GB/T 15825.8-2008Sheet metal formability and test methods - Part 8: Guidelines for the determination of forming-limit diagrams (English PDF)

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

1 Scope

GB/T 15825.8-2008 is the Chinese national standard on sheet metal formability and test methods - part 8: guidelines for the determination of forming-limit diagrams, in the field of metallurgy. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 23 December 2008 by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China, and has been in force since 1 June 2009. Classification: ICS 77.040.10, CCS J32. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

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 epsilon1, epsilon2's principal strain Like strain hardening index

4 Test principle