GB/T 33621-2017 in English

VALID

Test method for bending properties of 3D braided fabric and its polymer matrix composites

Issued on:2017-05-12
Implemented on:2017-12-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $160.00
$156.00

Standard No:	GB/T 33621-2017
Document status:	VALID
Title in English:	Test method for bending properties of 3D braided fabric and its polymer matrix composites
Title in Chinese:	三维编织物及其树脂基复合材料弯曲性能试验方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2017-05-12
Implemented on:	2017-12-01
ICS Classification:	59.100.99-Other materials for the reinforcement of composites
Chinese Classification:	W04-Basic standards and general methods
Professional Classification:	GB-National Standard
Related Keywords:	composite bending performance test three-dimensional braided structures test method test method three-point bending test same bending performance
Related Topics:	3D standard Resin Bending Properties Three point bending composite material resin compositecurved Composite three-point bending resin base Resin three-point bending method Composite plate bending test Three-point bending of resin matrix composites Flexural Properties of Resin Matrix Composites Bending performance test method Three-point bending test raw materials Bending properties Three-point bending test of composite materials 3. Experimental materials and methods Composite panel three-point bending Nitrile resin based composites Composite three-point bending Composite three-point bend Resin based composite resin Downstream Composite Materials and Their Applications Synthetic 3D materials Four-point bending of resin matrix composites Other materials and properties Composite elastic modulus Composite Bend Carbon Fiber Composites Bending Test Three-point bending test of composite materials Resin Bending Test Plastic resin three-point bending test Composite three-point bending Three-point bending test method for materials GBT33621 GB/T 33621-2017 Resin content testing in composite materials Bending performance testing of polymer matrix composites Two-point bending test of composite materials Composite tubular bend testing Carbon composite bending performance testing Composite material flexural modulus test Resin-based composite products

《GB/T 33621-2017三维编织物及其树脂基复合材料弯曲性能试验方法》由TC209（全国纺织品标准化技术委员会）归口，TC209SC7（全国纺织品标准化技术委员会产业用纺织品分会）执行，主管部门为中国纺织工业联合会。

Introduction

GB/T 33621—2017 Standard Overview

National Standard of the People's Republic of China GB/T 33621—2017 "Test Method for Flexural Properties of Three-Dimensional Braided Fabrics and Their Resin-Based Composite Materials" is an important standard in the textile industry, which aims to standardize the test method for the flexural properties of three-dimensional braided fabrics and their composite materials. This standard is applicable to fabrics and their resin-based composite materials produced by three-dimensional braiding technology, but does not include products with special-shaped structures.

Background of Standard Formulation

With the widespread application of composite materials in aerospace, automobile manufacturing and other fields, the demand for testing high-performance materials is growing. GB/T 33621—2017 fills the gap in the test method for the flexural properties of three-dimensional braided fabrics and their composite materials, and provides a unified technical specification for the industry.

Technology Evolution Analysis

Compared with traditional two-dimensional braiding technology, three-dimensional braiding technology has significant advantages in the application of complex structural parts. The formulation of GB/T 33621-2017 standard reflects the progress of material manufacturing technology and the innovation of testing methods, especially in the design of unconstrained three-point bending test device, which provides a reliable basis for the accurate measurement of bending properties.

Comparison of standard frameworks

Dimensions	GB/T 33621—2017	Differences in international standards
Scope of application	Three-dimensional braided fabrics and their resin-based composites	Similar to ASTM D7080-13 (composite bending performance test) but more focused on three-dimensional braided structures
Test method	Unconstrained three-point bending test	Same as ISO 178:2016 (plastic bending test) in principle, but with different specific parameters
Performance indicators	Maximum bending stress, bending elastic modulus, load-deflection curve	Expanded the test requirements for dynamic bending performance of composite materials

Practical application case analysis

Case 1: Aerospace

An aircraft manufacturer used the GB/T 33621-2017 standard to test the bending performance of its three-dimensional woven carbon fiber composite materials. By accurately controlling the loading speed and span, reliable bending elastic modulus data was successfully obtained, providing an important reference for aircraft structure design.

Case 2: Automotive Industry Application

An automotive parts manufacturer used this standard to test its new three-dimensional woven glass fiber composite material. Through comparative analysis with traditional materials, the potential advantages of this material in lightweighting the vehicle body were verified.

Implementation Suggestions

Equipment Calibration: Ensure that the testing machine and fixture meet the standard requirements and perform metrological verification regularly.
Specimen Preparation: Cut the specimens strictly according to the recommended proportions and ensure that the working section contains at least two complete unit cells.
Environmental Control: Keep the temperature and humidity of the test environment stable to avoid external factors interfering with the test results.
Data Recording: Record the load-deflection curve in detail to facilitate subsequent analysis and comparison.