The Experts below are selected from a list of 27528 Experts worldwide ranked by ideXlab platform

A. Kazakov - One of the best experts on this subject based on the ideXlab platform.

  • An automated method for the measurement of residual stress in melt-extruded plastic pipes
    Polymer Testing, 1998
    Co-Authors: A. Kazakov
    Abstract:

    The residual stress in an isotropic plastic pipe is an inherent characteristic of the Conventional Manufacturing Process via melt extrusion and subsequent rapid cooling. This paper describes an automated test method developed for the measurement of residual stress in a MDPE/HDPE pipe. It is based on the concept of monitoring the deflection of an axially slit pipe ring as a function of time. The slit ring creeps in a typical time dependent viscoelastic fashion. The four parameter Voigt model is employed to characterize such behavior and to calculate the creep parameters including the average through-wall resultant stress. A comparative study of the residual stresses in MDPE pipe samples produced under different Processing conditions was conducted and its results demonstrate the relationship between the severity of treatment of the molten polymer and the level of residual stress in the end use product.

Jan C. Aurich - One of the best experts on this subject based on the ideXlab platform.

  • Functional investigation of zero lead radial shaft seal counter-surfaces turned with a special method
    Tribology International, 2018
    Co-Authors: Stefan Thielen, Balázs Magyar, Bernd Sauer, Frank Schneider, Patrick Mayer, Benjamin Kirsch, Ralf Müller, Erik Von Harbou, Jan C. Aurich
    Abstract:

    The sealing capabilities of RSS do not only depend on the seal itself but also on the lubricant and the shaft surface. A twist structure on the surface can cause pumping of the fluid during shaft rotation which can result in leakage. In this paper a special, new turning method, which consists of at least two turning steps with feed in reciprocal direction, is presented as an alternative to the Conventional Manufacturing Process. The goal is to create a surface structure with a net pumping rate of zero. Shafts turned with the new proposed method are compared to turned shafts from previous investigations [1]. Criteria for the comparison are the surface pumping rate, leakage and wear behavior of the surface.

Mounir Baccar - One of the best experts on this subject based on the ideXlab platform.

  • conformal heating cooling channels design in rapid heat cycle molding Process
    Mechanics & Industry, 2017
    Co-Authors: Fatma Kria, Moez Hammami, Mounir Baccar
    Abstract:

    A three-dimensional study of the thermal regulation system of Rapid Heat Cycle Molding Process producing complex-shaped automotive part was undertaken. This numerical study aims at improving the design of thermal control system so as to improve the quality of the molded part and the Process productivity. The thermal responses in mold and cavity are predicted by the commercial Finite Volume Analysis software Fluent 6.3.26 in cyclic transient regime. It was shown that a regular regime is established from the second molding cycle. Besides, the three dimensional thermal responses have shown the limitations of the classic conformal design in terms of temperature uniformity and cycle time for the complex shaped automotive part. Hence, and based on Conventional Manufacturing Process, the efficiency of a new conformal design has been shown. In fact, simple drillings coupled with concentric tubes are able to produce complicated conformal heating/cooling channels, which are easier to fabricate, assemble and which have low manufacture cost compared with other methods. By this proposed new conformal design, we could greatly reduce the cycle time, temperature gap and energy consumption.

  • Conformal heating/cooling channels design in rapid heat cycle molding Process
    Mechanics & Industry, 2016
    Co-Authors: Fatma Kria, Moez Hammami, Mounir Baccar
    Abstract:

    A three-dimensional study of the thermal regulation system of Rapid Heat Cycle Molding Process producing complex-shaped automotive part was undertaken. This numerical study aims at improving the design of thermal control system so as to improve the quality of the molded part and the Process productivity. The thermal responses in mold and cavity are predicted by the commercial Finite Volume Analysis software Fluent 6.3.26 in cyclic transient regime. It was shown that a regular regime is established from the second molding cycle. Besides, the three dimensional thermal responses have shown the limitations of the classic conformal design in terms of temperature uniformity and cycle time for the complex shaped automotive part. Hence, and based on Conventional Manufacturing Process, the efficiency of a new conformal design has been shown. In fact, simple drillings coupled with concentric tubes are able to produce complicated conformal heating/cooling channels, which are easier to fabricate, assemble and which have low manufacture cost compared with other methods. By this proposed new conformal design, we could greatly reduce the cycle time, temperature gap and energy consumption.

Ou Tang - One of the best experts on this subject based on the ideXlab platform.

  • (18th ICPR) Optimal Production Opportunities in a ReManufacturing System
    International Journal of Production Research, 2006
    Co-Authors: Robert W Grubbstrom, Ou Tang
    Abstract:

    In recent years, reManufacturing has emerged in various industrial sectors and it In recent years, reManufacturing has emerged in various industrial sectors and it adds an additional production alternative apart from the Conventional Manufacturing Process. With reManufacturing, a used return product is often disassembled, reProcessed and then reassembled into a new product. The remanufactured product is often of the same quality as those from regular Manufacturing. Even though reManufacturing saves a substantial cost of materials, it often requires more labour and other inputs. Thus it becomes important to examine the expanded production opportunity of the system. In this paper we therefore make a first attempt to model such a system with respect to its optimal production. This model is based on the Cobb-Douglas (Wicksell) production function. More specifically, we focus on how labour costs, material costs and the budget influence optimal production decisions. Explicit properties of the optimal plan are derived and presented as theorems. Results of this study are intended to provide a guideline for managers to make sound decisions, when dealing with the increasingly important reManufacturing systems.

Dongseok Kang - One of the best experts on this subject based on the ideXlab platform.

  • multi lattice inner structures for high strength and light weight in metal selective laser melting Process
    Materials & Design, 2019
    Co-Authors: Dongseok Kang, Sanghu Park, Simo Yeon
    Abstract:

    Abstract Due to the development of additive Manufacturing (AM), lattice structure which cannot be fabricated by the Conventional Manufacturing Process or have shape restriction has attracted much attention. We propose a new lightweight design method using two types of lattice structures considering the manufacturability in the metal selective laser melting (SLM) and structural characteristics. Firstly, the specific procedure for the proposed design method is presented. In order to apply the two lattice structures, relative density criterion is derived by fabricating experiments using metal SLM Process and analyzing geometry according to relative density. The optimal relative density distribution is calculated by performing the topology optimization with minimum relative density using a commercial software package. This proposed method is computationally and experimentally validated by a three-point bending test. Simultaneously, the same procedure is applied to uniform lattice for comparison with the proposed method. This proposed design has a 46% increase in stiffness, a relative flexural rigidity of 35% compared to the solid material, and has a deformation mode different from the uniform lattice. This design sets the standard for using two lattice structures and gives a new perspective on lightweight design with lattice structures.