Results 221 to 230 of about 110,269 (254)

Fracture forming limit curve prediction by ductile fracture models

Procedia Structural Integrity
The fracture forming limit curve is an essential tool giving information about fracture initiation in metal forming applications. In order to obtain a fracture-forming limit curve, the Nakajima test should be carried out. However, these tests are costly and time-consuming processes.
Bora Sener
exaly   +4 more sources

Some of the next articles are maybe not open access.

Related searches:

Advanced Models for the Prediction of Forming Limit Curves

2016
During the forming of flat sheet metal into a more complex shape, a number of plastic instabilities may occur subsequently. A ‘plastic instability’ occurs when the zone of plastic deformation is suddenly confined to a smaller zone. The first plastic instability which usually occurs in forming processes is the onset of diffuse necking, in which plastic ...
Dorel Banabic, Dan-Sorin Comsa, Philip Eyckens, Abdolvahed Kami, Mihai Gologanu   +4 more
openaire   +1 more source

Effect of friction in stretch forming and its influence on the forming limit curve

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 2014
Formability is an important property requirement in sheet metal forming and mostly useful to automobile and aerospace industries. Every product design starts with finite element simulation before the die design and material selection stage. The forming limit curve along with finite element results acts as tool to investigate whether the design is ...
G Manikandan, Rahul K Verma, Pinaki Biswas   +2 more
openaire   +1 more source

A few methods of analytical calculation of forming-limit curves

Journal of Materials Processing Technology, 1995
Abstract The main aim of the present work is the modification of analytical calculation methods for forming limit curves. The calculated curves were compared with experimental data for steel and aluminium sheets and the best modifications were chosen.
Jerzy Gronostajski, Zbigniew Zimniak
openaire   +1 more source

An Approach for Prediction of Coil Specific Forming Limit Curves

BHM Berg- und Hüttenmännische Monatshefte, 2019
Forming limit curves (FLCs) are widely used for predicting failure in sheet metal forming operations. FLCs are determined in the laboratory according to ISO 12004‑2 using the Nakajima test. The testing procedure involves stretching a series of dog-bone shaped blanks with a hemispherical punch until failure occurs.
Timo Manninen, Jari Larkiola, Mikko Palosaari   +2 more
openaire   +1 more source

Forming limit curves: Out-of-plane and in-plane stretching

Journal of Mechanical Working Technology, 1982
Abstract The study of deformation and failure of biaxially stretched sheets is of considerable practical interest in the area of sheet metal press forming. During biaxial stretching of sheet metal, the uniform plastic straining regime is often followed by a localised plastic straining regime which finally leads to fracture. The technique of analysing
A.R. Ragab, B. Baudelet
openaire   +1 more source

Prediction of Forming Limit Curves from Hardness for Steels

Journal of Materials Engineering and Performance, 2016
This paper presents a method for predicting the strain-based forming limit curve (FLC) for steels using hardness. The stretching side (positive minor strain component) of the FLC was calculated by using a Marciniak-Kuczynski model with a non-quadratic yield function, while the drawing side (negative minor strain component) of the FLC was predicted ...
Erik J. Pavlina, Chester J. Van Tyne
openaire   +1 more source

Formability Limiting Curve of Mild Steel by Explosive Forming

1990
At the advent of increasing interest in high velocity forming techniques, the knowledge of maximum extent of formation without the risk of any failure becomes necessary. A Formability Limit Curve will represent a critical level curve separating FAIL region from SAFE region.
K. Raghukandan, P. V. Vaidyanathan, M. Rathinasabapathi   +2 more
openaire   +1 more source

Pre-strain correction of forming limit curves

Materials Research Proceedings
Abstract. Inherent features of the Nakajima test to determine forming limit curves (FLC) are inevitable bending strains and pre-strains originating from evolving punch contact in the early stage. Both effects are very annoying and bias the resulting FLC considerably, so that a direct comparison of materials with different gauges is impossible.
openaire   +1 more source

An investigation of the strain path dependence of the forming limit curve

International Journal of Solids and Structures, 1982
Abstract The dependence of the forming limit curve on the deformation history is examined by considering two specific examples of sheet metal forming, representative of two classes of non-proportional strain path: one example is an axisymmetric punch stretching problem, which gives rise to a gradual variation in the strain path from a proportional ...
openaire   +1 more source