SAMPE Journal - March/April 2016 - 13
Feature Article
Table 2. Hydrotest results following two blunt impact damage events at 12,500 psi (86.2 MPa).
Figure 8. Distributed strain along circumferentially embedded sensor over a range of pressures (a) before damage, (b)
after first blunt impact, and (c) after second blunt impact for comparison. 1000 psi = 6.9 MPa.
Following each of the blunt impact damage events
the COPV was pressurized in the hydrotest facility
to measure changes in volumetric displacement as
well as the burst test facility to measure distributed
strain. Results of the two post-impact hydrotests
are presented in Table 2 and distributed strain
measurements are shown in Figure 8 and Figure 10.
Both post-impact hydrotests resulted in negligible
changes in volumetric expansion compared with the
test prior to impact (0.1 % and 0.8 %, respectively).
The distributed strain profiles look similar as well,
and the strain features appear repeatable over the
three pressure cycles.
SAMPE Journal, Volume 52, No. 2, March/April 2016
Figure 9 presents average strain measurements over
the full pressure range for all three pressure cycles,
taken over the center 2 m of the sensor. The strain
varies linearly with pressure, and some apparent
hysteresis appears in the comparison between the
up and down cycles. A portion of this could likely be
attributed to uncertainty in the actual gage pressure
at each test point (estimated up to a couple hundred
psi or 1.38 MPa uncertainty) or thermal effects on
the strain measurement. Filling and pressurizing the
flask introduced some heat into the pressure vessel,
the amount of which slightly varied for each pressure
cycle. Similar measurements in-service could be
conducted within the same temperature range to
negate the need for thermal compensation.
13
Table of Contents for the Digital Edition of SAMPE Journal - March/April 2016
Contents
SAMPE Journal - March/April 2016 - Cover1
SAMPE Journal - March/April 2016 - Cover2
SAMPE Journal - March/April 2016 - Contents
SAMPE Journal - March/April 2016 - 2
SAMPE Journal - March/April 2016 - 3
SAMPE Journal - March/April 2016 - 4
SAMPE Journal - March/April 2016 - 5
SAMPE Journal - March/April 2016 - 6
SAMPE Journal - March/April 2016 - 7
SAMPE Journal - March/April 2016 - 8
SAMPE Journal - March/April 2016 - 9
SAMPE Journal - March/April 2016 - 10
SAMPE Journal - March/April 2016 - 11
SAMPE Journal - March/April 2016 - 12
SAMPE Journal - March/April 2016 - 13
SAMPE Journal - March/April 2016 - 14
SAMPE Journal - March/April 2016 - 15
SAMPE Journal - March/April 2016 - 16
SAMPE Journal - March/April 2016 - 17
SAMPE Journal - March/April 2016 - 18
SAMPE Journal - March/April 2016 - 19
SAMPE Journal - March/April 2016 - 20
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