ASTM 3370-24: Standard Practice for Matrix Array Ultrasonic Testing of Composites, Sandwich Core Constructions, and Metals

ASTM E3370-24: Overview

Key Features of ASTM E3370-24

Scope and Application

– ASTM E3370-24 covers procedures for MAUT of monolithic composites, composite sandwich constructions, and metallic test articles. These procedures can be used throughout the life cycle of a part, including product and process design optimization, online process control, post-manufacturing inspection, and in-service inspection.

Techniques and Procedures

MAUT TRMs in Pulse-Echo and Through Transmission configuration

– The standard includes two main procedures: Procedure A (Pulse Echo) and Procedure B (Through Transmission).

– Procedure A (Pulse Echo) This involves a single matrix array transducer transmitting and receiving longitudinal waves. It requires access to only one side of the test article and can be conducted manually or automatically.

Detection of Delamination in Flat Panel Carbon-fiber Reinforced Composite Using Matrix Array Ultrasonic Testing Showing Typi
cal A-, B- and C-Scans and A Three-dimensional Rendering (Pulse-Echo Method)

– Procedure B (Through Transmission): This involves two transducers, one transmitting and the other receiving longitudinal waves. It requires access to both sides of the test article and is typically used for more comprehensive inspections.

Detection of Disbond in A Sandwich Construction Consisting of A Graphite Fiber Reinforced Facesheet and An Aluminum Hon
eycomb Core Using Matrix Array Ultrasonic Testing (Through-Transmission Mode)

Capabilities and Benefits

– MAUT provides near-surface resolution and detection of small discontinuities comparable to phased array transducers. It offers real-time C-scan data, which facilitates data interpretation and shortens inspection time.

– The technique is particularly useful for inspecting multi-ply carbon-fibre reinforced laminates used in primary aircraft structures.

Types of Flaws Detected

– The standard addresses various types of flaws and discontinuities, including interply delaminations, foreign object debris (FOD), inclusions, disbond/un-bond, fibre debonding, fibre fracture, porosity, voids, impact damage, thickness variation, and corrosion.

Applications

– ASTM E3370-24 is applicable to a wide range of industries, including aerospace, automotive, and construction. It ensures that materials meet the required acceptance criteria, enhancing safety and reducing the need for rework and repairs.

Conclusion

ASTM E3370-24 represents a significant advancement in the field of ultrasonic testing, offering enhanced capabilities for detecting and evaluating damage in composites, sandwich core constructions, and metals. Its comprehensive guidelines and versatile procedures make it an invaluable tool for ensuring the quality and reliability of materials across various industries.