Numerical and Experimental Investigation of Bending Strength of Ti6Al4V Titanium Screw in Femur Bone

Subject Areas :

Ali Fata ¹ , Peyman Mashhadi Keshtiban ^{2 *}

1 - Assistant Professor, Department of Mechanical Engineering, University of Hormozgan, Bandar Abbas, Iran.
2 - Associate Professor, Department of Mechanical Engineering, University of Urmia, Urmia, Iran.

Received: 2024-08-16 Accepted : 2024-12-15 Published : 2025-09-15

Keywords: Finite Element Bending Test Femur Bone,

Abstract :

Orthopedic screws, which are used to connect orthopedic implants, always play an important role in increasing strength and resistance to bone fracture. Without screws, the use of many fixation devices such as bone plates, intramedullary nails and even some common prostheses will be less effective or even impossible. During application and after closing the implants, screws under pressure are subjected to various bending, tensile or compressive loads, and as a result, they must have an elastic deformation within the permissible range in the direction of the applied loads. In order to accurately check the performance of the screw, in this work, the bending strength of the titanium orthopedic screw was investigated using the finite element method, and the results obtained were compared and confirmed with experimental tests. The behavior of the bolt in the bending test was discussed in terms of stress, force and displacement. Comparing the maximum force results shows a 16% difference between simulation and practical work in bending loading. Since the bending moment exerts more forces on the outer regions, it was concluded that the bone surface shows the maximum stress in the thinnest part of the inner thread. Due to the discontinuity of the connection of the screw thread with the bone, in the lower closed area, a high amount of stress occurs at the tip of the screw. Similar to the upper threaded part, the maximum stress values for the bone are also located in the upper part.

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