Analysis of biomechanical properties of juvenile Manila clam for mechanization sowing
LIU Wenbo1, ZHANG Hanbing1,2, LI Xiuchen1,2, ZHANG Guochen1,2, ZHANG Qian1,2, QU Shuguang1, GAO Jingyu1, FAN Bo1, MU Gang1,2*
1.College of Mechanical and Power Engineering (College of China & New Zealand Collaboration), Dalian Ocean University, Dalian; 2.Research & Development Center of Fisheries Equipment and Engineering of Liaoning Province, Dalian
Abstract: The shell length x1, shell height x2, shell width x3 and live body weight w were measured in 133 individuals of juvenile Manila clam Ruditapesphilippinarum with similar size were measured and valuated by path analysis, and repose angles were determined in 1500 individuals of juvenile Manila clam with shell length of 5-10 mm (small size), 10-15 mm (medium size), and 15-20 mm(large size). The static sliding friction coefficient between different sizes of Manila clam (small, medium and large sizes) and contacted plexiglass, PVC, and stainless steel plate of 200 mm×150 mm×5 mm was determined by one end fixed, and the other end elevated. The quasi-static compression rupture force of Manila clam was investigated in an orthogonal test of three factors (clam size, loading speed, and loading direction) and three levels to provide parameters for the design of sowing equipment of juvenile Manila clam. The results showed that there was very significant correlation between morphological traits and body weight traits (P<0.01). Shell length had predominant direct effect and determinacy on weight traits, with interaction coefficient of 0.536, while shell height showed indirectly effects on weight traits, with interaction coefficient of 0.561. The repose angle was found to be increased with Manila clam size, with the maximum value of 39.66°. The larger the clam size was, the smaller the static sliding friction coefficient was, the minimal static sliding friction coefficient (0.26) between large size clam and stainless steel plate. The factors affecting the rupture force of clam were involved in clam size, loading direction and loading speed successively. The loading speed of 0.5 mm/min was observed when the loading direction of the small size clam was Y direction (beak upward and umbo downward), with the minimal counter rupture ability, and the established multiple regression model of rupture force revealed that the rupture force of the juvenile clam was 6.97 N. The findings provide reference with research and design of mechanization sowing and related mechanical equipment of juvenile Mania clam.
2020, Vol. 35 
