Consider a unidirectional continuous fiber-reinforced composite with epoxy as the matrix with 55% by volume fiber.i. Calculate t
1 answer:
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Answer:
Explanation:
The missing diagram is attached in the image below which shows the deformation map of the Tungsten.
Given that:
Stress level
T = 0.5 Tm
G = 160 GPa
a)
The regulating creep mechanism is dislocation driven, as we can see from the deformation mechanism.
The engineer's recommendation would not be approved because increasing grain size results in a decrease in the grain-boundary count, preferring dislocation motion. The existence of grain borders is a hindrance to dislocation motion, as the dislocation principle explicitly states. To stop the motion, we'll need a substance with finer grains, which would result in more grain borders, or a material with higher pressure. In the case of Nabarro creep, which is diffusion-driven, an engineer's recommendation would be useful.
b)
If stress level reduced to
Cable creep is now the controlling creep mode, which entails tension-driven atom diffusion along grain borders to elongate grain along the stress axis, a process known as grain-boundary diffusion. Cable creep is more common in fine-grained materials. As a result, the engineer's advice would succeed in this case. The affinity for cable creep is reduced when the grain size is increased.
c)
From the map of creep mechanism for
We read strain rate
Therefore,
= 36
Therefore,
=
= 360 cm
Thus, the increase in length = 360 cm
Answer:
Maximum inside diameter is 68.52 mm.
Explanation:
Apply stress formula to calculate inside diameter of the tube. Take the allowable stress for safe design and maximum inside diameter of the steel tube.
Step1
Given:
Outside diameter is 100 mm.
Tensile load is 500 kN.
Allowable stress is 120 Mpa.
Calculation:
Step2
Inside diameter is calculated by the stress formula as follows:
mm
Thus, the inner diameter is 68.52 mm.