ASTM E3370-24 PDF

Full title and description

Standard Practice for Matrix Array Ultrasonic Testing of Composites, Sandwich Core Constructions, and Metals — ASTM E3370-24. This practice provides recommended procedures, inspection modes (pulse-echo, through-transmission), data presentation (A-, B-, C-scans, 3D renderings), and guidance for using matrix array ultrasonic testing (MAUT) for detection and evaluation of defects, thickness measurement, and corrosion/adhesive-bond inspections in composites, sandwich constructions, and metals.

Abstract

ASTM E3370-24 establishes practice-level guidance for the application of matrix array ultrasonic testing (MAUT) — including straight-beam longitudinal-wave examinations and combined pulse-echo/through-transmission methods — to locate, characterize, and quantify damage, discontinuities, and thickness variations in polymer matrix composites, sandwich core constructions, and metallic components. The practice emphasizes real-time C-scan capability, near-surface resolution, and suitability for both production acceptance and in-service inspections.

General information

• Status: Active (current practice).
• Publication date: January 6, 2024 (E3370-24); ASTM record notes a later administrative update in July 2024.
• Publisher: ASTM International.
• ICS / categories: Non-destructive testing (ICS 19.100); additional classification references include 49.025.01.
• Edition / version: E3370-24 (2024 edition).
• Number of pages: 14 pages.

Scope

This practice covers the application of matrix array ultrasonic testing (MAUT) for straight-beam longitudinal-wave examinations and related modes to detect and evaluate: bulk defects and delaminations in monolithic polymer-matrix composites, disbonds/adhesive bond quality in metals and sandwich constructions, thickness variations and corrosion in metals, coatings, and defects in filament-wound composites. It is intended for acceptance testing per contractual criteria and for in-service inspection to detect and evaluate damage; both unpressurized and, with precautions, pressurized components are addressed. The practice also describes data formats and the advantages of MAUT (real-time C-scans, toggling between modes, near-surface resolution).

Key topics and requirements

• Fundamentals and recommended procedures for Matrix Array Ultrasonic Testing (MAUT), including transducer characteristics and array operation.
• Use of pulse-echo and through-transmission ultrasonic (TTU) modes; guidance on toggling and combined use.
• Data presentation and interpretation: A-, B-, C-scans and three-dimensional renderings; guidance for C-scan acquisition and near-surface resolution considerations.
• Procedures for detecting and quantifying defects: delamination, disbond, porosity, foreign-object debris (FOD), and corrosion-related loss of material.
• Calibration, acceptance criteria concepts (as typically specified by purchase order or contract), and suitability for production and in-service inspections.
• References and cross-references to conventional ultrasonic practices (for example, Practice E2580 for laminate composites and Practice E114 for pulse-echo straight-beam UT).

Typical use and users

Primary users include NDT/NDE engineers and technicians, quality assurance personnel, inspection service providers, and materials engineers in aerospace, automotive, marine, wind-energy, and defense industries. Common uses are incoming and final acceptance inspection of composite and sandwich parts, in-service corrosion checks on metallic structures, adhesive-bond verification, production process control, and forensic investigation of damage. Organizations using MAUT for primary structures and safety-critical components will apply this practice as part of inspection procedures and procurement requirements.

Related standards

Practice E2580 (Ultrasonic inspection of laminate composites), Practice E114 (Ultrasonic testing by pulse-echo straight-beam longitudinal waves), and other ASTM nondestructive-testing practices and guides referenced within E3370-24 for calibration, equipment selection, and interpretation. Users should consult those practices when using conventional UT techniques in conjunction with MAUT.

Keywords

Matrix array ultrasonic testing, MAUT, composites, sandwich core, honeycomb, laminates, delamination, disbond, corrosion, porosity, pulse-echo, through-transmission (TTU), C-scan, A-scan, B-scan, nondestructive evaluation (NDE), nondestructive testing (NDT), adhesive bond, thickness measurement.

FAQ

Q: What is this standard?

A: ASTM E3370-24 is a 2024 practice from ASTM International that provides recommended procedures for matrix array ultrasonic testing (MAUT) of composites, sandwich core constructions, and metals, covering inspection modes, data presentation, and evaluation guidance.

Q: What does it cover?

A: It covers MAUT techniques (straight-beam longitudinal wave, pulse-echo, TTU), scanning and data-display formats (A-, B-, C-scans, 3D), calibration and inspection guidance for detecting delamination, disbond, porosity, thickness variation, and corrosion, and guidance on applying the practice for both acceptance and in-service inspections.

Q: Who typically uses it?

A: NDT/NDE technicians and engineers, QA/QC staff, inspection contractors, composite manufacturers, and materials engineers in industries that use fiber-reinforced composites, sandwich constructions, or require corrosion/thickness monitoring of metallic parts.

Q: Is it current or superseded?

A: E3370-24 is the current active practice published in 2024 (designation E3370-24). ASTM records indicate the practice is active and was updated in 2024. Users should verify any later revisions or corrigenda before use.

Q: Is it part of a series?

A: It is part of ASTM’s body of nondestructive-testing practices and is cross-referenced with related UT practices (for example E2580 and E114). It complements other ASTM NDE/UT standards rather than forming a numbered series.

Q: What are the key keywords?

A: Matrix array ultrasonic testing (MAUT), composites, sandwich core, delamination, disbond, corrosion, C-scan, pulse-echo, through-transmission, nondestructive evaluation.