Method for testing elastic modulus and strength of fiber materials and device thereof

Abstract

The invention provides a method for testing elastic modulus and strength of fiber materials and a device thereof. The device comprises a load control system, a support frame, a clamp, an electronic balance and a microscope control system. The accurate electronic balance is used for measuring load, and the clamp is used for converting compression load into fiber tensile load. After initial load is exerted on fibers, a load control tank exerts load, the microscope is used for measuring relative displacement change after and before load is exerted, and the elastic modulus of the fibers can be calculated according to relation of stress increment-strain increment. Force is continuously exerted until the fibers are broken, and tensile strength of the fibers can be calculated according to critical load and cross sectional area of the fibers. The method and the device can be used for measuring elastic modulus and strength of fibers of a few micrometers to dozens of micrometers or yarns, thereby resolving testing problems in the field and having significance on mechanical property assessment of small fibers and experiment equipment development.

Description

technical field [0001] The invention belongs to the field of material performance testing, and in particular relates to a method and a device for testing the elastic modulus and strength of fiber materials. Background technique [0002] The elastic modulus and strength of fibers or filaments are their basic mechanical properties. In practical applications in aerospace, electronic information, biomedical materials and other fields, their elastic modulus and strength need to be considered to achieve the purpose of structural design. [0003] The modulus of elasticity reflects the ability of a material to resist deformation caused by external forces, and is one of the basic mechanical properties of a material. For conventional solid materials, the commonly used measurement methods include stress-strain method, bending method, acoustic resonance method and ultrasonic method. The stress-strain method usually requires installing a strain gauge on the fiber, then applying a certai...

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Problems solved by technology

[0005] Although there are many methods for testing the elastic modulus and strength of conventional solid materials, the test for the elastic modulus and strength of fibers or filaments is almost blank, and there is no national standard or industry standard to follow

Since the metal filament or fiber is very small, and bears a small load, and is easy to deform, the excitation instrument generated by the dynamic method test does not respond, which makes the test difficult. The load resolution of the conventional universal testing machine cannot reach the elongation. also difficult to test

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