-130
Since the pioneering work of Griffith, Linear Elastic Fracture Mechanics has been widely experimentally validated and successfully developed in solid mechanics modeling. However, recent theoretical models applying the energy balance found in Griffith theory specifically for quasi-static confined comminution have until now not been systematically confronted to experiments. In this study, we analyze data of compression tests on crushable sand, where grain breakage has been triggered by flooding the initially dry material at constant stresses. We consider a partition of the dissipation between surface fracture energy and the rearrangement of fragments and grains surrounding crushed particles. Our results show that the role of the surface fracture energy is stressdependent and that its influence becomes less significant at high stresses. 相似文献
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Occurrence and effect of ironing in the hole-flanging process 总被引:1,自引:0,他引:1
Ahmed KacemAbdelkader Krichen Pierre-Yves Manach 《Journal of Materials Processing Technology》2011,211(10):1606-1613
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Tuning fuzzy PD and PI controllers using reinforcement learning 总被引:1,自引:0,他引:1
Hamid Boubertakh Mohamed Tadjine Pierre-Yves Glorennec Salim Labiod 《ISA transactions》2010,49(4):543-551
In this paper, we propose a new auto-tuning fuzzy PD and PI controllers using reinforcement Q-learning (QL) algorithm for SISO (single-input single-output) and TITO (two-input two-output) systems. We first, investigate the design parameters and settings of a typical class of Fuzzy PD (FPD) and Fuzzy PI (FPI) controllers: zero-order Takagi–Sugeno controllers with equidistant triangular membership functions for inputs, equidistant singleton membership functions for output, Larsen’s implication method, and average sum defuzzification method. Secondly, the analytical structures of these typical fuzzy PD and PI controllers are compared to their classical counterpart PD and PI controllers. Finally, the effectiveness of the proposed method is proven through simulation examples. 相似文献
6.
5-Axis tool path smoothing based on drive constraints 总被引:3,自引:0,他引:3
Xavier Beudaert Pierre-Yves Pechard Christophe Tournier 《International Journal of Machine Tools and Manufacture》2011,51(12):958-965
In high speed machining, the real feedrate is often lower than the programmed one. This reduction of the feedrate is mainly due to the physical limits of the drives, and affects machining time as well as the quality of the machined surface. Indeed, if the tool path presents sharp geometrical variations the feedrate has to be decreased to respect the drive constraints in terms of velocity, acceleration and jerk. Thus, the aim of this paper is to smooth 5-axis tool paths in order to maximize the real feedrate and to reduce the machining time.Velocity, acceleration and jerk limits of each drive allow to compute an evaluation of the maximum reachable feedrate which is then used to localize the areas where the tool path has to be smoothed. So starting from a given tool path, the proposed algorithm iteratively smoothes the joint motions in order to raise the real feedrate. This algorithm has been tested in 5-axis end milling of an airfoil and in flank milling of an impeller for which a N-buffer algorithm is used to control the geometrical deviations. An important reduction of the measured machining time is demonstrated in both examples. 相似文献
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DANO Christophe 《中国科学:信息科学(英文版)》2011,(8)
A particle breakage has a significant impact on the mechanical behavior of granular materials. In this paper, we present an elasto-plastic model with two yield surfaces to which the influence of particle breakage has been introduced. The main feature of this model is to incorporate the change in the critical state line (CSL) consequent to the grain breakage induced by isotropic and deviatoric stresses during loading. For this purpose we propose a breakage function which connects the evolution of the CSL to ... 相似文献
8.
Emilia PǎunescuLudivine Louise Ludovic Jean Anthony Romieu Pierre-Yves Renard 《Dyes and Pigments》2011,91(3):427-434
A versatile methodology for the synthesis of 6/8-halogenated 7-aminocoumarins from the corresponding 7-hydroxy analogs using Pd-catalyzed amination reaction as the key step is presented. Further readily conversion into 7-azidocoumarins was performed and the resulting aryl azides proved higher stability and reactivity than the corresponding non-halogenated parent compound. These new compounds may thus constitute attractive scaffolds for designing novel photoaffinity reagents for various challenging bio-labeling applications. 相似文献
9.
Dr. Pierre-Yves Geant Dr. Malika Kaci Dr. Jean-Pierre Uttaro Prof. Christian Périgaud Prof. Christophe Mathé 《ChemMedChem》2019,14(5):522-526
The synthesis and anti-HIV evaluation of hitherto unknown 3′-fluoro-5′-norcarbocyclic nucleoside phosphonates bearing adenine with modifications at the 4′ position (ethynyl, vinyl, ethyl, hydroxymethyl) is described. One of the synthesized compounds was found to be an inhibitor of HIV-1 replication, but with moderate efficiency relative to (R)-9-(2-phosphonylmethoxypropyl)adenine ((R)-PMPA, tenofovir), with no concomitant cytotoxicity. 相似文献
10.
Laurent Ferier Jean-Franois Raskin Pierre-Yves Schobbens 《Electronic Notes in Theoretical Computer Science》2001,23(2)
We present first the logic mtl, a real-time temporal logic that is at the heart of the real-time specification language Albert. Since this logic is undecidable, we approximate it (using the theory of Abstract Interpretation) by its fictitious clock counterpart, MTLfc.We then present a symbolic tableau-based model generation decision procedure in ECLFC, which is theoretically optimal. In practice however, we see that the introduction of integer-valued prophecy variables will make it more efficient. From these variables, we reconstruct by reverting the process a logic that we call ExpSpace, which can be decided in PSpace, and has the same expressivity as MTLfc. Theory thus shows that memory space is the critical factor. However, the classical compaction of memory space by BDDs is not ideal here, since our integer variables would need to be encoded by booleans. Therefore, we use Sharing Trees instead, a compact data structure that can accommodate arbitrary data types. Preliminary results on this implementation are reported. 相似文献