Acrylonitrile–butadiene–styrene (ABS) is a popular engineering thermoplastic and it is the most common material used in fused deposition modeling (FDM) technology. This technology is nowadays used for the production of prototypes and functional parts as well. It is therefore critical to know the mechanical properties of these parts, which, is as expected different from their nominal values.
In this work the tensile strength of parts build with the FDM process is measured. ABS and ABS plus parts were built with different building parameters and were tested according to the ASTM D638-02a standard on a Schenk Trebel Co. tensile test machine. It was found that the building direction does not significantly influence the tensile strength of the parts, although the parts were anisotropic, as expected. Parts build with larger layer thickness showed lower tensile strength. The average deviation between nominal and experimental tensile strength was about 15% for the ABS and about 42% for the ABS plus material. The ABS plus showed on average 9% higher strength than ABS.
This paper describes the results of the mathematical and computer modeling efforts of heat generation in the contact area of a moving object on an infinite plane with friction. The distribution of contact pressure with a linear approximation was obtained. The heat equations for a nonlinear volume heat source were solved. It is shown, that at the initial stages of the linear friction welding (LFW) process temperature distribution is non-elliptical with two hot spots appearing near the edges of the moving specimen. Then as the process progresses these two spots expand and move to the center of the specimen. The results of the mathematical and the numerical modeling in ANSYS APDL software are in good quantitative agreement.
A 3D computer model of the preliminary and the transition phases of LFW using ANSYS was developed. Based on the adhesion phenomena theory, we introduce a simple method to evaluate the areas of joint formation. Results of this evaluation are in good agreement with experiments. Custom software for the 3D-simulation of the process of joint formation and material movement into the flash was built, which used the results of the FEM model.
Machining can have a significant effect on the properties of machined parts of different equipment during their production. This paper is on the effect of vertical angle and cutting speed on temperature and stress. Using computer modeling values of these parameters were identified. Using the least squares method and a factorial computer experiment the dependence of peak values of temperature and stress is shown.
The results of numerical simulation of hollow blade blow-up of a superplastic material and its subsequent cooling during the manufacturing process are presented. For each stage of the process, the distribution of internal strains and stresses are calculated to assess the effect of process parameters on the final result.
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