Answer / karthick

in general a machine has to withstand high vibrations and
shocks and it has to transmit forces to the ground.so
inorder to have shock resistant capacity it has to design
under brittle.

Answer / abhijit

If we see stress/strain diagram for both (ductile and
brittle), the most common region in both is elastic region.

Take ductile material:-
While designing any component we have to consider yield
strength. Not ultimate tensile strength.
It means we are designing for elastic region.

Take Brittle material:-
This is having only elastic region, so we have to design
for this region only.

If we conclude, we have to design a component for an
elastic region, so we can say for both, ductile as well as
brittle.

Answer / krishna

We should consider all types of loads and possiable
failures for design a component.

Answer / harsha

as ductile materials undergo permanent deformation after
elastic limit and brittle materials undergo sudden
deformation at ultimate strength of the material,we can see
that material will be safe until elastic limit in both
cases.so we ultimately design a machine component for
ductile failure considering the factor of safety.

Answer / asutosh

We know that brittle fracture is a sudden fracture .In case of ductile there is plastic deformation before the breaking stress ocuurs.So its better to consider brittle failure while design of machine elements.

Answer / arpit srivastava

It depends on material to material.
Some materials dont have elastic limit, i.e. they undergo
sudden failure like cast Iron.
It also depends on loading conditions, cyclic loading,
creep loading etc. because of which material does not shows
any sign prior to failure.

Hence it cant be taken as hard and fast rule as to design a
machine component. For what type of
failure (ductile or brittle)?

For instance Factor of safety also varies from one
application to other.

:- For any issues, feel free to contact with

arpit_srivastava@3dplmsoftware.com

Answer / kumar suman saurabh

basically machine component design for brittle failure will
surely be safe for ductile mat bcoz in ductile mat stress
conc and fatigue is not as critical as in brittle mat...so
we should design for brittle failure which ultimately will
safeguard a ductile failure but it will add to economy and
fall under overdesign category.

Answer / ankit singh

if the machine component has to withstand fluctuating &
reversed stresses, it should be designed for brittle
fracture..

Answer / aniket thakur

In a Machine Element we Consider Failure such as Tensile(pull) Failure,Shearing Failure,Crushing Failure.We Will Design For Ductile Material .

Hi. I am in High School. I have a very important assignment from school requiring me to interview a mechanical engineer. But I have no idea where to find one. If you are a mechanical engineer, please fill out the questions below. I'd REALLY appreciate it if you'd help me out. Thank You. 1. What got you interested in mechanical engineering? 2. Where do you work? Exactly what is your job? 3. What did you need to study to become an expert engineer? 4. Is there a high demand for mechanical engineers right now? 5. What is your salary? 6. What are some of the main projects that you have worked on in the past? 7. What schools did you attend? 8. How would you describe mechanical engineering? (the definition of mechanical engineering?) 9. How long have you been in the engineering field? 10. From a scale of 1 through 10, 10 being the most, how much do you enjoy your job and why? 11. What do you like most about your job? What do you like least about your job? 12. Was it hard to find a job once out of college? 13. What advice would you give a student planning on entering this career? 14. What is the most important, or helpful, project that you have contributed to? 15. What is your name and email for further contact and as a resource? Please help me out if you can. I will really appreciate it. Thank You Very Much!

0 Answers  

Working Detail of enging?

0 Answers  

What is meant by gray body?

0 Answers  

why the body of the bike considered as earth in case the motorcycle

1 Answers  

tell me about special purpose machines

5 Answers   Infotech, TATA,

Steam turbine (function an parts)

0 Answers   ABC Inc, RRB, Siemens,

what is the ejection system in mould making?

