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The storm model is a simplified model to describe the random wave loads borne by the ship structures in complex marine environments. This paper proposed an improved Newman model, namely the NPhi model, to consider the load order and interaction effects of storm models, which is based on the Newman model, considering the load interaction effects in Huang’s model and the improved McEvily model. An overload coefficient was introduced into the effective stress intensity factor range to characterize the hysteresis and acceleration phenomena caused by overload. Using the crack propagation program established in this paper, the correctness of the test results using the propagation from multi-level block loading and storm model was verified, and the influence of overload coefficient was studied. Based on the study by the Fatigue and Fracture Technical Committee of the International Ship and Offshore Structures Congress (ISSC), it is shown that the NPhi model has better prediction ability compared to other typical crack propagation models. Additionally, a reasonable overload coefficient value is crucial for the prediction results.
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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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