This study aims to find which lattice type and which ingredient is the best for the bone lattice for future grafting operations. Four types of lattice parts with micro and high porosity were designed to resemble the human bone structure and reach its light-weight and high surface area properties. Hydroxyapatite (HA) and tricalcium phosphate (TCP) were used in the photopolymer resin mixture for (Digital Light Processing) DLP 3D printing to give high bioactivity capability to the parts. In conclusion, microporosity HA-and TCPdoped parts were printed successfully with the DLP technique. Bioactivity tests were carried out with parts that were soaked in simulated body fluid (SBF). There is no significant weight difference in lattice parts in the time. Four weeks are sufficient time for the test. End of 2 weeks, calcium phosphate particles with around a diameter of 50-75 lm, and end of 4 weeks, calcium phosphate particles with around a diameter of 80-225 lm were observed. Apatite precipitation areas were grown on the surface in time. SEM and XRD results indicate that HA-doped and TCP-doped specimens are bioactive. A more mass increase was observed in the HA-doped specimen compared to the TCP-doped specimen.
Bu çalışmada, ankastre bir kiriş Ansys programında 3 boyutlu olarak modellenmiştir ve kirişe 5 kN’lik bir giriş kuvveti uygulanarak kirişin serbest ucunda meydana gelen yer değişimleri kaydedilmiştir. Kirişe uygulanan giriş kuvveti ve kirişin serbest ucunda oluşan yer değişimine ait çıkış veri seti kullanılarak literatürde dinamik sistemlerin modellenmesinde başarıyla uygulanmış Genetik Algoritmalar ve Parçacık Sürüsü Optimizasyonu yöntemleri ile ayrık zamanlı titreşim modelleri elde edilmiştir. Titreşim modellerinin modelleme başarısını içeren sonuçlar tablo halinde sunulmuştur. Ayrıca, Ansys programından alınan titreşim verisine ait harmonikler ve ayrık zamanlı modellere ait harmonikler Matlab/Simulink ortamında elde edilmiştir. Ayrık zamanlı titreşim modellerinin çıkış grafikleri ve harmonikleri incelendiğinde kirişin çıkış grafikleri ve harmoniklerine oldukça yakın olduğu tespit edilmiştir. Ayrık zamanlı modellerin kirişin titreşim davranışını başarıyla temsil ettiği görülmüştür.
This study aims to design and manufacture different lattices and evaluate their success in terms of compression strength. Structures with a high surface area to volume (SA:V) ratio and macroporosity are designed to mimic cancellous bone tissue. The volume-centered cubic and face-centered cubic lattice structures are higher in terms of the SA:V ratio among the designed specimens. Tri Calcium Phosphate (TCP) and Hydroxyapatite (HA) powders, which are calcium phosphates used in healing, growth and adhesion of bone tissues, were used in the specimens. Specimens in the cylindrical form used with four different lattices were successfully produced by 3D (Digital Light Processing) DLP printing. A preliminary evaluation of the lattices was made by searching for the lowest stress and displacement values under compression load with finite element analysis. The lowest von-Mises stress value was 6.37 MPa in the simple cubic lattice structure. The compression test was carried out under quasi-static conditions with equal preloading. The loads at onset damage were compared. The highest fracture average load was in face-centered cubic lattice structures with 10.14 kN. Among the specimens with low standard deviation in the compression test, the simple cubic and gyroid lattice structures' fracture force is higher.
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