| Cylindrical shell is widely used in aviation and aerospace engineering. Thetemperatures of irradiation area rise up quickly when the cylindrical shell is irradiatedby power laser. As the temperature is elevated, softening, melting, gasification andother physical process occurs which have great effect on temperature distribution andaxial bearing capacity. The paper has a study on the smooth thin-walled andgrid-stiffened cylindrical shell subjected to axial compression and local laserirradiation based on experiments and numerical simulation. The main contents are asfollows:(1) The failure of smooth thin-walled cylindrical shell subjected to axialcompression and local laser irradiation was studied using experiments and numericalsimulation. The experimental process was simulated using numerical methods, andthe displacement-load curve law was analyzed. The numerical simulations resultswere compared with the temperature variation and failure time which obtained fromexperiments. The comparison results verify the correctness of the simulation method.(2) Numerical simulation method was used to study the temperature distribution,stress distribution and damage law of the shell. The empirical failure expressions havebeen acquired through studying the relations between failure time and axialcompression, spot radius, laser power density, or laser energy.(3) Numerical simulation method was applied to deduce the temperaturedistribution of the grid-stiffened cylindrical shells subjected to local laser irradiation.Comparing to smooth thin-wall cylindrical shell, the effect of the size of ribs on thetemperature distribution was analyzed. When the position of spot center changed, thevariation of maximum temperature is analyzed. Through studying the failure time ofgrid-stiffened cylindrical shell, the effect and empirical failure expressions of axialcompression, spot radius, and laser power density have been acquired which providereference to anti-laser design of the structure. |
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