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In ship and ocean engineering, structures inevitably encounter crack damage due to material defects or microcracks generated during their service time, which causes stress concentration and structural failure. To better simulate the crack propagation behavior of steel members with defects, Q345 steel was taken as the research object in this paper, an improved two-parameter peridynamic (PD) model was proposed based on the PD theory. The internal length effect of long-range forces was considered and the corresponding expressions of coefficient were deduced firstly. Furthermore, the basic form of the constitutive force function of the two-parameter PD was constructed based on the linear and nonlinear mechanical behaviors of the failure process of Q345 steel with defects. The crack propagation behaviors of Q345 steel with different crack distance, length and angle were studied and compared with the experimental results, which verified the accuracy of the present work. Then, the calculation method of fatigue crack propagation under alternating load was given. The research results may provide a reference for the optimization design and failure prevention of steel members in ocean engineering.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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