Testing method and device for flexural toughness of fiber reinforced concrete components

A fiber reinforced concrete, bending toughness technology, applied in the direction of using a stable bending force to test the strength of materials, etc., can solve the problem that the measuring device and method have not been developed, and achieve the effect of removing the influence of inertial force, high precision and high loading speed. Effect

Inactive Publication Date: 2015-11-11
POWERCHINA XIBEI ENG +1
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Problems solved by technology

Over the years, the SHPB test device has developed rapidly and has been continuously improved. Due to its simple structure, convenient operation, and ability to accurately control impact conditions, the device and method for measuring material toughness, especially bending toughness, based on SHPB technology has not yet been developed.

Method used

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  • Testing method and device for flexural toughness of fiber reinforced concrete components
  • Testing method and device for flexural toughness of fiber reinforced concrete components
  • Testing method and device for flexural toughness of fiber reinforced concrete components

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Embodiment Construction

[0045]The flexural toughness test method of the fiber concrete component of the present invention is based on the flexural toughness test device of the concrete component composed of a separated Hopkinson compression bar device to perform the flexural toughness test on the concrete specimen (90), and the flexural toughness test device includes an air gun ( 10), bullet (20), incident rod (30), transmission rod (40), strain gauge (50), accelerometer (60), bridge box (70), data acquisition system (80) connected with computer;

[0046] During the test, keep the loading end surface of the Hopkinson compression bar smooth and flat, and perpendicular to the length direction of the bar;

[0047] The bullet (20) in the air gun (10) is accelerated to hit the end of the incident rod (30) without notches and cracks, thereby generating an incident compression pulse in the incident rod (30) and propagating toward the concrete specimen (90) ;

[0048] When the incident pulse hits the comple...

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Abstract

The invention discloses a testing method and device for flexural toughness of fiber reinforced concrete components. The testing device for flexural toughness of fiber reinforced concrete components is formed based on a split Hopkinson pressure bar device for testing the flexural toughness of concrete samples. Firstly, a sample is dynamically loaded; a graph of an accelerometer is recorded. The testing method is characterized by also comprising the following steps: (1) replacing an inertial force distributed on the sample with a generalized inertia load acting in the middle of the sample; (2) according to a dynamic equilibrium equation, evaluating a real flexural load; (3) based on the one-dimensional stress wave theory, calculating a dynamic load of the concrete sample; and (4) according to the magnitude of energy absorbed by a fiber reinforced concrete component, determining the flexural toughness of the fiber reinforced concrete component. The testing method and the testing device disclosed by the invention are easy to operate and high in loading speed, and can effectively test the toughness of the fiber reinforced concrete component at high strain rate.

Description

technical field [0001] The invention belongs to the technical field of impact dynamics material characteristic testing, and relates to a bending toughness testing method and a device of fiber concrete components. Background technique [0002] Concrete is a brittle material, which is easy to break suddenly without significant deformation under the action of external force. Therefore, in order to ensure the safety of concrete materials, the toughness of concrete is usually improved by adding various metals, organic or inorganic materials to concrete materials, such as reinforced concrete, fiber concrete, reactive powder concrete, etc. Among them, fiber reinforced concrete has become a research hotspot because of its outstanding advantages. [0003] Fiber materials can increase the toughness of concrete. The more the fiber content is, the more obvious the toughness of concrete is, and the corresponding safety and durability are also improved. This is the general conclusion obt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20
Inventor 陈徐东陈晨邵羽徐令宇盛汝清邓蘅鑫
Owner POWERCHINA XIBEI ENG
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