Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (3): 897-902.doi: 10.13229/j.cnki.jdxbgxb20180926

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Compression mechanical properties and fracture mechanism of Scapharca Subcrenata shell

Na WU1(),Jian ZHUANG2,Ke⁃song ZHANG1,Hui⁃xin WANG2,Yun⁃hai MA2()   

  1. 1. College of Automotive Engineering, ShanDong Jiaotong University, Jinan 250023, China
    2. Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130022, China
  • Received:2018-09-12 Online:2019-05-01 Published:2019-07-12
  • Contact: Yun?hai MA E-mail:wuna1978@163.com;myh@jlu.edu.cn

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Abstract:

The clamshell was used as the research object, and three types of clamshells under different water conditions were carried out by mechanical testing machine,including of the fresh, soaked and dry shells.Based on the experimental data of bearing pressure and the crack characteristics and microstructure of shell, the whole bearing pressure characteristics and fracture law of clamshell surface were analyzed. The results showed that the pressure performance of the shell surface is the best in the fresh body. The mechanical properties in soaked bodies decreased because of the loss of the organic matter after the soaking. The compression capacity declined sharply when the shell was dry.The reason was that the water lost in the shell body and the organic matter dried up. the shell crack propagation and shell crack change were different in the three states. This study will provide important reference value for the study of mechanical properties and biomimetic application of shell surfaces.

Key words: engineering bionics, shell surface, load pressure, mechanical properties, fracture mechanism

CLC Number: 

  • TB17

Fig.1

The shell of Scapharca subcrenata "

Fig.2

"

Table 1

Coefficients of bearing load?deformation equations fitted and their evaluating parameters"

方程参数 试验贝壳状态
鲜 体 浸 泡 体 干 体
a 118.05 177.25 86.12
b 1 22270.40 51037.31 25586.46
b 2 1.97 -1.41 -1.87
b 3 -3.83 3.09 4.98
b 4 2.37 -1.76 3.12
R 2 0.9997 0.9998 0.9957

Fig.3

"

Table 2

Relations of mean bearing load and deformations of shell"

承压载荷/N 贝壳承压形变量 /mm
鲜体 浸泡体 干体
200 0.045 0.014 0.178
300 0.085 0.098 0.223
500 0.179 0.184 None

Fig.4

"

Fig.5

External and internal cracks of different states Scapharca subcrenata shells"

Fig.6

"

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