BS ISO 23598:2021 pdf download – Mechanical joining of sheet materials — Destructive testing of joints — Specimen dimensions and procedure for mechanized peel testing of single joints
This document specifies the geometry of test specimens and the testing procedure for mechanized peel testing of single mechanical joints on single-lap test specimens up to a single sheet thickness of 4,5 mm.
The term “sheet”, as used in this document, includes extrusions and cast materials.
The purpose of the mechanized peel tests is to determine the mechanical characteristics and the failure modes of the joints made with different joining methods.
This document does not apply to civil engineering applications such as metal buildings and steel constructions which are covered by other application standards.
NOTE For mechanized peel testing of resistance spot, seam and embossed projection welds, see ISO 14270
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1: Tension/compression testing machines — Calibration and verification of the force-measuring system
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
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mechanized peel strength
F max
maximum peel force (3.2) obtained from mechanized peel testing
peel force
force/load which is applied to the test specimen during mechanized peel testing
slippage force
F sl
peel force (3.2)/load at which slippage occurs if the phenomenon is observed during testing
4 Test pieces and test specimens Table 1 and Figure 1 give the dimensions and form of test coupons and test specimens for mechanized peel testing, and the location of mechanical joint. The positional accuracy of the mechanical joints on the test specimen shall be ± 1 mm in every direction.
The test specimen for mechanical joints shall be produced as a single joint specimen as shown in Figure 1 b), which is made of two coupons shown in Figure 1 a), and then the mechanized peel test specimen shall be mounted on a tensile test machine as shown in Figure 1 c).
In the case of unequal sheet thicknesses, the test specimen dimensions shall be based on the thinner sheet. Mechanized peel testing shall be made by the procedure specified in Clause 5 and Clause 6.
The tolerances on the dimensions shall be in accordance with Table 2.
5 Preparation of mechanized peel test specimens
5.1 General
The mechanized peel test specimens for mechanical joints are recommended to be made in the following sequence, so that the test specimens can be tested using a tensile test machine;
Bending ⟶ Mechanical joining ⟶ Mechanized peel testing
The sequence is called “joining-after-bending process”.
NOTE In resistance spot welding, the bending-after-welding process (Joining ⟶ Bending ⟶ Mechanized peel testing) can be used, but in the case of mechanical joining, some fasteners cannot be tested using this sequence as the fastener interferes with the clamping face for bending after joining, or the clamping device can influence the joint part properties.
5.2 Bending procedure for preparation of peel test specimens
The test coupons shall be bent before mechanical joining as shown in Figure 2.
The recommended set-up conditions of jigs for bending with a press brake are shown in B.1.
NOTE When setting the value l b = a as shown in Figure 2, the maximum error in the flange length is less than ±0,5 mm if r = 2t and t ≤ 4,5 mm (see detail in Annex C).BS ISO 23598 pdf download.