GB/T 33820-2025Metallic materials - Ductility testing - High speed compression test for porous and cellular metals (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document replaces GB/T 33820-2017 "Metallic materials - Ductility test - High-speed compression test method for porous and cellular metals" Compared with GB/T 33820-2017, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

a) Added symbols and instructions (see Chapter 4);

b) Deleted "When the porosity is obviously uneven, the multiple may be appropriately increased" [see 7.2b), Note to 6.2b) of the 2017 edition];

c) The regulations on the use of adhesives have been changed [see 8.2b), 7.2b of the 2017 edition];

d) The coordinate axis symbols of all graphs were adjusted and modified;

e) The unit of compressive stress has been changed (see 10.2, 9.2 of the 2017 edition).

This document is equivalent to ISO 17340:2020 "Metallic materials – Ductility tests – High-speed compression test method for cellular and cellular metals" Law".

The following minimal editorial changes have been made to this document.

--- Added notes on the simultaneous acquisition of compression force and displacement in the drop weight impact test step (see 8.2).

Introduction

Porous and honeycomb metals have excellent properties due to their unique cellular pore structure.

High-speed compression characteristics are essential for industrial design when designing impact-absorbing components.

The high-speed compression deformation is obviously different from its static compression characteristics. Therefore, the static compression deformation test method is not suitable for high-speed compression test.

Standardized test methods for high-speed compression of cellular and cellular metal materials are imperative.

Ductility test of metal materials High-speed compression test method for cellular and cellular metals

1 Scope

This document specifies the method for high-speed compression testing of cellular and cellular metals at room temperature.

This document applies to cellular and cellular metals having a porosity of 50% or more.

The speed range of this test method is 0.1m/s~100m/s (when the sample height is 100mm, the initial strain rate is 1s-1~103s-1).

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

Note. GB/T 13634-2019 Calibration of standard dynamometers for uniaxial testing machines for metallic materials (ISO 376:2011, IDT) system) Note. GB/T 16825.1-2022 Inspection and calibration of static uniaxial testing machines for metallic materials Part 1: Force measurement of tension and/or compression testing machines System verification and calibration (ISO 7500-1:2018, IDT) larmetals) Note. GB/T 31930-2015 Metallic materials - Ductility tests - Compression test on cellular and cellular metals (ISO 13314:2011, IDT) ISO 80000-1 (Quantitiesandunits-Part 1: General)

3 Terms and Definitions

For the purposes of this document, the terms and definitions defined in ISO 13314 and the following apply.

Test speed when applying pressure to the specimen, the speed at which the pressure plate moves when it contacts the specimen.

Initial strain rate the value obtained by dividing the test speed by the initial height of the specimen.

sampling frequency

The number of measurement data samples per unit time.