An Experimental Study of the Influence of Size Effect on Springback of Micro Sheet Forming

2006 ◽  
Author(s):  
Jenn-Terng Gau ◽  
Chris Principe ◽  
Fengchen Yang
Keyword(s):  
Experimental Study ◽  
Size Effects ◽  
Low Cost ◽  
Thin Sheet ◽  
Sheet Forming ◽  
Three Point Bending ◽  
Key Factor ◽  
Thin Sheet Metal ◽  
Springback Behavior ◽  
Grain Diameter

An efficient and low cost experiment was conducted to investigate the influence of grain size effects on springback of thin sheet metal. A three-point bending setup was used to test Aluminum 1100 O-Temper and Brass 26000 1/2 Hard (H02). Thickness and average grain diameter were controlled to achieve a range of desired T/D (thickness/grain diameter) ratios because T/D ratio is a key factor that influences the springback behavior in micro sheet forming. The results from this experiment show that as T/D ratio becomes smaller (T/D > 1 → 1) the springback amount increases at a decreasing slope. And as T/D continues to become even smaller (T/D < 1) the springback amount begins to decrease. These behaviors demonstrate the influence of size effects on springback.

scholarly journals The Methacrylate Adhesive to Double-Lap Shear Joints Made of High-Strength Steel—Experimental Study

Materials ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 120 ◽  
Author(s):  
Marta Kałuża ◽  
Jacek Hulimka ◽  
Jan Kubica ◽  
Marcin Tekieli
Keyword(s):  
Experimental Study ◽  
Automotive Industry ◽  
Optical Measurement ◽  
Thin Sheet ◽  
High Strength ◽  
Engineering Structures ◽  
Steel Component ◽  
Anchorage Length ◽  
Lap Shear ◽  
Thin Sheet Metal

In typical technical applications, steel components are usually connected by welding or with mechanical connectors. An alternative solution, typical in the aviation and automotive industry, but not widespread in engineering structures, is to join thin sheet metal using adhesives. The article presents an experimental study of adhesive joints used in overlap connections subjected to static tension. A methacrylate adhesive, selected experimentally from a range of adhesives, which combines the optimum strength and strain properties, was tested. The laboratory tests were carried out on double-lap specimens made of high-strength Domex 700 steel. On the basis of the experimental results, the behavior of the specimens and their failure mechanism, depending on the anchorage lengths used (200, 300 and 400 mm), are described. The tests confirmed the effectiveness of the selected methacrylate adhesive in a practical application. It was shown that with the appropriate anchorage length (adequate to the type of steel components and the joint geometry) between 300 and 400 mm, the capacity of the adhesive joint is higher than the capacity of a single steel component. Two types of specimen behavior were recognized: Quasi-brittle, which occurs at the anchorage length of 200 mm, and ductile, observed for 300 mm and 400 mm anchoring. In addition, thanks to the optical measurement method used, a detailed strain distribution on the specimen surface was determined. The data will be used for subsequent validation of an analytical and numerical model.

Dynamic Characteristics of a Micro-Sheet-Forming Machine System

2012 ◽  
Vol 504-506 ◽  
pp. 599-604 ◽  
Author(s):  
Yi Qin ◽  
Akhtar Razul Razali ◽  
Mei Zhou ◽  
Jie Zhao ◽  
Colin Harrison ◽  
...  
Keyword(s):  
Sheet Metal ◽  
Dynamic Characteristics ◽  
Dynamic Performance ◽  
Thin Sheet ◽  
Sheet Forming ◽  
Element Analysis ◽  
Machine System ◽  
Micro Parts ◽  
Thin Sheet Metal ◽  
Tooling System

Dynamic characteristics of a micro-forming machine system are of significant importance to be considered if high-precision micro-parts are to be produced. This is because forming tolerances may be within a range of sub-microns up to 5-15% of the thickness of a thin sheet-metal (e.g. <100µm) being used in micro-sheet-forming. Achievability of the quality parts often vary with the machine-system performance and process parameters being set, and it largely depends on the understanding of the machine and tool system’s dynamic characteristics and effectiveness of the control of the machine and the process. Nevertheless, there has been lack of the effort in this field of research. Significant number of the efforts in this field were focused mainly on discrete and/slow processes where the dynamic characteristics of the forming systems were often neglected. This paper presents the dynamic characteristics of an autonomous micro-sheet-forming machine system and its effect towards the produced parts’ quality. These have been studied by combining finite element analysis and forming experiment, with a particular focus on the combined effects from the machine, tooling system and the sheet-metal feeding system (the strip feeder). The results showed that, besides importance of the dynamic performance of the machine and the tool-system, dynamic characteristics of the material-feeding plays an important part in determining the parts’ quality produced.

scholarly journals Size effects in thin sheet metal forming

2015 ◽  
Vol 100 ◽  
pp. 012051
Author(s):  
T A Chang ◽  
A R Razali ◽  
N A I Zainudin ◽  
W L Yap
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Size Effects ◽  
Metal Forming ◽  
Thin Sheet ◽  
Thin Sheet Metal

A constitutive model for thin sheet metal in micro-forming considering first order size effects

2010 ◽  
Vol 31 (2) ◽  
pp. 1010-1014 ◽  
Author(s):  
Wang Yun ◽  
Dong Peilong ◽  
Xu Zhenying ◽  
Yan Hua ◽  
Wu Jiangping ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Sheet Metal ◽  
Size Effects ◽  
Thin Sheet ◽  
Micro Forming ◽  
First Order ◽  
Thin Sheet Metal

Experimental and Numerical Analysis of Blanking for Thin Sheet Metal Parts

2001 ◽  
Vol 4 (3-4) ◽  
pp. 319-333
Author(s):  
Vincent Lemiale ◽  
Philippe Picart ◽  
Sébastien Meunier
Keyword(s):  
Numerical Analysis ◽  
Sheet Metal ◽  
Thin Sheet ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Thin Sheet Metal

scholarly journals Investigations on arc brazing for galvanized heavy steel plates in steel and shipbuilding

2021 ◽  
Author(s):  
Philipp Andreazza ◽  
Andreas Gericke ◽  
Knuth-Michael Henkel
Keyword(s):  
Low Cost ◽  
Thin Sheet ◽  
Steel Structures ◽  
Tensile Tests ◽  
Fatigue Tests ◽  
Steel Plates ◽  
Galvanized Steel ◽  
Filler Materials ◽  
Static Tensile ◽  
Brazed Joints

AbstractArc brazing with low-melting copper-based filler materials, which has long been established and standardized in the thin sheet sector, offers numerous advantages in the processing of predominantly electrolytically galvanized steel structures. In steel and shipbuilding, on the other hand, equipment parts made of thick steel sheets are hot-dip galvanized at low cost and with good corrosion-inhibiting properties. Quality welding of such constructions is not possible without special precautions such as removing the zinc layer and subsequent recoating. With regard to greater plate thicknesses, arc brazing was analyzed in these investigations as an alternative joining method with regard to its suitability for practical use. Within the scope of the investigations, CuSi3Mn, CuMn12Ni2, and four different aluminum bronzes were examined on different sheet surface conditions with regard to the geometrical and production parameters. This was carried out by build-up and connection brazing, executed as butt and cross joints. Quasi-static tensile tests and fatigue tests were used to assess the strength behavior. In addition, metallographic analyses are carried out as well as hardness tests. The suitability for multi-layer brazing and the tendency to distortion were also investigated, as well as the behavior of arc brazed joints under corrosive conditions.

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