Lightweight and High-Strength Design of an Excavator Bucket under Uncertain Loading

Table 2

Uncertain parameters and corresponding limits.

Parameter	Symbol	Lower limit	Upper limit	Unit
Soil density		1650	2250
Soil internal friction angle		25	35
Soil adhesion		4500	5500
Soil terrain inclination angle		0	0
Soil cohesion		18000	24000
Soil-bucket friction angle		13.3	26.3
Coefficient of earth pressure at rest		0.55	0.55	—