GB/T 41777-2022Forensic sciences—Examination methods for explosive strength (English PDF)
法庭科学 爆炸物爆炸威力检验方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 14, 2022
Implementation date
February 1, 2023
Scope
GB/T 41777-2022 is the English-translated version of 法庭科学 爆炸物爆炸威力检验方法.
GB/T 41777-2022 describes how the explosive power of an explosive is examined in forensic science work.
The mass of explosive is converted into a TNT equivalent through the equivalence coefficient of its type, the overpressure of the shock wave of a free-field air explosion is calculated from that equivalent, and the range over which people would be harmed is then assessed.
The document applies to explosives with an equivalent of not less than 30 g of TNT and may also be used for reference in other fields. It covers the examination of the explosive medium and high explosives, the equivalent and overpressure calculations, the damage range assessment and the examination conclusion, with an informative annex of tables.
Clause 2 cites GB/T 41775. It was issued on 14 October 2022 and has applied since 1 February 2023.
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Document preview — GB/T 41777-2022
National Standard of the People's Republic of China
- ICS
- 07.140
- Classification
- A 92
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Principle
- 5 Test
- 5.1 Examination of explosive medium and high explosives
- 5.2 Calculation of TNT Equivalent of Explosives
- 5.3 Calculation of overpressure of air free field explosion shock wave
- 5.4 Damage Scope Assessment
- 6 Inspection conclusion
- Appendix A (Informative) Table
- Reference
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 of Standardization Documents" drafted.
1 Scope
This document describes a method for testing the explosive power of explosives in the field of forensic science.
This document is applicable to the test of the explosive power of explosives with an equivalent of not less than 30gTNT in the field of forensic science, and can also be referred to in other fields.
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.
GB/T 41775 Forensic Science Explosives Identification Terms
3 Terms and Definitions
Terms and definitions defined in GB/T 41775 apply to this document.
4 Principles
The mass of the explosive in the explosive is converted to TNT equivalent, and the explosion impact in the air free field is calculated according to the converted TNT equivalent The range of damage caused by the wave to the personnel is to evaluate the explosive power of the explosive.
5 Inspection
5.1 Inspection of Explosive Medium and Fire Explosives
Identify the types of explosives in explosives with reference to GB/T 41845.
5.2 Calculation of TNT Equivalent of Explosives
According to the TNT equivalence coefficient of the explosive and the mass of the explosive sample, the TNT equivalent of the explosive can be calculated according to formula (1).
The TNT equivalence coefficients of the types of explosives are shown in Table 1). WTNT=lambdaWEXP (1) where.
WTNT---the TNT equivalent of the explosive medium and explosive, the unit is kilogram (kg); lambda --- TNT equivalence coefficient of explosives; WEXP---the mass of explosive medium-fire explosives, in kilograms (kg).
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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