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Reciprocating displacement type fatigue testing machine

A fatigue testing machine, displacement technology, applied in the direction of applying repeated force/pulsation force to test the strength of materials, etc., can solve the problem of unable to test fatigue and other problems

Active Publication Date: 2012-07-11
TONGJI UNIV ARCHITECTURAL DESIGN INST GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is impossible to test the fatigue problem caused by the tension and compression reversal of the main stress section caused by the change of the web shear stress of the flexural member

Method used

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  • Reciprocating displacement type fatigue testing machine
  • Reciprocating displacement type fatigue testing machine
  • Reciprocating displacement type fatigue testing machine

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Embodiment 1: as figure 1 , consists of tested steel beam 1, action wheel 2, connecting rod 3, double-acting oil cylinder 4, oil cylinder support 5, boom 6, load gravity block 7, working platform 8 and hydraulic pump 9, and action wheel 2 passes through the connecting rod 3 is connected to the double-acting cylinder 4, the double-acting cylinder 4 is connected to the cylinder support 5, the double-acting cylinder is connected to the hydraulic pump 9, and the hydraulic pump 9 is connected to the control system; one end of the boom 6 is connected to the axle of the action wheel 2, and the other end of the boom 6 is connected to The load gravity block 7; the action wheel 2 is located above the steel beam 1 to be tested, and can move back and forth on the steel beam 1 to be tested; the load gravity block 7 is inserted into the space position in the working platform 8. Design the steel beam 1 to be tested according to the steel beam to be tested, and arrange the support pos...

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Abstract

The invention relates to a reciprocating displacement type fatigue testing machine. The reciprocating displacement type fatigue testing machine comprises a tested steel beam, an acting wheel, a connecting bar, a double-acting oil cylinder, an oil cylinder support, a lifting rod, a load gravity block, a working platform and a hydraulic pump, wherein the acting wheel is connected with one side of the double-acting oil cylinder by the connecting bar; the double-acting oil cylinder is connected with the oil cylinder support and connected with the hydraulic pump; the hydraulic pump is connected with a control system; one end of the lifting rod is connected with a wheel axle of the acting wheel; the other end of the lifting rod is connected with the load gravity block; the acting wheel is positioned above the tested steel beam; and the load gravity block is inserted into a spatial position in the working platform. By using the reciprocating displacement type fatigue testing machine the restriction that the traditional fatigue testing machine only can test the positive stress variation induced fatigue is overcome and the bearing capability of the fatigue caused by bent member web shear stress inversion can be detected. The reciprocating displacement type fatigue testing machine provided by the invention has the following advantages that: the position of the acting force moves in a reciprocating way while the size and direction of the acting force is invariable; and the acting force is realized by a lifting rod pressurizing weight and small thrust and low testing energy consumption are required in the double-acting oil cylinder for driving the acting wheel.

Description

technical field [0001] The invention belongs to the field of civil engineering, and in particular relates to a reciprocating displacement fatigue testing machine. Background technique [0002] The fatigue problem is a problem that has not been well solved in the engineering field so far. One of the most effective ways to study fatigue problems is fatigue testing. But so far, the fatigue testing machine is to simulate the fatigue load in engineering by fixed-point orientation of force and pulse change of force magnitude. This simulation method can efficiently test the fatigue bearing capacity caused by the change of the normal stress (tensile and compressive stress) of the flexural member. However, it is impossible to test the fatigue problem caused by the tension and compression reversal of the main stress section caused by the change of the shear stress of the web of the flexural member. However, in current engineering practice, there are much more examples of fatigue fa...

Claims

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Application Information

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IPC IPC(8): G01N3/32
Inventor 马人乐何敏娟
Owner TONGJI UNIV ARCHITECTURAL DESIGN INST GRP CO LTD
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