Aluminium 7075 is frequently used in aircraft structures. Aluminium metal-matrix composites with 0 % TiC (w/%), 8 % TiC and 16 % TiC were produced using the powder-metallurgy technique. Metallurgical studies, such as X-ray diffraction (XRD) and scanning electron microscopy (SEM), were made to confirm the occurrence of reinforcements. A cold-upset test was conducted on the synthesized composites and different stress parameters were calculated to study the forming behaviour of the produced composite in the tri-axial stress-state condition. The values of the stresses were found to be highest for the aluminium composite reinforced with AA7075 + 16 % TiC.

Nowadays tailor-welded blanks (TWBs) are used in the automotive industries to meet economic concerns, government regulations and design of vehicles with reduced weight and allow cost reduction. This technique is also employed while improving structural integrity and crash performance. Due to the raising environmental concerns about automotive emissions and the scarcity of natural resources, we need to reduce vehicle weight and improve fuel economy. As a result, the automotive industries employ TWBs. In this work, three grades of aluminum sheets (5052, 6061 and 8011) with a 2-mm thickness were made thinner by cold rolling, obtaining three different thicknesses of (0.8, 1.0 and 1.2) mm. Sheets were then joined using the cold-metal-transfer (CMT) welding process. The Taguchi design of experiment (DOE) was carried out for the L27 orthogonal array with nine variables at three levels. Due to this optimization process, the welding decreased the formability of TWBs compared with the parent material and this was reflected in the forming behavior, represented by the strain-distribution profiles. Keywords: tailor-welded blanks, aluminum alloy, incremental forming, cold metal transfer Dandanes se zaradi ekonomi~nosti, vladnih regulativ, dizajna vozil z zmanj{anjo te`o in zaradi zmanj{evanja stro{kov v avtomobilski industriji uporabljajo prilagojeni varjeni surovci (angl. TWBs). Ta tehnika se uporablja tudi zaradi izbolj{anja strukturne celovitosti in obna{anja pri nesre~ah. Zaradi pove~anja okoljskih vpra{anj glede emisij izpu{nih plinov in pomanjkanja naravnih virov, je treba zmanj{ati te`o vozila in izbolj{ati ekonomi~nost porabe goriva. Posledi~no avtomobilska industrija uporablja prilagojene varjene surovce (TWB). V prispevku so bili trije sloji plo~evine aluminija (5052, 6061 in 8011), z debelino 2 mm, stanj{ani s postopkom hladnega valjanja na tri razli~ne debeline (0,8, 1,0 in 1,2) mm. Plasti aluminija so bile nato zdru`ene s postopkom varjenja s kovinskim prenosom (angl. CMT). Taguchijeva metoda na~rtovanja eksperimentiranja (angl. DOE) je bila opravljena za L27 ortogonalno polje z devetimi spremenljivkami na treh ravneh. Iz tega optimizacijskega procesa varjenje zmanj{a sposobnost TWB v primerjavi z originalnim materialom, kar se odra`a v obna{anju formiranj, ki ga predstavljajo profili razdeljevanja sevov. Klju~ne besede: prilagojeni varjeni surovci, aluminijeva zlitina, postopno oblikovanje, hladen transfer kovine

In this paper, the influence of tensile and formability parameters on the forming limit diagram is reported and a model is created to predict the forming limit strains of various grades of aluminium sheet metals. Aluminium alloys of grades AA5052, AA6061 and AA8011 with a thickness 0.8 mm, 1.0 mm and 1.2 mm have been selected for the study. Experiments are conducted to construct the forming limit diagram (FLD) for the above mentioned sheet metals. Tensile tests were conducted to evaluate strain hardening index, strength coefficient, ductility, yield strength, ultimate tensile strength, normal anisotropy, planar anisotropy and strain rate sensitivity. The fractured surfaces of the specimens were viewed with a scanning electron microscope. Using Design of Experiments (DOE), regression modelling was done by taking the tensile properties and formability parameters as input variables and the forming limit strain as response. Regression equations were created to predict the limiting strain values at the tension-tension, plane strain and tension-compression strain states. The experimentally evaluated strain values were compared with the predicted strain values and the comparison shows good agreement of the values. The Taguchi method of optimization was used to find the optimum values for the input variables and using these optimum values, the optimum forming limit strains were found. It is found that the so created regression model predicts the FLD of various grades of sheet metals by which the tedious job of experimental determination of the FLD can be avoided.Studies on Testing and Modelling of P. Chinnaiyan, S.N. Chinnaiyan Formability in Aluminium Alloy Sheets Forming (K), normal anisotropy (r) and strain rate sensitivity (m) can be determined by using the tensile test. The forming limit diagram was introduced by Keelar [10], an extensive work was done by Goodwin [11] and the evaluation of the FLD was made simple by Hecker [12]. Strano and Colosimo [13] emphasised an approach to determine the forming limit curve based on experimental results. Their work focused on the separation of safe strains and failure strains.In spite of such efforts to improve the experimental accuracy of determining the forming limits, it is essential to conduct a complete experimental investigation. Tigran Abovan et al. [4] created a finite element based criterion for predicting the FLD under isothermal conditions for the AA5000 series. Their findings indicate that the developed criterion predicted the forming limit for each strain path. Elangovan et al.[9] developed a model to predict the forming limit strain of perforated AA8011 alloy sheets of varying geometrical feature by using the artificial neural network. Ravikumar [14] made an attempt to correlate the crystallographic texture with the formability parameters. Korhonen [15] conducted experiments to determine the FLD along the rolling and transverse direction. They found that the measured limit strain in the case of the uniaxial tension is well predicted by the Rice-Tracey theory. ...