ASTM E2298 Instrumented Impact Testing of Metallic Materials

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ASTM E2298 — Standard Test Method for Instrumented Impact Testing of Metallic Materials

ASTM E2298 dedicated to instrumented Charpy V-notch (CVN) and miniaturized Charpy V-notch (MCVN) impact tests for metallic materials. It supplements the conventional pendulum impact standard ASTM E23 by capturing real-time dynamic signals during impact. Instead of only obtaining a single absorbed energy value, this standard extracts force, displacement and segmented energy parameters to analyze the full fracture process.

It governs instrumented impact tests for two specimen types: standard Charpy V-notch (CVN) and miniaturized Charpy V-notch (MCVN) metallic specimens. It defines unified requirements for measurement hardware, signal acquisition, data processing, curve classification and result evaluation. It aligns with ASTM E23 (conventional notched bar impact) and ASTM E2248 (miniaturized impact test). This standard does not cover tests below cryogenic temperature limits and excludes safety responsibility for users, who shall establish on-site safety protocols accordingly.

Test Principle

The test follows the basic pendulum impact setup of ASTM E23: a notched specimen is simply supported on two anvils and fractured by a swinging pendulum. Differing from conventional tests, the pendulum striker is equipped with sensors (strain gauges, piezoelectric load cells or accelerometers) to continuously record voltage signals throughout the impact.

Convert real-time voltage data into force-time curves via calibrated signal conditioning.

Calculate striker velocity and specimen bending displacement through double numerical integration of force-time data, then derive the force-displacement curve.

Compute segmented and total absorbed energy by integrating the area under the force-displacement curve.

Extract characteristic force, displacement and energy values from curve inflection points to distinguish elastic deformation, general yielding, unstable crack initiation and crack arrest stages. This reveals the complete dynamic fracture mechanism of materials under high strain rates, rather than just a single total energy value.

Specific test method(s) covered

Method A. Instrumented CVN (dominant)

Standard Charpy V‑notch geometry 10 mm × 10 mm × 55 mm, 45° notch, 2 mm root radius, span 40 mm — all per E23.

Instrumented striker frequently referenced to ISO 14556 geometry (2 mm striking-edge radius). The standard notes data show striker geometry influence on instrumented forcesis not very significant (Note 1), but you still report which striker you used.

Method B. Instrumented MCVN (miniaturized)

Specimen and supports per ASTM E2248 (smaller cross-section, shorter span).

Same force–time → F(s) pipeline, but higher frequency requirements because the event is faster and displacements/forces are smaller.

There is no Izod and no U‑notch in E2298 — this is a V‑notch-only instrumented method.

Test Specimen Requirements

Standard Charpy V-Notch (CVN) Specimen

Dimensions: 55 mm × 10 mm × 10 mm square bar, consistent with ASTM E23.

Notch parameters: 45° included angle, 2 mm depth, 0.25 mm root radius; strict dimensional tolerances and surface finish requirements apply.

Surface quality: Critical notch area surface roughness meets ASTM E23 provisions; no machining scratches on the notch root to avoid abnormal stress concentration.

Miniaturized Charpy V-Notch (MCVN) Specimen

Specially designed for scenarios with limited material sampling volume (e.g., thin plates, small components after service).

Multiple standardized mini sizes are specified.

Key note: MCVN test results cannot be directly compared with standard CVN data; dedicated correlation research is required for data conversion.

General Specimen Rules

Specimen machining, heat treatment and marking comply with ASTM E23.

For temperature-controlled tests, the specimen temperature at impact must be strictly controlled to meet target tolerance.

Specimens with visible defects, unqualified notches or surface damage are prohibited from testing.

Test Equipment of ASTM E2298 Metal Instrumented pendulum impact test

Charpy Pendulum Instrumented Impact Testing Machine	The UnitedTest Instrumented Impact Testing machine adopts advanced foreign technology and cooperate with National Engineering & Physical research institute to developed a new products. Complying with ASTM E23, equipped with standard strikers (2 mm radius is recommended for instrumented tests) and matched anvils.
Instrumented Striker	Installed with strain gauges, piezoelectric load cells or accelerometers to collect dynamic force signals. The structure shall minimize interference from asymmetric loading.
Signal & Data Acquisition System	Frequency requirement: Minimum 100 kHz response frequency for standard CVN tests; 250 kHz mandatory for MCVN tests (100 kHz is acceptable if only total energy is measured). Sampling & storage: Minimum 10-bit analog-to-digital converter (12-bit recommended); sufficient data storage to record full impact signals.
Temperature Conditioning Devices	Temperature conditioning devices (liquid/gas bath), insulated transfer tongs, and tools for measuring shear fracture appearance.

Key Test Parameters & Mandatory Stipulations:

1. Impact Velocity

Calculated by the pendulum drop height. The velocity range follows ASTM E23; excessive velocity will cause severe signal oscillation and distort data.

