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BS EN ISO 12004-2:2021

BS EN ISO 12004-2:2021

$167.15

Metallic materials. Determination of forming-limit curves for sheet and strip – Determination of forming-limit curves in the laboratory

Published By Publication Date Number of Pages
BSI 2021 38
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This document specifies testing conditions for use when constructing a forming-limit curve (FLC) at ambient temperature and using linear strain paths. The material considered is flat, metallic and of thickness between 0,3 mm and 4 mm.

NOTE

The limitation in thickness of up to 4 mm is proposed, giving a maximum allowable thickness to the punch diameter ratio.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
6 Foreword
8 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
10 5 Principle
11 6 Test pieces and equipment
6.1 Test pieces
6.1.1 Thickness of test pieces
6.1.2 Test piece geometry
12 6.1.3 Test piece preparation in test area
6.1.4 Number of different test piece geometries
6.1.5 Number of tests for each geometry
6.2 Application of grid
6.2.1 Type of grid
13 6.2.2 Grid application
6.2.3 Accuracy of the undeformed grid
6.3 Test equipment
6.3.1 General
15 6.3.2 Strain determination
6.3.3 Nakajima test
17 6.3.4 Marciniak test
19 7 Analysis of strain profile and measurement of ε1 – ε2 pairs
7.1 General
7.2 Evaluation using section lines (position-dependent measurement)
7.2.1 General
20 7.2.2 Position and processing of measurements
21 7.2.3 Extraction of the “bell-shaped curve” and determination of the inner limits for the best-fit curve through experimental points
22 7.2.4 Definition of outer limits for best-fit windows and evaluation of the inverse best-fit parabola on the “bell-shaped curve”
24 8 Documentation
9 Test report
25 Annex A (normative) Second derivative and “filtered” second derivative
27 Annex B (normative) Calculation of the width of the fit window
28 Annex C (normative) Evaluation of the inverse best-fit parabola on the “bell-shaped curve”
30 Annex D (normative) Application/Measurement of grid — Evaluation with magnifying glass or microscope
31 Annex E (informative) Tables of experimental data for validation of calculation programme
32 Annex F (normative) Representation and mathematical description of FLC
33 Annex G (informative) Examples of critical section line data
34 Annex H (normative) Flowchart from measured strain distributions to FLC values
36 Bibliography

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BS EN ISO 12004-2:2021
$167.15