外压薄壁圆筒弱加强结构及其临界压力的计算
发布时间：2019-08-09 13:59
【摘要】：因结构原因,部分外压薄壁圆筒的加强圈尺寸受限,虽能在一定程度上对外压圆筒起到加强作用,但加强效果与大加强圈相比会有明显的差异。对一系列带加强圈的外压薄壁圆筒进行了特征值屈曲分析,表明加强圈尺寸不同时外压圆筒会有两种不同的失稳形态。加强圈尺寸足够大时,筒体失稳而加强圈不失稳,失稳波形数大于3,结构的临界压力与加强圈尺寸无关,应称之为强加强结构,加强圈为大加强圈;而加强圈尺寸较小时,加强圈与筒体同时失稳,失稳波形数随加强圈尺寸的增大会由3变为2,结构的临界压力与加强圈尺寸有关,加强圈尺寸越大,临界压力越高,应称之为弱加强结构,加强圈为小加强圈。通过参数化计算,确定了外压薄壁圆筒强、弱加强结构的分界线。对于弱加强结构确定了三波失稳与两波失稳的分界线,给出了弱加强结构三波及两波失稳的临界压力计算经验公式。与HG/T20582-2011近似计算方法给出的许用外压力相比,方法给出的结果约大100%~450%,更有利于实现结构的轻量化设计。
[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，
本文编号：2524824
[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，
本文编号：2524824
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