Simulation pull-out process of medical screw from the bone in Abaqus- Damage investigation

In this tutorial, the Simulation pull-out process of the medical screw from the bone in Abaqus- Damage investigation- has been studied. This type of threaded fastener is primarily screwed into the bone without any tension in the screw or clamping force in the bone. Applications include neck and spine injuries, as well as hip and knee replacements. The strength of the screw connection is one of the main concerns in the post-surgery recovery and the long term mobility of the patient. Hence, it is important that a high reliability level is ensured for those self-tapping screws used in medical devices. The bone is modeled as a three-dimensional solid part. The screw is imported to the Abaqus because of complex geometry as a rigid part. You can see a figure of the assembled parts below

The Johnson-Cook hardening law is frequently applied to analyze the dynamic behavior of metal alloys. This hardening law is generally pre-implemented in FE codes, including ABAQUS/Explicit. To model bone behavior under dynamic load, the elastic and Johnson-Cook plasticity is used. To consider the damage parameter the Johnson-Cook damage criterion is used. The contact zone between bone and screw has experienced damage and failure under dynamic pull-out. The dynamic explicit step is appropriate for this type of analysis. The mass scale technique to reduce the time of the simulation is used. To consider failure and erosion on the contact zone, the general contact capability which considers the erosion as an input file is implied. The fixed boundary condition is assigned to the bone and axial displacement without rotation to the screw. The mesh should be fine at the contact zone to achieve good results

After the simulation all results such as damage, failure, stress, strain, ….are achievable. You can see some figures for the results below

You can provide CAE ,INP,and English video files of this simulation here. The cost of these files is Twenty-Seven Euros. you can click on the bellow bottom to beginning process

You can purchase the tutorial through a PayPal account, a Visa, or a Master card,  just before payment,send me an email to this address: karampourp@gmail.com