3 Answers   Godrej,

1. What happens when too much cylinder oil is injected in the working cylinder? 2. Is the unit and normal value fuel ratio of an average diesel engine? 3. What is the formula for 1 HP of a two-cycle engine? 4. Name the indicator diagram. 5. What are the 3 parts in indicator diagram? 6. What are the causes of damage of diesel engine exhaust Valve? 7. What are the causes of I.O. high temperature in a diesel engine? 8. What trouble could result if the main engine is using a low grade of fuel? 9. What are the causes of liner high temperature? 10. What happen when too much cylinder oil is injected in the working cylinder? 11. How many lubricating holes are there in cylinder? 12. What are the defects in exhaust valve? 13. How do you control cylinder liner wear? 14. How much is the specific fuel consumption of an average diesel engine? 15. Purpose of lubricator in a large diesel engine. 16. Explain how the cylinder lubrication on main engine is done? 17. Explain the function of cooling water expansion tank. 18. Explain the causes of the exhaust valve leakage. 19. What is the purpose of I.O. circulation before and after starting of engine? 20. Names the valve connected in cylinder head of the engine. 21. Name the safety devices of diesel engine? 22. What is injection tag? 23. Explain how to measure crank web deflection? 24. In a 4 cycle engine the intake valve begins to open at? 25. What causes cylinder liner-wear down? 26. What causes diesel engine to automatically stop? 27. What causes crankcase explosion? 28. What do you call the clearing of air inside cylinder after combustion? 29. What is the circulation of I.O. pump of diesel engine? 30. What causes diesel engine trouble when using heavy oil? 31. What causes turbocharger surging? 32. What pressure is highest L.O. Gravity Head or S.W. of the stern tube circulation 33. What is fuel catalytic cracking 34. Contaminants of fuel oil 35. Crankcase oil mist detector 36. Inspection for intermediate shaft bearing. 37. What are the causes of main engine black smoke? 38. Causes of emergency trip of diesel engine 39. What are the causes if one cylinder in a diesel engine has a high temperature? 40. Explain how the lubricating oil circulates in a diesel engine. 41. What are the causes of damage to propellers? 42. What causes friction in the cylinder? 43. What causes damage to impellers? 44. In a four-stroke diesel engine, In what engine exhaust valve will open? 45. How is propeller fitted in shaft? 46. What valves are fitted in a four-stroke diesel engine? 47. What are the automatic tripping devices of diesel generator? 48. What is the purpose of thrust bearing? 49. What is fuel oil viscosity, specific gravity? 50. What are the causes of low compression in the main engine? 51. What do you measure in the banana and mountain diagram? 52. What is a brake horse power? 53. What are the requirements of a good fuel? 54. What is the purpose of a setting tank? 55. What is the purpose of a turning gear? 56. What is the purpose of starting air? 57. What is the purpose of engine preheating? 58. What is the purpose of air blow? 59. What is the purpose of stern tube? 60. Where can you find thermometers in diesel engines? 61. What would happen if there is air in fuel oil? 62. What type of pump is lubricator pump? 63. What is the purpose of piston rings? 64. The advantage of a controllable pitch propeller? 65. Explain the fresh water cooling system. 66. What are the typical indicator diagrams? 67. What is the trunk type and crosshead type piston 68. What is higher IMP or BHR 69. What is the sensitive part of the liner 70. Discuss how to prepare the M/E in the standby condition 71. Explain how to clean LO 72. Explain the principle of Suizer Fuel oil injection pump 73. What is the volume develop by the piston from BDC to TDC 74. Enumerate some trouble of fuel injection valve 75. Causes of M/E high exhaust valve temperature 76. What is the purpose of scrapper ring 77. What are the items to inspect after cylinder liner is pulled out 78. What resistance the ship encounter when the vessel is at sea 79. What will you do in case of scavenging fire 80. Draw the flow of F.O. diagram from service tank to Main Engine? 81. What are the types of cleaning main engine Turbo Charger blower side? 82. What are the causes of main engine Turbo Charger blower side dirty? 83. Sketch the jacket cooling system? 84. What will cause if you run your engine in critical RPM continuously? 85. What are the properties of fuel oil? 86. What will you check if one cylinder of your engine is not like the others? 87. What do you do when in your duty, ME alarm oil mist detect high density? 88. Classification of bunkers? 89. What is the purpose of increasing the pressure on the F.O. system of the engine? 90. What are the advantages of white metal? 91. What is the use of white metal? 92. What is the cause of cylindrical liner overheating? 93. What are you going to inspect or check when you open the crankcase? 94. Draw L.O. system in diesel engine? 95. What is the specific gravity of F.O. and D.O? 96. What is pour point? 97. What is flashpoint? 98. What materials are used for engine propeller? 99. How fuel oil consumed by medium engine? 100. What is the remedy if due exchanging, valve broke out during engine running operation? 101. At 50 Centigrade (Fuel oil) what is its cast? 102. At 50 Centigrade (Diesel oil) what is its cast? 103. What do you call a piston travel from TDC to BDC? 104. What happened if the exhaust valve is leaking? 105. Why and what cause of leak fuel oil in high pressure pipe of main engine? 106. What device installed in the F.O. system when excess oil return to drain tank? 107. What parameters to be reported when we send lubricating oil for shore analysis? 108. Heavy fuel oil sulfur content and counter measures? 109. What will happen when engine stays in critical speed of 58-65 RPM? 110. What are the causes of L.O. high temperature? 111. How do you detect starting valve leaks? 112. What are the causes of dirty lubricating oil? 113. Identify the parts of indicator diagram? 114. What are the symptoms of broke piston ring? 115. How much pressure on air reservoir? 116. Name the parts of piston through connecting rod? 117. What are the causes of positive and negative propeller slip? 118. What will be the cause of scavenging fire? 119. What will you do when scavenge fire happened? 120. What do you going to observe, when a diesel engine is running? 121. Where is the expansion tank located? 122. How the F.W.C. system of diesel engine circulate? 123. What is mean effective press? 124. Draw a crankshaft and show the parts? 125. What is the lower part of connecting rod? 126. What should you do before you start the engine? 127. When you will install a new piston ring, what will be the position of it? 128. What is max pressure? 129. What are the things to do when approaching the port? 130. What will be the cause of the loose compression in a cylinder? 131. What is the maximum P-max for a cylinder in M/E. 132. What is the indication of leaking starting valve of an engine? 133. What is the thermal efficiency of a diesel engine? 134. What will be the cause of high temperature in one cylinder of D/E?

0 Answers   RRB,

Causes of M/E high exhaust valve temperature

0 Answers   Sun Mark,

Explain the operation of a centrifugal purifier.

0 Answers   RRB,

how many stages in compressor in ge 9 fa gas turbine ?

3 Answers   Applied Power Technologies, DEWA, Wales Interiors,

What is blading efficiency of steam turbines ?

0 Answers   John Deere,