ASTM D6742/D6742M-23 PDF

Full title and description

ASTM D6742/D6742M-23 — Standard Practice for Filled-Hole Tension and Compression Testing of Polymer Matrix Composite Laminates. This practice provides instructions for adapting open‑hole tension and compression test methods to determine filled‑hole (fastener‑installed) tensile and compressive strengths of continuous‑fiber reinforced polymer matrix composite laminates that are symmetric and balanced in the test direction.

Abstract

This standard defines procedures and reporting requirements for filled‑hole tensile and compressive testing of polymer matrix composite laminates. It supplements existing open‑hole test methods by specifying how to prepare specimens containing a close‑tolerance fastener or pin in the hole, and how to record filled‑hole tensile (FHT) and filled‑hole compressive (FHC) strengths. The practice emphasizes repeatability by requiring that fastener selection, installation method, and hole tolerance be specified and reported, and it treats SI and inch‑pound units as separate, independent systems.

General information

• Status: Active
• Publication date: September 1, 2023
• Publisher: ASTM International
• ICS / categories: 83.120 (Reinforced plastics / composites testing)
• Edition / version: D6742/D6742M-23 (revises D6742/D6742M-17)
• Number of pages: 6

Scope

The practice provides instructions for modifying open‑hole tension and compression test methods to determine the filled‑hole tensile and compressive strengths of continuous‑fiber reinforced polymer matrix composite laminates that are symmetric and balanced with respect to the test direction. It supplements Test Methods D5766/D5766M (open‑hole tension) and D6484/D6484M (open‑hole compression) by covering specimens that contain a close‑tolerance fastener or pin installed in the hole. Several specimen parameters (fastener choice, installation method, hole tolerance, etc.) are not mandated by the practice and must be specified by the user to ensure repeatability. SI and inch‑pound values are treated independently.

Key topics and requirements

• Modification of open‑hole tension and compression test methods to accommodate a filled (fastener‑installed) hole.
• Measurement and definition of filled‑hole tensile strength (FHT) and filled‑hole compressive strength (FHC).
• Specification and reporting of fastener/pin selection, installation method, and hole tolerance to ensure repeatable results.
• Acceptable laminate forms: continuous‑fiber reinforced polymer matrix composites that are symmetric and balanced in the test direction (see clause on acceptable thicknesses and laminates).
• Test fixturing, alignment, and instrumentation considerations to avoid introducing spurious bending or load path effects.
• Separate handling of SI and inch‑pound units (each system is a standalone standard within the document).
• Reporting requirements and relationship to related test methods (D5766/D5766M and D6484/D6484M) and Guide D8509.
• Safety and user responsibility: the standard does not address all safety concerns; users must establish appropriate safety, health, and environmental practices.

Typical use and users

Used by composite materials test laboratories, aerospace and automotive materials engineers, design and structural analysts, quality assurance personnel, and research organizations to evaluate the strength of bolted or pinned joints in polymer matrix composite laminates. Typical applications include qualification testing for joint design, material selection, damage‑tolerance studies, and comparative performance testing of fastener systems in laminates.

Related standards

References and related ASTM standards include Test Methods D5766/D5766M (open‑hole tensile testing), D6484/D6484M (open‑hole compression testing), and Guide D8509. The practice was developed by ASTM Committee D30 (Subcommittee D30.05) and revises ASTM D6742/D6742M‑17.

Keywords

filled‑hole testing, filled‑hole tensile strength, filled‑hole compressive strength, bolted joints, fastener, pin, polymer matrix composites, continuous‑fiber laminates, open‑hole modification, tension testing, compression testing

FAQ

Q: What is this standard?

A: ASTM D6742/D6742M‑23 is a practice that defines how to modify open‑hole tension and compression tests to measure the tensile and compressive strengths of composite laminates containing a close‑tolerance fastener or pin in the hole.

Q: What does it cover?

A: It covers specimen preparation, test modification, measurement definitions (FHT and FHC), and reporting needs for continuous‑fiber reinforced polymer matrix laminates that are symmetric and balanced in the test direction. It supplements D5766/D5766M and D6484/D6484M.

Q: Who typically uses it?

A: Materials testing laboratories, composite manufacturers, aerospace and automotive engineers, structural analysts, and researchers performing qualification, comparative, or design‑support testing of bolted/pinned composite joints.

Q: Is it current or superseded?

A: It is current. The -23 edition was published September 1, 2023 and is the active revision, superseding ASTM D6742/D6742M‑17.

Q: Is it part of a series?

A: It belongs to the family of ASTM D30 composite test methods and specifically supplements the open‑hole test methods D5766/D5766M and D6484/D6484M. It was developed by Subcommittee D30.05 and is listed in ASTM Book of Standards volume for reinforced plastics.

Q: What are the key keywords?

A: Filled‑hole testing, bolted joints, fastener, composite laminates, filled‑hole tensile strength, filled‑hole compressive strength, tension testing, compression testing, polymer matrix composites.