972 research outputs found
Numerical modeling of large elastoplastic strains in terms of principal stretches. II. Physical relations, calculation algorithm
The constitutive relations and plastic flow rule are derived from the thermodynamics equations. The known procedures of determining the plastic strain rate value are described. A calculation algorithm is presented that is based on the incremental loading, linearization of the virtual power equation and the projection method. A numerical example is presented. Β© 2010 Allerton Press, Inc
Finite strains: Objective rates, conjugate stress tensors, constitutive equations for composite materials
Theoretical problems of the kinematics of continuum under the conditions of finite strains are considered; the technique for development of constitutive equations for isotropic and composite hyperelastic media is presented. A system of principal directions of the left and right tensors of distortions that determine material (Lagrangian) and spatial (Eulerian) tensors are taken as a basis. Such an approach allows construction of stress tensors conjugate to any strain tensor which is demonstrated by a number of examples. 2152-2057/10/$35.00Β©2010 by Begell House, Inc
Numerical modeling of large elastoplastic strains in terms of principal stretches. I. kinematics of elastoplastic strains
A technique for numerical finite element analysis of large elastoplastic strains is proposed. A problem is formulated in terms of principal stretches and their logarithms in the current basis of the left distortion tensor. It is shown that the "classical" multiplicative decomposition of the total strain gradient into the product of elastic and plastic strain gradients is equivalent to the presentation of total stretches as a product of elastic and plastic stretches. Β© Allerton Press, Inc., 2010
Algorithmic means implementing requirements reliability entering information into the onboard control computing system in rocket "SOYUZ-2"
Π Π°ΡΡΠΌΠΎΡΡΠ΅Π½Ρ ΠΏΡΠ΅Π΄ΡΡΠ²Π»ΡΠ΅ΠΌΡΠ΅ ΡΡΠ΅Π±ΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎ Π½Π°Π΄Π΅ΠΆΠ½ΠΎΡΡΠΈ ΠΊ ΡΠ΅ΠΆΠΈΠΌΡ Π²Π²ΠΎΠ΄Π° ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠ½ΠΎΠ³ΠΎ ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠ΅Π½ΠΈΡ Π² Π±ΠΎΡΡΠΎΠ²ΡΡ ΡΠΈΡΡΠΎΠ²ΡΡ Π²ΡΡΠΈΡΠ»ΠΈΡΠ΅Π»ΡΠ½ΡΡ ΡΠΈΡΡΠ΅ΠΌΡ ΡΠ°ΠΊΠ΅ΡΡ-Π½ΠΎΡΠΈΡΠ΅Π»Ρ Β«Π‘ΠΎΡΠ·-2Β». ΠΡΠΎΠΈΠ·Π²Π΅Π΄Π΅Π½ Π°Π½Π°Π»ΠΈΠ· ΡΡΡΠ΅ΡΡΠ²ΡΡΡΠΈΡ
ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠ½ΠΎ-Π°Π»Π³ΠΎΡΠΈΡΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΡΠ΅Π΄ΡΡΠ² ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠ΅Π½ΠΈΡ ΠΏΡΠ΅Π΄ΡΡΠ²Π»Π΅Π½Π½ΡΡ
