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Fatigue testing machine capable of applying complex coupling acting force, and control circuit of fatigue testing machine

A fatigue testing machine and fatigue testing technology, applied in the field of fatigue testing machines, can solve problems such as difficult movement, large volume, and single method of applying loads, and achieve the effects of avoiding repeated handling, simplifying the testing process, and saving manpower

Active Publication Date: 2019-07-23
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current steel bridge fatigue tests mainly use large-scale MTS fatigue test loaders, but due to their large volume, it is difficult to move, and the method of applying loads is single, it is difficult to reflect the effects of bending, shearing, bending and torsion in real bridges, and the cost is relatively high. High, for the fatigue test that requires a large amount of data, its economy and practicability are poor

Method used

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  • Fatigue testing machine capable of applying complex coupling acting force, and control circuit of fatigue testing machine
  • Fatigue testing machine capable of applying complex coupling acting force, and control circuit of fatigue testing machine
  • Fatigue testing machine capable of applying complex coupling acting force, and control circuit of fatigue testing machine

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 As shown, a fatigue testing machine capable of applying complex coupling forces includes a gantry 1, and a specimen fixing frame 2 is provided between the two vertical arms of the gantry 1; The horizontal slideway mechanism 3 at the distance between the gantry 1 and the specimen fixing frame 2, the vertical arm of the gantry 1 is provided with a vertical lifting mechanism 4, and the vertical lifting mechanism 4 is provided with a fatigue test power mechanism 5, and the fatigue test power The mechanism 5 is provided with a spacing adjustment mechanism 6; it also includes a testing machine control system 7 (not marked in the figure) for controlling the vertical lifting mechanism 4, the fatigue test power mechanism 5 and the spacing adjustment mechanism 6 to work.

[0022] The horizontal slideway mechanism 3 includes rails 31 that are left and right opposite on the bottom surface and rollers 32 arranged on the bottom of the gantry 1. The gantry 1 moves alo...

Embodiment 1-1

[0032] Example 1-1: Effect of variable amplitude loading

[0033] Close S1 and S2, open S3, the two vibration motors 52 are connected in parallel, and the frequency modulation circuit, phase angle circuit and steering circuit can be adjusted arbitrarily, so that the vibration curves of the two motors 44 can be superimposed arbitrarily to form a variable amplitude loading effect. Strain gauges are arranged at the measured position, and the time-history strain in the test process is obtained through strain monitoring. The fatigue stress spectrum is obtained by rainflow counting method, that is, different stress amplitudes and their corresponding cycle times are applied to the specimen under variable amplitude loading. research on fatigue performance.

Embodiment 1-2

[0034] Example 1-2: Bending moment action

[0035] Close S3, open S1 and S2, and connect the two vibration motors 52 in series; respectively adjust the frequency modulation circuit and the phase angle circuit to keep the vibration frequency and phase angle of the two motors 44 consistent. Adjust the steering circuit, and set the steering of the centrifugal blocks 53 of the two vibrating motors 52 to reverse; the rotation direction of the motor eccentric blocks and the force generated on the test piece can be seen Figure 6 , the same vertical force produces a bending moment, and the opposite horizontal forces cancel each other out, thus forming a bending moment in the weld. Strain gauges are arranged at the measured position, and the normal stress of the tested part of the test piece is obtained through strain monitoring. To study the fatigue performance of the specimen under the action of bending moment, the formula is:

[0036] M=2mπfr 2 L 1

[0037] Wherein, the bendin...

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Abstract

The invention discloses a fatigue testing machine capable of applying complex coupling acting force. The fatigue testing machine comprises a gantry, and a test piece fixing frame is arranged between two vertical arms of the gantry. The fatigue testing machine is characterized in that a horizontal sliding way mechanism used for adjusting the distance between the gantry and the test piece fixing frame is arranged between the gantry and the bottom face, a vertical lifting mechanism is arranged on the corresponding vertical arm of the gantry, a fatigue test power mechanism is arranged on the vertical lifting mechanism, and a spacing adjustment mechanism is arranged on the fatigue test power mechanism; and the fatigue testing machine further comprises a testing machine control system used for controlling the vertical lifting mechanism, the fatigue test power mechanism and the spacing adjustment mechanism to work. The fatigue testing machine is small in size and convenient to move, and can apply the coupling effect of complex loads of different ratios, the complex stress conditions in a real bridge can be simulated better, and the testing basis is provided for the study of fatigue performance.

Description

technical field [0001] The invention relates to a fatigue testing machine for applying complex coupling force. Background technique [0002] The structure and stress of the steel bridge deck are complex, and it is prone to fatigue damage under the action of reciprocating vehicle loads. Fatigue damage is an important factor affecting the operation safety of steel bridges. Relevant studies have shown that steel bridge deck members are often subject to complex coupling forces. For example, under the action of vehicle loads, the cracked roof and U-rib welds will produce vertical bending and obvious cyclic axial forces along the direction of the welds. The effect, that is, the coupling effect of bending moment and axial force; the complex force effect on the curved bridge is more obvious. Due to the particularity of the bridge type, the components of the curved bridge usually bear a series of factors such as the joint action of bending moment and torque. The structural details o...

Claims

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Application Information

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IPC IPC(8): G01N3/38G01N3/02
CPCG01N3/02G01N3/38G01N2203/0005G01N2203/0026G01N2203/005G01N2203/0073
Inventor 吉伯海傅中秋姚悦王秋东
Owner HOHAI UNIV
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