Indonesia's navy said an electrical failure may have occurred during the dive, causing the submarine to lose control and become unable to undertake emergency procedures that would have allowed it to resurface. South Korea said it has also offered help. The Indonesian military said Australia, the United States, Germany, France, Russia, India and Turkey have also offered assistance. Rescue ships from Singapore and Malaysia are expected to arrive between Saturday and Monday. In this photo taken from a maritime patrol aircraft, oil slicks are seen Thursday in the area where the search operation for the Nanggala is being conducted in the waters off Bali Island, Indonesia. Neighbouring countries are rushing to join the complex operation.
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Margono said the oil slick may have been caused by a crack in the submarine's tank after it sank. A hydro-oceanographic survey ship equipped with underwater detection capabilities also was on its way to the site around the oil spills. The military said more than 20 navy ships, two submarines and five aircraft were searching the area where the submarine was last detected. He said rescuers found an unidentified object with high magnetism at a depth of 50 to 100 metres and that officials hope it's the submarine. "Hopefully we can rescue them before the oxygen has run out" on Saturday, Indonesia's navy chief of staff, Admiral Yudo Margono, told reporters. Officials reported an oil slick and the smell of diesel fuel near the starting position of its last dive, about 96 kilometres north of the resort island of Bali, though there was no conclusive evidence that they were linked to the submarine. The diesel-powered KRI Nanggala-402 was participating in a training exercise Wednesday when it missed a scheduled reporting call. Authorities said oxygen in the submarine would run out by early Saturday. Research on toughness propagation of surface crack of X60 submarine pressure pipeline.Indonesian navy ships searched Thursday for a submarine that likely sank too deep to retrieve, making survival chances for the 53 people on board slim. Pressure pipeline surface crack stress intensity factor extended finite element method The results show that with different parameters, the maximum stress intensity factor appears at the deepest part of crack non-penetrating cracks propagate firstly from the crack tip along the wall thickness direction, and propagate along the crack length direction after the depth-diameter ratio reaches a certain value. The crack propagation process was dynamically analyzed by extended finite element method, the crack propagation process was simulated, the calculation results of stress intensity factor were analyzed and studied, and the general law of crack propagation was summarized.
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Abstract To study the variation law of stress intensity factor and the propagation process of pipeline surface cracks under different conditions, taking the X60 submarine pressure pipeline as research object, the stress-strain curve of X60 pipeline steel was obtained by universal material testing machine, crack simulation model was established by ABAQUS finite element software and verified by the pipeline mechanics formula, by changing the depth-diameter ratio, size, location of the crack and velocity of sea water, the influence of different parameters on the stress intensity factor of crack was obtained.