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AutoCAD 2019 is a computer-aided design (CAD) program used for 2D and 3D design purpose. AutoCAD is designed, developed and marketed by Autodesk. It was first released in December 1982 as a desktop app running on a microcomputer with the help of internal graphics controllers.
Autocad 2019 Crack
In this paper, the experimental determination of the stress intensity factor in thick walled cylinders subject to uniform internal pressure and having longitudinal non-penetrating cracks is presented. Photoelastic measurements were used together with the expressions of the stress field near the crack tip for Mode I crack extension and a specific methodology for stress intensity factor determination. Two types of longitudinal cracks - internal and external - were considered. Four plane models were manufactured and analyzed in a plane polariscope at different values of the applied internal pressure. The values of the normalized stress intensity factor were calculated and the results were compared to those reported by other authors. A good accuracy was noticed, showing the reliability of the experimental procedure.
By applying a cyclic eccentrically tensile loading, oscillatory positive, determines at the crack peak that exist in a plate specimen CT type a compound loading of bending with tensile. The aim of the study is to analyze the equivalent stress variation σ, when the working temperature varies, namely: T= 293K (+20C), T= 253K (-20C) and T= 213K (-60C). The specimens are made from a stainless steel 10TiNiCr175 type, and were loaded with the asymmetry coefficient R= 0.1. There are drawn the variation curves of stress versus the crack length variation, σ(a), versus the material durability, σ(N), and respectively versus the stress intensity factor, σ(ΔK), for the three loading temperatures.
In the process of materials fracture, a very important parameter to study is the cracking rate growth da/dN. This paper proposes an analysis of the cracking rate, in a comparative way, by using four mathematical models:1 - polynomial method, by using successive iterations according to the ASTM E647 standard; 2 - model that uses the Paris formula; 3 - Walker formula method; 4 - NASGRO model or Forman - Newman - Konig equation, abbreviated as FNK model. This model is used in the NASA programs studies. For the tests, CT type specimens were made from stainless steel, V2A class, 10TiNiCr175 mark, and loaded to a variable tensile test axial - eccentrically, with the asymmetry coefficients: R= 0.1, 0.3 and 0.5; at the 213K (-60C) temperature. There are analyzed the cracking rates variations according to the above models, especially through FNK method, highlighting the asymmetry factor variation.
In this paper, the authors propose a studying method for the deformation that appears before crack of ductile materials using the Lode parameter determined by the numerical calculation applied on simple models, verified in previous studies. In order to highlight the influence of the Lode parameter, the tests were performed at simple but also at compound tests. The necessity of these studies lies in the fact that the acknowledged models (the use of the integral J, the critical stress intensity factor Kc or the CPCD method) do not fully explain the phenomenon of deformation before breaking the elasto-plastic materials. The tests were imagined under the form of sets. Each set of tests was performed on smooth specimens and on specimens with a notch radius of 0.5, 2, 4 and 10 mm. Also, each set of tests was performed for pure tensile and combined tensile-torque test.
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