Fracture Mechanics
M. Shariati; A. M. Majd Sabeti; H. Gharooni
Abstract
Existence of cracks in industrial structures is one of the important causes of their failure, especially when they are subjected to important axial compressive forces that might lead to buckling. Therefore, it must be considered in stress analysis and designing and loading of such structures. In this ...
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Existence of cracks in industrial structures is one of the important causes of their failure, especially when they are subjected to important axial compressive forces that might lead to buckling. Therefore, it must be considered in stress analysis and designing and loading of such structures. In this paper, the buckling and post-buckling behaviors of stainless-steel cracked plates under axial compression load were investigated both experimentally and numerically and effects of the geometrical and mechanical parameters, such as crack length, crack angle, crack position, plate imperfection, load band, and plate thickness on the critical buckling load were studied. In the experimental study, mechanical properties and plastic behavior of stainless steel plates were determined for the subsequent numerical study. Numerical modeling was carried out by ABAQUS finite element software. Numerical predictions were compared with the experimental results and the reliability of the numerical solution was proven. Results demonstrated the considerable effects of the mentioned parameters on the critical buckling load of plate.
Vibration
M. Shariati; H. Hatami; M. Damghani Nouri
Abstract
In this research, softening and ratcheting behaviors of Ck20 alloy steel cylindrical shells were studied under displacement-control and force-control cyclic axial loading and the behavior of hysteresis curves of specimens was also investigated. Experimental tests were performed by a servo-hydraulic INSTRON ...
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In this research, softening and ratcheting behaviors of Ck20 alloy steel cylindrical shells were studied under displacement-control and force-control cyclic axial loading and the behavior of hysteresis curves of specimens was also investigated. Experimental tests were performed by a servo-hydraulic INSTRON 8802 machine. The mechanical properties of specimens were determined according to ASTM E8 standard. Under force-control loading with non-zero mean force, ratcheting behavior occurred on cylindrical shell and plastic strain accumulation continued up to the collapse point of cylindrical shell. The rate of ratcheting strain became higher using the higher force amplitude. Softening behavior was observed under displacement control loading and, due to the occurred buckling in compression zone, this behavior became more extreme. The behavior of hysteresis curves of this alloy was not symmetrical under tensile and compressive loads. Moreover, the influence of loading history was studied on the behavior of hysteresis curves of the specimens under various types of loadings.
