Table 1 Contact parameters between particles.

From: Study on digging form of mechanized harvesting of Cyperus esculentus and optimization test of device parameters

Material

Static friction coefficient

Rolling friction coefficient

Crash recovery coefficient

Cyperus esculentus grain—Cyperus esculentus grain

0.47

0.05

0.43

Cyperus esculentus granules—soil

0.45

0.09

0.38

Cyperus esculentus grains—Cyperus esculentus stems

0.54

0.10

0.38

Cyperus esculentus granules—Cyperus esculentus root

0.47

0.09

0.40

Cyperus esculentus granules—steel plate

0.46

0.09

0.46

Soil—Soil

0.47

0.08

0.55

Soil—Cyperus esculentus stem

0.49

0.10

0.36

Soil—Root

0.46

0.09

0.53

Soil—steel plate

0.55

0.10

0.43

Root—root

0.48

0.09

0.40

Root—stem of Cyperus esculentus

0.49

0.08

0.36

Root—steel plate

0.46

0.08

0.46

Cyperus esculentus stem—Cyperus esculentus stem

0.50

0.07

0.40

Cyperus esculentus stem—Steel plate

0.50

0.07

0.54

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