What question did this study set out to answer?

The study aims to investigate how variations in ligament length affect the energy absorbed during Charpy impact testing.

March 7, 2026

Influence of Ligament Length and Corresponding Tolerances on the Results of Charpy Impact Tests

Key Points

The study aims to investigate how variations in ligament length affect the energy absorbed during Charpy impact testing.
Examined multiple Charpy specimens with variations in ligament length.
Conducted tests at three distinct energy levels: low, high, and super-high.
Performed statistical analyses on the energy absorption results.
Significant differences in absorbed energy based on ligament length were observed.
Results support revising ASTM standards for consistency with ISO 148-1.
Tolerances for ligament length are proposed to be adjusted from ±0.025 mm to ±0.075 mm.

Abstract

ABSTRACT The most popular international test standards for Charpy testing, namely ASTM E23-25, Standard Test Methods for Notched Bar Impact Testing of Metallic Materials, ASTM A370-24a, Standard Test Methods and Definitions for Mechanical Testing of Steel Products, and ISO 148-1:2016, Metallic Materials—Charpy Pendulum Impact Test—Part 1: Test Method, prescribe significantly different tolerances for the specimen ligament length, ranging from ±0.025 mm (ASTM E23) to ±0.01 mm (ASTM A370). The study detailed in this article investigated the influence of ligament length on the absorbed energy obtained from testing reference Charpy specimens at three energy levels (low, high, and super-high). The results obtained and the outcomes of multiple statistical analyses conducted on them support the proposal to revise the ASTM standards to make them consistent with each other and with ISO 148-1 (ligament length: 8 mm ± 0.075 mm).

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Cite This Study

Enrico Lucon (Wed,) studied this question.

synapsesocial.com/papers/69abc1b45af8044f7a4eaab5 https://doi.org/https://doi.org/10.1520/jte20250268

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