ASTM E643 is a standard test method used to compare the stretch formability of metallic sheet by pushing a spherical punch into a clamped specimen until cracking occurs. It is commonly used in sheet-metal qualification and process development when biaxial stretching behavior is a key concern.
If you need help matching ASTM E643 to your sheet thickness range, material type, or the right end-point detection approach, talk with our team.
ASTM E643 — Standard Test Method for Ball Punch Deformation of Metallic Sheet Material
ASTM E643 defines a lab procedure for running a ball punch deformation test on metallic sheet materials intended for forming applications. The reported outcome is typically a cup height (or equivalent depth at fracture) that helps compare sheet stretchability under a predominantly biaxial stretching condition.
This method is often referenced as a standardized alternative to older “cup” style formability testing where key parameters were left to the lab’s discretion.
Quick Definition
In plain terms: Clamp a sheet specimen, drive a spherical punch into it, and measure the deformation at the chosen end point (commonly when cracking occurs) to compare stretch formability.
What This Standard Covers
ASTM E643 covers the ball punch deformation test procedure for metallic sheet used in forming applications.
Typical thickness range: The scope applies to sheet thicknesses from about 0.008 in. to 0.080 in. (0.2 mm to 2.0 mm).
What it does (and does not) do: It provides a comparative, controlled way to rate sheet stretch formability, but it is not a direct simulation of every production forming condition.
Why This Standard Matters in Testing
Many sheet-forming operations involve significant stretching, not just uniaxial tension. ASTM E643 is useful because the deformation mode in the test is predominantly biaxial stretching, which can make it a practical screening tool when comparing candidate sheet materials for stretch-driven forming.
Results can be sensitive to practical setup factors such as hold-down/clamping force, lubrication, and how the test end point is determined. For purchasing and inter-lab comparisons, the key is controlling those variables to get repeatable, comparable cup-height results.
Common Materials, Product Types, or Applications Covered
ASTM E643 is used for metallic sheet intended for forming, where stretch formability is a concern.
Common examples: general sheet and strip used in stamped or formed components, draw/forming development work, incoming material comparisons, and process change evaluations where a quick formability check is needed.
Common Test or Verification Workflow
A typical ASTM E643 workflow focuses on consistent setup and end-point definition so cup height can be compared across lots or materials.
- Select representative sheet specimens within the thickness range covered by the standard.
- Clamp the specimen in the ball-punch tooling with a controlled hold-down condition.
- Apply lubrication and follow the standard’s guidance for consistent friction control.
- Drive the spherical punch to the specified end point (commonly associated with cracking) and record the resulting cup height (and any additional required outputs, depending on the cited edition).
- Report results with enough setup detail (tooling and end-point approach) to support comparisons.
Equipment Commonly Used for This Standard
ASTM E643 is tooling-driven: the key requirement is a controlled ball-punch fixture and a machine capable of applying the required load and stroke smoothly while capturing the end point consistently.
Common equipment: a universal testing machine or press with appropriate force capacity, ball punch deformation tooling (punch, die, and clamping/blank-holder components), lubrication control, and a measurement approach for cup height (and/or displacement) at the defined end point.
Equipment selection caution: Because results are influenced by hold-down force and lubrication, labs commonly focus on fixtures and controls that can set and repeat those conditions reliably, not just maximum force.
How to Read This Designation or Revision
Designation: “ASTM E643” identifies the ball punch deformation test method for metallic sheet.
Revision year: When cited as ASTM E643-YY (for example, E643-24), the suffix indicates the year of the referenced edition. Test setup details and reporting expectations can vary by edition, so purchase specifications and lab instructions should cite the full designation including the year.
Format note: In some catalogs and digital listings, you may see “E0643” used alongside “E643” for the same document family; always align on the exact cited edition used in your drawing, PO, or quality plan.
Related Standards, Methods, or Frameworks
ASTM E643 is commonly discussed alongside other sheet formability “cup” or indentation-style methods. When customers need to harmonize global requirements, a frequently compared reference is the Erichsen cupping test standard (for example, ISO 20482), which uses different tooling geometry and reporting conventions.
Get help configuring equipment for ASTM E643
If you are selecting a test frame/press and ball-punch tooling, or you need to standardize clamping force and end-point detection for repeatable E643 results, you can request a detailed quote for an equipment package matched to your material range and lab workflow.