27 research outputs found
Efficient fe strategies for springback prediction β material modelling and computational aspects
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 ο¬nite 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΅ΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΡΠΉ ΡΠΈΠ»ΠΈΠ½Π΄Ρ Π² ΡΠ΅Π»Π΅Π²ΠΎΠΌ Π²ΠΈΡ ΡΠ΅ΡΠΎΠΊΠΎΠ²ΠΎΠΌ ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°ΡΠ΅Π»Π΅
ΠΡΠ²ΠΎΠ΄ΠΈΡΡΡ Π°Π½Π°Π»ΠΈΡΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π²ΡΡΠ°ΠΆΠ΅Π½ΠΈΠ΅ Π΄Π»Ρ Π½ΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ Ρ. Π΄. Ρ. ΠΈΠ·ΠΌΠ΅ΡΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ ΠΎΠ±ΠΌΠΎΡΠΊΠΈ Π² Π²ΠΈΠ΄Π΅ ΠΏΡΡΠΌΠΎΡΠ³ΠΎΠ»ΡΠ½ΠΎΠΉ ΡΠ°ΠΌΠΊΠΈ, ΡΠ°ΡΠΏΠΎΠ»ΠΎΠΆΠ΅Π½Π½ΠΎΠΉ Π½Π° ΡΠΎΡΡΠ°Ρ
ΠΏΠΎΠ»ΡΡΠΎΠ² ΠΌΠ°Π³Π½ΠΈΡΠΎΠΏΡΠΎΠ²ΠΎΠ΄Π° ΡΠ΅Π»Π΅Π²ΠΎΠ³ΠΎ Π²ΠΈΡ
ΡΠ΅ΡΠΎΠΊΠΎΠ²ΠΎΠ³ΠΎ ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°ΡΠ΅Π»Ρ. ΠΠΎΠΊΠ°Π·Π°Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΡΠ°ΡΡΠ΅ΡΠ° Π°Π½Π°Π»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π²ΡΡΠ°ΠΆΠ΅Π½ΠΈΠΉ Ρ ΠΏΠΎΠΌΠΎΡΡΡ ΠΠ¦ΠΠ Π² Π²ΠΈΠ΄Π΅ Π³ΠΎΠ΄ΠΎΠ³ΡΠ°ΡΠΎΠ² ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΠΉ ΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠΉ ΠΏΡΠΎΠ½ΠΈΡΠ°Π΅ΠΌΠΎΡΡΠΈ ΠΈ Π½ΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΡΡ
ΠΏΡΠΈΠ²Π½Π΅ΡΠ΅Π½Π½ΡΡ
Ρ. Π΄. Ρ. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ ΡΠ΅ΠΎΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΡΡΠ°Π²Π½ΠΈΠ²Π°ΡΡΡΡ Ρ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΠΌΠΈ Π΄Π°Π½Π½ΡΠΌΠΈ
Π Π°Π·ΡΠ°Π±ΠΎΡΠΊΠΈ ΡΠ΅Ρ Π½ΠΎΠ»ΠΎΠ³ΠΈΠΈ ΡΠ±ΠΎΡΠΊΠΈ ΠΈ ΡΠ²Π°ΡΠΊΠΈ ΠΌΠ°Π³ΠΈΡΡΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ Π½Π΅ΡΡΠ΅ΠΏΡΠΎΠ²ΠΎΠ΄Π° ΠΈΠ· ΡΡΡΠ± Π΄ΠΈΠ°ΠΌΠ΅ΡΡΠΎΠΌ 1020 ΠΌΠΌ
Π ΠΏΡΠΎΡΠ΅ΡΡΠ΅ Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΡ ΡΠ°Π±ΠΎΡ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΠΈΡΡ ΠΈΠ·ΡΡΠ΅Π½ΠΈΠ΅ ΡΠΎΡΡΠ°Π²Π½ΡΡ
Π΄Π΅ΡΠ°Π»Π΅ΠΉ ΠΈΠ·Π΄Π΅Π»ΠΈΡ, ΠΎΠΏΠΈΡΠ°Π½ΠΈΠ΅ ΠΌΠ°ΡΠΊΠΈ ΡΡΠ°Π»ΠΈ, Π²ΡΠ±ΠΎΡ ΠΌΠ΅ΡΠΎΠ΄Π° ΡΠ²Π°ΡΠΊΠΈ, Π²ΡΠ±ΠΎΡ ΡΠ²Π°ΡΠΎΡΠ½ΡΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ², Π½ΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΉ, ΡΠΎΡΡΠ°Π²Π»Π΅Π½ΠΈΠ΅ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΊΠ°ΡΡ.
Π ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ΅ Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΡ ΡΠ°Π±ΠΎΡ ΡΠ°ΡΡΡΠΈΡΠ°Π½Ρ ΡΠ΅ΠΆΠΈΠΌΡ ΡΠ²Π°ΡΠΊΠΈ, ΠΏΠΎΠ΄ΠΎΠ±ΡΠ°Π½ΠΎ ΡΠ²Π°ΡΠΎΡΠ½ΠΎΠ΅ ΠΎΠ±ΠΎΡΡΠ΄ΠΎΠ²Π°Π½ΠΈΠ΅, ΠΏΡΠΎΠ½ΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½Ρ ΡΠ±ΠΎΡΠΎΡΠ½ΠΎ-ΡΠ²Π°ΡΠΎΡΠ½ΡΠ΅ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ. ΠΠΎΡΡΠΈΡΠ°Π½ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½Ρ ΠΏΡΠΈΠ²Π΅Π΄Π΅Π½Π½ΡΡ
Π·Π°ΡΡΠ°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
The St. John's Daily Star was published daily except Sunday between 17 April 1915 - 23 July 1921