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 .

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