棘轮-蠕变交互作用下汽轮机汽缸紧固螺栓失效研究

华电技术 ›› 2013, Vol. 35 ›› Issue (11): 10-12.

棘轮-蠕变交互作用下汽轮机汽缸紧固螺栓失效研究

(华电重工股份有限公司，北京〓100031)

出版日期:2013-11-25 发布日期:2013-12-30

Study on failure of fastening bolts of steam turbine under interaction of ratchettingcreep

(Huadian Heavy Industries Corporation Limited, Beijing 100031, China)

Online:2013-11-25 Published:2013-12-30

摘要/Abstract

摘要： 摘要：机组负荷变动和调峰过程中，汽缸的紧固螺栓在非零平均应力的交变载荷作用下会产生棘轮-蠕变行为，因此，对螺栓在棘轮-蠕变过程中损伤的发展进行研究具有重要意义。对镍基合金Nimonic 80A材料进行了550℃下单轴棘轮-蠕变试验，并在有限元软件Ansys中嵌入基于AbdelKarimOhno运动硬化准则的用户自定义程序，模拟了螺栓的棘轮-蠕变过程。模拟得到的宏观变形量与试验结果一致，在棘轮-蠕变交互作用下，螺栓螺杆处的损伤发展速度大于应力集中的螺纹处，并在此发生断裂。

关键词: 关键词：〖HTSS〗黏塑性, 紧固螺栓, 棘轮-蠕变, Ansys, 断裂

Abstract: Abstract:When the unit load is changing or the unit operates in peak shaving process, under the action of alternately changing load with nonzero average stress, the ratchetingcreep behaviour of the fastening bolts of the turbine cylinder may occur. Therefore, to research the damage development of the bolts during ratchetingcreep process is of important significance. The uniaxial ratchetingcreep rupture experiment was carried out for the nickel base alloy material Nimonic 80A at 550℃. The user selfdefined program, which is based on AbdelKarimOhno kinematic hardening criterion, was embedded into the finite element software Ansys, and the ratchetingcreep process of the bolt was simulated. The macroscopical deformation obtained by simulation was identical with experiment result. Under the ratchettingcreep interaction, the damage development speed of the screw rod of the bolt is greater than that of the thread of the bolt, which is the region of stress concentration, and the rupture may occur there.

Key words: Key words:viscoplasticity, fastening bolt, ratchettingcreep, Ansys, rupture

张淼，袁新勇. 棘轮-蠕变交互作用下汽轮机汽缸紧固螺栓失效研究[J]. 华电技术, 2013, 35(11): 10-12.

ZHANG Miao, YUAN Xinyong. Study on failure of fastening bolts of steam turbine under interaction of ratchettingcreep[J]. Huadian Technology, 2013, 35(11): 10-12.

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