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204 Ovidiu Niţă et al. căreia acest fenomen, de creştere bruscă a rugozităţii, poate fi utilizat ca şi criteriu de apariție a gâtuirii localizate sau a ruperii. Astfel, pentru definirea momentului în care deformația semifabricatului intră în zona critică este suficient să măsurăm rugozitatea în diferite stadii de deformare și să o reprezentăm în funcție de deformația maximă.
BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi“ din Iaşi, Tomul LVIII (LXII), Fasc. 4, 2012 Secţia CONSTRUCŢII DE MAŞINI DETERMINATION OF FORMING LIMIT DIAGRAMS USING HYDRAULIC BULGING TEST Received: October 13, 2012 Accepted for publication: October 15, 2012 BY OVIDIU NIŢĂ ∗ and VASILE BRAHA „Gheorghe Asachi” Technical University of Iaşi, Department of Machine Manufacturing Technology Abstract. Estimation of technological possibility of obtaining a piece by stamping can be done most effectively by using the forming limit diagrams (FLD). The aim of this paper was to determine the deformation limit diagrams, for three metallic materials commonly used in Romanian industry, using hydraulic bulging test. Also, the authors wanted to highlight the influence of blank thickness or the deformation path on FLD. Key words: forming limit diagrams, FLD, bulging test etc. 1. Introduction Sheet metal deformability expresses their ability to be plastic deformed and to take a given form, without defects in the specimen (Banabic, 1992). One of the most popular methods used for assessing the capacity of sheets deformation is the forming limit diagrams (FLD) method. Basically, forming limit curves mark off (inside a rectangular system of axes) the acceptable deformations from the zone where deformation turns the specimen in to scrap (Fig. 1a) (Marciniak, 2002; Banabic, 2005). Forming limit diagram is a graph obtained by plotting the evolution of the main deformations (ε1, ε2) in plane sheet, when fracture and necking occurs (Fig. 1b). As a result of using two limit deformation criterions (necking and fracture) the FLD have two types of forming limit curves (FLC): one for ∗ Corresponding author: e-mail: ov_nita@yahoo.com
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