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Device and method for measuring minimum diameter of diameter shrinkage portion of tensile sample after fracture

A technique for tensile specimen and diameter measurement, applied in the field of mechanical test technology, mechanical measurement, and sensor, and can solve problems such as being unsuitable for measuring the smallest diameter

Active Publication Date: 2014-08-20
NINGBO YINZHOU FUCHUN PRECISION CASTING
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Problems solved by technology

However, due to the limitation of the sample positioning method adopted, this measuring instrument is not suitable for measuring the minimum diameter of the shrinkage part of the metal tensile sample after fracture, and there is a contact offset error

Method used

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  • Device and method for measuring minimum diameter of diameter shrinkage portion of tensile sample after fracture
  • Device and method for measuring minimum diameter of diameter shrinkage portion of tensile sample after fracture

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with accompanying drawing.

[0041] refer to figure 1 — Figure 8 , the device for measuring the minimum diameter of the shrinkage part of the tension sample after fracture of the present invention includes a sensor 1, a support 2, a compression spring 3, a standard device and a data acquisition instrument;

[0042] The sensor 1 has a U-shaped elastic body 4, two blade blocks 5, a positioning column 6, a guide rod 7 and four uniaxial resistance strain gauges R 1 , R 2 , R 3 and R 4 ; U-shaped elastic body 4 is symmetrical in shape, and its structure includes a base B and a left variable cross-section cantilever beam B fixedly connected to both ends of the base B 1 and the right variable section cantilever beam B 2 , the left cantilever beam with variable cross-section B 1 and the right variable section cantilever beam B 2 The cross-section is rectangular, and from the free end a to the root e, ...

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Abstract

The invention relates to a device and method for measuring the minimum diameter of a diameter shrinkage portion of a tensile sample after fracture. The device comprises a resistance-strain U-shaped sensor with a positioning rod and a measurement clamping tool edge, a U-shaped support, a plurality of standard units of standard cylinders and a data collector provided with measurement software. The sensor is installed on the standard cylinders or the tensile failure sample through cooperation of the positioning rod and the support, a measurement signal containing a standard diameter value or the minimum diameter value of the diameter shrinkage portion of the sample and the contact offset of the measurement clamping tool edge is transmitted to the data collector; a standardization algorithm of the measurement software provides a diameter fitting formula, and contact offset errors caused by different diameters of the standard cylinders are eliminated; a measurement algorithm of the measurement software provides a diameter value of the sample, and the contact offset errors caused by different diameters of the sample are eliminated.

Description

technical field [0001] The invention relates to a measuring device and method for the diameter after fracture, which is used for measuring the minimum diameter of the radial shrinkage part of the circular cross-section metal tensile specimen after fracture in the material mechanical performance test, measuring the central section diameter of the curve variable cross-section fatigue specimen, and measuring the busbar for The invention relates to measuring the diameter of circular shaft parts such as curved shafts and stepped shafts, belonging to the technical fields of sensors, mechanical testing technology and mechanical measurement. Background technique [0002] In the test of tensile mechanical properties of metal materials, in order to obtain the reduction of area of ​​the material, it is necessary to measure the minimum diameter of the shrinkage part of the sample after fracture. At present, a vernier caliper is generally used for measurement. The resolution of the verni...

Claims

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Application Information

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IPC IPC(8): G01B7/12
Inventor 鲁阳高文通吕荣坤
Owner NINGBO YINZHOU FUCHUN PRECISION CASTING
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