→ I. D. Moldovan, T. D. Cao and J.
A. Teixeira de Freitas, Hybrid-Trefftz Elements for
Biphasic Elastostatics, International Journal of Engineering Science, under
review, 2012. [link]
→ I. D.
Moldovan and J. A. Teixeira de Freitas,
Hybrid-Trefftz displacement and stress elements for bounded poroelasticity
problems, Computers and Geotechnics, volume 42,
2012, Pages 129-144. [link]
→ J. A. Teixeira de Freitas, I. D. Moldovan and C. Cismasiu,
Hybrid-Trefftz displacement element for bounded and unbounded poroelastic media, Computational Mechanics, volume 48, 2011, Pages 659-673. [link]
→ J. A.
Teixeira de Freitas and I. D. Moldovan,
Hybrid-Trefftz stress element for bounded and unbounded poroelastic
media, International Journal for Numerical Methods in Engineering, volume 85,
2011, Pages 1280-1305. [link]
→ J. A.
Teixeira de Freitas, I. D. Moldovan and M. Toma, Mixed and hybrid stress elements for biphasic
media, Computers & Structures, volume 88, 2010, Pages 1286-1299. [link]
→ J. A. Teixeira de Freitas and M. Toma,
Hybrid-Trefftz stress and displacement elements for axisymmetric
incompressible biphasic media, Computer Methods in Applied Mechanics and
Engineering, volume 198, 2009, Pages 2368-2390. [link]
→ J. A.
Teixeira de Freitas and M. Toma,
Hybrid-Trefftz stress elements for incompressible biphasic media,
International Journal for Numerical Methods in Engineering, volume 79, 2009,
Pages 205-238. [link]
→ N.Fowkes,
J. A. Teixeira de Freitas and R. Stacey, Crack
repair using an elastic filler, Journal of the Mechanics and Physiscs of
Solids, volume 56, 2008, Pages 2749-2758. [link]
→ J. A. Teixeira de Freitas, Mixed finite element solution of time-dependent
problems, Computer Methods in Applied Mechanics and Engineering, volume 197,
2008, Pages 3657-3678. [link]
→ I. D. Moldovan and J. A. Teixeira
de Freitas, Hybrid-Trefftz stress and displacement
elements for dynamic analysis of bounded and unbounded saturated porous
media, Computer Assisted Mechanics and Engineering Sciences, volume 15, 2008,
Pages 289-303. [link]
→ I. Cismasiu and J. P. Moitinho de Almeida,
Data structures for the distributed iterative solution of non-conventional
finite element models, Advances in Engineering Software, Volume 38, 2007,
Pages 750-762. [link]
→ J. A. Teixeira de Freitas and C. Cismaşiu,
Adaptive p-refinement of hybrid-Trefftz finite element solutions, Finite
Elements in Analysis and Design, Volume 39, Issue 11, August 2003, Pages
1095-1121. [link]
→ J. A.
Teixeira de Freitas, Time integration and the Trefftz
Method Part I - First-order and parabolic problems, Computer Assisted
Mechanics and Engineering Sciences, 10: 453-463, 2003. [link]
→ J. A. Teixeira de Freitas, Time integration and the Trefftz Method Part II
- Second-order and hyperbolic problems, Computer Assisted Mechanics and
Engineering Sciences, 10: 465-477, 2003. [link]
→ J. A.
Teixeira de Freitas and C. Cismaşiu,
Hybrid-Trefftz displacement element for spectral analysis of bounded and unbounded
media, International Journal of Solids and Structures, Volume 40, Issue 3,
February 2003, Pages 671-699. [link]
→ J. A.
Teixeira de Freitas, Mixed finite element
formulation for the solution of parabolic problems, Computer Methods in
Applied Mechanics and Engineering, Volume 191, Issue 32, 7 June 2002, Pages
3425-3457. [link]
→ J. A. Teixeira de Freitas and C. Cismaşiu,
Shape optimization with hybrid-Trefftz displacement elements, International
Journal for Numerical Methods in Engineering, Volume 53, Issue 2, 20 January
2002, Pages: 473-498 [link]
→ J. A. Teixeira de Freitas and C. Cismaşiu,
Developments with hybrid-Trefftz stress and displacement elements, Computer
Assisted Mechanics and Engineering Sciences, 8: 289-311, 2001. [link]
→ F.
