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用BHB型胀形试验机及SLJC-01型板料双向拉伸试验数据的检测与处理系统对深冲薄板进行了胀形试验的动态测量,快速地获得了能评价板料成形性能的双向等拉应力—应变曲线和胀形高度曲线。由多试件法测得的详尽的数据中,可获得表征板料成形极限特性的胀形失稳应变ε_(Zj)的准确值。这在国内外有关文献中未见报导。 符号 σ 顶点周向应力 εt 厚向应变 P 压力 Pmax最大压力 to 原始厚度 t 厚度 n 拱顶高度 H 胀形高度 LBH 极限胀形高度 R 拱顶曲率半径 a,do 标距a=20mm,do=20mm θ 园心角 △d 拱顶弦长增量 e 自然对数之底 ε_(Zj) 胀形失稳应变 K 应变刚系数 n 应变刚指数 SC 直接相关系数
The BHB bulging test machine and SLJC-01 sheet biaxial tensile test data testing and processing system for deep drawing thin plate was bulging test of dynamic measurement, rapid access to the sheet forming performance can be evaluated bidirectional and so on Tensile stress - strain curve and bulge height curve. From the detailed data measured by the multi-specimen method, the exact values of the bulging instability strain ε_ (Zj), which characterizes the ultimate forming behavior of the sheet metal, can be obtained. This has not been reported in the literature at home and abroad. Symbol σ apex circumferential stress εt thickness strain P pressure Pmax maximum pressure to original thickness t thickness n dome height H bulging height LBH limit bulging height R dome radius of curvature a, do gauge a = 20mm, do = 20mm θ central angle of the garden △ d vault chord increment e natural logarithm of the bottom ε_ (Zj) bulging instability strain K strain just coefficient n strain just index SC direct correlation coefficient