prof. dr hab. inż. Bogdan Raniecki


Doktorat
1965Płaskie i kuliste termiczne fale naprężeń w ośrodku sprężysto-plastycznym 
promotor -- prof. dr hab. inż. Sylwester Kaliski, IPPT PAN
104 
Habilitacja
1978Zagadnienia stosowanej termoplastyczności 
Profesura
1987Nadanie tytułu naukowego profesora
Promotor prac doktorskich
1.1996Ziółkowski Andrzej  Zagadnienia pseudosprężystości materiałów z pamięcią kształtu 
2.1986Podgórski Jerzy  Stany krytyczne w ciałach z tarciem wewnętrznym 
3.1981Śloderbach Zdzisław  Kryteria rozdwojenia stanów równowagi w uogólnionej termoplastyczności 
4.1979-09-21Woelke Jerzy  Teoretyczna analiza naprężeń hartowniczych w stalowych płytach 
5.1975-01-29Kowalski Stefan  Zagadnienie dynamicznego kontaktu w układzie pręt - belka z uwzględnieniem plastyczności pręta 

Ostatnie publikacje
1.Raniecki B., Nguyen H.V., Mechanics of isotropic elastic-plastic flow in pressure-sensitive damaging bodies under finite strains – revisited, ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK, ISSN: 0044-2267, DOI: 10.1002/zamm.200900398, Vol.90, No.9, pp.682-700, 201020p.
2.Raniecki B., Mróz Z., Yield or martensitic phase transformation conditions and dissipation functions for isotropic, pressure-insensitive alloys exhibiting SD effect, ACTA MECHANICA, ISSN: 0001-5970, DOI: 10.1007/s00707-007-0544-7, Vol.195, pp.81-102, 2008

Streszczenie:

A class of nonsingular yield conditions depending on three parameters is analyzed for isotropic materials exhibiting strength differential effect and pressure insensitivity. The yield condition can then be expressed in terms of the second and third stress deviator invariants. The convexity requirement is considered and the constraints imposed on the material parameters are discussed in detail. The dual dissipation function is derived in the analytical form. The condition can be applied in the analysis of high strength alloys (such as Inconnel 718) or of shape memory alloys (such as NiTi, NiAl, CuZnGa, or CuAlNi) in order to specify the onset of yield, or of martensitic or austenitic transformation. The conditions can easily be generalized to account for mixed hardening and back stress anisotropy. Some experimental data are provided to verify the proposed conditions.

Afiliacje autorów:

Raniecki B.-IPPT PAN
Mróz Z.-IPPT PAN
3.Raniecki B., Nguyen H.V., Ziółkowski A., On the incremental plastic work and related aspects of invariance - Part 2, ACTA MECHANICA, ISSN: 0001-5970, DOI: 10.1007/s00707-007-0535-8, Vol.200, pp.79-109, 2008

Streszczenie:

Presuming that the incremental free energy is invariant under a change of the Lagrangean finite strain measure and/or the reference configuration Hill’s transformation rules for the basic quantities occurring in mechanics of elastic–plastic solids are recasted in general 3D situation. On this background the invariant incremental plastic work is defined. The basic connections between Hill–Rice theoretical framework and Eckart–Mandel approach, involving the mobile stress-free configuration, are discussed both in generalized coordinates and in the tensorial notation. To this end the selected fundamentals of solid mechanics including the work-conjugacy are recalled. The structure of the updated Lagrangean plastic increment of the total strain is exhibited accounting for the deformation and stress effects due to possible damage and pressure sensitivity of a solid. Special simple approximate relations are derived for the situations when non-dilatational elastic strains are small. The merits of using the logarithmic elastic strain as a state variable are also discussed.

