Structural mechanical analysis of typical sections of vehicle launched underwater under impact loading
For the vertical ice-breaking process of vehicle launched underwater,there are great uncer-tainties in the loading characteristics of the typical sections of the vehicle.Based on the ALE fluid-structure coupling algorithm,the mechanical response of the sections under the two parameters of shell thickness and yield strength of the vehicle was solved and analyzed by using the LS-DYNA soft-ware.The results show that:the stress on the Ⅰ-Ⅱ level part of the vehicle launched underwater is greater than that on the Ⅱ-Ⅲ level,which is related to the inertia force of the connected part at the rear end of the part;the t/D(the ratio of the shell thickness to the outer diameter of the vehicle launched underwater)ofthe part is increased from 0.009 to 0.012,and the stress on the Ⅱ-Ⅲ level part is decreased from 362.9 to 323.4 MPa,and that on the Ⅰ-Ⅱ level part is decreased from 326.4 to 222.3 MPa,and the decreasing trend of stress in Ⅱ-Ⅲ section is more obvious than that in Ⅰ-Ⅱ sec-tion;the structural strength of two sections using titanium alloy material meets the design require-ments,and the stress in Ⅰ-Ⅱ and Ⅱ-Ⅲ sections using carbon fiber material exceeds the permissible stress by 7.4%and 21.2%,respectively;and the stress in Ⅰ-Ⅱ section using magnesium alloy mate-rial exceeds the yield limit by 29.7%,Ⅱ-Ⅲ level exceeded the yield limit by 3.2%.
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维普
