Abstract
The standard hydraulic cylinder consists of two main parts, i.e., cylinder tube and piston rod. It operates by the reciprocation of either element and majorly used to transmit mechanical power using fluid linkage. The failure of such systems occurs usually because of piston rod failure. Being more specific, the buckling failure mode is more dominant over others. In this manuscript, the maximum allowable load is calculated for a standard hydraulic cylinder with pin-mounted at both ends analytically using analytically using ISO/TS 13725. Piston rod having less flexural rigidity (EI) is prone to buckling failure. The estimated load when applied on the piston rod end results into the stress condition of the cylinder tube. Von-Mises stress generated in the thick cylinder is discussed using Lame’s theorem while axial and flexural stress for piston rod is deliberated. The results show that for lower slenderness ratio hydraulic cylinder may fail due to yielding of cylinder tube failure. The results obtained for slenderness ratio 19 of piston rod are compared with simulated results implemented in ANSYS.
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Abbreviations
- \( F_{s} \) :
-
Factor of safety
- P:
-
Axial force applied
- \( L_{c} \) :
-
Length of the cylinder tube
- \( L_{\text{p}} \) :
-
Exposed length of the piston rod
- \( L_{ph} \) :
-
Width of the piston head
- \( L_{\text{s}} \) :
-
Distance between piston head center to piston rod bearing
- \( e_{p} \) :
-
Eccentricity of force at the piston rod
- \( e_{c} \) :
-
Eccentricity at cylinder bottom
- \( R_{{c_{1} }} \) :
-
Reaction at the pin-end of the cylinder tube
- \( R_{j} \) :
-
Reaction at the junction of cylinder tube and piston rod
- \( R_{{p_{1} }} \) :
-
Reaction at the pin-end of the piston rod
- \( M_{j} \) :
-
Moment at the junction of cylinder tube and piston rod
- \( \beta \) :
-
Angle between deflection curves of cylinder tube and piston rod
- \( \psi_{{c_{1} }} \) :
-
Angle at the pin-end of the cylinder tube
- \( \psi_{{p_{1} }} \) :
-
Angle at the pin-end of the piston rod
- \( \varphi_{{c_{1} }} \) :
-
Angle of deflection curve at the pin-end of the cylinder tube
- \( \varphi_{{c_{2} }} \) :
-
Angle of the deflection curve at the end of cylinder tube
- \( \varphi_{{p_{1} }} \) :
-
Angle of deflection curve at the pin-end of the piston rod
- \( \varphi_{{p_{2} }} \) :
-
Angle of the deflection curve at the beginning of piston rod
- \( D_{{{\text{c}}_{i} }} \) :
-
Inside diameter of the cylinder tube
- \( D_{{c_{e} }} \) :
-
Outside diameter of the cylinder tube
- \( d_{\text{p}} \) :
-
Outside diameter of the piston rod
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Acknowledgements
This research was supported/partially supported by Research and Development (Engrs.), Defence Research and Development Organization, Pune, India under the project cobtract No. “RDE/FPG/CARS2016-17/10 (N 21676)”. We thank our counterpart team from DRDO, Pune who provided insight and expertise that greatly assisted the research.
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Jatin, P. et al. (2019). Estimation of Load Carrying Capacity for Pin-Mounted Hydraulic Cylinders. In: Prasad, A., Gupta, S., Tyagi, R. (eds) Advances in Engineering Design . Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-13-6469-3_16
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DOI: https://doi.org/10.1007/978-981-13-6469-3_16
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