CN201340373Y - Dynamic calibration device of crystal shearing stress meter - Google Patents

Abstract

The utility model provides a dynamic calibration device of a crystal shearing stress meter, which realizes the reliable calibration for the shearing coefficient of the crystal shearing stress meter. The dynamic calibration device comprises a trip rod, a loading incident rod, a loading transmission rod, strain gage and two metal gaskets, wherein the strain gage is stuck on the surface of the loading transmission rod by an epoxy glue; the crystal shearing stress meter to be calibrated is stuck between the two metal gaskets by the epoxy glue; the trip rod is used for impacting the loading incident rod coaxially to generate loading pulse; and the loading incident rod serves as the wave guide rod to transmit the loading pulse to the metal gaskets and the crystal shearing stress meter to be calibrated.

Description

A kind of crystal shear stress meter dynamic calibration apparatus

Technical field

The utility model relates to a kind of caliberating device, particularly relates to a kind of device of dynamic calibration crystal shear stress meter shearing factor.

Background technology

Modern dynamic load experiment is the important component part in solid mechanics, the material mechanics experiment.According to the experiment demand, need to select different shear stress meters that shear stress is tested in the dynamic shearing loading experiment, wherein crystal shear stress meter is important a kind of taseometer.Dynamic calibration to crystal shear stress meter is the preceding important step of experiment.

At present, for static demarcating, there is difficulty in dynamic calibration crystal shear stress meter on experimental technique, show mainly how the reliable and stable crystal shear stress meter to being demarcated loads, and how accurately to measure the dynamic load that is applied on the crystal shear stress meter.

The utility model content

The technical problems to be solved in the utility model provides a kind of crystal shear stress meter dynamic calibration apparatus, realizes the reliable demarcation to crystal shear stress meter shearing factor.

The technical solution of the utility model is: crystal shear stress meter dynamic calibration apparatus is by drop bar, and loading incident bar, two backing metals, loading transmission bar, foil gauges are formed.Drop bar, loading incident bar are the identical right cylinders of diameter with loading transmission bar; The two ends of drop bar are smooth flat, and wherein the smooth flat of an end loads incident bar as the coaxial bump of striking face; An end that loads incident bar is a smooth flat, this smooth flat is corresponding to drop bar striking face, the other end that loads incident bar is L type nick shaped, breach two planes are respectively with to load the incident bar axis vertical and parallel, are pasted with the backing metal identical with plane sizes on the breach plane of parallel and axis; The length and the two ends shape that load transmission bar are identical with the loading incident bar, and are being pasted with identical backing metal with the same position place that loads incident bar; Crystal shear stress meter to be calibrated is pasted between two backing metals; Foil gauge is pasted on the surface that loads transmission bar axial direction position placed in the middle.

The utility model can be obtained following beneficial effect:

The utilization of this device loads incident bar and transmission bar is the pulse propagation guide rod, design by L type breach and backing metal, the compression pulse that the drop bar bump is loaded the incident bar generation is converted into being pasted on the shearing loading of the crystal shear stress meter between the L type breach backing metal, the foil gauge test that utilization is pasted on loading transmission bar surface sees through the shear stress meter and enters the compression stress that loads transmission bar, and then obtain to be applied to the size of shear-type load on the shear stress meter, realize demarcation to shearing factor.This apparatus structure is simple, good reliability, and the dynamic shearing coefficient that can be widely used in various crystal shear stress meters is demarcated.

Description of drawings

Fig. 1 is an apparatus structure synoptic diagram of the present utility model;

Fig. 2 is the a-a of L type indentation, there ₁The left pseudosection at interface.

Embodiment

Below in conjunction with accompanying drawing the utility model is elaborated.

As shown in Figure 1, composition of the present utility model comprises, drop bar 1 loads incident bar 2, loads transmission bar 3,4, two backing metals 5 of foil gauge.Foil gauge 4 usefulness epoxy glues are pasted on the surface that loads transmission bar 3, and shear stress meter 6 usefulness epoxy glues to be calibrated are pasted between two backing metals 5.An end that loads incident bar 2 is L type nick shaped, as shown in Figure 2.Drop bar 1 is used for coaxial bump and loads incident bar 2 generation load pulses.Load incident bar 2 and load pulses is passed to backing metal 5 and crystal shear stress meter 6 to be calibrated as waveguide rod.

The following describes and use the utility model device to carry out the process of crystal shear stress meter shearing factor dynamic calibration.

Drop bar 1 bump loads incident bar 2, imports a compression-loaded pulse into to loading incident bar 2.When the compression-loaded pulse passed backing metal 5, by cementing agent the pure shear that the part compression pulse is converted into being pasted on the crystal shear stress meter 6 between the backing metal is loaded, another part compression pulse then reflected back loads incident bar 2.The compression pulse part that is converted into the pure shear loading obtains by being pasted on foil gauge 4 tests that load on the transmission bar 3, and the shearing force F that acts on the crystal shear stress meter 6 can be expressed as:

F=AE ε _t(formula one)

Wherein, A, E are respectively cross-sectional area and the elastic modulus that loads transmission bar 3, ε _tFor foil gauge 4 is tested the strain signal that obtains.And crystal shear stress meter 6 self is subjected to behind the shearing force F output voltage Δ U, both existence relation:

$F=\frac{\mathrm{\ΔU}}{d}$ (formula two)

Wherein, d is a shearing factor to be calibrated.

Then the dynamic calibration value that can obtain crystal shear stress meter 6 shearing factor d by formula one and formula two formulas is:

$d=\frac{\mathrm{\ΔU}}{E{\mathrm{\ϵ}}_{t}A}$ (formula three)

Finish dynamic calibration thus to shearing factor.

Claims (2)

1. a crystal shear stress meter dynamic calibration apparatus loads incident bar (2), two backing metals (5), loading transmission bar (3), foil gauge (4) composition by drop bar (1); Drop bar (1), loading incident bar (2) are the identical right cylinders of diameter with loading transmission bar (3); The two ends of drop bar (1) are smooth flat, and wherein the smooth flat of an end loads incident bar (2) as the coaxial bump of striking face; An end that loads incident bar (2) is a smooth flat, this smooth flat is corresponding to drop bar (1) striking face, the other end that loads incident bar (2) is L type nick shaped, breach two planes are vertical and parallel with the axis that loads incident bar (2) respectively, are pasted with the backing metal identical with plane sizes (5) on the breach plane of parallel and axis; The length and the two ends shape that load transmission bar (3) are identical with loading incident bar (2), and are being pasted with identical backing metal (5) with the same position place that loads incident bar (2); Foil gauge (4) is affixed on the surface that loads transmission bar (3) axial direction position placed in the middle.

2. crystal shear stress meter dynamic calibration apparatus as claimed in claim 1 is characterized in that crystal shear stress meter (6) to be calibrated is pasted between two backing metals (5).

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