ISO 148-1 Charpy Pendulum Impact Test (Metals) — Test Method

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ISO 148-1 is the core Charpy pendulum impact method for metallic materials, measuring the energy absorbed when a notched test piece is broken by a swinging pendulum. To match this to your program, talk with our team.

What ISO 148-1 Covers

It defines the V-notch Charpy specimen, the striker and support geometry, and how absorbed energy is measured and reported. It is the international basis for metal toughness acceptance across temperatures.

How the Test Is Run

The pendulum is raised to a set height, released to strike the notched specimen at the base of its swing, and the energy absorbed in fracture is read from the loss of pendulum height. Tests are often run at controlled low temperatures.

Why It Matters

Charpy energy is a primary toughness criterion for structural and pressure-retaining steels. A verified machine and correctly prepared, correctly notched specimens are what make the results comparable and defensible.

Reading the Designation

Cited as ISO 148-1 with its edition year. Confirm the edition and the specimen or notch requirements before finalizing fixtures and reporting. To configure an impact setup, request a quote.

Related Standards

ASTM E23 is the ASTM Charpy method, ISO 148-2 verifies the machine, and DIN EN ISO 148-1 is the German adoption.

Request a Quote

Setting up Charpy impact testing to ISO 148-1? Request a quote and our team will help you build a system matched to your specimen type and test temperature.

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Set up ISO 148-1 testing with TensileMill CNC

From specimen preparation to the test itself, TensileMill CNC supports the full ISO 148-1 testing chain. That typically means CNC systems for flat and round impact specimen preparation with precision notching. Send us your specimen types and target standards, and we will help you spec the right system.