|
Vol.8, No2, 2008,
pp. 107-113 |
|
NUMERICAL ANALYSIS OF TENSILE SPECIMEN FRACTURE WITH CRACK IN HAZ Gjorgji Adžiev, Todor Adžiev 1 Aleksandar Sedmak 2 1 Faculty of Mechanical Engineering, University of Skopje, Macedonia 2 Faculty of Mechanical Engineering, University of Belgrade, Serbia |
|
Abstract Numerical solutions enable investigation of complex problems, including analysis of various influences, especially in cases when experimental research and mathematical solutions are not appropriate, such as high price, problem complexity, etc. In this article, numerical modelling and analysis is presented, concerning fracture behaviour of HAZ cracked welded tensile specimens i.e. the influence of welded joint heterogeneity on the distribution of stress and strain in front of the crack tip and the reasons causing failure. Two cases are analysed: crack tip located in fine-grained HAZ and crack tip located in coarse-grained HAZ. Experimental research in both cases exhibited that the barrier act of welded joint mismatch, after the initial propagation of crack in fine-grained or coarse-grained HAZ, has brought to a turn of crack propagation into more ductile base metal, thus decreasing the crack propagating speed. The article brings some observations regarding such behaviour by applying numerical simulations to the experiment. Keywords: overmatched welded joint, fine-grained heat-affected-zone, coarse-grained heat-affected-zone, crack propagation, finite element method |
|
full article (714 kB)
|