L. S. Bussambra, P. de Mattos Pimenta and J. A. Teixeira de Freitas,
Hybrid-Trefftz stress elements for three-dimensional elastoplasticity,
Computer Assisted Mechanics and Engineering Sciences, 8: 235-246, 2001. [link]
→ J. A.
Teixeira de Freitas and Z. M. Wang, Elastodynamic
analysis with hybrid stress finite elements, Computers & Structures,
Volume 79, Issue 19, July 2001, Pages 1753-1767. [link]
→ L. M. Santos Castro and J. A.
Teixeira de Freitas, Wavelets in hybrid-mixed
stress elements, Computer Methods in Applied Mechanics and Engineering,
Volume 190, Issue 31, 27 April 2001, Pages 3977-3998. [link]
→ J. A. Teixeira de Freitas and V. M. A. Leitão, A
boundary integral Trefftz formulation with symmetric collocation,
Computational Mechanics, Volume 25, Issue 6, June 2000, Pages 515-523. [link]
→ J. A. Teixeira de Freitas, F. L. S. Bussamra,
Three-dimensional hybrid-Trefftz stress elements, International Journal for
Numerical Methods in Engineering, Volume 47, Issue 5, Date: 20 February 2000,
Pages: 927-950. [link]
→ J. A. Teixeira de Freitas, C. Cismaşiu and
Z. M. Wang, Comparative Analysis of Hybrid-Trefftz Stress and Displacement Elements,
Archives of Computational Methods in Engineering, Volume 6, Issue 1, 1999,
Pages 35-59. [link]
→ J. A. Teixeira de Freitas and C. Cismasiu,
Numerical implementation of hybrid-Trefftz displacement elements, Computers
& Structures, Volume 73, Issues 1-5, 12 October 1999, Pages 207-225. [link]
→ J.
A. Teixeira de Freitas, J. P. Moitinho de Almeida, E. M. B. Ribeiro Pereira,
Non-conventional formulations for the finite element method, Computational
Mechanics, Volume 23, Numbers 5-6, June, 1999, Pages 488-501. [link]
→ J. A.
Teixeira de Freitas, Hybrid finite element
formulations for elastodynamic analysis in the frequency domain,
International Journal of Solids and Structures, Volume 36, Issue 13, May,
1999, Pages 1883-1923. [link]
Proceedings:
→ I.
D. Moldovan, D. T. Cao and J. A. Teixeira de Freitas, Hybrid-Trefftz stress
element for biphasic elastostatics, in Proc. of the Congresso de Métodos
Numéricos em Engenharia, Coimbra, Portugal, 2011. [link]
→ I. D. Moldovan, D. T. Cao and J.
A. Teixeira de Freitas, Hybrid-Trefftz displacement
and stress elements for biphasic elastostatics, in Proc. of the 19th Computer
Methods in Mechanics Congress, Warsaw, Poland, 2011. [link]
→ A.H.
Jesus, I. Cismasiu and J. A. Teixeira de Freitas, Fully automatic p-adaptive hybrid-Trefftz
displacement elements, Computer Methods in Mechanics, Warsaw, 2011. [link]
→ J.
A. Teixeira de Freitas, C.-T. Pham and J. B. Pargana, Hybrid-mixed finite
element modelling of the early age thermal response of concrete, Congresso de
Métodos Numéricos em Engenharia, Coimbra, 2011. [link]
→ J. A. Teixeira de Freitas and M. Toma, Hybrid-Trefftz
Displacement Elements for Incompressible Biphasic Media, Tenth International
Conference on Computational Structures Technology, Valência,
2010. [link]
→ I. D. Moldovan, J. A. Teixeira de
Freitas and D. T. Cao, Sensitivity Assessment of
Hybrid-Trefftz Stress and Displacement Elements for Poroelasticity, in Proc.
of the 4th European Congress on Computational Mechanics, Paris,
France, 2010. [link]
→ J. A.
