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Device and method for measuring yarn bending rigidity

A bending stiffness and measuring device technology, applied in the direction of using a stable bending force to test the strength of materials, etc., can solve the problems of difficult test operation, difficult implementation, large errors, etc., to avoid yarn twisting, reduce measurement errors, and characterization methods simple effect

Active Publication Date: 2015-05-27
HARBIN INST OF TECH
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Problems solved by technology

[0003] The existing test methods for measuring the bending stiffness of yarn mainly include the cantilever beam method of equal cross-section and the Karleen method, but due to the gap between the model and the actual bending, the test operation is difficult, or the error is large, so it is difficult to implement

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  • Device and method for measuring yarn bending rigidity
  • Device and method for measuring yarn bending rigidity
  • Device and method for measuring yarn bending rigidity

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Embodiment Construction

[0036] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the present invention. within the scope of protection.

[0037] The invention provides a yarn three-point bending experimental device, such as figure 1 As shown, the experimental device consists of a mass 1, a yarn clamp 2, a fixed pulley 5, a yarn 6, an indenter 7, a support 8, a base 9, a uniaxial tensile testing machine 10, a computer controller 11 and a CCD camera 12 constitute. in:

[0038] A base 9 is fixed on the base of the uniaxial tensile testing machine 10;

[0039] A bracket 8 is respectively fixed at the left and right ends of the base 9;

[0040] The upper end of the bracket 8 is equipped wi...

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Abstract

The invention discloses a device and a method for measuring yarn bending rigidity. The measuring device consists of a mass block, yarn clamps, fixed pulleys, yarns, a pressure head, brackets, a base, a uniaxial tensile testing machine, a computer controller and a CCD camera, wherein the base is fixedly arranged on a pedestal of the uniaxial tensile testing machine; the brackets are respectively fixed at the left and right ends of the base; the fixed pulleys are arranged at the upper ends of the brackets; the yarn clamps are fixedly arranged on the brackets; the yarns penetrate through the yarn clamps and the fixed pulleys; the mass block is connected with one end of the yarns; the pressure head is connected with a top beam of the uniaxial tensile testing machine; and the computer controller is connected with the uniaxial tensile testing machine and the CCD camera. The yarn bending performance characterization method provided by the invention is simple, and isotropic hypothesis is broken through; and moreover, the nonlinear characteristics of the yarn bending performance can be well characterized.

Description

technical field [0001] The invention relates to a device and method for measuring yarn bending stiffness. Background technique [0002] In the molding process of fabric-reinforced resin-based composites, the pre-forming accuracy of the fabric reinforcement has a significant impact on the mechanical properties of the final composite, and the bending stiffness of the yarn in the fabric reinforcement is one of the main factors affecting the molding ability of the fabric reinforcement. Therefore, mastering the bending stiffness of the yarn has important engineering significance for the preform design and forming accuracy of the fabric reinforcement. [0003] The existing test methods for measuring the bending stiffness of yarn mainly include the cantilever beam method with equal cross-section and the Karleen method. However, due to the gap between the model and the actual bending, the test operation is difficult, or the error is large, so it is difficult to implement. Contents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20
Inventor 林国昌袁学波谭惠丰
Owner HARBIN INST OF TECH
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