2. Characteristic Parameters (Core Evaluation Indicators)

Extracted from force-displacement curves, divided into three categories:

Force Parameters: General yield force (F_gy), maximum force (F_m), unstable (brittle) crack initiation force (F_bf), crack arrest force (F_a).

Displacement Parameters: Displacement corresponding to each force (s_gy, s_m, s_bf, s_a) and total displacement (s_t).

Energy Parameters: Partial energy up to maximum force (W_m), partial energy up to crack initiation (W_bf), crack arrest energy (W_a), total instrumented absorbed energy (W_t).

3. Force-Displacement Curve Classification

Three typical curve types correspond to different fracture modes:

Type A (Lower shelf): Dominated by brittle unstable crack propagation; typical for low-toughness materials.

Type B (Transition zone): Mixed stable ductile and unstable brittle crack growth (ductile-brittle transition state).

Type C (Upper shelf): Only stable ductile crack propagation; typical for high-toughness materials.

ASTM E2298 Instrumented Impact Testing of Metallic Materials

Characteristic Force-Displacement Curves and Definitions of Characteristic Forces

Standard Test Procedures of ASTM E2298 Instrumented Impact Test

Pre-Test Preparation: Inspect the pendulum machine and instrument system; complete system static calibration and energy consistency verification. Check specimen dimensions, notch quality and surface condition.

System Debugging: Set sampling frequency, storage parameters and signal channels for the data acquisition system; perform no-load swing to check zero drift and signal stability.

Specimen Temperature Conditioning: Place specimens in liquid or gas medium and hold for the specified time to reach the target temperature.

Specimen Placement & Impact: Use qualified tongs to transfer specimens within the time limit and place them accurately on anvils. Release the pendulum; the system automatically records full voltage/force-time signals.

Data Processing: Convert signals to force-displacement curves, filter oscillations, fit curves and extract all characteristic force, displacement and energy values. Classify curve types.

Auxiliary Inspection: Measure shear fracture appearance (SFA) via standard methods or estimate SFA using empirical formulas from curve parameters.

Result Sorting & Report Generation: Record all test information and finish the formal test report.

Industrial Application Fields

Metallurgical R&D: Study ductile-brittle transition of steels and alloys; optimize smelting, rolling and heat treatment processes.

Energy & Pressure Equipment: Evaluate low-temperature toughness and dynamic fracture performance of pressure vessel steel, pipeline steel and nuclear power structural materials.

Automotive & Transportation: Support vehicle crash safety design; analyze impact fracture of chassis and body components.

Aerospace & Defense: Characterize dynamic toughness of aviation aluminum alloys, titanium alloys and high-strength structural steels under extreme conditions.

Related Test Standard:

ISO 148-1	Metallic materials - Charpy pendulum impact test - Part 1: Test method
ASTM E23	Standard Test Methods for Notched Bar Impact Testing of Metallic Materials
ASTM E2298	Standard for instrumented impact testing, matching conventional impact tests in ASTM E23 to collect force-displacement curves.
AASHTO T 266	Standard Method of Test for Notched Bar Impact Testing of Metallic Materials (CVN)
JIS Z 2242	Method for Charpy pendulum impact test of metallic materials
KS B 0810	Method of impact test for metallic materials
GB/T 229	Metallic materials—Charpy pendulum impact test method
GB/T 19748	Metallic materials—Charpy V-notch pendulum impact test—Instrumented test method
ISO 14556	Metallic materials — Charpy V-notch pendulum impact test — Instrumented test method
EN 10045-1	Charpy Impact Test for Metallic Materials - Test Method
ISO 148-2	Metallic materials - Charpy pendulum impact test - Part 2: Verification of testing machines
ISO 148-3	Metallic materials. Charpy pendulum impact test. Preparation and characterization of Charpy V-notch test pieces for indirect verification of pendulum impact machines
ISO 148-4	Metallic materials. Charpy pendulum impact test - Testing of miniature Charpy-type V-notch test pieces
ASTM E2248	Standard Test Method for Impact Testing of Miniaturized Charpy V-Notch Specimens

Instrumented impact tester is adopts advanced foreign technology and cooperate with China National Engineering & Physical research institute to developed a new products. Instrumented impact tester is measuring the impact value, collect and analysis the impact process data, figure energy curve.

Electric impact specimen U/V notching machine is a specialized specimen preparation device for metal Charpy pendulum impact tests. It is driven by a motor and lead screw, and uses forming cutting tools to cut a V-shaped or U-shaped notch in a single pass, meeting standards such as GB/T 229, ISO 148,

CST-50 projector is a supplemental equipment for impact test, mainly used to check the accuracy of impact specimen U/V notch. Put the notched specimen on projector working table, multiple 50* and compare the projection image with standard plate, then identify the quality of impact specimen notch.

