GB/T 38686-2020 in English

VALID

Test method for flexibility of ultrathin glass—Two point bending method

Issued on:2020-03-31
Implemented on:2021-02-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $100.00
$97.00

Standard No:	GB/T 38686-2020
Document status:	VALID
Title in English:	Test method for flexibility of ultrathin glass—Two point bending method
Title in Chinese:	超薄玻璃柔韧性试验方法两点弯曲法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-03-31
Implemented on:	2021-02-01
ICS Classification:	81.040.01-Glass in general
Chinese Classification:	Q34-Industrial technical glass
Professional Classification:	GB-National Standard
Related Keywords:	flexibility two-point bending method bending deformation two-point bending method three-point bending method ultra-thin glass flat glass test method
Related Topics:	ultra thin Consistency of two curves external standard two-point method Toughness test method a bending test bending method glass viscosity bending method Three point bending test method How to test the curvature of glass Three-point bending test method for steel pipes point bending method pH two-point calibration method Glass bending inspection ph meter one point method two point method two point difference test two-point photometry Two-point bending equipment two-point endpoint Two-point method to measure bending Standard Curve Two Points flexibility Resilience Verification Two-point method abnormal curve Two points of environmental protection law How does the glass bend how to bend glass Algorithmic two-point method Super Flexible Tube glass bending equipment two-point calibration Three-point bending of glass Three point bending test method ultra-thin glass Three-point bending test conditions glass two-point test Two point test definition Method to Test Resilience Two-point method and standard curve method zero toughness test Three-point bending test method for metals Method for measuring curvature of glass Glass three-point bending experiment One point method, two point method and end point method two-point rate method Two-point endpoint method and two-point method Bending performance test method three-point bending method Bending glass machine One-point endpoint method and two-point endpoint method Glass 3 point bending two-point external standard method Two-point standard curve Film flexibility measurement method two-point standard curve method Three point bending definition two point lsa show two points Two-Point Method and Emphasis two point injection Rheometer two-point method Three-point curved glass Three-point bending of glass Four-point bending of glass speedometer two-point method Characterize glass Battery flexible bending GBT38686 GB/T 38686-2020 Four point bending test of glass gender experience Characterization of ultra-thin, ultra-flexible and ultra-light devices Glass warpage test method Piezoelectric film flexibility test Bending test method for conductive films on flexible substrates Three-point bending test method bending elastic modulus Two-point dissolution test method Flexural toughness of mortar Glass resistant to bending Two-point bending test of composite materials Biochemical reaction method Two-point method Endpoint method Ultra-thin glass specifications Three point bend test method Photovoltaic glass four-point bending Coating bending flexibility Differences/similarities between slide method and test tube method

《GB/T 38686-2020超薄玻璃柔韧性试验方法两点弯曲法》由TC447（全国工业玻璃和特种玻璃标准化技术委员会）归口，主管部门为中国建筑材料联合会。

Introduction

Analysis of the core content of the standard

This standard specifies a complete technical system for measuring the flexibility of ultra-thin glass using the two-point bending method, with the critical curvature radius as the core evaluation indicator.

Definition of key terms

Terms	Definition	Significance of the test
Ultra-thin glass	Flat glass with a thickness of ≤1.1mm	Definition of the scope of application of the standard
Critical radius of curvature	Minimum bending radius when the glass breaks	Quantitative index of flexibility
Two-point bending method	Bending deformation is generated by applying forces at both ends	Difference from three-point bending method

Technical requirements for test equipment

The test system needs to include:

Transmission system: ball screw accuracy ≤0.01mm
Image acquisition: 5-megapixel digital camera (10fps)
Protective device: tempered glass protective cover

Actual application case: A company uses a servo motor drive system with an industrial CCD camera to achieve a radius measurement accuracy of ±0.5mm.

Specimen preparation specification

Thickness range (mm)	Recommended length (mm)	Edge processing requirements
≤0.1	50±15	Edge polishing Ra≤0.8μm
0.1-0.2	200±20

Technology evolution analysis

Compared with the three-point bending method of GB/T34171, this standard:

Closer to actual bending conditions
Reduce stress concentration effect
Applicable to thinner glass (0.05-1.1mm)

Implementation suggestions

Key control points:

Specimens should be colored using a low-stress marker
Ambient temperature fluctuations should be controlled within ±2℃
Image processing software needs to be calibrated daily

The practice of a certain laboratory shows that the use of a constant temperature and humidity environment can reduce the RSD of the test results to less than 3%.

More samples: JJG 21-2008 QC/T 942-2021 DL/T 368-2010

Sample only — not a preview of GB/T 38686-2020

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