Sarah Fakher Fakhouri1, Marcos Massao Shimano2, Cleudmar Amaral de Araújo3, Helton Luiz Aparecido Defino1, Antônio Carlos Shimano1. 1. Universidade de São Paulo, Faculdade de Medicina de Ribeirão Preto, Ribeirão Preto, SP, Brazil, Department de Biomechanics, Medicine and Rehabilitation of the Locomotor System, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil. 2. Universidade Federal do Triângulo Mineiro, Departement of Mechanical Engineering, Uberaba, MG, Brazil, Departement of Mechanical Engineering, Universidade Federal do Triângulo Mineiro, Uberaba, MG, Brazil. 3. Universidade Federal de Uberlândia, Faculdade de Engenharia Mecânica, Department of Mechanical Projects, Uberlândia, MG, Brazil, Department of Mechanical Projects, Faculdade de Engenharia Mecânica, Universidade Federal de Uberlândia, Uberlândia, MG, Brazil.
Abstract
OBJECTIVE: To compare, using photoelasticity, internal stress produced by USS II type screw with 5.2 and 6.2 mm external diameters, when submitted to three different pullout strengths. METHODS: Two photoelastic models were especially made. The simulation was performed using loads of 1.8, 2.4 e 3.3 kgf.The fringe orders were evaluated around the screws. In all the models analyzed the shear stress were calculated. RESULTS: Independently of the applied load, the smaller screw showed higher values of shear stress. CONCLUSION: According to the analysis performed, we observed that the place of highest stress was in the first thread of the lead, close to the head of the screws. Experimental study.
OBJECTIVE: To compare, using photoelasticity, internal stress produced by USS II type screw with 5.2 and 6.2 mm external diameters, when submitted to three different pullout strengths. METHODS: Two photoelastic models were especially made. The simulation was performed using loads of 1.8, 2.4 e 3.3 kgf.The fringe orders were evaluated around the screws. In all the models analyzed the shear stress were calculated. RESULTS: Independently of the applied load, the smaller screw showed higher values of shear stress. CONCLUSION: According to the analysis performed, we observed that the place of highest stress was in the first thread of the lead, close to the head of the screws. Experimental study.