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钢筘损坏机理探讨 被引量:1
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作者 林吉曙 《成都纺织高等专科学校学报》 CAS 1999年第3期25-27,29,共4页
研究了四连杆织机用钢筘的损坏机理,并在此基础上简要提出了钢筘使用寿命的一些方法。文中指出,钢筘的失效是振动磨损、磨粒磨损、疲劳破坏和冲击损坏综合作用的结果,其如十击损坏的危害最大。提高钢筘使用寿命的途径可以从设计、制... 研究了四连杆织机用钢筘的损坏机理,并在此基础上简要提出了钢筘使用寿命的一些方法。文中指出,钢筘的失效是振动磨损、磨粒磨损、疲劳破坏和冲击损坏综合作用的结果,其如十击损坏的危害最大。提高钢筘使用寿命的途径可以从设计、制造和使用等方面着手,主要是提高筘片以强度为主的强韧性和表面膜的质量。 展开更多
关键词 钢筘 损环机理 寿命 四连杆织机
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Effects of earthquake on damage evolution and failure mechanism of key rock pillars in underground engineering 被引量:2
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作者 WANG Hai-quan ZHOU Zi-long +1 位作者 LI Jun-ping ZHAO Yuan 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第9期3125-3139,共15页
Rock pillar is the key supporting component in underground engineering.During an earthquake,the key rock pillar must bear both the seismic load and the load transferred from other damaged pillars.This paper attempts t... Rock pillar is the key supporting component in underground engineering.During an earthquake,the key rock pillar must bear both the seismic load and the load transferred from other damaged pillars.This paper attempts to reveal the influence of the mainshock on damage evolution and failure characteristic of the key rock pillar during aftershocks by cyclic loading test of marble.Four levels of pre-damage stress(i.e.,10,30,50 and 70 MPa)in the first cycle were used to simulate the mainshock damage,and then cyclic stress with the same amplitude(namely 10 MPa)was conducted in the subsequent cycles to simulate the aftershock until rock failure.The results indicate that the presence of pre-damage has an obvious weakening effect on the bearing capacity and deformation resistance of rock materials during the aftershock process.Besides,the increase of pre-damage significantly changes the final failure pattern of the key rock pillar,and leads to an increase in the proportion of small-scale rock fragments.This study may contribute to understanding the seismic capacity of the unreinforced rock pillar during mainshock-aftershock seismic sequences and to optimizing the design of the key rock pillar in underground engineering. 展开更多
关键词 mainshock damage damage evolution failure mechanism damaged rock cyclic loading
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