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The additional strengthening effect caused by the non-proportionality of loading-path under cyclic loading is an important factor that shortens fatigue life of material. To solve this issue, the plane of maximum shear strain amplitude was treated as the critical plane, and the non-proportionality of material and loading-path were both considered. A new non-proportionality factor was introduced to quantify the impact of non-proportionality loading on fatigue life of material based on the equivalent strain model and critical interface theory. Secondly, the damage mechanism and fatigue failure mode of the specimen were also considered, the maximum normal stress on the critical plane was adopted to characterize its contribution to fatigue failure. On this basis, a multiaxial fatigue life prediction model was proposed by combining the non-proportional factors. Finally, the proposed model was verified by using the fatigue test data of four materials under multiaxial loading, and the prediction results were compared with five proposed models. The results show that the proposed model can effectively improve the fatigue life prediction accuracy under non-proportional loads compared with the existing models.
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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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