Kalça Protezlerinde Loft Tasarım Aracı Kesit Değişimlerinin Gerilme Miktarı Üzerine Etkilerinin İncelenmesi

Year 2020, Volume: 7 Issue: 2, 837 - 849, 30.12.2020

Özkan Küçük , Burak Öztürk

https://doi.org/10.35193/bseufbd.706661

Abstract

Kalça eklemlerinde ileri derecede hasar oluşmuş hastalarda, kalça protezleri hasarlı eklemin yapay bir eklem olarak değiştirilmesi sonucunda kullanılmaktadır. Kalça protezi, kobalt krom veya titanyumdan imal edilen ana parçalar ile bunların eklemleştiği yerde plastik, metal veya seramik ara parçalardan oluşmaktadır. Kalça protezleri ve uygulamaları ile ilgili birçok tasarımsal problemin olduğu bilinmektedir. Bu sorunların çözümü hedeflenerek, endüstriyel tasarıma sahip üç farklı tip tasarım geometrisi seçilmiş ve Catia V5 programı ile modellenmiştir. Bu protezlerin ve femurun montaj tasarımına etkiyen kuvvetler dikkate alınarak, emniyet katsayısı değerleri, sonlu elemanlar yönteminde, mühendislik gerilmeleri altında hesaplanmıştır. Bu hesaplamalar dikkate alındığında üç farklı endüstriyel tasarım içinden hacim oranı düşük olup gerilme miktarı diğer tasarımlara göre daha düşük olan tasarım tipi belirlenmiştir. Bu tasarımın 6 farklı kesiti içine alan bir loft tasarım aracı ile modellenebileceği gözlemlenmiştir. Bu kesitlerde yer alan profillerin ölçü değişimi ana tasarım geometrisinden 1 mm ofset yapılarak modellenmiştir. Bu modelleme yapılırken Taguchi L8 deney tasarımı kullanılmıştır. Böylece her bir kesitin mukavemet ve hacim özelliklerine etkisi istatiksel yöntemler kullanılarak incelenmiştir. Tersine mühendislik ile tasarlanan bu protezlerin hacim miktarı 31285 ile 18438 mm3 ölçüleri arasında değişkenlik göstermektedir. Minimum hacim ve maksimum emniyet katsayısı elde edilebilmesi için gerekli tasarım seçimleri bu sonuçlar dikkate alınarak yapılmıştır. Minimum tasarım için deney tasarımı parametreleri A2, B1, C1, D2, E1, F1 olarak belirlenmiştir. Bu sonuçlara göre hacim 17975mm3 ve gövde de oluşan maksimum gerilme 774 MPa olarak bulunmuştur. Böylece hacim miktarı %4 oranında azaltılırken emniyet katsayısı ise %8 oranında artırılmıştır. Bu sonuçlar dikkate alındığında maksimum emniyet minimum hacim miktarı için elde edilmiştir.

Keywords

Kalça Değiştirme, Tasarım Optimizasyonu, Sonlu Elemanlar Yöntemi, Taguchi Yöntemi, Parametrik Tasarım

Supporting Institution

Bilecik Şeyh Edebali Üniversitesi

Project Number

2018-01.BŞEÜ.03-04

Thanks

Bu çalışma, Bilecik Şeyh Edebali Üniversitesi Bilimsel Araştırma Projeleri Komisyonu tarafından desteklenen 2018-01.BŞEÜ.03-04 numaralı proje kapsamında yürütülmüştür. Yazarlar, Bilecik Şeyh Edebali Üniversitesine mali desteklerinden dolayı teşekkür etmektedir

Investigation of the Effects of Loft Design Tool Cross-Section Changes on Stress Amount in Hip Prosthesis

Abstract

In patients with severe damage to the hip joints, hip prostheses are used as a result of replacing the damaged joint as an artificial joint. The hip prosthesis consists of main parts made of cobalt chrome or titanium and plastic, metal or ceramic spacers where they join. It is known that there are many design problems related to hip prostheses and their applications. With the aim of solving these problems, three different types of design geometry with industrial design were selected and modeled with the Catia V5 program. Considering the forces affecting the assembly design of these prostheses and femur, the safety coefficient values were calculated under engineering stress in the finite element method. Considering these calculations, among three different industrial designs, the design type whose volume ratio is low and the stress amount is lower than the other designs was determined. It has been observed that this design can be modeled with a loft design tool that includes 6 different sections. The size variation of the profiles in these sections is modeled by making 1 mm offset from the main design geometry. Taguchi L8 experimental design was used for this modeling. Thus, the effect of each section on the strength and volume properties has been analyzed using statistical methods. The volume of these prostheses designed with reverse engineering varies between 31285 and 18438 mm3. Necessary design choices were made by taking these results into consideration in order to obtain minimum volume and maximum safety coefficient. Experimental design parameters for the minimum design were determined as A2, B1, C1, D2, E1, F1. According to these results, the volume was found to be 17975mm3 and the maximum stress on the body as 774 MPa. Thus, the volume amount was reduced by 4%, while the safety factor was increased by 8%. Considering these results, the maximum safety has been obtained for the minimum amount of volume.

Keywords

Hip Replacement, Design Optimization, Finite Elements Method, Taguchi Method, Parametric Design

Project Number

2018-01.BŞEÜ.03-04

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