BS EN ISO 12004-2:2021

What is ISO 12004-2 about? 

ISO 12004-2 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 1: The limitation in thickness of up to 4 mm is proposed, giving a maximum allowable thickness to the punch diameter ratio. 

NOTE 2: For ISO 12004-2 (concerning determination of forming-limit curves in laboratory), the following conditions are also of note. 

• Forming-limit curves (FLCs) are determined for specific materials to define the extent to which they can be deformed by drawing, stretching or any combination of drawing and stretching. This capability is limited by the occurrence of localized necking and/or fracture. Many methods exist to determine the forming limit of a material; but results obtained using different methods cannot be used for comparison purposes. 

• The FLC characterizes the deformation limit of a material in the condition after a defined thermo-mechanical treatment and in the analysed thickness. For a judgement of formability, the additional knowledge of mechanical properties and the material’s history prior to the FLC-test are important. 

Who is ISO 12004-2 for? 

ISO 12004-2 on the determination of forming-limit curves in the laboratory is beneficial for: 

• Test laboratories 
• Metallurgists 
• Electrochemical engineers 

Why should you use ISO 12004-2? 

A forming-limit diagram (FLD) is a diagram containing major/minor strain points.An FLD can distinguish between safe points and necked or failed points. The transition from safe to failed points is defined by the forming-limit curve (FLC). 

ISO 12004-2 is beneficial for the user as FLC is intended to represent the almost intrinsic limit of material in deformation assuming a linear strain path. To determine the FLC accurately, it is necessary to have as nearly linear a strain path as possible. 

To determine the forming limit of materials, two different methods are possible: 

• Strain analysis on failed press shop components to determine component and process dependent FLCs 
• Determination of FLCs under well-defined laboratory conditions 

Overall, ISO 12004-2 is useful as ISO 12004-2 provides details about Forming-limit curves (FLCs) which can help your business.