Answer:
Oil is graded by the Society of Automotive Engineers - B.
Answer:
The complete data and its solution is attached below:
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Here is the full question
A rectangular beam made of ABS plastic ( ) has dimensions b = 20 mm deep and t = 10 mm thick. Loads in the plane of the 20mm depth cause a bending moment of 10 N.m. What is the largest through thickness edge crack that can be permitted if a factor of safety of 2.5 against fracture is required?
Answer:
1.62 mm
Explanation:
The formula for the stress intensity factor (K) for various bending, curves and equation label is expressed as:
where = gross section nominal stress for center cracked plate of ABS plastic rectangular beam and it's given as:
To determine the stress intensity factor K ; we have:
K =
From the table of fracture toughness of polymers and ceramics at room temperature, we selected the fracture toughness of ABS plastics material to be :
So; K =
The largest through thickness edge crack that can be permitted due to bending moment of 10 N.m is :
a =
a = 0.00162 m
a = 1.62 mm
Thus , the largest through thickness edge crack that can be permitted due to bending moment of 10 N.m is 1.62 mm