Structure from Collision
Sphere
Concents
Results
Experiment I: Influence of cavity size
(2) \( s_c = \left( \frac{1}{2} \right)^3 \)
(3) \( s_c = \left( \frac{2}{3} \right)^3 \)
(4) \( s_c = \left( \frac{3}{4} \right)^3 \)
Experiment II: Influence of cavity location
(1) \( l_c = \text{left} \)
(2) \( l_c = \text{right} \)
(3) \( l_c = \text{up} \)
(4) \( l_c = \text{down} \)
Experiment III: Influence of material
Experiment III-i: Elastic materials with different Young's moduli
(1) \( \hat{E} = 2.5 \times 10^5 \)
(2) \( \hat{E} = 5.0 \times 10^5 \)
(3) \( \hat{E} = 1.0 \times 10^6 \)
(4) \( \hat{E} = 2.0 \times 10^6 \)
(5) \( \hat{E} = 4.0 \times 10^6 \)
Experiment III-ii: Elastic materials with different Poisson's ratios
(1) \( \hat{\nu} = 0.2 \)
(2) \( \hat{\nu} = 0.25 \)
(3) \( \hat{\nu} = 0.3 \)
(4) \( \hat{\nu} = 0.35 \)
(5) \( \hat{\nu} = 0.4 \)
Experiment III-iii: Various materials
(1) Newtonian fluid (\( \hat{\mu} = 200, \hat{\kappa} = 10^5 \))
(2) Newtonian fluid (\( \hat{\mu} = 100, \hat{\kappa} = 10^5 \))
(3) Non-Newtonian fluid (\( \hat{\mu} = 10^4, \hat{\kappa} = 10^6, \hat{\tau}_Y = 3 \times 10^3 \))
(4) Non-Newtonian fluid (\( \hat{\mu} = 5 \times 10^3, \hat{\kappa} = 10^5, \hat{\tau}_Y = 3 \times 200 \))
(5) Plasticine (\( \hat{E} = 2 \times 10^6, \hat{\nu} = 0.3, \hat{\tau}_Y = 1.54 \times 10^4 \))
(6) Plasticine (\( \hat{E} = 10^6, \hat{\nu} = 0.3, \hat{\tau}_Y = 3.85 \times 10^3 \))
(7) Sand (\( \theta_{fric} = 40^\circ \))
