Study on the growth process and attachment strength of marine-fouling barnacles
Studying the adhesion strength of marine-fouling barnacles in different growth cycles can provide a basis for scientifically formulating barnacle removal specifications and designing related mechanical equipment.In this study,the growth process of barnacles was observed through barnacle immersion in a sea on Diaoshun island(21°31′N,110°41′E)in Zhanjiang,and the shear strength of the barnacles at different growth periods was measured using a self-designed shear test device.The results showed that the barnacle larvae began to attach to the surface of the sample after 10 d of immersion.Barnacles covered～30％ of the sample surface on day 30,and the barnacle diameter was approximately 1-6 mm,and some barnacles died to form empty shells.On day 60,～50％ of the sam-ple surface was covered with barnacles,and the surface was covered with a film,which aggravated the formation of empty shells,and the largest barnacle diameter was 10 mm.Approximately 95％ of the 90 d sample was covered with barnacles,which overlapped to reach a diameter of 1-13 mm.During the barnacle attachment process,the barnacle shear strength first rapidly increased and then slowly increased with time.A logistic growth model of bar-nacle shear strength change with the barnacle diameter was established,with the determination coefficient R2 = 0.99,which indicates that the model fits well.According to the logistic growth model,the change in barnacle shear strength can be divided into three stages:a rapid growth stage(base diameter 4.0-6.4 mm),slow growth stage(base diameter 6.4-8.7 mm),and gradual stop stage(base diameter＞8.7 mm).The best period of the mechanical removal of attached barnacles was the rapid increase period.
Reticulated barnaclegrowth processexperimental deviceshear strengthlogistic growth model
万方数据
维普
