ASTM D732-24 PDF

Full title and description

ASTM D732-24 — Standard Test Method for Shear Strength of Plastics by Punch Tool. This method defines a punch (shear) test for determining comparative shear strength of plastic sheets, plates, and molded shapes using punch-type tooling; results are intended primarily for material comparison and screening rather than as a single definitive design property.

Abstract

This standard specifies the apparatus, specimen form, test procedure, and calculation for reporting shear strength obtained by punching a specimen with a cylindrical punch through a die. The method produces a shear strength value calculated from the peak load and the sheared edge area (punch circumference × specimen thickness) and notes limitations related to stress concentrations and thickness effects.

General information

• Status: Active (current designation D732-24, active as of August 26, 2024).
• Publication date: Published in 2024 (issue dated August 1, 2024; updated/confirmed August 26, 2024).
• Publisher: ASTM International (American Society for Testing and Materials).
• ICS / categories: 83.080.01 — Plastics (general).
• Edition / version: D732-24 (2024 edition).
• Number of pages: 4 pages. (DOI: 10.1520/D0732-24).

Scope

This test method covers shearing plastics in the form of sheets, plates, and molded shapes with thicknesses from 1.27 to 12.7 mm (0.050 to 0.500 in.). It provides comparative shear strength values useful for material selection and screening, and it emphasizes that results are influenced by specimen geometry, tooling, and shear rate and therefore may not represent end-use performance without further analysis.

Key topics and requirements

• Specified specimen form and thickness range (1.27–12.7 mm / 0.050–0.500 in.).
• Punch-and-die tooling geometry (cylindrical punch; defined punch diameter and die clearance) and fixture alignment requirements.
• Test machine requirements (controlled crosshead speed and calibrated load measurement consistent with referenced procedures).
• Procedure for recording peak load and calculating shear strength as peak load divided by sheared edge area (punch circumference × thickness).
• Notes on limitations: stress concentrations at the punch edge, thickness dependence, and advisories that the method is comparative rather than a universal design value for shear strength.

Typical use and users

Used by materials laboratories, quality-control engineers, R&D teams, and manufacturers in plastics, automotive, aerospace interiors, consumer products, and packaging to compare shear resistance of candidate materials, evaluate effects of formulations or processing, and screen materials during development. Test labs and fixture manufacturers also use the method to design compliant punch/shear fixtures.

Related standards

Commonly referenced documents and related standards include ASTM D4000 (classification of plastics materials), ASTM D5947 (dimensions of solid plastics specimens), ASTM D618 (conditioning of plastics for testing), ASTM D883 (terminology for plastics), and ASTM E4 (calibration of force-measuring systems). These references and cross-references are noted in the D732-24 bibliographic and normative sections.

Keywords

punch shear, shear strength, plastics testing, punch tool, shear fixture, specimen thickness, ASTM D732-24, material screening

FAQ

Q: What is this standard?

A: ASTM D732-24 is the 2024 edition of the Standard Test Method for Shear Strength of Plastics by Punch Tool, which defines a punch (shear) test for plastics.

Q: What does it cover?

A: It covers test apparatus, specimen form and thickness (1.27–12.7 mm), test procedure, data recording, and calculation of shear strength from peak load and sheared edge area, with guidance on limitations and appropriate uses.

Q: Who typically uses it?

A: Materials labs, R&D engineers, quality control departments in plastics-using industries (automotive, aerospace interiors, consumer products, packaging), and test-fixture manufacturers.

Q: Is it current or superseded?

A: Current — the active designation is D732-24 (2024). The document was published in 2024 and is listed as active (last update recorded in August 2024). Users should always confirm the status with ASTM for the very latest updates.

Q: Is it part of a series?

A: It is a standalone ASTM test method but is part of the broader body of ASTM plastics test standards and frequently cross-referenced with other plastics and testing standards for specimen preparation, conditioning, and machine calibration.

Q: What are the key keywords?

A: Punch shear, shear strength, plastics, shear test, fixture, ASTM D732-24.