循环载荷下含裂纹损伤板极限承载力性能研究

Study on Ultimate Bearing Capacity of Damaged Plate with Cracks under Cyclic Loading

针对船底板在船舶航行过程中同时承受纵向循环载荷和侧向压力共同作用的情景,运用非线性有限元法对含裂纹板在混合载荷作用下的极限承载性能进行了探讨,研究了侧压大小,裂纹长度和板厚对裂纹板极限承载力的影响.计算结果表明,侧向压力会大幅降低裂纹板的极限承载能力,薄板的承载能力较厚板会下降更多,但下降的速度会越来越缓慢.厚板的承载能力高于薄板,但随着循环载荷次作用数的增加,厚板的承载能力会以更快的速度下降,并有维持该速度下降的趋势.

In view of the combined action of longitudinal cyclic load and lateral pressure during the ship's voyage, the ultimate bearing capacity of cracked plate under combined load was discussed by using nonlinear finite element method. This paper studied the influence of lateral pressure, crack length and plate thickness on the ultimate bearing capacity of cracked plates. The calculation results show that the lateral pressure will greatly reduce the ultimate bearing capacity of cracked plates. The bearing capacity of thin plates will decrease more than that of thick plates, but the speed of decrease will be slower and slower. The bearing capacity of thick plates is higher than that of thin plates, but with the increase of the number of cyclic loads, the bearing capacity of thick plates will decrease at a faster speed and have a tendency to maintain this speed decrease.