To investigate the low temperature fatigue crack propagation behavior of offshore structural steel A131 under random ice loading, three ice failure modes that are commonly present in the Bohai Gulf are simulated accor...To investigate the low temperature fatigue crack propagation behavior of offshore structural steel A131 under random ice loading, three ice failure modes that are commonly present in the Bohai Gulf are simulated according to the vibration stress responses induced by real ice loading. The test data are processed by a universal software FCPUSL developed on the basis of the theory of fatigue crack propagation and statistics. The fundamental parameter controlling the fatigue crack propagation induced by random ice loading is determined to be the amplitude root mean square stress intensity factor K-arm. The test results are presented on the crack propagation diagram where the crack growth rate da/dN is described as the function of K-arm. It is evident that the ice failure modes have great influence on the fatigue crack propagation behavior of the steel in ice-induced vibration. However, some of the experimental phenomena and test results are hard to be physically explained at present. The work in this paper is an initial attempt to investigate the cause of collapse of offshore structures due to ice loading.展开更多
SINCE high-pressure metapelitic rocks have been discovered in the Beiketan area of eastern Al-tun Mountains,a set of eclogite has been recognized in south of Jianggesayi,western Altun.The eclogite,associated with quar...SINCE high-pressure metapelitic rocks have been discovered in the Beiketan area of eastern Al-tun Mountains,a set of eclogite has been recognized in south of Jianggesayi,western Altun.The eclogite,associated with quartz-garnet-clinopyroxenite and metamorphosed retrogradelyto garnet-amphibolite partially,is exposed in the Proterozoic meso- to hypometamorphic rocksand can be traced eastward to northwest of Mangya asbestos deposit,for about 200展开更多
文摘To investigate the low temperature fatigue crack propagation behavior of offshore structural steel A131 under random ice loading, three ice failure modes that are commonly present in the Bohai Gulf are simulated according to the vibration stress responses induced by real ice loading. The test data are processed by a universal software FCPUSL developed on the basis of the theory of fatigue crack propagation and statistics. The fundamental parameter controlling the fatigue crack propagation induced by random ice loading is determined to be the amplitude root mean square stress intensity factor K-arm. The test results are presented on the crack propagation diagram where the crack growth rate da/dN is described as the function of K-arm. It is evident that the ice failure modes have great influence on the fatigue crack propagation behavior of the steel in ice-induced vibration. However, some of the experimental phenomena and test results are hard to be physically explained at present. The work in this paper is an initial attempt to investigate the cause of collapse of offshore structures due to ice loading.
文摘SINCE high-pressure metapelitic rocks have been discovered in the Beiketan area of eastern Al-tun Mountains,a set of eclogite has been recognized in south of Jianggesayi,western Altun.The eclogite,associated with quartz-garnet-clinopyroxenite and metamorphosed retrogradelyto garnet-amphibolite partially,is exposed in the Proterozoic meso- to hypometamorphic rocksand can be traced eastward to northwest of Mangya asbestos deposit,for about 200
