Though the Flatteing procedure makes the yield strength reduced due to Bauschinger Effect,but the springback stress effect is much more pronounced.Therefore,this kind of characterization is unsafe.

• 虽然压平过程的包申格效应使试样的屈服强度降低，但弹复应力使管体屈服强度降低更严重，因而这种表征是偏于不安全的。