A tension-compression fatigue test device for multi-specimen bonded joints considering the effect of temperature

Abstract

The invention discloses a tension-compression fatigue test device for multi-specimen bonded joints considering the influence of temperature. Composed of tightening device, movable stopper device, and fixed stopper device, it can simultaneously apply tension and compression alternating loads in the full service temperature range to multiple bonded joints. Stretch and compress the test piece to eliminate the influence of non-axial loads, and because the device adopts a cross universal joint structure, it can avoid the instability of the test piece when it is compressed, and obtain the S-N curve under the standard symmetric cycle , At the same time, this device can carry out fatigue tests on 4 bonded joints at the same time.

Description

technical field [0001] The invention relates to the technical field of fatigue performance testing of bonded joints, in particular to a tension-compression fatigue test device for multi-specimen bonded joints considering the influence of temperature. Background technique [0002] Vehicles are subjected to dynamic alternating loads from many aspects during driving, which makes the body bonding structure prone to fatigue damage during long-term service, which seriously affects vehicle safety. At the same time, during the actual operation of the vehicle, the bonding structure of the vehicle body is often affected by factors such as temperature, humidity, salt spray, and ultraviolet rays. Different environmental factors have a greater impact on the performance of the bonding joint. Considering that sealants and coatings can be used to effectively reduce the influence of humidity, salt spray and ultraviolet rays, temperature has become the most important factor affecting the perf...

AI Technical Summary

Problems solved by technology

[0003] When studying the force of the adhesive in the actual structure, since the force analysis of the entire bonded structure cannot be carried out in the actual experiment, the force of the adhesive in the actual structure can only be simulated through the bonded joint

The main shortcomings and deficiencies of the current bonded joint fatigue test device are: the existing fatigue loading device can only apply loads in the shear direction and tensile direction to the bonded joint, and cannot make the bonded joint bear pressure, so the existing fatigue The device can only apply a cyclic load with r>0; the existing fatigue device is sensitive to non-axial load, and the specimen is easy to bear the non-axial load; when the existing fatigue device performs fatigue work on the specimen, the specimen stretches It is easy to shake and has a great impact on the life of the loading device; the existing fatigue loading device and test method are mainly aimed at normal temperature conditions, and the influence of temperature is not fully considered; the existing fatigue loading device can usually only load a single specimen; the existing The fatigue loading device can only load a single specimen, and the efficiency is low; the existing fatigue performance test method cannot realize the fatigue life prediction under any stress range within a certain temperature range under any cycle characteristics

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