EBK AUTOMOTIVE TECHNOLOGY
EBK AUTOMOTIVE TECHNOLOGY
5th Edition
ISBN: 8220100659843
Author: Halderman
Publisher: PEARSON
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Chapter 23, Problem 1RQ

What causes a wedge-shaped film to form in the oil?

Expert Solution & Answer
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To determine

State the reason for the formation of wedge-shaped film in the oil.

Explanation of Solution

Lubrication between two sliding surfaces is due to an oil film that segregates the surfaces and bears the load.

When the oil is placed over a plain surface and a large block is moved across the plain surface, the block will slide easily on the surface compared to moving across a dry surface. The reason is due to the formation of a wedge-shaped oil film between the surface and the sliding block. The wedge-shaped film in the oil makes the block to move easily on the plain surface.

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You design a pin joint. The pin is made of a material with the yield strength of 325 MPa and ultimate strength of 500 MPa. The maximum allowed stress in service is expressed as a tensor 0 100 0 σ 100 0 0 MPa 0 0 Evaluate the safety factor SF for stress in this design. Write answer unitless rounding to 2 decimal places and enter decimals even if those are zeros.
2. A single crystal of aluminum is oriented for a tensile test such that its slip plane normal makes an angle of 28.1° with the tensile axis. Three possible slip directions make angles of  62.4°, 72.0°, and 81.1° with the same tensile axis.  (a) Which of these three slip directions is most favored?  (b) If plastic deformation begins at a tensile stress of σ x = 1.95 MPa (280 psi), determine the critical resolved shear stress for aluminium. (c) If this single crystalspecimen is loaded under the new stress state: σ x =1.2 MPa σ y = -0.8 MPa, and τ xy = 0.6 MPa, howmuch is the resolve the shear stress along the most favored slip direction?
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