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Static Loading Vs Dynamic Loading

 
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simran_shahani
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Joined: 26 Jan 2003
Posts: 7

PostPosted: Wed Oct 20, 2004 10:04 am    Post subject: Static Loading Vs Dynamic Loading Reply with quote

In all problems in Dynamics we have the inertial force coming into the picture as the body is in motion. My question is that , even in a static problem , say a cantilever beam subjected to a concentrated load "W" at the free end, won't this inertial force  also act , as the free end displaces from "0" to "Wl3 / 3EI" ??

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PostPosted: Wed Oct 20, 2004 10:06 am    Post subject: Static Loading Vs Dynamic Loading Reply with quote

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PostPosted: Wed Oct 20, 2004 12:12 pm    Post subject: Static Loading Vs Dynamic Loading Reply with quote

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PostPosted: Wed Oct 20, 2004 1:44 pm    Post subject: Static Loading Vs Dynamic Loading Reply with quote

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PostPosted: Wed Oct 20, 2004 4:06 pm    Post subject: Static Loading Vs Dynamic Loading Reply with quote

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mc.upadhyay1
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Joined: 26 Jan 2003
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PostPosted: Thu Oct 21, 2004 11:32 am    Post subject: Static Loading Vs Dynamic Loading Reply with quote

Hello
Only when a body is subjected to some acceleration then it is acted
upon by an inertial force.
when a load is put it displaces the member from zero to a some value but it
does not cause
acceleration of the member.

Regards

Mukesh Upadhyay




simran_shahani@ind                                                                                                
iatimes.com                To:      mc.upadhyay@jil.co.in                                                          
cc:                                                                                    
10/20/04 04:09 PM          Subject: Static Loading Vs Dynamic Loading                                      
Please respond to                                                                                                  
general                                                                                                            





In all problems in Dynamics we have the inertial force coming into the
picture as the body is in motion. My question is that , even in a static
problem , say a cantilever beam subjected to a concentrated load "W" at the
free end, won't this inertial force  also act , as the free end displaces
from "0" to "Wl3 / 3EI" ??

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JVCSNL
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Joined: 26 Jan 2003
Posts: 159

PostPosted: Thu Oct 21, 2004 2:42 pm    Post subject: Static Loading Vs Dynamic Loading Reply with quote

Hello Simran,

In the example you cited, the deflection of cantilever beam is due to
force applied at free end.  Note that, the deflection value is not
changing rapidy with time and hence, rate of change of displacement
(Velocity) and further,  rate of change of velocity (Acceleration) is
almost zero.  The deflection at free end is almost same all the time as
long as the load is acting at free end.  The variation of deflection
along the span is due to the bending stiffness of the member and does
not change significantly with time and can not be considered as the body
in motion.  For a body to be considered in a motion, the displacement
should vary rapidly with time.

In the problems of dynamics, the displacement at any point within the
body varies with respect to time (due to vibrating condition), hence the
acceleration will be non-zero value.    Note that, the inertial force
will be generated due to the non-zero acceleration produced during
vibration condition based on the mass acting during vibration.  

In summary, in the static loading, the load and displacement does not
vary much with respect to time and does not produce time varying
effects.  Whereas in dynamic loading, load or displacement or both are
likely to vary significantly with time producing motion of the body.

Hope this clarifies the difference between static and dynamic loading.

Regards,

Jignesh Chokshi




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Quote:
Quote:
Quote:
mc.upadhyay@jil.co.in 21-10-2004 >>>
Hello
Only when a body is subjected to some acceleration then it is
acted
upon by an inertial force.
when a load is put it displaces the member from zero to a some value
but it
does not cause
acceleration of the member.

Regards

Mukesh Upadhyay





simran_shahani@ind                              

iatimes.com                To:    
mc.upadhyay@jil.co.in                                                

cc:                  

10/20/04 04:09 PM          Subject: Static
Loading Vs Dynamic Loading                                      
Please respond to                                

general                                          








In all problems in Dynamics we have the inertial force coming into the
picture as the body is in motion. My question is that , even in a
static
problem , say a cantilever beam subjected to a concentrated load "W" at
the
free end, won't this inertial force  also act , as the free end
displaces
from "0" to "Wl3 / 3EI" ??

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