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本文应用声发射技术检测了Ａ３钢、２０钢、４５钢、４０６钢板材液压胀形全过程，所得数据表明液压胀形全过程存在两个屈服阶段，两次变形转移。第一阶段的屈服是中心区与凹模入口区的屈服，第二阶段的屈服是中心区与凹模入口区之间的环形区域的屈服，第一次转移是中心区、凹模入口区向环形区转移，第二次转移是环形区向中心区转移。胀形深度一声发射计数率曲线有两个峰值区，两个平静区，第二个平静区预示着材料的破坏。
In this paper, the whole process of hydraulic bulging of A3 steel, 20 steel, 45 steel and 406 steel is tested by acoustic emission technique. The data shows that there are two yielding stages in the whole process of hydraulic bulging, and the two deformations are transferred. The first stage of yielding is the yielding of the central zone and the die entry zone. The yielding of the second stage is the yielding of the annular zone between the central zone and the die entry zone. The first transfer is the central zone, Annular zone transfer, the second transfer is the transfer of the annular zone to the center. Bulging depth emission acoustic emission count rate curve has two peak areas, two calm areas, the second calm area indicates the destruction of the material.