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On-site measuring apparatus for local mechanical properties of materials

An on-site measurement and mechanical technology, applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of heavy equipment, large geometric measurement errors, inconvenient installation, etc., and achieve the effect of reducing contact friction

Inactive Publication Date: 2011-09-28
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, there are still some problems in this experimental device: the large dispersion of test results, the heavy device is inconvenient to install, the installation is troublesome, and the centering of the indenter and the double-hole bridge wall is not well controlled.
Senturia attributed this situation to two main reasons: the models used to interpret the data were not accurate enough and the geometric dimensions of the specimens were measured with large errors

Method used

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  • On-site measuring apparatus for local mechanical properties of materials
  • On-site measuring apparatus for local mechanical properties of materials
  • On-site measuring apparatus for local mechanical properties of materials

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Embodiment Construction

[0012] like figure 1 , figure 2 , image 3 As shown, the device of the present invention is composed of a driving loading shear unit, a device fixing unit, a displacement detection unit, and a load detection unit. The driving loading shear unit, the device fixing unit, the displacement detection unit and the load detection unit are all installed on a U-shaped On the groove 11, the screw rod 6 in the driving loading and shearing unit is installed on the bracket 4 through the first bearings 7 at both ends, and the DC motor 10 is fixed on the bracket 4 through two M6 inner hexagon bolts 9, and is connected by a coupling 8 is connected with the screw mandrel 6, the slider 5 with rollers is installed on the screw mandrel 6, the swing rod 20 can swing in the U-shaped groove 11, and the second bearing 21 in the middle is in contact with the slope of the slider 5 with rollers, The indenter 2 is made of hard alloy with a thickness of 1±0.1mm. It is fastened to one end of the swing r...

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Abstract

The invention discloses an on-site measuring apparatus for local mechanical properties of materials. The apparatus comprises: an apparatus fixing unit, a load shear driving unit, and a load-displacement detection unit. The load shear driving unit comprises a DC motor, a screw rod, a slide block with rollers, and a sway bar with a pressure head. The apparatus fixing unit comprises positioning teeth, bolts and a U-shaped slot. The load-displacement detection unit comprises a displacement sensor and a load sensor. With the apparatus provided by the present invention, preparations of samples are not necessary. A material which requires measuring is provided with two holes with depths of 6 mm on two sides of a subregion which is to be detected. The positioning teeth are inserted into the two holes for holding the whole apparatus. The subregion is provided with increasing load by the pressure head from one of the holes until the material in the subregion is damaged. The load-displacement curves are recorded by the displacement sensor and the load sensor, and are converted into stress-strain curves. Therefore, the apparatus can be used for on-site assessments of local mechanical properties of materials.

Description

technical field [0001] The patent of the present invention relates to testing equipment for mechanical properties of materials. Background technique [0002] In engineering, it is necessary to obtain the local characteristics of welded joints with inhomogeneous mechanical properties. In the welded joints, there are different degrees of inhomogeneity in mechanical properties, and the mechanical properties of the weld metal and heat-affected zone are significantly different from those of the base metal. Conventional tensile tests can only obtain the overall strength and deformability, but cannot evaluate the local mechanical properties of different regions of the joint. The information of these local properties is obviously necessary to improve the welding process and improve the overall performance of the joint. In order to find a method that can accurately evaluate the local mechanical properties of materials, researchers at home and abroad have done related research. D.A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
Inventor 朱亮张爱华郝建明蒋小霞
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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