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Outline
Kelp is one of the most common large macroalgae in the ocean. Its presence poses a risk of propeller entanglement for ships， deep-sea exploration equipment， and other such assets. During its growth phase， it can be used as a coastal protection material， and after harvesting， it serves as a raw material for food， chemical industry， and other sectors. Therefore， there is an urgent need to conduct hydrodynamic analysis and mechanical research on its damage process. However， there is a lack of accurate mechanical models in relevant studies. In this paper， key mechanical parameters of fresh and mature kelp were measured through experiments. By adopting the method of combining elasto-plastic constitutive model with principal stress failure， a mechanical model for fresh kelp is established based on the ANSYS/LS-DYNA software. The results show that： the shear failure process of kelp is characterized by a transition from local progressive tearing to sudden fracture； comparison between verification tests and simulations reveals a maximum error of 8.248%； elastic modulus， yield strength， tangent modulus， tensile strength， and shear strength exhibit non-linear growth with increasing loading rate， showing a significant strain rate effect； elastic modulus， tensile strength， Poisson's ratio， and static friction coefficient are the key parameters influencing the kelp mechanical model； through application range analysis， the ultimate tensile strength of kelp is 2.445 MPa， and its ultimate shear strength is 0.693 MPa. The kelp mechanical model established by integrating loading rate， elasto-plastic constitutive model， and principal stress failure method provides a certain theoretical basis for research related to the mechanical properties of kelp.
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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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