Tensile property test of carbon fiber dipped yarn

Tensile properties are the most important mechanical properties of carbon fiber. The tensile properties of carbon fiber yarns at home and abroad are mainly measured using dipped yarns. The carbon fiber dipped yarn tensile property test can determine the tensile strength, tensile elastic modulus and tensile strain of carbon fiber.
Zhongke Testing and Reliability Experiment Center has the capabilities of environmental testing and reliability performance testing of various carbon fibers, and provides professional dipped yarn tensile performance testing services for carbon fibers.

1. Classification according to the performance of carbon fiber:
High-performance carbon fiber (including high-strength carbon fiber, high-modulus carbon fiber, medium-modulus carbon fiber, etc.);
Low-performance carbon fiber (including refractory fiber, carbon fiber, graphite fiber, etc.).
2. Classification based on raw fiber type: polyacrylonitrile-based fiber, viscose-based carbon fiber, pitch-based carbon fiber, lignin fiber-based carbon fiber, other organic fiber-based;
3. Classification according to the function of carbon fiber: carbon fiber for stressed structures, flame-resistant carbon fiber, activated carbon fiber (adsorption activity), conductive carbon fiber, lubricating carbon fiber, and wear-resistant carbon fiber.

After the yarn is evenly impregnated and solidified, it is stretched until it breaks under the constant speed loading of an appropriate mechanical device. According to the tensile stress-strain curve, the tensile strength, tensile elastic modulus and tensile strain at maximum load are calculated. The tensile modulus of elasticity is the ratio of the change in stress to the corresponding change in strain.
The stress-strain relationship of carbon fiber yarn is nonlinear, so the secant modulus should be defined. Usually defined by two strain points. Linear density and sizing agent content should be measured separately.

GB/T 26749-2022 Determination of tensile properties of carbon fiber dipped yarn
GB/T1040.1 Plastics - Determination of tensile properties - Part 1: General
GB/T 7690.1 Reinforced Materials Yarn Test Methods Part 1: Determination of Linear Density
GB/T 29761 Carbon fiber sizing agent content determination
GB/T 30019 Carbon fiber density determination
GB/T 40724 Carbon fiber and its composite materials terminology
ASTM D4018-17 Standard Test Method for Properties of Carbon and Graphite Continuous Fiber Tows
GB/T 3362-2017 Carbon fiber multifilament tensile properties test method