Method for quantitatively evaluating orientation degree of short fiber reinforced composite fibers

A composite material fiber and short fiber reinforced technology, which is applied in the direction of material analysis, material analysis by optical means, material analysis by measuring secondary emissions, etc., can solve the problems of cumbersome processing and complex calculation models

Active Publication Date: 2012-11-07
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

The above method solves the problem that the same elliptical section corresponds to two fiber directions, but this method require

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  • Method for quantitatively evaluating orientation degree of short fiber reinforced composite fibers
  • Method for quantitatively evaluating orientation degree of short fiber reinforced composite fibers
  • Method for quantitatively evaluating orientation degree of short fiber reinforced composite fibers

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Embodiment Construction

[0033] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0034] Take the hot extrusion forming of chopped carbon fiber reinforced magnesium matrix composites as an example. Cylindrical chopped carbon fiber reinforced magnesium matrix composites Figure 4 location shown in (attached Figure 4 As shown in 4 in (a), above the magnesium-based composite material is a magnesium alloy, and the magnesium-based composite material and magnesium alloy are heated to 420°C for extrusion, so that the composite material fills the mold cavity (attached Figure 4 (b)). After cooling, take out the composite parts, as attached Figure 5 shown. Before forming chopped carbon fiber reinforced magnesium matrix composites, the internal fiber orientations are approximately randomly distributed, but after the composites are formed, the internal fiber orientation state will change.

[0035] The length-to-diameter ratio of short fibers insid...

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Abstract

The invention relates to a method for quantitatively evaluating orientation degree of short fiber reinforced composite fibers, which is characterized by selecting and determining a sectioning surface and sectioning a composite sample; acquiring a micrograph via an optical microscope or a scanning electron microscope; repainting the elliptic fiber section in the micrograph in graphic image software; extracting the lengths of long axis and short axis and an angle between the elliptic long axis and a coordinate axis in the repainted picture; calculating the direction vectors of the fibers corresponding to the ellipses according to the extracted parameters of the elliptic section; and calculating the parameters of the orientation degree of the composite along a specific direction. According to the method, the proper sectioning surface is selected so as to eliminate the calculation errors caused by condition that the same elliptic section corresponds to two fiber directions. In addition, a calculated mode given by the method considers the probability of sectioning the fibers, and the calculating result is more accurate in comparison with the calculated mode which does not consider the probability of sectioning the fibers.

Description

technical field [0001] The invention relates to an evaluation method for short fiber reinforced composite materials, in particular to a method for quantitatively evaluating the fiber orientation degree of short fiber reinforced composite materials. Background technique [0002] Short fiber reinforced composites are an important engineering material with many advantages, such as high specific strength, high specific stiffness, good designability, easy preparation, and secondary processing. In the molding process of short fiber reinforced composites such as forging, extrusion molding, injection, etc., the fiber orientation inside the material will change, and the performance of short fiber reinforced composites is closely related to the state of the internal fiber orientation, such as when short When the fibers inside the fiber-reinforced composite material are not randomly distributed in three-dimensional space, the material often exhibits strong anisotropy, while when the fi...

Claims

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Application Information

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IPC IPC(8): G01N21/00G01N23/22G01N1/04
Inventor 齐乐华徐乙人周计明郑武强马玉钦
Owner NORTHWESTERN POLYTECHNICAL UNIV
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