Fatigue test fixture

Abstract

A fatigue test clamp includes a clamping part provided with a card slot with a side wall extending along a first direction, a coupling part provided with a coupling surface, at least a first spring steel sheet group connected between the side wall of the card slot and the coupling surface of the coupling part and being parallel to a second direction, wherein the first direction is perpendicular to a stress direction of the clamp during testing, the second direction is parallel to the stress direction of the clamp during testing, and the first spring steel sheet group comprises at least one first spring steel sheet. By utilizing characteristics of the spring steel sheet that the spring steel sheet is high in rigidity at the plane direction and low in bending rigidity in a direction perpendicular to the plane direction, the clamp is good in flexibility, a bending moment generated due to over-constraint between the test clamp and a component in a testing process is avoided, the over-constraint between the test clamp and the component is decoupled properly, and accuracy of experiment data is improved.

Description

technical field [0001] The invention relates to the field of test fixtures, in particular to a fatigue test fixture for a suspension arm of an automobile power assembly. Background technique [0002] The powertrain suspension system of a car is one of the most important safety components of a car. Its main function is to connect the powertrain of the car including the engine and gearbox to the body or frame through the suspension arm (or bracket). [0003] Such as figure 1 Shown is a schematic diagram of the three-dimensional structure of an engine suspension arm. The base end A of the suspension arm 1 is connected to the powertrain of the vehicle through the bolt hole 2, and the arm end B opposite to the base end is connected to the body or frame. End B is coupled to the body or frame by a suspension of rubber material. In the actual stress situation, the suspension arm 1 bears the load generated by the driving torque of the engine along the forward or backward direction ...

AI Technical Summary

Problems solved by technology

However, the fixture 3 itself is rigid, and the connection between the suspension arm 1 and the fixture 3 is also a rigid connection. These two factors cause the degree of freedom between the suspension arm 1 and the fixture 3 to be constrained, that is, α = β, the force F applied by the force-applying device will cause the suspension arm 1 to be subjected to the bending moment M1, and the clamp 3 to be subjected to the bending moment M2

Among them, the bending moment M1 will cause the failure mode of the suspension arm 1 to be inconsistent with the actual situation, resulting in the inability to accurately predict the fatigue life of the suspension arm 1 through the fatigue test, and the bending moment M2 may damage the fixture connected to the fixture 3. power equipment

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