GB/T 35777-2017 in English

VALID

Mechanical tests for metal alloys adornment chains―Tensile testing

Issued on:2017-12-29
Implemented on:2018-04-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $160.00
$156.00

Standard No:	GB/T 35777-2017
Document status:	VALID
Title in English:	Mechanical tests for metal alloys adornment chains―Tensile testing
Title in Chinese:	金属及其合金饰品链力学性能测试拉力测试
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2017-12-29
Implemented on:	2018-04-01
ICS Classification:	39.060-Jewellery
Chinese Classification:	Y88-Artistic handicrafts
Professional Classification:	GB-National Standard
Related Keywords:	alloy jewelry chain mechanical performance test tensile test tensile test method tensile testing machine alloys adornment chains alloy jewelry chains
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《GB/T 35777-2017金属及其合金饰品链力学性能测试拉力测试》由TC374（全国质量监管重点产品检验方法标准化技术委员会）归口，主管部门为国家标准化管理委员会。

Introduction

GB/T 35777—2017 Standard In-depth Interpretation

GB/T 35777—2017 "Metal and Alloy Jewelry Chain Mechanical Performance Test Tensile Test" standard regulates the tensile test method for metal and alloy jewelry chains, aiming to ensure product quality and safety. This standard was proposed by the National Quality Supervision Key Product Inspection Method Standardization Technical Committee and released in 2017.

Comparison of standard frameworks

Chapter	Content Overview	Key Requirements
1 Scope	Scope of application and test objectives	Covering the maximum force and specified elongation force determination of finished and semi-finished jewelry chains
5 Instruments and Equipment	Requirements for tensile testing machines and auxiliary tools	The testing machine must have a precision of Class 1 or higher and be equipped with pin-type and push-type clamping aids
6 Test Steps	Complete process from sample preparation to result processing	Environmental Control, Sample Fixation, Tensile Speed and Fracture Criteria

Terminology Analysis and Practical Application Examples

1. Maximum Force (F_m)

The maximum force a specimen can withstand during a tensile test. For example, when testing a finished chain, the specimen breaks after reaching F_m, and the value recorded at this time is the maximum force.

2. Force for Specified Elongation (F_p)

The force when the elongation of the gauge length of the specimen reaches the specified value. For example, F_p0.5 represents the force at an elongation of 0.5%.

Standardization Background and Technology Evolution Analysis

This standard was drafted based on GB/T1.1-2009 "Guidelines for Standardization Work Part 1: Structure and Writing Rules of Standards", combining the actual needs of the precious metal industry and jewelry manufacturing field. Its technical content refers to international advanced testing methods and is optimized for the characteristics of jewelry chains.

Implementation Suggestions

Choose appropriate test equipment: Ensure that the tensile testing machine has a precision of Class 1 or higher and is equipped with auxiliary tools that meet the requirements (such as pin-type connection auxiliary tools and buffer clamping devices).
Control the test environment: Keep it within the range of 10°C to 35°C to avoid the influence of corrosive gases.
Standardized sample preparation: Select the sample length and clamping method in accordance with the standard requirements to ensure that the original gauge length L₀ is not less than 80mm or 100mm.
Strictly enforce stretching speed limits: The stretching speed of finished chains and chains shall not exceed 300mm/min, and the stretching speed of semi-finished products such as fasteners and rings shall not exceed 10mm/min.

More samples: GB 18306-2015 NB/T 47013.2-2015 DL/T 368-2010

Sample only — not a preview of GB/T 35777-2017

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