本文選題：薄壁球殼 + 靜態(tài)��； 參考：《寧波大學(xué)》2011年碩士論文

【摘要】：薄壁球殼作為一種基本結(jié)構(gòu)元件,廣泛應(yīng)用于各種運載工具和壓力容器,如航天器和深水工程的壓力容器等,因此研究薄壁球殼的屈曲具有重要意義。對薄球殼在局部沖擊載荷作用下的研究工作將具有重要的理論和應(yīng)用價值。隨著大家對結(jié)構(gòu)安全的關(guān)注,對薄壁球殼力學(xué)特性的研究也越來越多。 本文針對不銹鋼的薄壁球殼進行了靜態(tài)和動態(tài)的壓縮實驗。通過靜態(tài)的薄壁球殼壓縮實驗得到的數(shù)據(jù)進行分析,結(jié)果表明:薄壁球殼在壓縮翻轉(zhuǎn)失穩(wěn)時的臨界位移δc與薄壁球殼厚度t的比值δc/t和薄壁球殼半徑R與厚度t的比值徑厚比R/t相關(guān),隨著薄壁球殼特征尺寸徑厚比R/t的增大,臨界翻轉(zhuǎn)位移δc/t增大。薄壁球殼變形力響應(yīng)曲線隨著徑厚比R/t的增大而減小。對兩種計算曲線和實驗曲線的比較得出:通過對計算曲線和實驗曲線比較分析得出彈性計算模型在壓縮的初始階段與實驗曲線符合的比較好;剛塑性計算曲線在球殼壓平的階段與實驗的曲線差別比較大,隨著壓縮位移的增大,剛塑性計算曲線和實驗曲線吻合的比較好。動態(tài)壓縮實驗是在霍普金森桿上進行,動態(tài)數(shù)據(jù)主要包括動態(tài)的位移—時間曲線和力—時間曲線,對兩條曲線獲得進行了詳細(xì)的介紹,得到了不同沖擊速度下的力—位移曲線,對得到的曲線與靜態(tài)曲線進行了比較分析,分析表明:在壓縮的初始階段,動態(tài)的壓縮力要小于靜態(tài)的壓縮力。徑厚比R/t相同的薄壁球殼在動態(tài)沖擊壓縮下,半徑、厚度越小,所需要的壓縮力越小。薄壁球殼在沖擊壓縮下更容易形成非對稱屈曲,隨著沖擊速度的增加,薄壁球殼失穩(wěn)形成的多邊形的邊數(shù)有增加的趨勢。對動態(tài)實驗進行了有限元計算,在有限元計算結(jié)果與實驗得出的結(jié)果比較吻合的情況下通過有限元計算得到:薄壁球殼隨著沖擊速度的增加產(chǎn)生非對稱屈曲所需要的壓縮位移和壓縮力不斷增加。
[Abstract]:As a basic structural element, thin-walled spherical shells are widely used in various vehicles and pressure vessels, such as spacecraft and deep-water engineering pressure vessels, so it is of great significance to study the buckling of thin-walled spherical shells.The research of thin spherical shell under local impact load will have important theoretical and practical value.With the attention to structural safety, there are more and more researches on the mechanical properties of thin-walled spherical shells.In this paper, static and dynamic compression experiments are carried out for the thin wall spherical shell of stainless steel.The data obtained from static thin-walled spherical shell compression experiments are analyzed.The critical inversion displacement 未 c / t increases.The deformation force response curve of thin wall spherical shell decreases with the increase of diameter to thickness ratio R / t.The comparison of two kinds of calculation curves and experimental curves shows that the elastic calculation model is in good agreement with the experimental curve in the initial stage of compression by comparing and analyzing the calculated curve and experimental curve;The curve of rigid-plastic calculation is quite different from that of experiment in the stage of spherical shell flattening. With the increase of compression displacement, the curve of rigid-plastic calculation is in good agreement with the experimental curve.The dynamic compression experiment is carried out on the Hopkinson bar. The dynamic data mainly include the dynamic displacement-time curve and the force-time curve. The two curves are introduced in detail, and the force-displacement curves under different impact velocities are obtained.The comparison between the obtained curves and the static curves shows that the dynamic compression force is smaller than the static compression force in the initial stage of compression.The smaller the radius and thickness of thin-walled spherical shells with the same diameter / thickness ratio under dynamic impact compression, the smaller the compression force is required.It is easy to form asymmetric buckling of thin-walled spherical shells under impact compression. With the increase of impact velocity, the number of edges of the polygons formed by the buckling of thin-walled spherical shells increases.The dynamic experiment is calculated by finite element method.When the results of finite element calculation are in good agreement with the experimental results, it is concluded that the compression displacement and compression force of thin wall spherical shells are increasing with the increase of impact velocity.
【學(xué)位授予單位】：寧波大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH49

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