DWC low temperature chamber is a supplemental equipment for impact test under low temperature. Use imported high quality compressor to refrigerate, single-chip micro processor control, auto control temperature, timing, alarm etc.; Refrigeration fast, big volume.

Impact Tester is mainly used to determine the anti-impact capability of ferrous metal materials with high toughness, especially for steel and iron and their alloy, under dynamic load. This series tester is operated semi-automatically.

Q1: What is ASTM E2298-25?

A: ASTM E229-25 is the latest American standard for instrumented Charpy V-notch (CVN) and miniaturized Charpy V-notch (MCVN) impact tests for metallic materials. It is a supplementary standard to conventional impact standard ASTM E23, focusing on collecting dynamic force, displacement and continuous energy signals during impact to analyze the full fracture process of materials.

Q2: What is the difference between ASTM E2298 and conventional ASTM E23 impact test?

A: ASTM E23 only outputs a single total absorbed energy value. ASTM E2298 uses sensors and high-speed data acquisition systems to record real-time force-displacement curves. It can divide the fracture process into elastic deformation, yielding, crack initiation and crack arrest stages, and extract multiple characteristic parameters to reflect detailed dynamic fracture behavior.

Q3: Why is the ASTM E2298 test important for metallic materials?

A:It reveals the complete dynamic fracture mechanism, which cannot be reflected by single energy data, helping researchers study the intrinsic toughness and crack propagation rules of metals.

It accurately identifies the upper shelf, lower shelf and ductile-brittle transition zone of materials, effectively evaluating low-temperature brittleness and preventing catastrophic brittle failure of components.

It provides detailed dynamic mechanical parameters for crash safety, structural design and production process optimization in automotive, aerospace and energy industries.

It serves as a critical tool for component failure analysis, to distinguish ductile overload or brittle crack-induced failure.

It complements ASTM E23: conventional tests for routine quality control, while instrumented tests for advanced research and high-standard evaluation.

Q4: What materials does ASTM E2298 apply to? Can it test non-metals?

A: It is designed for all ferrous and non-ferrous metallic materials such as carbon steel, alloy steel, aluminum alloys, titanium alloys and powder metallurgy materials. It is not applicable to plastics, rubber and other non-metallic materials.

Q5: Can the data from ASTM E2298 be directly used for structural strength calculation?

A: No. The standard clearly states that the dynamic parameters and force-displacement curves obtained by this test are for material performance analysis only, and cannot be directly applied to the strength calculation and safety assessment of actual engineering structures.

Q6: What are the calibration requirements for the instrumented system?

A:Static calibration shall be conducted per ASTM E4. The error is ≤1% of full scale (10–50% range) and ≤2% of full scale (50–100% range).

Recalibration is mandatory after the striker is disassembled, repaired, or the machine is moved.

NIST-certified reference specimens can be used for indirect verification of the force measurement system.

Q7: How to estimate shear fracture appearance (SFA)?

A: The standard provides multiple empirical formulas to calculate the percentage of shear fracture via curve characteristic values, with a general error of about 20%. The optical measurement method specified in ASTM E23 is the preferred accurate way.

Q8: How to deal with incompletely fractured or ejected specimens?

A: Record the abnormal state in the test report. For incomplete fracture, define the end point of the curve according to the force returning to the baseline range.

Q9: Can the original test signal be filtered arbitrarily?

A: Post-processing filtering is allowed, but the original unfiltered signal must be retained for traceability.

Q10: What is the difference between ASTM E2298 and ISO 14556?

A: Main differences lie in curve naming, parameter definition, calibration tolerance and shear fracture calculation formulas. ASTM E2298 covers MCVN tests more comprehensively, while ISO 14556 has more detailed provisions for miniature specimen equipment.

Q11: Why does the force curve have obvious oscillations?

A: Common reasons: insufficient system sampling frequency, excessive impact velocity, loose machine components or unstable pendulum. It is necessary to optimize parameters or inspect the equipment.

Q12: Why are repeated test data scattered greatly?

A: Possible causes: incomplete system calibration, unstable specimen temperature, inconsistent notch quality or irregular specimen placement. Re-calibration and standardized operation are required.

Q13: Does ASTM E2298 support Izod impact tests?

A: No. This standard is limited to Charpy (CVN/MCVN) instrumented impact tests, and does not include Izod (cantilever beam) tests.

Q14: Can I use this test for very small specimens?

A: Yes. ASTM E2298 covers both standard CVN (10×10×55 mm) and MCVN (Miniaturized CVN) specimens per ASTM E2248. However, for MCVN, the frequency requirements jump to ≥250 kHz to capture the much faster events occurring in smaller, stiffer specimens. The standard warns that results from miniature specimens are not directly comparable to standard CVN results.

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