Problem (4.2): A lunar soil sampler consists of a tubular shaft that has an inside diameter of 45 mm and an outside diameter of 60 mm. The shaft is made of stainless steel, with a shear modulus G = 80 GPa. In Figure (4.23), the sampler is being removed from the sampling hole by two 150-N forces that the astronaut exerts at right angles to arm DE and parallel to the lunar surface. Assume that the external torque that is exerted by the soil from A to B is uniformly distributed, with magnitude to. (a) Determine the maximum shear stress in the shaft of the sampler tube AC, and indicate the location (s) where it acts. (b) Determine the angle of twist of end C with respect to end A, that is, determine:

Problem (4.2): A lunar soil sampler consists of a tubular shaft that has an inside diameter of 45 mm and an outside diameter of 60 mm. The shaft is made of stainless steel, with a shear modulus G = 80 GPa. In Figure (4.23), the sampler is being removed from the sampling hole by two 150-N forces that the astronaut exerts at right angles to arm DE and parallel to the lunar surface. Assume that the external torque that is exerted by the soil from A to B is uniformly distributed, with magnitude to. (a) Determine the maximum shear stress in the shaft of the sampler tube AC, and indicate the location (s) where it acts. (b) Determine the angle of twist of end C with respect to end A, that is, determine:

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter12: Subsurface Exploration

Section: Chapter Questions

Problem 12.9P

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Problem (4.2): A lunar soil sampler consists of a tubular shaft that has an inside diameter
of 45 mm and an outside diameter of 60 mm. The shaft is made of stainless steel, with a
shear modulus G = 80 GPa. In Figure (4.23), the sampler is being removed from the
sampling hole by two 150-N forces that the astronaut exerts at right angles to arm DE and
parallel to the lunar surface. Assume that the external torque that is exerted by the soil
from A to B is uniformly distributed, with magnitude to. (a) Determine the maximum shear
stress in the shaft of the sampler tube AC, and indicate the location (s) where it acts. (b)
Determine the angle of twist of end C with respect to end A, that is, determine:
ØC/A = Øc - ØA
D
150 N
125 mm
125 mm
150 N
d. = 60 mm
1.5 m
orbala
Lunar
soil
Colle

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