摘要
The functional relations between the constant-height bulging m_h value, constant-pressurebulging m_p value and constant-velocity bulging m_v have been established on the basis of them-value definition of superplastic bulging, using equivalent stress, equivalent strain andequivalent strain rate of superplastic bulging as well as the analytical expressions of them-value for free bulging in a few typical loading paths. To non-work hardening, workhardening and work softening materials, the relationships between m_h, m_p and m_v have beenquantitatively analyzed in different stages. The m-values of two typical superplastic sheetmetals, ZnA122 and ZnA14Cu, were measured by means of bi-specimen and theoretical calcula-tions basically agree with experimental results. The abnormal phenomena of why m_v canbe a negative value and why m_h, m_p and m_v are different are clarified theoretically.
The functional relations between the constant-height bulging m_h value, constant-pressurebulging m_p value and constant-velocity bulging m_v have been established on the basis of them-value definition of superplastic bulging, using equivalent stress, equivalent strain andequivalent strain rate of superplastic bulging as well as the analytical expressions of them-value for free bulging in a few typical loading paths. To non-work hardening, workhardening and work softening materials, the relationships between m_h, m_p and m_v have beenquantitatively analyzed in different stages. The m-values of two typical superplastic sheetmetals, ZnA122 and ZnA14Cu, were measured by means of bi-specimen and theoretical calcula-tions basically agree with experimental results. The abnormal phenomena of why m_v canbe a negative value and why m_h, m_p and m_v are different are clarified theoretically.
基金
Project supported by the National Natural Science Foundation of China.
