Three-point bending fatigue testing machine

Abstract

The invention provides a three-point bending fatigue testing machine which comprises an alternating current servo motor, a rotary table, a bearing, a transmission device, a guide rail, a spring sleeve assembly, a force sensor, a pressing head, a fixture and a test bench bed. The alternating current servo motor is fixedly arranged on the test bench bed and connected with the transmission device through the rotary table. One end of the transmission device is sleeved with the bearing, and the other end of the transmission device is connected with the spring sleeve assembly. The spring sleeve assembly is fixedly connected with the force sensor through bolts. The other side of the force sensor is fixedly connected with the pressing head through bolts. The fixture is fixedly arranged on the test bench bed and can be manually adjusted to be folded and unfolded and lifted. The three-point bending fatigue testing machine is simple in structure, low in cost and capable of conducting three-point bending fatigue tests according to different specifications, the pre-applied force and the loading amplitude are freely adjusted, a loading mode of high frequency can be met, and practicability is high.

Description

technical field [0001] The invention relates to a testing machine, in particular to a three-point bending fatigue testing machine, which belongs to the technical field of testing equipment. Background technique [0002] In the application of engineering materials, their mechanical properties are generally tested. In addition to the conventional mechanical properties, the fatigue performance of materials is also a very important indicator. When a material or component is subjected to repeated or alternating loads, although the load amplitude of the material or component is much smaller than its tensile strength or yield The strength is even less than the elastic load, but after repeated deformation and accumulation, the final fracture damage is usually caused by fatigue load. According to statistics, about 50-90% of mechanical structure damage is fatigue damage, and the phenomenon of fatigue damage is extremely widespread. [0003] At present, most of the three-point bending...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of three-point bending fatigue testing machine for the deficiency of existing three-point bending fatigue testing technology

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