GB/T 31967.2-2015 English PDF

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GB/T 31967.2-2015: Test method for physical property of rare earth permanent magnetic materials -- Part 2: Determination of bending strength and fracture toughness
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Basic data

Standard ID: GB/T 31967.2-2015 (GB/T31967.2-2015)
Description (Translated English): Test method for physical property of rare earth permanent magnetic materials -- Part 2: Determination of bending strength and fracture toughness
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H14
Classification of International Standard: 77.120.99
Word Count Estimation: 10,118
Date of Issue: 2015-09-11
Date of Implementation: 2016-08-01
Quoted Standard: GB/T 4161-2007; GB/T 16825.1; YB/T 5349
Regulation (derived from): National Standard Announcement 2015 No.25
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This Standard specifies the rare earth permanent magnet material bending strength (��bb) and fracture toughness (KIC) measurement method. This Standard applies to brittle fracture of rare earth permanent magnet materials flexural strength and fracture toughness (KIC) is measured. Measurement range flexural strength: 20MPa ~ 2000MPa, fracture toughness (KIC) measurement range: 0.5MPa �� m1/2 ~ 50MPa �� m1/2.

GB/T 31967.2-2015: Test method for physical property of rare earth permanent magnetic materials -- Part 2: Determination of bending strength and fracture toughness

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Rare earth permanent magnet materials, physical performance test methods - Part 2. flexural strength and fracture toughness determination) ICS 77.120.99 H14 National Standards of People's Republic of China Rare earth permanent magnet materials, physical performance test method Part 2. flexural strength and fracture toughness determination Part 2. Determinationofbendingstrengthandfracturetoughness Issued on. 2015-09-11 2016-08-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 31967 "rare earth permanent magnet materials, physical performance test method" is divided into two parts. --- Part 1. Determination of the temperature characteristics of the magnetic flux; --- Part 2. flexural strength and fracture toughness determination. This section GB/T Part of 231,967. This section drafted in accordance with GB/T 1.1-2009 given rules. This part of the National Standardization Technical Committee of rare earth (SAC/TC229) and focal points. This section is responsible for drafting unit. Iron and Steel Institute. Participated in the drafting of this section. Beijing Nonferrous Metal Research Institute, Ningbo Institute of Material Technology and Engineering, Beijing Industrial the University. The main drafters of this section. Li Wei, Zhuming Gang, Lian Hua, FENG Hai-bo, Wang Kuaijie. Rare earth permanent magnet materials, physical performance test method Part 2. flexural strength and fracture toughness determination

1 Scope

This section provides a rare earth permanent magnet materials flexural strength (σbb) and fracture toughness (KⅠC) measurement method. This section applies to brittle fracture rare earth permanent magnet materials, flexural strength and fracture toughness (KⅠC) measurement. Determination of flexural strength of Fan Wai. 20MPa ~ 2000MPa, fracture toughness (KⅠC) measurement range. 0.5MPa · m1/2 ~ 50MPa · m1/2.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. KⅠC fracture toughness test method GB/T 4161-2007 metallic material plane strain Inspection and tension and (or) pressure testing machine force measuring system. GB/T 16825.1 of static uniaxial testing machines - Part 1 calibration YB/T 5349 metal material bending mechanical performance test method

3 Terms and Definitions

GB/T 4161-2007, YB/T 5349 defined by the following terms and definitions apply to this document. 3.1 Span span Ls Two samples from the bearing point bending test between devices, in millimeters (mm). 3.2 The maximum bending force themaximumforceinbending Fbb Bending before specimen fracture can bear the greatest bending force in Newtons (N). 3.3 Flexural strength bendingstrength σbb Bending to break specimen, the maximum bending stress by elastic bending stress formula calculated in megapascals (MPa). 3.4 The most vigorous themaximumforce Fmax When the fracture toughness test before specimen fracture can withstand the most vigorous, kilo Newtons (kN). 3.5 Fracture toughness fracturetoughness KⅠC Determination of the critical value of the stress intensity factor KⅠ, MPa · m1/2. Where Roman numerals Ⅰ, refers Ⅰ crack and the crack in the top level ......

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