The study about deformations of thermoplastic polyurethane membrane (desmopan membrane) is very important for a lot of industry domains (mechanic, transport, agriculture, chemistry, medicine, ...). This paper presents an original work about deformations by Finite Elements Method (FEM) analysis for desmopan membrane. Thermoplastic polyurethane (desmopan), an anisotropic material, is made in a very wide range of models and types. By Digital Image Correlation Method (DICM) we have determined mechanical characteristics [5].These with geometrical characteristics are required as input for FEM. Stresses [2] and deformations output of FEM, are necessary to calculate the fatigue resistance to limited durability to fracture [7]. After, we can study the membrane reliability of the desmopan membranes for diaphragm pumps.
The paper presents an analytical calculus for the bending beams on elastic environment. The elastic environment sends in all points a reaction force proportional to the deformation with the same constant of proportionality in all points. The calculus of the state vectors associated at the origin section and at the end section of the beam is made by Transfer-Matrix Method, putting the conditions on the supports (extremities) of the beam. After, we can calculate all state vectors for all sections of the beam.
Abstract. The paper presents a relatively simple and elegant analytical calculus of critical buckling force for a straight bar, one-end embedded and other end free, with an axial compression force F, using the TransferMatrix Method (TMM). The algorithm is based on the simplifications of the mathematical apparatus offered by Dirac and Heaviside's functions and operators regarding effort density. The results obtained will be used in the study of dental implants. The implant was assimilated as a bar on elastic environment, one-end of bar embedded and other end free, with an axial compression force F at the free end, the bone being assimilated as an elastic environment.
Abstract. The bio-composites materials are very important for a lot of industry and life domains, particularly in the aeronautic industries and medicine, in orthopedics. Titanium and its alloys are most widely used, due to their mechanical properties similar to bone tissue. The sandwich structures are very light, they have a high stiffness in flexion and very good thermal characteristics. For the compressed sandwich structures, risks of buckling are higher than the conventional compressed structures, limited by a critical value of the applied force, then the deformations grow in importance and uncontrolled manner. We try to calculate the critical buckling force by the method presented in [2].
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