Baran, Ismet

Hattel, Jesper Henri

Tutum, Cem Celal

Tutum, Cem C.

Hattel, Jesper H.

NARCIS 

Evaluation of the process induced residual stresses at the web-flange junctions of pultruded GFRP profiles

Online Research Database In Technology

                       General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.  • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal   If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.     Downloaded from orbit.dtu.dk on: Dec 20, 2017Evaluation of the process induced residual stresses at the web-flange junctions ofpultruded GFRP profilesBaran, Ismet; Tutum, Cem Celal; Hattel, Jesper HenriPublished in:Proceedings of the 17th International Conference on Composite Structures (ICCS)Publication date:2013Link back to DTU OrbitCitation (APA):Baran, I., Tutum, C. C., & Hattel, J. H. (2013). Evaluation of the process induced residual stresses at the web-flange junctions of pultruded GFRP profiles. In Proceedings of the 17th International Conference on CompositeStructures (ICCS)EVALUATION OF THE PROCESS INDUCED RESIDUAL STRESSES AT THE WEB-FLANGE JUNCTIONS OF PULTRUDED GFRP PROFILES Ismet Baran*, Cem C. Tutum, Jesper H. Hattel Technical University of Denmark, Department of Mechanical Engineering, Denmark *E-mail: isbar@mek.dtu.dk  Abstract Pultrusion is one of the most cost efficient composite manufacturing processes in which constant cross sectional continuous composite profiles are produced. Recently, pultruded structures are foreseen to have potential for the replacement of conventional materials used in the construction industry. A consequence of the increasing usage of pultruded profiles in the construction industry requires detailed understanding of the mechanical behavior as well as the failure mechanism of the profile.  The process induced residual stresses and distortions for the pultrusion of an I-beam profile, which has not been considered in the literature up to now, are predicted in the present study. The residual stresses most likely have an important effect on the mechanical behaviour of the pultruded I-beam especially at the web-flange junction.  The temperature and the cure degree distributions are first obtained at steady state in the thermo-chemical analysis of the pultrusion process and afterwards used in the mechanical analysis in which the residual stresses and distortions are evaluated. More specifically, a 3D transient Eulerian thermo-chemical analysis is coupled with a 2D quasi-static Lagrangian plane strain mechanical analysis of the pultrusion process which is a quite new approach in this specific field. The instantaneous cure dependent resin modulus is used for the present simulation of the pultrusion process since post-curing after cooling is normally not used in pultrusion.  

Pultrusion is one of the most cost efficient composite manufacturing processes in which constant cross sectional continuous composite profiles are produced. Recently, pultruded structures are foreseen to have potential for the replacement of conventional materials used in the construction industry. A consequence of the increasing usage of pultruded profiles in the construction industry requires detailed understanding of the mechanical behavior as well as the failure mechanism of theprofile.The process induced residual stresses and distortions for the pultrusion of an I-beam profile, which has not been considered in the literature up to now, are predicted in the present study. The residual stresses most likely have an important effect on the mechanical behaviour of the pultruded I-beam especially at the web-flange junction. The temperature and the cure degree distributions are first obtained at steady state in the thermo-chemical analysis of the pultrusion process and afterwards used in the mechanical analysis in which the residual stresses and distortions are evaluated. More specifically, a 3D transient Eulerian thermo-chemical analysis is coupled with a 2D quasi-static Lagrangian plane strain mechanical analysis of the pultrusion process which is a quite new approach in this specific field. The instantaneous cure dependent resin modulus is used for the present simulation of the pultrusion process since post-curing after cooling is normally not used in pultrusion

University of Twente Research Information

EVALUATION OF THE PROCESS INDUCED RESIDUAL STRESSES AT THE WEB-FLANGE JUNCTIONS OF PULTRUDED GFRP PROFILES Ismet Baran*, Cem C. Tutum, Jesper H. Hattel Technical University of Denmark, Department of Mechanical Engineering, Denmark *E-mail: isbar@mek.dtu.dk  Abstract Pultrusion is one of the most cost efficient composite manufacturing processes in which constant cross sectional continuous composite profiles are produced. Recently, pultruded structures are foreseen to have potential for the replacement of conventional materials used in the construction industry. A consequence of the increasing usage of pultruded profiles in the construction industry requires detailed understanding of the mechanical behavior as well as the failure mechanism of the profile.  The process induced residual stresses and distortions for the pultrusion of an I-beam profile, which has not been considered in the literature up to now, are predicted in the present study. The residual stresses most likely have an important effect on the mechanical behaviour of the pultruded I-beam especially at the web-flange junction.  The temperature and the cure degree distributions are first obtained at steady state in the thermo-chemical analysis of the pultrusion process and afterwards used in the mechanical analysis in which the residual stresses and distortions are evaluated. More specifically, a 3D transient Eulerian thermo-chemical analysis is coupled with a 2D quasi-static Lagrangian plane strain mechanical analysis of the pultrusion process which is a quite new approach in this specific field. The instantaneous cure dependent resin modulus is used for the present simulation of the pultrusion process since post-curing after cooling is normally not used in pultrusion.  

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http://doc.utwente.nl/92089/1/ICCS17_Ismet%20Baran.pdf

Evaluation of the process induced residual stresses at the web-flange junctions of pultruded GFRP profiles

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