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254 Victor Cotoros and Eugen Merticaru e) the malleolar screw produces, during traction loading, a very big stress in bone tissue which is exceeding the breaking stress of the tissue, this situation leading to fractured fragments displacement and disparagement of osteosynthesis; this technique may be used when the ankle is immobilized or the load is very small; f) simulation and finite element analysis provide the possibility to determine the limit values of the forces acting on the osteosynthesis assembly, so that the surgeon to make the recommendation regarding the gait of the patient after the operation (for example, the gait with or without support). REFERENCES Bozday T., Burjan T., Bagdi C., Floris I., Vendegh Z., Varadi K., Evaluation of Stabilization Methods of Pelvic Ring Injuries by Finite Element Modeling. Eklem Hastalik Cerrahisi, 19, 127-132 (2008). Budescu E., Iacob I., Bazele biomecanicii în sport. Ed. Universităţii “Al. I. Cuza” Iaşi, 2005. Papilian V., Anatomia omului. Vol. 1, Aparatul locomotor. Ed. Didactică şi Pedagogică, Bucureşti, 1982. Poteraşu V.F., Popescu D., Curs de mecanică teoretică. Vol. 1 şi 2, Univ. Tehnică “Gheorghe Asachi” Iaşi, 1995. FRACTURA MALEOLEI TIBIALE: MODEL VIRTUAL ŞI ANALIZA CU METODA ELEMENTELOR FINITE (Rezumat) Lucrarea prezintă modele virtuale ale fracturii maleolei tibiale şi analiza stării de tensiuni pentru trei proceduri ortopedice chirurgicale. Trei ansamble de osteosinteză sunt modelate CAD şi modelele sunt supuse analizei cu elemente finite (FEA). Starea de tensiuni pentru fiecare ansamblu de osteosinteză este comparată cu fiecare din celelalte, rezultând cea mai potrivită procedură chirurgicală.
BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi“ din Iaşi, Tomul LVIII (LXII), Fasc. 4, 2012 Secţia CONSTRUCŢII DE MAŞINI LABORATORY STAND FOR TRAFFIC IMPACT STUDY OF AGRICULTURE AND TECHNOLOGY WORKS ON PHYSICAL PROPERTIES OF SOIL BY IOAN ŢENU ∗ , RADU ROŞCA, PETRU CÂRLESCU and VIRGIL VLAHIDIS University of Agricultural Sciences and Veterinary Medicine of Iasi, Department of Pedotechnica Received: September 30, 2012 Accepted for publication: December 10, 2012 Abstract. The physical degradation of soil due to the interaction with the active parts of the agricultural units and with the wheels of the agricultural units consists mainly in the deterioration of its structure and also in its compaction. In order to quantify these aspects, experimental studies should be developed to establish the values of the active parts and wheels’ working parameters leading to soil degradation. A laboratory test rig with soil bin was designed and built in order to perform studies regarding the interaction of agricultural machineries active parts and wheels with the ground. The studies carried out on the rig allow the determination of the working parameters for the active parts and the wheels (forces of resistance, slip etc), and their impact on the physical and mechanical properties of soil. Key words: active parts, wheel, soil channel. 1. Introduction The interaction of the active parts and wheels of the agricultural equipments with the ground determines its physical degradation, in particular by compaction, but also through the deterioration of its structure (Căproiu et al., 1982; Jităreanu et al., 2007; Ţenu et al., 2010). Experimental studies are necessary to quantify these aspects, in order to establish the values of the active ∗ Corresponding author: e-mail: itenu@uaiasi.ro
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