Institute of Physics of Materials AS CR, v. v. i. > Projects > Correlation between structural changes, damage evolution and crack propagation behaviour of welded thermoplastics components

Correlation between structural changes, damage evolution and crack propagation behaviour of welded thermoplastics components

Investigatorprof. Ing. Pavel Hutař, Ph.D.
Number of Project101/09/J027
AgencyGrantová agentura České republiky
Duration2008-12-31 - 2011-12-30

Anotace
The advanced polymer systems contain welded joints, which can strongly influence its final lifetime. Important topic of the research is than study changes of the crack behaviour due to geometrical and material non-homogenity existing in this type of materials. General goal of the project lies in the development and suggestion of reliable techniques for estimation of a residual life time of welded polymeric structures. Slow crack growth, which can be described by the corresponding fracture mechanics parameters, plays an important part in this estimation. In the case of viscoelastic polymer materials the current methodology will be developed. The correlation between the experimental data and results of relevant numerical model will be presented. Development of procedures for transferability of the data from non-welded structure to welded one can help for more efficient design of polymer welded structures.

2017

Lach R., Krolopp T., Hutař P., Nezbedová E., Grellmann W.: Short-Term Stable Crack Propagation through Polyolefin Single and Bilayered Structures - Influence of Welding, Composition and Direction of Crack Propagation. Solid State Phenom. 258 (2017) 538-541


2013

Lach R., Hutař P., Veselý P., Nezbedová E., Knésl Z., Koch T., Bierögel C., Grellmann W.: Assessment with indentation techniques of the local mechanical behavior of joints in polymer parts. Polimery 58 (2013) 900-905


2012

Ševčík M., Hutař P., Náhlík L., Lach R., Knésl Z., Grellmann W.: Crack propagation in a welded polyolefin pipe. Int. J. Struct. Integr. 3 (2012) 148-157

Hutař P., Zouhar M., Nezbedová E., Sadílek J., Žídek J., Náhlík L., Knésl Z.: Constraint effect on the slow crack growth in polyethylene. Int. J. Struct. Integr. 3 (2012) 118-126

Ševčík M., Hutař P., Náhlík L., Lach R., Knésl Z., Grellmann W.: Crack growth modeling in a specimen with polymer weld. Key Eng. Mater. 488-489 (2012) 158-161


2011

Hutař P., Ševčík M., Náhlík L., Pinter G., Frank A., Mitev I.: A numerical methodology for lifetime estimation of HDPE pressure pipes. Eng. Fract. Mech. 78 (2011) 3049-3058

Zouhar M., Hutař P., Náhlík L., Knésl Z.: Damage of multilayer polymer materials under creep loading. Key Eng. Mater. 465 (2011) 153-156

Ševčík M., Knésl Z., Hutař P., Náhlík L.: The Effect of Polymer Pipe Weld Geometry on Creep Lifetime. Key Eng. Mater. 465 (2011) 175-178

Lach R., Hutař P., Veselý P., Nezbedová E., Knésl Z., Grellmann W.: Structural Changes, Evolution of Damage Parameters and Crack Propagation Behaviour in Welded Plastic Pipes. Key Eng. Mater. 465 (2011) 427-430

Zouhar M., Vallet L., Hutař P., Náhlík L.: Life time estimation of the multilayer plastic pipes. Key Eng. Mater. 452-453 (2011) 33-36

Zouhar M., Hutař P., Náhlík L., Knésl Z.: Effect of the time dependent material properties on the crack behaviour in the interface of two polymeric materials. Mech. Comp. Materials 47 (2011) 203-210

Ševčík M., Hutař P., Náhlík L.: Crack Behavior in a Welded Polyolefin Pipe. Mech. Comp. Materials 47 (2011) 263-270