Machine vision is used to track nodes on the perimeter of a geometric shape associated with a body undergoing cyclic loading, the geometric shape defining a target. The movement of the nodes is related to calculate strain through principles of Finite Element Analysis. The calculated strain is used to determine fatigue damage in the body based on an equation and data obtained using strain-controlled test methods. A finite element analysis fatigue gage includes (1) a sensor to capture the total image of the target and to output data representing the total image, (2) a computer program for (a) isolating the perimeter of the target using edging algorithms and the data, (b) tracking the movement of perimeter nodes of the target as the body undergoes deformation and recording the displacement, and (c) manipulating the data on movement of the nodes using (i) nonlinear stress analysis, (ii) finite element analysis, and (iii) material properties and characteristics and an equation based on strain-controlled test methods, and (3) a data display.
TEHRAN (AFP) President Mahmoud Ahmadinejad has sought to justify his confidence the United States will not attack Iran, saying the proof comes from his mathematical skills as an engineer and faith in God, the press reported on Monday. Ahmadinejad told academics in a speech that elements inside Iran were pressing for compromise in the nuclear standoff with the West over fears the United States could launch a military strike.
"In some discussions I told them 'I am an engineer and I am examining the issue. They do not dare wage war against us and I base this on a double proof'," he said in the speech on Sunday, reported by the reformist Etemad Melli and Kargozaran newspapers.
"I tell them: 'I am an engineer and I am a master in calculation and tabulation.
"I draw up tables. For hours, I write out different hypotheses. I reject, I reason. I reason with planning and I make a conclusion. They cannot make problems for Iran.'"