Afiliacje autorów:

Raniecki B.-IPPT PAN
Nguyen H.V.-other affiliation
Ziółkowski A.-IPPT PAN
4.Nguyen H.V., Raniecki B., Ziółkowski A., On the incremental plastic work and related aspects of invariance - Part 1, ACTA MECHANICA, ISSN: 0001-5970, DOI: 10.1007/s00707-006-0406-8, Vol.189, pp.1-22, 2007

Streszczenie:

Taking for granted that the free energy function is invariant under a change of a finite strain measure and/or the reference configuration, Hill's transformation rules for selected fundamental constitutive quantities (such as tangent elastic modulus, plastic increments of total strain and work conjugate stress, the work of work-conjugate stress, the work expended in the plastic part of incremental strain etc.) are derived in a manner different from that of Hill. On this background distinguished by Hill [6] subtle aspects of invariance in mechanics of elastic plastic solids are discussed. It is shown that the plastic part of the increment of elastic strain energy (when taken with reverse sign) defines the true invariant incremental plastic work which in general is not equal to the work expended in the plastic part of the strain increment. It plays the role of a potential for the plastic part of the increment of work-conjugate stress. This fundamental fact has not found proper account in the literature. The analytical interrelations between two apparently different theoretical frameworks, Hill-Rice (fixed reference configuration) and Eckart-Mandel (mobile unloaded configuration) are discussed showing their equivalence. Since the transformation rules are complex in the general 3D case, the first part of the paper illustrates instructively the discussed aspects in a 1D situation (simple tension or simple extension).

Afiliacje autorów:

Nguyen H.V.-other affiliation
Raniecki B.-IPPT PAN
Ziółkowski A.-IPPT PAN
5.Raniecki B., Śloderbach Z., Wiktorow W.W., Własności mechaniczych metali przy krótkotrwałych obciążeniach w warunkach zmiennych temperatur, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.68, pp.1-44, 1979
6.Raniecki B., Zagadnienia stosowanej termoplastyczności (Praca habilitacyjna), Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.29, pp.1-115, 1977
7.Mróz Z., Raniecki B., A derivation of the uniqueness conditions in coupled thermoplasticity, International Journal of Engineering Science, ISSN: 0020-7225, DOI: 10.1016/0020-7225(76)90012-4, Vol.14, No.4, pp.395-401, 1976

Streszczenie:

This article presents the proof of local and global uniqueness conditions in rate independent coupled thermoplasticity. The mathematical structure of rate equations which account for all coupling effects was discussed in [1] where uniqueness conditions were stated without proof and discussed for some particular cases.

Afiliacje autorów:

Mróz Z.-IPPT PAN
Raniecki B.-IPPT PAN
8.Mróz Z., Raniecki B., On the uniqueness problem in coupled thermoplasticity, International Journal of Engineering Science, ISSN: 0020-7225, DOI: 10.1016/0020-7225(76)90090-2, Vol.14, No.2, pp.211-221, 1976

Streszczenie:

Rate equations of coupled thermoplasticity are derived assuming that the total strain rate is composed of elastic and plastic terms and accounting for coupling effects such as heat of dissipation, piezocaloric effect, in both mechanical and temperature equations. Local and global uniqueness conditions are presented and its engineering significance is discussed.

Afiliacje autorów:

Mróz Z.-IPPT PAN
Raniecki B.-IPPT PAN
9.Mróz Z., Raniecki B., Variational principles in uncoupled thermoplasticity, International Journal of Engineering Science, ISSN: 0020-7225, DOI: 10.1016/0020-7225(73)90080-3, Vol.11, No.11, pp.1133-1141, 1973

Streszczenie:

Stress-rate and strain-rate variational principles are derived for a viscoplastic material characterized by additive elastic and inelastic strain rates. Elastic, viscous and plastic properties are assumed to be temperature dependent but all coupling effects are neglected.

Afiliacje autorów:

Mróz Z.-IPPT PAN
Raniecki B.-IPPT PAN
10.Raniecki B., O zasadach ekstremalnych w niesprzężonej termoplastyczności, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.48, pp.1-12, 1972
11.Raniecki B., O zderzeniu zimnej płyty sprężystej z gorącą płytą sprężysto-plastyczną, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.27, pp.1-25, 1971
12.Nowacki W.K., Raniecki B., Uwagi dotyczące rozwiązań pewnych zagadnień dynamicznych termo-lepkosprężystości, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.28, pp.1-17, 1967