S30408碟形封头应变强化特性及极限载荷分析.pdf

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第49卷第4期
机械工程学报
Vo].49No.4
2013年2月
JOURNAL OF MECHANICAL ENGINEERING
Feb
2013
DOIs10.3901/JME.2013.04.089
S30408碟形封头应变强化特性及极限载荷分析
高炳军周军2董俊华1
(1.河北工业大学化工学院天津300130;2.赛鼎工程有限公司太原030032)
摘要:利用磁性测量仪FMP30测量不同塑性应变量下S30408板状拉伸试件形变马氏体体积分数,确定形变马氏体体积分数
与塑性应变的关系。测量某低温液体半挂车罐体内容器碟形封头上各区域的形变马氏体体积分数,并对马氏体体积分数沿经
向的分布规律进行简化,据此推算封头各部位加工历史造成的塑性应变。根据封头各部位的塑性应变确定考虑加工历史时各
部位材料的应力应变曲线,并通过非线性有限元计算确定结构的极限承载能力。与不考虑加工历史仅考虑真应力应变关系以
及不考虑材料强化仅按弹性理想塑性材料计算的结果相比,得到以下结论:对于S30408碟形封头,考虑材料应变强化特征
计算得到的垮塌载荷与极限载荷均明显高于按弹性理想塑性模型计算的结果。加工历史造成的应变强化对结构的垮塌载荷影
响不大,但对按双切线法确定的极限载荷影响较大,可较明显地提高结构的极限载荷。
关键词:应变强化极限载荷碟形封头奥氏体不锈钢
中阳分类号:TH49TG142TH123
Strain-hardening Characteristic and Limit Load Analysis of $30408
Torispherical Head
GAO Bingjun ZHOU Jun""DONG Junhua
(1. School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130
2. SEDIN Engineering Co, Ltd, Taiyuan 030032
Abstract: With the aid of the manetic measuring instrument FMP30, the deformation induced martensite contents(DIMC)of
$30408 plate tensile specimen under different plastic deformation are measured to determine the relationship between the DIMC and
the plastic strain. The DIMC of the dished head is measured for the inner vessel of a cryogenic liquid semi-trailer. The DIMC
distribution along meridional direction is simplified to corelate with plastic strains in different region of the head due to process
history. According to the by one plastic strain, the stress-strain curve for every region of the head is determined for the ultimate
bearing capacity analysis of the structure by nonlinear finite element method. Compared with the results obtained by the two other
inelastic modes(considering the strain strengthening characteristics based on the true stress-strain relationship without bygone plasti
strain in consideration Elastic ee plastic() mode without strain strengthening in consideration ), it is found that, for th
dished head made of $30408, the collapse load and the limit load with the strain strengthening characteristics in consideration are
greater than that with the EPP model. The strain strengthening characteristics based on process history has little effect on the collapse
load, but great effect on the limit load by bi angent method. It can significantly improve the limit load of the structure
Key words: Strain hardening Limit load Torispherical head Austenitic stainless steel
锈钢制造。然而,按照国内现行的设计标准,往往
0前言
不能充分利用奥氏体不锈钢的塑性承载能力,设计
的内容器壁厚偏大。目前国内压力容器设计的标准
采用先进的设计方法对低温液体运输设备进为GB150-2011?与JB4732-19952。GB150-201
行轻量化设计至关重要,这种设备由内容器和外壳对筒体与凸形封头的设计均基于弹性失效设计准
组成,并靠支撑管相互连接,内容器与外壳之间填则,将最大应力限定在弹性范围内,只利用了材料
充真空保温材料,其内容器采用耐低温的奥氏体不的弹性承载能力。JB4732-1995是一种较为先进的
分析设计方法,可采用应力分类法或直接法即极限
20120718收到初稿,20121205收到修改稿