ΡΡΠ΅Π±ΠΎΠ²Π°Π½ΠΈΠΉ ΠΏΠΎ Π½Π°Π΄Π΅ΠΆΠ½ΠΎΡΡΠΈ. ΠΠ·-Π·Π° Π±ΠΎΠ»ΡΡΠΎΠ³ΠΎ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²Π° ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΠ΅ΠΌΡΡ
ΡΠ»Π΅ΠΌΠ΅Π½ΡΠΎΠ² ΠΈ Π²ΠΎΠ·ΡΠ°ΡΡΠ°Π½ΠΈΡ ΠΎΠ±ΡΠ΅ΠΌΠΎΠ² Ρ
ΡΠ°Π½ΠΈΠΌΠΎΠΉ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ Π²ΠΎΠ·Π½ΠΈΠΊΠ°Π΅Ρ ΡΡΠ΄ ΠΏΡΠΎΠ±Π»Π΅ΠΌ ΡΠ²ΡΠ·Π°Π½Π½ΡΡ
Ρ ΡΠ΅Π°Π»ΠΈΠ·Π°ΡΠΈΠ΅ΠΉ Π½Π°Π΄Π΅ΠΆΠ½ΠΎΠ³ΠΎ Π²Π²ΠΎΠ΄Π°. ΠΡΠ½ΠΎΠ²Π½ΡΠ΅ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠ°ΠΌΠΈ Π² Π΄Π°Π½Π½ΠΎΠΌ ΡΠ΅ΠΆΠΈΠΌΠ΅ ΡΡΠΎ Π±ΠΎΠ»ΡΡΠ°Ρ Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΡ Π²ΠΎΠ·Π½ΠΈΠΊΠ½ΠΎΠ²Π΅Π½ΠΈΡ Π΄Π²ΡΡ
ΠΊΡΠ°ΡΠ½ΡΡ
ΠΈΡΠΊΠ°ΠΆΠ΅Π½ΠΈΠΉ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ ΠΈ Π²Π½Π΅ΡΠ½Π΅Π΅ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ Π½Π° Π»ΠΈΠ½ΠΈΠΈ ΡΠ²ΡΠ·ΠΈ. Π ΡΠ²ΡΠ·ΠΈ Ρ ΡΡΠΈΠΌ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ Π΄ΠΎΡΠ°Π±ΠΎΡΠ°Π½Π½ΡΠ΅ ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠ½ΠΎ-Π°Π»Π³ΠΎΡΠΈΡΠΌΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΡΠ΅Π΄ΡΡΠ²Π° ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠ΅Π½ΠΈΡ Π½Π°Π΄Π΅ΠΆΠ½ΠΎΡΡΠΈ ΡΠ΅ΠΆΠΈΠΌΠ° Π²Π²ΠΎΠ΄Π° ΠΏΡΠΎΠ³ΡΠ°ΠΌΠΌΠ½ΠΎΠ³ΠΎ ΠΎΠ±Π΅ΡΠΏΠ΅ΡΠ΅Π½ΠΈΡ, Ρ ΡΡΠ΅ΡΠΎΠΌ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠ΅ΠΉ ΠΈ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΠ΅ΠΉ Π±ΠΎΡΡΠΎΠ²ΠΎΠΉ ΡΠΈΡΡΠΎΠ²ΠΎΠΉ Π²ΡΡΠΈΡΠ»ΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ ΡΠ°ΠΊΠ΅ΡΡ-Π½ΠΎΡΠΈΡΠ΅Π»Ρ Β«Π‘ΠΎΡΠ·-2Β», ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎ ΠΏΠΎΠ²ΡΡΠΈΠ²ΡΠΈΠ΅ Π½Π°Π΄Π΅ΠΆΠ½ΠΎΡΡΡ ΡΠ΅ΠΆΠΈΠΌΠ° Π²Π²ΠΎΠ΄Π° ΠΈ ΡΠΈΡΡΠ΅ΠΌΡ Π² ΡΠ΅Π»ΠΎΠΌ.Discussed requirements to in terms of reliability to the input mode software onboard digital computer system rocket "Soyuz-2". The analysis of existing software and algorithmic means to ensure demand under reliability. Due to the large number of elements used and increasing volumes of stored information, a number of problems associated with the implementation of a reliable input. The main problem in this mode is a large probability of two multiple misstatements and external influence on the link. In this regard, presented the modified software and algorithmic means of securing the input mode information, taking into account the characteristics and capabilities of the onboard digital computer system carrier rocket "Soyuz-2", will significantly increase the reliability of the input mode and the system as a whole
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