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.
Highlights
The qualitative analysis showed that the starting location of the fringe orders and the highest concentration point was the first threads of the lead, next to the screw head region
The shear stresses in the 15 points of all photoelastic models were calculated
In the qualitative analysis it was observed that the site of origin of the first orders of the fringe and the most critical region was the first threads of the lead, near the head of the screw
Summary
The pullout force, when applied on the screw, produces internal tensions.[10] the photoelasticity has been used in scientific studies to determine the stress distribution in structural systems using qualitative and quantitative analysis by optical elements.[11] The photoelastic analysis allows observing the stress distribution throughout the whole structure, allowing a general perception about the behavior of tensions.[12] This technique shows the location of the tensions within an experimental model through fringes of different colors. The aim of this study was to determine, analyze and compare the internal tensions of photoelastic models under the influence of 5.2 and 6.2 mm outer diameter USS II type screws, when subjected to pullout efforts using flat transmission photoelasticity.
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