Teixeira de Freitas, Hybrid-Trefftz stress elements
for cohesive fracture analysis, Invited Lecture, in Proc. of the Leuven
Symposium on Applied Mechanics in Engineering, The Trefftz workshop, Leuven,
Belgium, March 31 - April 2, 2008. [link]
→ I. D. Moldovan, J. A. Teixeira de
Freitas, Hybrid-Trefftz stress and displacement
elements for dynamic analysis of bounded and unbounded saturated porous
media, in Proc. of the Leuven Symposium on Applied Mechanics in Engineering,
The Trefftz workshop, Leuven, Belgium, March 31 - April 2, 2008. [link]
→ M. Toma,
J. A. Teixeira de Freitas: Hybrid-Trefftz stress
and displacement elements for transient analysis of incompressible saturated
porous media, in Proc. of the Leuven Symposium on Applied Mechanics in
Engineering, The Trefftz workshop, Leuven, Belgium, March 31 - April 2, 2008.
[link]
→ J. A. Teixeira
de Freitas, Hybrid finite element formulations,
Invited Lecture, MISG, Johannesburg, 2008. [link]
→ J. A. Teixeira de Freitas, I. D. Moldovan and M. Toma:
Mixed and Hybrid Stress Elements for Biphasic Media, in Proc. of the
Fifteenth UK Conference of the Association of Computational Mechanics in
Engineering, B.H.V. Topping (Editor), Civil-Comp Press, Stirling,
United Kingdom, paper 4, 2007.
→ I. D. Moldovan, J. A. Teixeira de
Freitas: Hybrid-Trefftz finite element models for
bounded and unbounded elastodynamic problems, in Proc. of the Third European
Conference on Computational Mechanics, Lisbon, Portugal, 2006, Springer, Ed. [link]
→ J. A. Teixeira de Freitas, I. D. Moldovan and M. Toma:
Trefftz spectral analysis of biphasic media, in Proc. of the Sixth World
Congress on Computational Mechanics in conjunction with the Second
Asian-Pacific Congress on Computational Mechanics, Beijing, China, September
5-10, 2004, pp. 678-683.
Theses:
→ Jesus,
A.H., 2011, Análise Estrutural com Elementos Finitos Híbridos-Trefftz e Refinamento
P-adaptativo, Lisbon, Portugal [M. Sc. thesis]: Faculdade de Ciências e
Tecnologia, Universidade Nova de Lisboa. [link]
→ Marques,
J.V.M., 2011, Modelação da Hidratação do Cimento em Betões, Lisbon, Portugal
[M. Sc. thesis]: Instituto Superior Técnico, Universidade Técnica de Lisboa.
[link]
→ Vitorino,
G.M.S.H., 2010, Modelação de Ondas de Rayleigh, Lisbon, Portugal [M. Sc.
thesis]: Instituto Superior Técnico, Universidade Técnica de Lisboa. [link]
→ Quaresma,
S.R., 2010, Modelação do Campo Sonoro, Lisbon, Portugal [M. Sc. thesis]:
Instituto Superior Técnico, Universidade Técnica de Lisboa. [link]
→ Ferreira,
A.M., 2008, Modelação do Comportamento de Solos Saturados, Lisbon, Portugal
[M. Sc. thesis]: Instituto Superior Técnico, Universidade Técnica de Lisboa.
[link]
→ Paulo,
C.I.A., 2008, Modelação do Comportamento Elástico Linear de Placas com Fendas
Abertas e Reparadas , Lisbon, Portugal [M. Sc. thesis]: Instituto Superior
Técnico, Universidade Técnica de Lisboa. [link]
→ Moldovan,
I.D., 2008, Hybrid-Trefftz Finite Elements for Elastodynamic Analysis of
Saturated Porous Media, Lisbon, Portugal [Ph. D. thesis]: Instituto Superior
Técnico, Universidade Técnica de Lisboa. [link]
→ Toma,
M., 2008, Modelling of Hydrated Soft Tissues Using Hybrid-Trefftz Finite
Elements, Lisbon, Portugal [Ph. D. thesis]: Instituto Superior Técnico, Universidade
Técnica de Lisboa. [link]
→ Cismaşiu,
C., 2000, The Hybrid-Trefftz Displacement Element for Static and Dynamic
Structural Analysis Problems, Lisbon, Portugal [Ph.D. thesis]: Instituto
Superior Técnico, Universidade Técnica de Lisboa, 266 p. [link]
→ Wang,
Z., 2000, Elastoplastic Structural Analysis with Hybrid Stress Elements,
Lisbon, Portugal [Ph.D. thesis]: Instituto Superior Técnico, Universidade
Técnica de Lisboa, 260 p. [link]
Reports:
→ I. D. Moldovan, D. T. Cao and J.
