Abstract
A closed loop servo-hydraulic structural fatigue testing machine was developed. It can apply fatigue loads on actual engineering parts or components for their fatigue strength evaluation. The testing machine consists of a structural bending load frame, a structural torsion load frame, a hydraulic system, and a control system. Stress analysis and design for the crosshead, columns and test bed for the structural bending test frame are described. Finite element analysis was performed for the structural torsion load frame. Evaluation of the structural load frames and application of the test machine are briefly given.
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Abbreviations
- f :
-
Material fringe value
- m :
-
number of cylinders
- n :
-
Number of columns
- P h :
-
Hydraulic pressure in the clamping cylinder
- B :
-
Thickness of the crosshead
- D c :
-
Inner diameter of clamping cyclinder
- D r :
-
Diameter of rod
- E :
-
Young's modulus
- F :
-
Force exerted by clamping cylinders
- I zz :
-
Second moment of inertia about z-axis
- L :
-
Length of the column.
- M max :
-
Maximum bending moment
- N :
-
Fringe order
- P :
-
Maximum force exerted by the acutator
- P θ :
-
Pressure distribution on the clamping surface
- R :
-
Radius of column
- T :
-
Thickness of the clamping part defined in Fig. 5(c)
- T max :
-
Maximum distance from the bending axis
- V θ :
-
Vertical force at angle θ induced byF
- U :
-
Strain energy of the clamping part by moment and forces acting on it
- W :
-
Weight of the corsshead
- δ θ :
-
Vertical deflection at angle θ
- σ B :
-
Buckling stress
- δ c :
-
Compressive strength of the material
- μ:
-
Friction coefficient between crosshead and column
- ν :
-
Poisson's ratio
- p :
-
Prototype
- m :
-
Model
References
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Lee, SB. Stress analysis and design for a structural fatigue testing machine. KSME Journal 5, 115–124 (1991). https://doi.org/10.1007/BF02953610
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DOI: https://doi.org/10.1007/BF02953610