Stress analysis of helicopter main rotor torsion bar

The results of stress analysis for the main rotor torsion bar of the ANSAT helicopter based on the finite element method are presented. The analysis was performed for the base types of loading in the linear statement. The analysis results agree well with the experimental data. © Allerton Press, Inc., 2009

Implementation of contact interaction in a finite - element formulation

© 2014 O. A. Sachenkov, V. I. Mitryaikin, T. A. Zaitseva and Yu. G. Konoplev. The paper presents a technique which makes it possible to take into account contact interactions between surfaces based on the finite element method. The technique is based on iterative cycles, determining statuses of the contact elements and renewing the contact forces to satisfy the condition of zero penetration of all active contact elements. The proposed technique allows us also to take account of friction between the contacting elements. The paper considers an example of implementing contact interaction with regard to friction between bodies, and solves a model problem

Stress analysis of helicopter main rotor torsion bar

The results of stress analysis for the main rotor torsion bar of the ANSAT helicopter based on the finite element method are presented. The analysis was performed for the base types of loading in the linear statement. The analysis results agree well with the experimental data. © Allerton Press, Inc., 2009

Stress analysis of helicopter main rotor torsion bar

The results of stress analysis for the main rotor torsion bar of the ANSAT helicopter based on the finite element method are presented. The analysis was performed for the base types of loading in the linear statement. The analysis results agree well with the experimental data. © Allerton Press, Inc., 2009

Stress analysis of helicopter main rotor torsion bar

The results of stress analysis for the main rotor torsion bar of the ANSAT helicopter based on the finite element method are presented. The analysis was performed for the base types of loading in the linear statement. The analysis results agree well with the experimental data. © Allerton Press, Inc., 2009

Implementation of contact interaction in a finite - element formulation

© 2014 O. A. Sachenkov, V. I. Mitryaikin, T. A. Zaitseva and Yu. G. Konoplev. The paper presents a technique which makes it possible to take into account contact interactions between surfaces based on the finite element method. The technique is based on iterative cycles, determining statuses of the contact elements and renewing the contact forces to satisfy the condition of zero penetration of all active contact elements. The proposed technique allows us also to take account of friction between the contacting elements. The paper considers an example of implementing contact interaction with regard to friction between bodies, and solves a model problem

Implementation of contact interaction in a finite - element formulation

© 2014 O. A. Sachenkov, V. I. Mitryaikin, T. A. Zaitseva and Yu. G. Konoplev. The paper presents a technique which makes it possible to take into account contact interactions between surfaces based on the finite element method. The technique is based on iterative cycles, determining statuses of the contact elements and renewing the contact forces to satisfy the condition of zero penetration of all active contact elements. The proposed technique allows us also to take account of friction between the contacting elements. The paper considers an example of implementing contact interaction with regard to friction between bodies, and solves a model problem

Implementation of contact interaction in a finite - element formulation

© 2014 O. A. Sachenkov, V. I. Mitryaikin, T. A. Zaitseva and Yu. G. Konoplev. The paper presents a technique which makes it possible to take into account contact interactions between surfaces based on the finite element method. The technique is based on iterative cycles, determining statuses of the contact elements and renewing the contact forces to satisfy the condition of zero penetration of all active contact elements. The proposed technique allows us also to take account of friction between the contacting elements. The paper considers an example of implementing contact interaction with regard to friction between bodies, and solves a model problem

Experimental substantiation of acetabular component impaction with uncoverage in arthroplasty of patients with severe hip dysplasia

Purpose. Estimation of critical value of acetabular component uncoverage enabling its implantation without an additional support. Methods. A comparative analysis of an original method for intraoperative measurement of uncoverage space of acetabular component based on the measurement of the depth of uncovered sector with X-ray control by the same technique was carried out. Mathematical computer modeling based on the finite element techniqueand the mechanical experiment were performed. Critical values of uncoverage enabling safe primary fixation of acetabular component were estimated in designed models. Results. High rate of coincidence of direct intraoperative and postoperative measurements by radiograms was obtained, testifying to the possibility of application of this technique of uncoverage estimation at the stage of preoperative X-ray planning in patients with different degree of dysplasia. Using the finite element technique and the mechanical experiment on pelvis models, a possibility of mounting anacetabular component with moderate uncoverage within 25% without screws and with significant uncoverage to 35% with additional two screws fixation was demonstrated