By plasticity increment theory, the stress strain numerical calculate methods of bellows bulge forming, solvers theory calculating problems of bellows bulge forming technology are put forward.
Integrate effect was estimated by measured layer gap, stress and strain through hydraulic bulge and pressure increase test.
通过在液压胀合处理及加压试验中实测的层间间隙、应力和应变来评估其贴合效果。
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The former is similar to bulge, but the deforming mode of the latter is rolling in which the stress is tensile in generatrix direction and the wall thickness are mainly reduced in this zone.