The Journal of the National Science Foundation Sri Lanka publishes results research in all aspects and Technology. journal also has a website at http://www.nsf.gov.lk/. 2021 Impact Factor: 0.682The JNSF provides immediate open access to its content on principle that making freely available public supports greater global exchange knowledge.Cover :Leatherback (a), green (b - adult & f hatchli...

The present paper aims to study the crack propagating behavior of a stiffened plate under tensile and bending displacement load loads. extended finite element method (XFEM) is used analyze residual ultimate strength plates with central crack. quasi-static growth process simulated by software ABAQUS. validity grid validated numerical comparing fatigue rate round compact tension specimen (RCT) re...

The nonlinear buckling analysis of functionally graded carbon nanotube-reinforced composite (FG-CNTRC) plates subjected to axial compression load is analytically examined in this paper. Assuming that the FG-CNTRC are stiffened by an oblique stiffener system. Reddy’s higher-order shear deformation plate theory (HSDPT) with geometrical nonlinearities von Kármán applied establish basic formulation...

Sheet-metal forming is one of the most important manufacturing processes in automotive industry. This study proposes a multiobjective optimisation scheme that controls both sheet-metal formability and springback. First, mechanical properties DP590 steel were characterised to obtain parameters limit diagram (FLD) DP590. Then, FLD, thinning rate, average springback selected as quality evaluation ...

The difference in delamination onset predictions based on the type and location of the assumed initial damage are compared in a specimen consisting of a tapered flange laminate bonded to a skin laminate. From previous experimental work, the damage was identified to consist of a matrix crack in the top skin layer followed by a delamination between the top and second skin layer (+45o/-45o interfa...