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45. <p class='Body'>Variation in size and shape of physogastry of Dolichocybe perniciosa (Acari: Dolichocybidae)

Author

Bingrong Ke, Qing-Hai Fan, Lu Zhenghui, Lan Qingxiu, and Jianhua Liao

Subjects
Auricularia, Pleurotus, Ecology, biology, Humidity, biology.organism_classification, Horticulture, Lentinula, Insect Science, Acari, Pleurotus eryngii, Ecology, Evolution, Behavior and Systematics, Agaricus bisporus, Flammulina
Abstract

The formation of physogastry of the mushroom mite Dolichocybe perniciosa (Acari: Prostigmata: Dolichocybidae) has not been well understood. The shape and size of this mite vary dramatically. To evaluate the effects of environmental factors on the formation of physogastry we tested eight species of edible fungi hyphae, five temperatures and five humidity levels on the shape and size of physogastry. Dolichocybe perniciosa only fed on six species of edible fungi, Agaricus bisporus, Auricularia auricula-judae, Auricularia polytricha, Flammulina velutipes, Ganoderma lucidum and Lentinula edodes but failed to develop on the hyphae of Pleurotus geesteranus and Pleurotus eryngii. However, the six species of edible fungi had different effects on the formation and development of physogastry in D. perniciosa. The suitable temperature for the physogastric formation was from 18°C to 28°C at 75±5% RH, and the suitable humidity was from 22% to 92% at 25°C. The width of physogastries was less than 0.85 mm at five temperatures. The majority of physogastries were oblong or cylindrical under ideal temperature (25°C), but globular at a low temperature (13°C). The largest length and the highest length/width ratio were recorded at 25°C. The length and width of the physogastry were less than 4.0 mm and 0.8 mm, respectively, under tested humidity levels. The highest length/width ratio was 8.19 at 65% RH.

Published
2019

47. Delamination formation, evaluation and suppression during drilling of composite laminates: A review

Author

Xinggang Jiang, Daxi Geng, Lu Zhenghui, Xun Li, Yihang Liu, Deyuan Zhang, Jun Cai, and Zhenyu Shao

Subjects
Manufacturing process, Computer science, Delamination, Drilling, Mechanical engineering, 02 engineering and technology, Fiber-reinforced composite, Composite laminates, 021001 nanoscience & nanotechnology, 020303 mechanical engineering & transports, 0203 mechanical engineering, Ceramics and Composites, Formation evaluation, 0210 nano-technology, Literature survey, Failure mode and effects analysis, Civil and Structural Engineering
Abstract

Fiber reinforced composite laminates have been increasingly replacing conventional materials in various manufacturing sectors due to their extremely superior mechanical properties. Usually, mechanical drilling is an important final manufacturing process for composite laminates, whereas drilling of high-strength composite laminates is very challenging and difficult. As the most undesirable damage and challenging failure mode, drilling-induced delamination for fiber reinforced composite laminates is a hot research area of immerse engineering importance. A review on the path towards delamination-free drilling for composite laminates can significantly help researchers improve currently-available cost-effective drilling process and develop high performance drilling process. This review paper summarizes an up-to-date progress in drilling-induced delamination for composite laminates reported in the literature. It covers delamination formation mechanism, delamination quantification methodologies and measurement technologies, delamination suppression strategies (including tool design optimization, drilling conditions optimization and high performance drilling methods). This general review of drilling-induced delamination for composite laminates can be referenced as not only a summary of the current results from literature survey but also future work possibilities, giving the researchers the opportunity to deepen specific aspects and explore new aspects for reaching delamination-free drilling for composite laminates.

Published
2019

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