Method for testing breaking strength of glass fiber reinforced composite material workpiece

A technology of reinforced composite materials and glass fibers, applied in the direction of applying stable tension/pressure to test the strength of materials, analyzing materials, strength characteristics, etc., can solve problems such as structural design defects, affecting project progress, and insufficient strength, so as to reduce design The effects of processing costs, shortening the design and development cycle, and improving the qualified rate of parts

Active Publication Date: 2020-11-24
中广核俊尔(浙江)新材料有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the failure judgment standard of long glass fiber reinforced composite injection molded parts in practical applications is checked according to the material strength. The national standard material strength test does not consider the influence of glass fiber orientation. The flow of the material causes the fibers to be oriented, and the mechanical properties of the molded product are anisotropic
When performing strength checks, the safety factor is currently used for discount calculations, which will cause deviations and structural design defects, either excess strength or insufficient strength
Often in the structural design, the strength meets the requirements, but the influence of glass fiber orientation is not considered. In the test and test stage, failure problems may occur, which requires re-structural design, optimization, and verification, which affects the project progress, wastes time, and consumes more. Human and material resources and other resources

Method used

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  • Method for testing breaking strength of glass fiber reinforced composite material workpiece
  • Method for testing breaking strength of glass fiber reinforced composite material workpiece

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Experimental program
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Embodiment 3

[0051] In Example 3, it can be found that the error between the conventional tensile strength value and the actual breaking strength value that is not processed by the method of the present invention is 33.5%, and the error between the calibration value obtained by using the method of the present invention and the actual breaking strength value is only 0.46% .

Embodiment 5

[0052] In Example 5, it can be found that the error between the conventional tensile strength value and the actual breaking strength value that is not processed by the method of the present invention is 26.5%, and the error between the calibration value obtained by using the method of the present invention and the actual breaking strength value is only 0.48% .

[0053] It can be seen that the existing national standard method of testing the tensile strength by injection molding into a spline cannot well reflect the failure strength that the actual part can withstand. The damage strength that can be withstood will lead to wrong estimation, which will lead to the occurrence of problems such as product misuse and vulnerability.

[0054] The equipment used in the method of the invention is simple, easy to implement and operate, reduces design and processing costs, shortens the design and development cycle of the entire product, improves the qualification rate of parts, greatly imp...

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Abstract

The invention discloses a method for testing the breaking strength of a glass fiber reinforced composite material workpiece. The method comprises the following steps: respectively testing the tensilestrength of glass fiber reinforced composite material sample strips with different glass fiber orientations, and calculating to obtain the checking strength sigma g of the workpiece according to a formula, namely the breaking strength of the workpiece; in the formula, sigma theta 1-sigma theta m respectively represent the tensile strength of a sample strip of which the included angle between the glass fiber orientation and the tensile direction is theta 1-theta m, and n1-nm respectively represent the weight of sigma theta 1-sigma theta m.

Description

technical field [0001] The invention relates to the technical field of discontinuous glass fiber reinforced plastic molding, in particular to a method for testing the failure strength of glass fiber reinforced composite material parts. Background technique [0002] Discontinuous fiber reinforced composite materials have the advantages of light weight, high modulus, fatigue resistance, corrosion resistance and good electrical insulation properties, and can completely replace metal materials in some aspects, among which long glass fiber reinforced composite materials (such as publication number CN107964240A) , CN110511490A and other patent specifications disclosed composite materials) are widely used in machinery industry, construction industry, automobile industry and transportation industries. [0003] The failure judgment standard of long glass fiber reinforced composite injection molding parts in practical application is to check according to the material strength. The nat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0017G01N2203/0067
Inventor 张成陈晓敏周功浪周琨生郑云磊
Owner 中广核俊尔(浙江)新材料有限公司
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