Test piece of concrete direct tensile test, test piece forming die and integrated equipment

A tensile test and complete set of device technology, which is applied in the measurement device, the preparation of the test sample, and the application of stable tension/pressure to test the strength of the material, etc. The inherent characteristics of concrete and the inability to obtain test results can achieve the effect of easy manual loading, high test efficiency, and saving manpower and material resources.

Active Publication Date: 2016-10-12
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the fixture provided by this invention can clamp and tensile test the eight-shaped concrete specimen, the practice shows that the success rate of the test is very low, that is, the fracture of the specimen is almost all at the variable section, and it is difficult to occur at the predetermined failure. Within the range, the obtained test results cannot reflect the essential characteristics of concrete random fracture
Since a reasonable solution cannot be given in terms of the type of specimen

Method used

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  • Test piece of concrete direct tensile test, test piece forming die and integrated equipment
  • Test piece of concrete direct tensile test, test piece forming die and integrated equipment
  • Test piece of concrete direct tensile test, test piece forming die and integrated equipment

Examples

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Example Embodiment

[0056] Example 1:

[0057] The following combination Figure 1 to Figure 11 The specific embodiments of the present invention will be described in detail. The concrete direct tensile test specimens, specimen forming molds and complete sets of equipment of the present invention include concrete direct tensile test specimens, concrete direct tensile test specimen forming molds and concrete direct tensile test specimens. Complete set of tensile test equipment.

[0058] The concrete direct tensile test specimen is a dumbbell-shaped tensile specimen with a square section and equal thickness. For a heterogeneous and discontinuous multiphase composite material such as concrete, the failure process is controlled by randomly distributed internal defects and cracks. The fracture failure point of the specimen under the action of axial stress is uncertain. In order to obtain more valuable information about the failure behavior of the concrete, the failure of the specimen must occur in the pred...

Example Embodiment

[0079] Example 2:

[0080] See Figure 1 to Figure 8 with Figure 12 to 14 . Example 2 is the same as Example 1 in terms of the concrete direct tensile test specimen and its forming mold, and the complete set of concrete direct tensile test equipment compatible with the structure of the specimen. The technology of Example 2 is different from that of Example 1. The characteristic is that the deformation sensor adopts the resistance strain gauge type extensometer 18B, the clamp D5 on the upper frame gauge length column D3 and the corresponding clamp D5 of the lower frame are used to fix the limit rod D15, and the limit rod D15 end One side of the extensometer is provided with a knife blade slot D16 for limiting the position of the blade of the extensometer, and the other side is provided with a non-slip groove D17 to prevent the clamp from falling off. The clamp may be a rubber band or a spring. During the test, the resistance strain gauge The blade of the extensometer 18B is alw...

Example Embodiment

[0081] Example 3:

[0082] See Figure 1 to Figure 8 . Under the condition of a universal testing machine, one set of test piece tension clamping fixture 17 can be directly connected to the upper jaw of the testing machine through the ball joint connector 16, and the other set of test piece tension clamping fixture 17 passes first The ball hinge connector 16 is connected to the load sensor 20, and the load sensor 20 is connected to the lower jaw of the testing machine through the ball hinge connector 16, and the position of the cross beam of the universal testing machine is adjusted to clamp the test piece 7 between the upper and lower test pieces. Pull the clamping fixture 17 and make the load value zero. After the data acquisition system is connected, the loading test can be completed through the automatic loading program of the universal testing machine, and the data recording and post-processing can be completed through the acquisition system, which is integrated in the test...

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Abstract

The invention discloses a test piece of a concrete direct tensile test, a test piece forming die and integrated equipment. According to the invention, the test piece of the concrete direct tensile test, the test piece forming die of the concrete direct tensile test and the integrated equipment of the concrete direct tensile test are provided; the test piece of the concrete direct tensile test is a square-cross section equal thickness dumbbell-type tension test piece; the test piece forming die of the concrete direct tensile test comprises a side mold framework and a base plate, the side mold framework is formed by performing butt joint on two linked side plates; and the integrated equipment of the concrete direct tensile test comprises a loading framework, a loading mechanism, a test piece tensioning clamper, a test piece deformation test clamp and a data acquisition system. The Test piece of concrete direct tensile test, the test piece forming die and the integrated equipment have the advantages of reasonable design, simple structure, environmental protection, high efficiency and accurate testing.

Description

technical field [0001] The invention relates to the technical field of engineering testing and testing, in particular to a concrete direct tensile test specimen, a specimen forming mold and a complete set of equipment. Background technique [0002] Concrete direct tensile test is an important technical means to accurately obtain a series of tensile parameters such as concrete tensile strength, ultimate tensile value and tensile modulus of elasticity, which provides an important basis for concrete structure design, theoretical analysis and performance evaluation. However, there is no ideal test method and device for direct tensile test of concrete at present, and the uniaxial tensile strength of concrete is mostly obtained through indirect tensile test or through empirical formula conversion with compressive strength. Indirect tensile test methods for concrete, such as splitting tensile strength and flexural tensile strength, are relatively simple, but they are not strictly s...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N3/02G01N3/04G01N3/08
CPCG01N1/28G01N3/02G01N3/04G01N3/08
Inventor 汤寄予高丹盈赵军朱海堂王宝庭赵卓齐新华尤培波
Owner ZHENGZHOU UNIV
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