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To address the challenge of on-site, non-destructive, and live assessment of the mechanical life of distribution cable outer sheaths, a thermal ageing platform and a hygrothermal accelerated ageing platform were established in this paper, and the evolution law of the compression modulus of PVC sheaths with ageing time and multi-stress coupling effects was systematically investigated. Based on the changing law of compression modulus, an Arrhenius single-stress ageing model and a Peck hygrothermal coupled ageing model were constructed, and the prediction errors of the two models were compared; meanwhile, an on-site sampling scheme with radial and axial multi-point sampling was proposed. The results show that the compression modulus increases exponentially with ageing time, while the elongation at break decreases rapidly. At 120℃, the degradation rate at 60% relative humidity is significantly higher than that at 40% relative humidity, and the humid environment can further accelerate the rigid-to-flexible transition process of the material. Under hygrothermal environments, the Peck hygrothermal coupled model can significantly reduce the prediction errors compared with the Arrhenius model. The error of radial and axial multi-point sampling on the cable can be reduced to 4.1% compared with the traditional specimen testing.
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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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