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Abstract：
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FEA was used in the bending process. The zone was picked out where the crack and wrinkle happened,and at the same time,the thickness in bending area was analysed. On this basis,the technical experiments were carried out and the thickness distribution was made clearly. The experiment results coincide with the FEA greatly. Both of them show that the thickness of outer tube descends and the thickness of inner tube goes up. Furthermore,the greatest thinning and thicking both are in the middle of bends. During the bending process,the average εt will decrease with the increasing of relative bending radii R/t0. The extra thinning and even the cracking condition will occur if the value of R/t0 is too small.
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Reference：
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