1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Salsk061 [2.6K]
3 years ago
11

Although the viscoelastic response of a polymer can be very complex (time-dependent stress cycling for instance), two special lo

ading scenarios are fairly simple to describe mathematically.
_____________refers to scenarios for which the stress applied to a polymer must decay over time in order to maintain a constant strain. Otherwise, over time, the polymer chains will slip and slide past one another in response to a constant applied load and the strain will increase (in magnitude).
_____________refers to scenarios for which a polymer will permanently flow over time in response a constant applied stress.
Engineering
1 answer:
Olin [163]3 years ago
8 0

Answer:

Viscoelastic stress relaxation

Viscoelastic creep

Explanation:

  • Viscoelastic stress refers to the reduction of tensile stress with the relaxation time that occurs when the body is kept at a certain length under tensile stress. The purpose of this study was to demonstrate viscoelastic stress relaxation
  • Therefore, when the viscous tension stress occurs, the pressure decreases due to the steady-state stress of the phases.
  • When under constant pressure, the viscoelastic material experiences a time-dependent increase in pressure. This phenomenon is called viscoelastic creep.
  • Therefore the phase constant pressure decreases when there is relaxation in the viscoelastic stress

You might be interested in
Consider the 'scope trace showing the input signal to an rc filter (the one having the larger amplitude) and the output of the f
yulyashka [42]

The corner frequency of this filter in hz is Directly switched the documents to one-of-a-kind Cloud Multi-Regional Storage bucket places in US, EU, and Asia the usage of APIs over HTTP(S).

<h3>What is Multi-Regional Storage?</h3>

It is geo-redundant, this means that Cloud Storage shops your information redundantly in as a minimum geographic location separated via way of means of as a minimum one hundred miles in the multi-local vicinity of the bucket.

Multi-Regional Storage is suitable for storing information this is often accessed ("hot" objects), along with serving internet site content, interactive workloads, or information helping cell and gaming applications. Multi-Regional Storage information has the maximum availability as compared to different garage classes.

Read more about the amplitude:

brainly.com/question/413740

#SPJ1

6 0
2 years ago
Give the approximate temperature (in K) at which creep deformation becomes an important consideration for each of the following
andrezito [222]

Answer:

691K, 543K, 725K, 1473K, 240K, 373K

Explanation:

Creep deformation of any metal is the transformational tendency of a metal to distort rapidly or slowly when attacked by any form of mechanical stress. The temperature significant for a metal to deform is gotten by the division of the actual temperature of the metal by its melting point. This is termed homologous temperature which is 0.4 or higher. It is calculated by the equation:

0.4Tm

Therefore for the listed metals...

For Nickel, 0.4Tm = 0.4 ×(1455 + 273) = 691 K

For Copper, 0.4Tm = 0.4 ×(1085 + 273) = 543 K

For Iron, 0.4Tm = 0.4 ×(1538 + 273) = 725 K

For Tungsten, 0.4Tm = 0.4 ×(3410 + 273) = 1473 K

For Lead, 0.4Tm = 0.4 × (327 + 273) = 240 K

For Aluminium, 0.4Tm = 0.4 ×(660 + 273) = 373 K

5 0
3 years ago
A pump is used to extract water from a reservoir and deliver it to another reservoir whose free surface elevation is 200 ft abov
babunello [35]

Answer:

a) the expected flow rate is 31.4 ft³/s

b) the required brake horsepower is 2808.4 bhp

c) the location of pump inlet to avoid cavitation is -8.4 ft

Explanation:

Given the data in the question;

free surface elevation = 200 ft

total length of pipe required = 1000 ft

diameter = 12 inch

Iron with relative roughness ( k/D ) = 0.0005

H_{pump = 665-0.051Q² [Qinft ]

a) the expected flow rate

given that;

k/D  = 0.0005

k/2R = 0.0005

R/k = 1000

now, we determine the friction factor;

1/√f = 2log₁₀( R/k ) + 1.74

we substitute

1/√f = 2log₁₀( 1000 ) + 1.74

1/√f = 6 + 1.74

1/√f = 7.74

√f = 1/7.74

√f = 0.1291989

f = (0.1291989)²

f = 0.01669

Now, Using Bernoulli theorem between two reservoirs;

(p/ρq)₁ + (v²/2g)₁ + z₁ + H_p = (p/ρq)₂ + (v²/2g)₂ + z₂ + h_L

so

0 + 0 + 0 + 665-0.051Q² = 0 + 0 + 200 + flQ²/2gdA²

665-0.051Q² = 200 + flQ²/2gdA²

665-0.051Q² = 200 +[  ( 0.01669 × 1000 × Q² ) / (2 × 32.2 × (π/4)² × 1⁵ )

665 - 0.051Q² = 200 + [ 16.69Q² / 39.725 ]

665 - 200 - 0.051Q² = 0.420138Q²

665 - 200 = 0.420138Q² + 0.051Q²

465 = 0.471138Q²

Q² = 465 / 0.471138

Q² = 986.97196

Q = √986.97196

Q = 31.4 ft³/s

Therefore, the expected flow rate is 31.4 ft³/s

b) the brake horsepower required to drive the pump (assume an efficiency of 78%).

we know that;

P = ρgH_pQ / η

where; H_p = 665 - 0.051(986.97196) = 614.7

we substitute;

P = ( 62.42 × 614.7 × 31.4 ) / ( 0.78 × 550 )

P = 1204804.6236 / 429

P = 2808.4 bhp

Therefore, the required brake horsepower is 2808.4 bhp

c) the location of pump inlet to avoid cavitation (assume the required NPSH=25 ft).

NPSH = (P_{atom / ρg) - h_s - ( P_v / ρg )

we substitute

25  = ( 2116 / 62.42 ) - h_s - ( 30 / 62.42 )

h_s = 8.4 ft

Therefore, the location of pump inlet to avoid cavitation is -8.4 ft

6 0
2 years ago
Which of the following components allows a vehicle's drive wheels to revolve at different speeds while cornering? A. Clutch B. T
nalin [4]

Answer:

C.Differential

Explanation:

While vehicle is moving in a curve track there there is a difference between the speed of inner and outer wheel of vehicle.The inner wheels  move slowly while outer wheels  move faster as compare two inner wheels.Because outer wheels have to cover more distance as compare to inner wheels in the sane time limit.

All above process is carried by using a differential .Differential is a speed changer unit and comes under the picture when vehicle is moving in a curve path.

6 0
3 years ago
Which phrase best describes a safety-critical system?
MAVERICK [17]

Answer:

Life critical systems or computer systems that cause harm to people

4 0
3 years ago
Other questions:
  • Your driver license will be _____ if you race another driver on a public road, commit a felony using a motor vehicle, or are fou
    6·2 answers
  • Consider a steam turbine, with inflow at 500oC and 7.9 MPa. The machine has a total-to-static efficiency ofηts=0.91, and the pre
    14·1 answer
  • Go online and search for information about companies that have been harmed or bankrupted by a disaster. Choose one such company
    11·1 answer
  • Between chain, belt and gear drive, which causes more friction?​
    14·1 answer
  • 4. What are the basic scientific principles the engineers who designed the digital scales would have needed to understand to des
    5·1 answer
  • An ideal gas is contained in a closed assembly with an initial pressure and temperature of
    14·1 answer
  • What should you use to keep battery terminals from corroding
    12·1 answer
  • In-------process the hot drawn bar or rod is pulled through the die.
    7·1 answer
  • Algorithm for sum 2+4+6+….+n
    11·1 answer
  • Explain why it is not advisable to wear Ornament like ring at work shop​
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!