GB/T 15825.8-2008 English PDF

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GB/T 15825.8-2008: Sheet metal formability and test methods -- Part 8: Guidelines for the determination of forming -- Limit diagrams
Status: Valid

GB/T 15825.8: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 15825.8-2008	329	Add to Cart	3 days	Sheet metal formability and test methods -- Part 8: Guidelines for the determination of forming -- Limit diagrams	Valid
GB/T 15825.8-1995	279	Add to Cart	3 days	Sheet metal formability and test methods--Forming limit diagram (FLD) test	Obsolete

Similar standards

GB/T 15055   GB/T 13916   GB/T 13914   GB/T 15825.3   GB/T 15825.4   GB/T 15825.2   

Basic data

Standard ID: GB/T 15825.8-2008 (GB/T15825.8-2008)
Description (Translated English): Sheet metal formability and test methods -- Part 8: Guidelines for the determination of forming -- Limit diagrams
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J32
Classification of International Standard: 77.040.10
Word Count Estimation: 14,143
Date of Issue: 2008-12-23
Date of Implementation: 2009-06-01
Older Standard (superseded by this standard): GB/T 15825.8-1995
Quoted Standard: GB/T 15825.2-2009; ISO 12004-1997; ISO/TR 14936-1998
Regulation (derived from): National Standard Approval Announcement 2008 No.21 (Total No.134)
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 method for laboratory determination of sheet metal forming limit diagram (forming limit diagrams, abbreviations FLD) is. This section applies to the thickness of the metal sheet 0. 20mm ~ 3. 00mm.

GB/T 15825.8-2008: Sheet metal formability and test methods -- Part 8: Guidelines for the determination of forming -- Limit diagrams

---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.
Sheet metal formability and test methods Part 8. Guidelines for the determination of forming Limit diagrams. ICS 77.040.10 J32 National Standards of People's Republic of China Replacing GB/T 15825.8-1995 Performance and test methods for metal sheet forming Part 8. Forming Limit Diagram (FLD) Determination Guide Posted 2008-12-23 2009-06-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Table of Contents

Introduction Ⅲ 1 Scope 1 2 Normative references 1 3 symbols, names and units 1 4 Test principle 2 5 Sample 2 6 strain analysis grid Preparation 3 7 die 3 Test conditions 3 8 9 test equipment and test machine 4 10 measured and calculated 4 11 test procedures and methods of operation 5 12 plotted Forming Limit Diagram 5 13 Test Report 6 Appendix A (informative) Analysis of the grid should change instructions 7 References 8

Foreword

GB/T 15825 "Performance and test methods for sheet metal forming" is divided into eight sections. --- Part 1. formability and indicators; --- Part 2. General test procedures; --- Part 3. drawing and drawing load test; --- Part 4. reaming test; --- Part 5. bending test; --- Part 6. Cone cup test; --- Part 7. Test lug; --- Part 8. Forming Limit Diagram (FLD) Determination Guide. This part of GB/T 15825 Part 8. This Part replaces GB/T 15825.8-1995 "Sheet metal formability and test methods - Forming Limit Diagram (FLD) tests." Section compared with the GB/T 15825.8-1995, major changes in the following. --- Added "directory" and "Introduction"; --- 1 title was changed to "Range"; --- Increasing the normative references ISO 12004.1997 and ISO /T R14936.1998; --- Modify the provisions of 4.1; --- Amend the provisions of 4.2 and note the contents; --- The name of Figure 1 was changed to "1 rigid Nakazima"; --- 4.3 modify the boot sentences and original content standards 4.3.1 and 4.3.2, and 4.3.1 and 4.3.2 is amended as 4.3 Column item a) and b), but also increased the column item 4.3c); --- Modify the provisions of 5.3; --- 6 title was changed to "6 grid strain analysis Preparation"; --- Modify the provisions of 6.1, and added note; --- Added Figure 2, after drawing number in ascending order along the row; --- Replace the contents of the original standard of Figure 2, and Figure 3 revised figure number; --- Modify the provisions of 6.3; --- Increased 7.1; --- Modify the original standard 7.1 and 7.2, and revised its provisions; --- Increased by 7.3, 7.2 Recursive original standard was 7.4; --- Original standard "8.1 Lubrication" to "8.1 Lubrication and contact conditions"; Add text "no special requirements as" --- 8.2.1 Provisions at the beginning; --- Modify the provisions of 8.3; --- Modify the introductory phrase 9.1 pairs of column item; --- 10.1 increase at the beginning of the word "use strains in the mesh method for determination of ultimate strain on the specimen"; --- Increased 10.6; --- The original standards were revised to 10.6 and 10.7 10.7 and 10.8, and amended their provisions; --- Increased by 11.3, then the terms of numbers in ascending order along the row; --- Revised 11.5 and 11.6, respectively (11.4 and 11.5 the original standards) provisions; Experimental determination based on the increase in the effective --- 11.6 Text "is. adjacent or close to three critical grid round the major axis or the minor axis of the foot Inch difference may not be greater than 10% are average "; --- Figure 5 (the original standard 4) in exchange of a) and b) of the position shown; --- Modify the provisions of 12.3; --- Increased by 12.4 and 12.5; --- Modify the provisions of 13.2 and remove the note; --- Increased 13.3; --- Delete the original standard in Appendix A, add new "in Appendix A of the grid should change Analysis Description"; --- Increased references; --- In addition to the above changes, but also on some of the original standard text format, and the figure caption item number column made editorial changes. Appendix A of this section is an informative annex. This part is proposed by China Machinery Industry Federation. This part of the National Standardization Technical Committee centralized forging. This section is drafted. Zhengzhou University, Baoshan Iron & Steel Co., Wuhan University of Technology, Dongfeng Motor Co. stamping die, Beijing University of Aeronautics and Astronautics, Huazhong University of Science and Technology. The main drafters of this section. Cao deep, Chen Xinping, Jiang Kuihua, Waring, Li Jianhua, Huang Shangyu, Mao Huajie, Li Xing, Li Zhigang. This part of the standard replaces the previous editions are. --- GB/T 15825.8-1995. Performance and test methods for metal sheet forming Part 8. Forming Limit Diagram (FLD) Determination Guide

1 Scope

GB/T 15825 in the provisions of this part of the laboratory testing sheet metal forming limit diagram (forminglimitdiagrams, Acronym FLD) of Setting Method. This section applies to the thickness of the sheet metal of 0.20mm ~ 3.00mm.

2 Normative references

The following documents contain provisions which, through reference GB/T 15825 in this section constitute provisions of this section. For dated reference documents Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section. GB/T 15825.2-2008 sheet metal formability and test methods - Part 2. General test procedures ISO 12004.1997 Determination of metal material FLD Guide ISO /T R14936.1998 metallic material strain analysis report 3 symbols, names and units The symbols used in this section, name and unit are shown in Table 1. Table 1 symbol, name and unit Symbol Name Unit FLD Forming Limit Diagram FLC FLC Dd die diameter mm Fc BHF N Fp punch force N ε1, ε2's principal strain Like strain hardening index ......

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