Inorganic nonmetal fiber strength distribution measuring and calculating method
An inorganic non-metallic and fiber strength technology, which is applied in the direction of strength characteristics, the use of stable tension/pressure test material strength, measuring devices, etc., can solve the large error of the fracture mirror method, and it is difficult to accurately measure the radius and mirror area of the mirror area The boundary is not obvious, etc., to achieve the effect of high precision, high test efficiency and easy realization
Active Publication Date: 2020-07-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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But in fact, the boundary of the mirror area on the fiber section is not obvious, and it is difficult to accurately measure the radius r of the mirror area m , and secondly, not all fiber end faces have mirror regions. In addition, the empirical parameter A in the formula m It is also difficult to determine accurately, so the error of the fractured mirror method is relatively large
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[0034] In order to further clarify the technical solution of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0035] Taking carbon fiber as an example, a method for measuring and calculating the strength distribution of inorganic non-metallic fibers, the implementation process is as follows:
[0036] Step 1: Carry out a tensile test on the carbon fiber bundle to obtain its stress-strain curve, such as figure 1 shown.
[0037] Step 2: According to the stress-strain curve of the carbon fiber bundle, calculate the carbon fiber elastic modulus E=214GPa.
[0038] The elastic modulus E of the fiber is the slope of the initial linear segment (straight segment) of the stress-strain curve of the fiber bundle.
[0039] Step 3: According to the stress-strain curve of the carbon fiber bundle, construct the single filament stress-fracture curve during the stretching process of the carb...
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Abstract
The invention discloses an inorganic nonmetal fiber strength distribution measuring and calculating method. The fiber strength distribution can be quickly and efficiently obtained on the basis of obtaining the stress-strain curve only by carrying out a tensile test on the single fiber bundle without carrying out a tensile test on a large number of fiber monofilaments, so that the method is easierto implement and high in test efficiency compared with an existing monofilament tensile test method. Besides, empirical parameters are not needed in the calculation process of the method, so that compared with an existing broken mirror surface method, the method is higher in precision, and an accurate reference basis is provided for development and application of materials.
Description
technical field [0001] The invention relates to a method for measuring fiber mechanical properties, in particular to a method for measuring and calculating the strength distribution of inorganic non-metallic fibers. Background technique [0002] Inorganic non-metallic fibers (including various types of carbon fibers and ceramic fibers, etc.) have excellent high-temperature mechanical properties and are key materials for manufacturing ceramic matrix composites. Due to the existence of randomly distributed defects inside, the strength of each single filament in a bundle of fibers is not the same, that is, it has a certain dispersion. As a reinforcing phase, the strength distribution of fibers plays a decisive role in the strength and stress-strain response of ceramic matrix composites. Therefore, how to obtain the strength distribution of inorganic non-metallic fibers is a key issue in the structural design of ceramic matrix composites. [0003] For the measurement of fiber ...
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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0067G01N2203/0075G01N2203/0218G01N2203/028
Inventor 宋迎东张盛高希光
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS