A Quantitative Evaluation Method for Fiber Length Distribution of Short Fiber Reinforced Composite Materials
A composite material fiber and short fiber reinforced technology, which is applied in the field of quantitative evaluation of fiber length distribution of short fiber reinforced composite materials based on skeleton segmented combination, can solve the problems of inapplicability, achieve strong applicability, promote research, and reduce work intensity Effect
Active Publication Date: 2019-08-20
SOUTH CHINA UNIV OF TECH
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Therefore, CT 3D reconstruction technology is not suitable for composite materials with close atomic density of matrix and fiber, such as carbon fiber reinforced polymer matrix composites.
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[0043] This embodiment takes the chopped carbon fiber reinforced polylactic acid composite material as an example, and specifically introduces a method for quantitatively evaluating the fiber length distribution of the short fiber reinforced composite material based on the frame segment combination. The implementation process is as follows:
[0044] First, cut any part of the composite material sample to be tested, place it in a crucible, put the crucible into a muffle furnace, and burn it at 500°C for 4 hours to burn out the polylactic acid matrix, leaving only carbon fiber.
[0045] After that, the separated carbon fiber is cooled, and a part of it is randomly poured on a glass slide. Then drop a small amount of absolute ethanol on the glass slide, tilt it back and forth to make the carbon fibers on the glass slide roughly dispersed, and then put the glass slide in the airless place. After the ethanol evaporates naturally, place the glass slide under the 3DFAMILY VMC250S image me...
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The invention discloses a method for quantitatively evaluating fiber length distribution of a short fiber reinforced composite. The method is implemented on the basis of framework segmented combination and comprises the steps as follows: fiber in a short fiber reinforced composite sample is separated and dispersed on a glass slide, a microscopic image of the fiber dispersed on the glass slide is acquired and transmitted into a computer, image segmentation and refining treatment is performed on the microscopic image, an obtained framework representing the fiber shape is broken into framework segments according to intersections, the framework segments are grouped again, all framework segments in each group correspond to the same fiber, the segments are subjected to linear fitting, a segmentrepresenting the fiber length is obtained, and the pixel length of the fiber is converted into real measured values finally according to a microscopic image ruler and counted. The method is a more accurate optical image measurement method and can improve the measurement efficiency and reduce the work intensity.
Description
Technical field [0001] The invention relates to the technical field of short fiber reinforced composite material evaluation, in particular to a method for quantitatively evaluating the fiber length distribution of a short fiber reinforced composite material based on a frame segment combination. Background technique [0002] Short fiber reinforced composite materials are the most versatile type of composite materials, which have many advantages such as large specific strength and specific modulus, simple molding process, and secondary processing. Due to the complex interaction between fiber and fiber, fiber and matrix, fiber and molding device during the molding process of composite materials, some fibers are broken by large external force. Therefore, fiber in fiber-reinforced composite materials or products The length is different, there is a length distribution, in which only the fiber exceeding the critical length can fully exert the reinforcing effect. [0003] When materials r...
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IPC IPC(8): G01N33/36
Inventor 吴宏武张蒙梁行
Owner SOUTH CHINA UNIV OF TECH