Hi Sudakar:
No, the tests are not the same because the energy
is not the only parameter. One must consider both
the impact area and the elasticity of the collision.
The ball is 50 mm diameter while the impact hammer is
20 mm diameter.
In some cases, the 20 mm sphere will contact a part
while the 50 mm will not.
The ball is steel while the impact hammer is polyamide,
which will affect the elasticity of the collision and
therefore the energy imparted to the test object.
Furthermore, the impact hammer pre-loads the test object
while the ball does not. This rules out a simple drop
by a a ball.
For most tests, only the energy will affect the results.
If you are performing the test for certification, then
the test must be done exactly according to the standard.
Of course, from a standards point of view, we can discuss
whether or not both tests are necessary.
Best regards,
Rich
On 1/8/2013 6:19 PM, sudhakar wasnik wrote:
Hi Guys,
Can the ball drop test be conducted using impact hammer ?
I do not see any credible reason for not using the impact hammer.
Impact test using impact hammer delivers x amount of Joules energy
upon impact similar to the dropping of steel ball of certain size
from certain height.
Thanks,
Sudhakar Wasnik, MS EE, IES
Apple Inc.
-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society emc-pstc discussion
list. To post a message to the list, send your e-mail to <[email protected]>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html
Attachments are not permitted but the IEEE PSES Online Communities site at
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used
formats), large files, etc.
Website: http://www.ieee-pses.org/
Instructions: http://listserv.ieee.org/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas <[email protected]>
Mike Cantwell <[email protected]>
For policy questions, send mail to:
Jim Bacher: <[email protected]>
David Heald: <[email protected]>