A. Teixeira de Freitas, Hybrid-Trefftz Elements for
Elastic Unsaturated Porous Media, Internal Report, Catholic University of
Portugal, Lisbon, 2012. [link]
→ I. D. Moldovan, J. A. Teixeira de
Freitas, Hybrid-Mixed Elements for Elastic
Non-Linear Porodynamics, Internal Report, Catholic
University of Portugal, Lisbon, 2012. [link]
→ J. A.
Teixeira de Freitas, C.-T. Pham, J. B. Pargana and J. V. M. Marques, Alternative Finite Element
Formulations for Transient Thermal Problems: Application to the Modelling of the Early Age Thermal Response of Concrete,
Internal Report, DECivil, Instituto
Superior Técnico, Technical University of Lisbon,
Lisbon, 2010. [link]
→ J. A. Teixeira de Freitas, I. D. Moldovan and D. T. Cao, Dependencies in
the Implementation of Hybrid-Trefftz Elements for Poroelastostatics,
Internal Report, DECivil, Instituto
Superior Técnico, Technical University of Lisbon, Lisbon,
2010. [link]
→ I. D. Moldovan, Hybrid-Trefftz
Displacement and Stress Elements for Biphasic Elastostatics, Internal Report,
Catholic University of Portugal, Lisbon, 2010. [link]
→ J. A. Teixeira de Freitas, C. I. A. Paulo and N. Fowkes,
Modelling of Crack Repair with Hybrid-Trefftz
Stress Elements, Internal Report, DECivil, Instituto Superior Técnico,
Technical University of Lisbon, Lisbon, 2009. [link]
→ J. A. Teixeira de Freitas, V. M. S. Leitão and N.
Fowkes, Modelling
Singularities and Discontinuities with Hybrid-Trefftz Stress Elements,
Internal Report, DECivil, Instituto
Superior Técnico, Technical University of Lisbon,
Lisbon, 2009. [link]
→ J.B. Pargana,
One Dimensional Hybrid-Trefftz Elements for the Early Age Transient Thermal
Response of Concrete, Internal Report, DECivil, Instituto Superior Técnico,
Technical University of Lisbon, Lisbon, 2009. [link]
→ J. A. Teixeira de Freitas, I. D. Moldovan and D. T. Cao, Time Integration
with Hybrid-Trefftz Finite Elements, Internal Report, DECivil,
Instituto Superior Técnico,
Technical University of Lisbon, Lisbon, 2009. [link]
→ J. A. Teixeira de Freitas, Rayleigh Waves in Saturated in Poroelastic Media, Internal Report, DECivil,
Instituto Superior Técnico,
Technical University of Lisbon, Lisbon, 2009. [link]
→ J. A. Teixeira de Freitas and A. L. R. B. Neves e
Sousa, Implementation of Hybrid-Trefftz Elements for 3D Acoustics, Internal
Report, DECivil, Instituto
Superior Técnico, Technical University of Lisbon,
Lisbon, 2009. [link]
→ J. A. Teixeira de Freitas, Uniqueness Conditions for Non-Hermitian Systems, Internal Report, DECivil,
Instituto Superior Técnico,
Technical University of Lisbon, Lisbon, 2008. [link]
→ J. A.
Teixeira de Freitas, Hybrid stress elements for
dynamic analysis of poroelastoplastic media,
Internal Report, DECivil, Instituto
Superior Técnico, Technical University of Lisbon,
Lisbon, 2008. [link]
→ J.
A. Teixeira de Freitas, L. M. S. Castro, Hybrid stress elements for continuum
damage analysis, Internal Report, DECivil, Instituto Superior Técnico,
Technical University of Lisbon, Lisbon, 2008. [link]