Stress Analysis of Threaded Shaft Pin Fracture
The threaded shaft pin is an important component of mechanical equipment, and its fracture always affects the normal operation of machinery and equipment. In this paper, a threaded pin failure occurred on a certain large machine is taken as an example, and the analysis and study of the stress of the pin are carried out.
The study focused on the analysis and calculation of the stress distribution and strain of the threaded pin after being subjected to tension and twist. The finite element model was established and the static strength analysis was performed, and the theoretical mechanical properties of the material were obtained by considering the connector material. In the simulation process, the contour map and deformation of the joint were analyzed.
The simulation results show that the maximum tensile stress of the threaded pin is 331.8 MPa, which is 67% higher than the yield strength of the material. Under the combined action of tension and torsion, the maximum tensile stress is mainly distributed at the two ends of the threads, and the axial strain is slightly larger at the two ends. At the same time, the mechanical properties of the material have a great influence on the tensile strength of the thread pin.
The analysis of the numerical simulation result shows that the thread pin is in a tensile state and meets the failure condition. From the comparison of the numerical simulation result with the model structure and the actual failure form of the real component, it is found that the model structure reasonably accurately reflects the actual fragmentation state of the thread shaft pin in the real component.
In summary, the stress analysis of the threaded shaft pin fracture in this paper is based on the numerical simulation method, and the accuracy and correctness of the simulation result can be guaranteed to a certain extent. Combined with the real testing and actual component visual observation and other methods, it can be inferred that the failure of the thread pin is caused by the local stress concentration caused by uneven distribution of stress. The reason for the uneven stress distribution may be caused by improper design of the threaded pin assembly or improper selection of the material.
