Aim To investigate bucking behavior of a simply supported sandwich curved plate subjected to uniformly distributed axial compression, whose surface layers may have unequal thickness and different materials.

Analysis of defection on bend forging of large marine crank;

Too low content of pearlite after heat treatment was the main re ason causing the K-9cranks to be rejected.

Crankshaft is a very important component of large marine engine and its key part is crank.

Inclusions in steel were sampled from the EAF-LF(VD)-VC production process of marine crank steel S34MnV,including the electric period,LF-VD refining period,casting period,and forging ingots in a heavy machinery factory in north China to solve the difficulty of being rejected by ultrasonic flaw detection crank shaft.

The experimental samples were the marine crank steel S34MnV produced by the EAF-LF(VD)-VC production process,including the electric period,LF-VD refining period,casting period,and forging ingots from a heavy machinery factory in north China to solve the difficulty of being rejected by ultrasonic flaw detection for crank shaft.