4 research outputs found
A new Track of Fatigue crack growth in Aluminum Alloy (2219) under Cyclic Stresses
No full textA study of new Track of Fatigue crack growth in aluminum alloy (2219) under cyclic stresses has been made. It was found out that this crack grow and propagate in three phases, the first phase though the grain size (micro-structure short cracks(MSC)), second phase cross the boundary of the grain size to about 1mm in length (physically short cracks (PSC)) and the third phase up to the final fracture (Length cracks(LC)). In addition, two programs were designed on MATLAB to perform the compute calculations to collect the results. The first program to calculate the practical constants and the second to make the calculations required to complete the work schedules. The stress and the parameters effecting the growth of these cracks in each phase were studied. A model consisting of three formulas was established from the experimental results. Each formula describes the behavior of the cracks in the particular phase. The comparison showed that the proposed model is safer than the experimental results for the designed parts of aircraft
ADA Solve the Cubic Equation in a New Method with Engineering Application Solve the Cubic Equation in A New Method with Engineering Application
No full textStudy of Crack Propagation in Flat Surfaces Through Experimental and Numerical Work
No full textThis paper aims to numerically model the crack growth path in linear elastic materials under cyclic loading. The effect of crack initiation, propagation, and fatigue life under constant amplitude tensile loading specimens has been studied. The model is preprocessed, the level set updated, the stress intensity factor is calculated, and the crack propagation analysis is performed using Abaqus built-in and external MATLAB functions. Linear elastic fracture mechanics (LEFM) has been adopted for the crack analysis process. The aspects of the implementation and proposed treatments for enriched element processing, framework preparation, stress intensity factor evaluation, and numerical analyses have been described in detail. The proposed method's accuracy and robustness are examined through numerical simulated examples of stationary and crack growth problems using 2D and 3D models. Paris's law has been used to evaluate the fatigue, which involves carefully evaluating stress intensity factors. Different Extended Finite Element Method (XFEM) methodologies and frameworks have been developed to simulate the initiation and propagation of 2 and 3-dimensional micro-cracks through versatile physical models of structures. The results have excellent agreements with the literature's analytical, numerical, and experimental analyses
