【摘要】：因結(jié)構(gòu)原因,部分外壓薄壁圓筒的加強圈尺寸受限,雖能在一定程度上對外壓圓筒起到加強作用,但加強效果與大加強圈相比會有明顯的差異。對一系列帶加強圈的外壓薄壁圓筒進行了特征值屈曲分析,表明加強圈尺寸不同時外壓圓筒會有兩種不同的失穩(wěn)形態(tài)。加強圈尺寸足夠大時,筒體失穩(wěn)而加強圈不失穩(wěn),失穩(wěn)波形數(shù)大于3,結(jié)構(gòu)的臨界壓力與加強圈尺寸無關(guān),應(yīng)稱之為強加強結(jié)構(gòu),加強圈為大加強圈;而加強圈尺寸較小時,加強圈與筒體同時失穩(wěn),失穩(wěn)波形數(shù)隨加強圈尺寸的增大會由3變?yōu)?,結(jié)構(gòu)的臨界壓力與加強圈尺寸有關(guān),加強圈尺寸越大,臨界壓力越高,應(yīng)稱之為弱加強結(jié)構(gòu),加強圈為小加強圈。通過參數(shù)化計算,確定了外壓薄壁圓筒強、弱加強結(jié)構(gòu)的分界線。對于弱加強結(jié)構(gòu)確定了三波失穩(wěn)與兩波失穩(wěn)的分界線,給出了弱加強結(jié)構(gòu)三波及兩波失穩(wěn)的臨界壓力計算經(jīng)驗公式。與HG/T20582-2011近似計算方法給出的許用外壓力相比,方法給出的結(jié)果約大100%~450%,更有利于實現(xiàn)結(jié)構(gòu)的輕量化設(shè)計。
[Abstract]:Due to structural reasons, the size of the strengthening ring of part of the external pressure thin-wall cylinder is limited, although the external pressure cylinder can play a strengthening role to a certain extent, but the strengthening effect will be obviously different from that of the large strengthening ring. The eigenvalue buckling analysis of a series of outer pressure thin-wall cylinders with reinforcement rings is carried out. It is shown that there will be two different instability forms of external pressure cylinders when the size of strengthening rings is different. When the size of the strengthening ring is large enough, the cylinder is unstable and the strengthening ring is not unstable, and the number of instability waveforms is more than 3. The critical pressure of the structure is independent of the size of the strengthening ring, so it should be called strong strengthening structure, and the strengthening ring is a large strengthening ring. When the size of the strengthening ring is small, the strengthening ring and the cylinder are unstable at the same time, and the number of instability waveforms changes from 3 to 2 with the increase of the size of the strengthening ring. The critical pressure of the structure is related to the size of the strengthening ring. The larger the size of the strengthening ring, the higher the critical pressure, which should be called weak strengthening structure, and the strengthening ring is a small strengthening ring. Through parametric calculation, the dividing line of strong and weakly strengthened structure with thin wall cylinder under external pressure is determined. For the weakly strengthened structure, the dividing line between the three-wave instability and the two-wave instability is determined, and the empirical formula for calculating the critical pressure of the three-wave instability and the two-wave instability of the weakly strengthened structure is given. Compared with the allowable external pressure given by the HG/T20582-2011 approximate calculation method, the result given by the method is about 100% 鈮，

本文編號：2524824