基于孔洞扩张模型的钢筋延性断裂分析

DUCTILE FRACTURE ANALYSIS OF STEEL REINFORCING BAR BASED ON VOID GROWTH MODEL

摘要:

进行光滑圆棒单调拉伸试验确定HRB400E钢筋力学性能和本构关系，根据钢筋受力特点设计缺口圆棒试件，进行单调拉伸试验，结合有限元数值模拟，校准得到HRB400E钢筋孔洞扩张模型的材料参数η=2.03.进行HRB400E钢筋单调拉伸试验，观察钢筋的延性断裂，基于孔洞扩张模型对钢筋受拉断裂全过程进行数值模拟，得到的钢筋断裂过程与试验结果完全一致，孔洞扩张模型预测的钢筋断裂位移与试验结果吻合较好，最大误差在10%以内，验证了采用孔洞扩张模型进行钢筋延性断裂分析的适用性和准确性.

Abstract:

Tension coupon tests were conducted on HRB400E steel reinforcing bars. Mechanical properties and constitutive relationship of the material were determined. Notched round bar specimens were designed according to the general stress state of the steel reinforcing bars. Monotonic tensile tests were conducted on the notched round bar specimens. The void growth model (VGM) was calibrated for the HRB400E steel reinforcing bar based on the test results and complementary finite element analysis. The material parameter of the VGM was determined to be η=2.03. Monotonic tensile tests were conducted on HRB400E steel reinforcing bars. Ductile fracture of the steel reinforcing bars was observed. The entire fracture processes of the steel reinforcing bars were numerically simulated with the VGM. The fracture processes obtained by the simulation are consistent with the test results. The fracture displacements predicted by the VGM agree well with the test results, with a maximum error within 10%. The applicability and accuracy of the VGM in ductile fracture analysis of steel reinforcing bars were thus verified.