Fracture end protective agent used for brittle fiber mechanics measurement, its proparation and use

Abstract

A method for preparing protectant of brittle fiber breaking end in mechanical test includes using white oil, water, wetting agent and emulsifier as main composition then carrying out water phase preparation, oil phase preparation and two phase mixed emulsification on water ¿C in- oil latex for obtaining protectant of breaking end.

Description

Technical field: [0001] The invention is a technology for intact retention of fiber fracture ends when measuring brittle fiber mechanics, and furthermore relates to a fracture end protecting agent, preparation and application for brittle fiber mechanics measurements. Background technique: [0002] The mechanical measurement of flexible fibers, including stretching, bending, shearing, and torsion, its damage is not easy to happen first, because the deformation loses energy; second, even if it is broken, its broken end can be preserved intact, which is convenient for people to understand or recognize its Fracture mechanism. Therefore, there is no problem of retention of broken ends at all. However, brittle fibers, such as carbon fibers, glass fibers, ceramic fibers, and mineral fibers, will not only fracture under small deformations when stretched, bent, sheared, and twisted, but also cause secondary fractures due to shock vibrations. , especially in conventional tensile exp...

AI Technical Summary

Problems solved by technology

Existing carbon fiber tensile research (Yao Jiangwei, Yu Weidong. Influencing factors of carbon fiber monofilament tensile test, Journal of Materials Science and Engineering, 2005, 23(5): 1-4) has proved that brittle fiber tensile fracture Due to the instantaneous release of elastic potential energy, the two broken ends of the fibers will rebound at a high speed from the fracture to the direction of the clamping point, which will eventually cause the broken ends of the fibers to be damaged during the high-speed recovery and cannot be completely retained, resulting in brittle fibers. Situations where tensile section analysis cannot be performed

The protection method that this produces also has report (S.C.Bennett.D.J.Johnson.Strength-structure relationships in PAN-based carbonfibers.Journal of materials science, 1983,18:3337-3347; B.J.Jnice, B.B.John, S.Roberte.Analysis of flaws in high-strength carbon fibers from mesophase pitch.Journal of materials science, 1980, 15: 2455-2465), but whether there is indeed a retention effect and the quantitative value of the retention rate produced by the protective agent lacks data support, and there is no patent report