27 research outputs found

    Efficient fe strategies for springback prediction – material modelling and computational aspects

    Get PDF
    Blanks of sheet metal are characterized by an intrinsic plastic anisotropic behaviour resulting from the plastic deformation during the rolling of sheets. Another type of anisotropy is elastic anisotropy which might be essential especially during elastic recovery processes during unloading after forming and springback. Thus, this paper focuses on the study of the sensitivity of the amount of springback in unconstrained bending with respect to elastic anisotropy. A finite strain constitutive model for evolving elastic and plastic anisotropy combining nonlinear isotropic and kinematic hardening is discussed. The evolution of elastic anisotropy is described by representing the Helmholtz free energy as a function of a family of evolving structure tensors. In addition, plastic anisotropy is modelled via the dependence of the yield surface on the same family of structure tensors. The constitutive equations of the model are implemented as a user material subroutine UMAT in the commercial solver ABAQUS/Standard, which is then applied to the simulation of springback in unconstrained bending

    Π€Π΅Ρ€Ρ€ΠΎΠΌΠ°Π³Π½ΠΈΡ‚Π½Ρ‹ΠΉ Ρ†ΠΈΠ»ΠΈΠ½Π΄Ρ€ Π² Ρ‰Π΅Π»Π΅Π²ΠΎΠΌ Π²ΠΈΡ…Ρ€Π΅Ρ‚ΠΎΠΊΠΎΠ²ΠΎΠΌ ΠΏΡ€Π΅ΠΎΠ±Ρ€Π°Π·ΠΎΠ²Π°Ρ‚Π΅Π»Π΅

    Get PDF
    Выводится аналитичСскоС Π²Ρ‹Ρ€Π°ΠΆΠ΅Π½ΠΈΠ΅ для Π½ΠΎΡ€ΠΌΠΈΡ€ΠΎΠ²Π°Π½Π½ΠΎΠΉ э. Π΄. с. ΠΈΠ·ΠΌΠ΅Ρ€ΠΈΡ‚Π΅Π»ΡŒΠ½ΠΎΠΉ ΠΎΠ±ΠΌΠΎΡ‚ΠΊΠΈ Π² Π²ΠΈΠ΄Π΅ ΠΏΡ€ΡΠΌΠΎΡƒΠ³ΠΎΠ»ΡŒΠ½ΠΎΠΉ Ρ€Π°ΠΌΠΊΠΈ, располоТСнной Π½Π° Ρ‚ΠΎΡ€Ρ†Π°Ρ… полюсов ΠΌΠ°Π³Π½ΠΈΡ‚ΠΎΠΏΡ€ΠΎΠ²ΠΎΠ΄Π° Ρ‰Π΅Π»Π΅Π²ΠΎΠ³ΠΎ Π²ΠΈΡ…Ρ€Π΅Ρ‚ΠΎΠΊΠΎΠ²ΠΎΠ³ΠΎ прСобразоватСля. ΠŸΠΎΠΊΠ°Π·Π°Π½Ρ‹ Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Ρ‹ расчСта аналитичСских Π²Ρ‹Ρ€Π°ΠΆΠ΅Π½ΠΈΠΉ с ΠΏΠΎΠΌΠΎΡ‰ΡŒΡŽ Π­Π¦Π’Πœ Π² Π²ΠΈΠ΄Π΅ Π³ΠΎΠ΄ΠΎΠ³Ρ€Π°Ρ„ΠΎΠ² эффСктивной ΠΌΠ°Π³Π½ΠΈΡ‚Π½ΠΎΠΉ проницаСмости ΠΈ Π½ΠΎΡ€ΠΌΠΈΡ€ΠΎΠ²Π°Π½Π½Ρ‹Ρ… привнСсСнных э. Π΄. с. Π Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Ρ‹ тСорСтичСских исслСдований ΡΡ€Π°Π²Π½ΠΈΠ²Π°ΡŽΡ‚ΡΡ с ΡΠΊΡΠΏΠ΅Ρ€ΠΈΠΌΠ΅Π½Ρ‚Π°Π»ΡŒΠ½Ρ‹ΠΌΠΈ Π΄Π°Π½Π½Ρ‹ΠΌΠΈ

    Π Π°Π·Ρ€Π°Π±ΠΎΡ‚ΠΊΠΈ Ρ‚Π΅Ρ…Π½ΠΎΠ»ΠΎΠ³ΠΈΠΈ сборки ΠΈ сварки ΠΌΠ°Π³ΠΈΡΡ‚Ρ€Π°Π»ΡŒΠ½ΠΎΠ³ΠΎ Π½Π΅Ρ„Ρ‚Π΅ΠΏΡ€ΠΎΠ²ΠΎΠ΄Π° ΠΈΠ· Ρ‚Ρ€ΡƒΠ± Π΄ΠΈΠ°ΠΌΠ΅Ρ‚Ρ€ΠΎΠΌ 1020 ΠΌΠΌ

    Get PDF
    Π’ процСссС выполнСния Ρ€Π°Π±ΠΎΡ‚ ΠΏΡ€ΠΎΠ²ΠΎΠ΄ΠΈΠ»ΠΈΡΡŒ ΠΈΠ·ΡƒΡ‡Π΅Π½ΠΈΠ΅ составных Π΄Π΅Ρ‚Π°Π»Π΅ΠΉ издСлия, описаниС ΠΌΠ°Ρ€ΠΊΠΈ стали, Π²Ρ‹Π±ΠΎΡ€ ΠΌΠ΅Ρ‚ΠΎΠ΄Π° сварки, Π²Ρ‹Π±ΠΎΡ€ сварочных ΠΌΠ°Ρ‚Π΅Ρ€ΠΈΠ°Π»ΠΎΠ², Π½ΠΎΡ€ΠΌΠΈΡ€ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΎΠΏΠ΅Ρ€Π°Ρ†ΠΈΠΉ, составлСниС тСхнологичСских ΠΊΠ°Ρ€Ρ‚. Π’ Ρ€Π΅Π·ΡƒΠ»ΡŒΡ‚Π°Ρ‚Π΅ выполнСния Ρ€Π°Π±ΠΎΡ‚ рассчитаны Ρ€Π΅ΠΆΠΈΠΌΡ‹ сварки, ΠΏΠΎΠ΄ΠΎΠ±Ρ€Π°Π½ΠΎ сварочноС ΠΎΠ±ΠΎΡ€ΡƒΠ΄ΠΎΠ²Π°Π½ΠΈΠ΅, ΠΏΡ€ΠΎΠ½ΠΎΡ€ΠΌΠΈΡ€ΠΎΠ²Π°Π½Ρ‹ сборочно-сварочныС ΠΎΠΏΠ΅Ρ€Π°Ρ†ΠΈΠΈ. ΠŸΠΎΡΡ‡ΠΈΡ‚Π°Π½ коэффициСнт ΠΏΡ€ΠΈΠ²Π΅Π΄Π΅Π½Π½Ρ‹Ρ… Π·Π°Ρ‚Ρ€Π°Ρ‚.In the process of performing the work, the study of the component parts of the product, the description of the steel grade, the choice of the welding method, the choice of welding materials, the standardization of operations, and the preparation of technological maps were carried out

    St. John's Daily Star, 1921-02-02

    No full text
    The St. John's Daily Star was published daily except Sunday between 17 April 1915 - 23 July 1921
    corecore