發(fā)布時間：2018-09-08 10:14

【摘要】：采用應變強化技術可使奧氏體不銹鋼深冷容器壁厚減薄,實現(xiàn)結構輕量化。目前我國已將該技術用于固定式深冷容器中,但是尚未用于移動式深冷容器,這主要是缺乏相關基礎研究,對該技術用于移動式深冷容器存在耽心。本文以奧氏體不銹鋼應變強化型移動式深冷容器為研究對象,分析強化工藝參數(shù)的確定方法,基于韌性斷裂和疲勞斷裂的失效模式,利用非線性有限元數(shù)值模擬的方法對其進行設計校核,并對內容器支撐區(qū)域的補強結構開展參數(shù)化分析,主要完成的研究工作及結論如下:(1)針對移動式壓力容器的結構特點,內容器應變強化條件下的塑形變形不宜過大。根據(jù)材料真實的力學性能,提出了該類容器應變限制條件ε=min {ε410,5%},進而選取合適的強化應力值Rk=min{410MPa,σ5%},由修正公式計算得到強化壓力值Pk。(2)針對一典型移動式壓力容器開展數(shù)值模擬研究,通過分析不同工況下容器的受力情況,發(fā)現(xiàn)最大Mises等效應力值都出現(xiàn)在固定端支撐區(qū)域的加強圈上,超過奧氏體不銹鋼材料在室溫下的許用應力值,存在一定的安全隱患。(3)基于韌性斷裂和疲勞斷裂失效模式,對該容器進行強度校核。有限元分析結果表明容器在正常的服役過程中不會發(fā)生塑性垮塌、局部失效和疲勞破壞。(4)研究了加強圈的結構形式、布置方式以及筒體局部加厚結構參數(shù)對容器應力的影響規(guī)律。對比加強圈與筒體局部加厚這兩種補強結構形式對容器應力分布的影響,結果表明后者更利于改善容器的受力情況。
[Abstract]:The wall thickness of austenitic stainless steel cryogenic vessel can be thinned by strain strengthening technique and the structure is lightweight. At present, the technology has been used in the stationary cryogenic container, but it has not been used in the mobile cryogenic container. This is mainly due to the lack of related basic research, so there is concern about the application of this technology in the mobile cryogenic container. In this paper, an austenitic stainless steel strain-strengthened mobile cryogenic vessel is studied. The determination of strengthening process parameters is analyzed based on the failure modes of ductile fracture and fatigue fracture. The nonlinear finite element numerical simulation method is used to design and check it, and parameterized analysis is carried out for the reinforced structure of the inner support area. The main research work and conclusions are as follows: (1) according to the structural characteristics of mobile pressure vessels, The plastic deformation should not be too large under the strain strengthening condition. According to the real mechanical properties of the material, the strain limiting condition of this kind of vessel, 蔚 / min {蔚 410mg / 5%}, is put forward, and then the appropriate strengthening stress value Rk=min {410MPa, 蟽 5%} is selected, and the strengthening pressure value Pk. (2) is calculated by the modified formula and the numerical simulation is carried out for a typical mobile pressure vessel. By analyzing the stress of the vessel under different working conditions, it is found that the maximum effect force of Mises appears on the reinforcing ring of the fixed end bracing area, which exceeds the allowable stress value of austenitic stainless steel material at room temperature. (3) based on the failure mode of ductile fracture and fatigue fracture, the strength of the vessel is checked. The results of finite element analysis show that plastic collapse, local failure and fatigue failure will not occur during the normal service of the vessel. (4) the structural form of the strengthened ring is studied. The influence of layout and local thickening structure parameters on vessel stress. By comparing the influence of the two kinds of reinforcing structure forms on the stress distribution of the vessel, the results show that the latter is more favorable to improve the stress situation of the vessel.
【學位授予單位】：華東理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH49

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