Application of a Digital Strain Analyzer AutoGrid at Thin Sheet Metals Mechanical Characteristics Preparation and Assessment of their Drawability

Abstract

The paper presents the results of mechanical properties testing of thin sheet metal of INCONEL 625 and 718 alloys. These studies are a continuation of experience in the preparation of the technological characteristics of metal strips plasticity necessary for carrying out numerical simulations [1]. In order to process sheets now become necessary to design the process using software such as thermo-mechanical simulation e.g. Eta/DYNAFORM. On the road of numerical simulation are sought optimal conditions for processing sheets. It brings reducing the cost of industrial tests. However, becomes strictly necessary characteristics of mechanical and technological properties describing the characteristics of the charges for forming. Here the problem is solved if we forming limit curves (FLCs) designated and technological tests conducted. Using the FLCs is comprehensively defined stamping sheet metal press formability and technological tests allow the mapping of the actual operating conditions selected stamping operations. In the presented study used modern digital analyzer AutoGrid of local deformations and the method of image analysis of deformed mesh subdivision. The use of mesh analyzer and vision systems method significantly speeds up the possibility of producing FLCs. Also measurement accuracy is very high. Selected Inconel alloys are evaluated quantitatively and qualitatively by preparing their properties characterization. The acquired data entered into the database material properties of sheet metal and used in the numerical simulation of stamping process of Inconel 625 cone drawpiece. The legitimacy of the use of modern strain analyzer AutoGrid has been confirmed.

Archives of Metallurgy and Materials

“…A modern AutoGrid local strain analyzer and a method of image analysis of the deformed parting grids with mesh parameter of 1 mm diameter have been used for quantitative evaluation of drawability of Inconel alloy sheets. More details of Inconel alloys sheet metals forming limit curves determination are presented in previous publications [4,9,11,12]. FLC of Inconel 718 was implemented into material model of numerical simulation in Eta / Dynaform 5.9 software [13].…”

Research on Liquid Forming Process of Nickel Superalloys Thin Sheet Metals

“…Hence, the sheet metal forming of stamping elements using liquid requires a special procedure for designing the manufacturing process of the items and that has been proposed by the author. This procedure is based on many years of experience in the assessment of drawability evaluation methods and modeling of manufacturing processes [1][2][3][4][5]. The basis of numerical modelling are experience and good FEM simulation practice acoording to [15,16] and especially for Inconel superalloys [17][18][19][20][21].…”

“…A modern AutoGrid local strain analyzer and a method of image analysis of the deformed parting grids (coordination nets with mesh parameter of 1 mm diameter) have been used for quantitative evaluation of drawability of Inconel alloy sheets. More details of Inconel alloys sheet metals forming limit curves determination are presented in previous publications [2][3][4][5]. Forming limit curves for tested Inconel alloys have been shown in (Fig.…”

“…The process of forming liquid is currently the only alternative method for obtaining complex shapes, coatings, and especially if we do it with high-strength materials. In the case of nickel superalloys the search for efficient methods to manufacture of the shaped shell is one of the most considerable problems in aircraft industry [1][2][3][4][5]. However, the automotive industries have the same problem with so-called advanced high-strength steels (AHSS).…”