A fatigue test clamp

Abstract

A fatigue test fixture, comprising: a clamping part, formed with a clamping groove, and the clamping groove has a side wall extending along a first direction, wherein the first direction is perpendicular to the stress direction of the clamp during the test; the coupling part, It has a coupling surface; at least one first spring steel sheet group is connected between the side wall of the slot and the coupling surface of the coupling part, and is parallel to the second direction, and the second direction is the same as that of the fixture during the test. The direction of force is parallel; wherein, the first spring steel sheet group includes at least one first spring steel sheet. Utilizing the characteristic that the spring steel sheet has strong rigidity along its plane direction and low bending rigidity in the direction perpendicular to its plane, the fixture has better flexibility and avoids the over-constraint between the test fixture and the parts during the test. Bending moment, proper decoupling of the over-constraint between the fixture and the test part improves the accuracy of the experimental data.

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] like 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 of ...

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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