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Melbourne Testing Services A.C.N. 088 395 153. Unit 1/15 Pickering Road Mulgrave, Victoria 3170, Australia
Telephone: 03 9560 2759, Facsimile: 03 9560 2769, Mobile: 0419 116 733
E-mail: [email protected] Web Site: www.melbtest.com.au
Melbourne
TestingServices
Melbourne
TestingServices
Mechanical Testing
Tensile
Compression
Bend
Shear
Load
Structures
Fasteners
Tensioning & Staying Systems
Structural Bearings
Unit 1/15 Pickering Road
Mulgrave, Victoria 3170
Telephone 03 9560 2759
Mobile 0419 116 733
Page 1 of 5 Melbourne Testing Services Pty Ltd
ABN: 71353261540
The tests reported herein have been performed in accordance with approved Melbourne Testing Services procedures. This document shall not be reproduced except in full.
Melbourne
TestingServices
Melbourne
TestingServices
IN CONFIDENCE TO THE CLIENT
REPORT NO: MT-11/168
IMPACT TESTING OF AN RPS “MFC” (MOTOR CYCLE FRIENDLY) IMPACT FORCE
REDUCTION CUSHION
CLIENT: ROY BULL
RPS INDUSTRIES PTY LTD
4 WILLS STREET
WARRAGUL VIC 3820
DATE OF TEST: MARCH 8TH
– MARCH 9TH
2011
DATE OF REPORT: APRIL 1ST
2011
TEST SYNOPSIS:
A protective Motor Cycle Friendly (MCF) impact force
reduction cushion designed to reduce the magnitude of
impact force from accidental collision with roadside posts
was delivered to the Melbourne Testing Service (MTS)
laboratory for testing.
The MCF cushion was manufactured to fit “Sentryline”
Cable, Barrier-line posts produced by Australian
Construction Products (ACP). The cushion, as seen in
Fig.1, was manufactured from polymeric material and
incorporated a split seam on one side to facilitate ease of
installation onto existing in-situ posts (see Fig.2). Upon
arrival at the laboratory, the test items were examined and
the following details recorded:
RPS-MCF Post Cushion
Height: 490mm
Width: 200mm
Depth: 160mm
Wall Thickness: 50mm
Sentryline Steel Post
Length: 1220mm
Width: 97mm
Breadth: 42mm
Wall Thickness: 3mm
At the request of the client, impact testing was required to determine the energy absorption attributes
of the cushion when fitted to the Sentryline barrier posts. The aim of the testing was to compare the
impact force reduction of posts fitted with the cushion against the performance of an unprotected
steel post as currently used on Australian road networks.
FIG.1
RPS MCF POST CUSHION
Report No: MT-11/168
Page 2 of 5 Melbourne Testing Services Pty Ltd
ABN: 71353261540
The tests reported herein have been performed in accordance with approved Melbourne Testing Services procedures. This document shall not be reproduced except in full.
TEST PROCEDURE:
A rigid steel support frame was constructed to simulate in
ground conditions that would normally occur in typical
roadside installations. The support frame was bolted to the
laboratory test floor and the test posts were telescopically
fitted as shown in Fig.3
Impact testing was conducted by swinging a pendulum mass
weighing 80kg from a range of pre-determined drop heights.
These tests were conducted at three angles to the profile of
the post as follows:
0o (coincident/parallel to the cable orientation)
25o (offset 25
o to the cable orientation)
90o (perpendicular to the cable orientation)
TEST DATA:
Test data curves for RPS-MCF cable barrier posts at a drop
height of 0.9m, equivalent to an impact speed of four metres
per second (4m/s) are provided in Figures 4a to 4c.
FIG.3A
IMPACTOR SETUP FOR MCF CUSHION
POST TEST
IMPACT 0O
TEST SETUP
FIG.2
MCF CUSHION POST
TESTING ASSEMBLY
IMPACT TEST
FIG.3B
MCF CUSHION POST
IMPACT 0O
TEST SETUP
Report No: MT-11/168
Page 3 of 5 Melbourne Testing Services Pty Ltd
ABN: 71353261540
The tests reported herein have been performed in accordance with approved Melbourne Testing Services procedures. This document shall not be reproduced except in full.
TEST OBSERVATIONS:
As can be seen from the test data curves as presented in
Figure 4, the RPS-MCF Impact Force Reduction Cushion
absorbed significant amounts of energy when impacted by
the 80kg mass. The cushion was most effective when the
direction of impact was aligned at zero degrees (0o) or in the
direction of the cable. In this case the impact force was
≈90% less than the force measured when tested against an
unprotected post. As the line impact angle was increased, the
effectiveness of the RPS-MCF IFRC’s impact force
reduction properties, decreased. However, the force
reduction at 90o was still considerable at ≈45%.
COMMENTS:
As can be seen from figure 6 the optimum performance of the
RPS-MCF cushion was recorded between 4 to 5m/s. Tests
conducted at higher speeds indicate that the relative
difference in impact force between un-cushioned and
cushioned posts is lower. This was likely to be due to the
energy absorbed by plastic deformation of the steel post.
However, the pressure exerted on the RPS-MCF cushioned
post is likely to be less compared to an uncovered post due a
larger impact area on the RPS MCF cushion. Subsequently at
higher speeds it is plausible that the impact force resulting on a RPS-MCF cushioned post would be
lower compared to an uncovered post.
FIG.4A
0 DEGREE IMPACT TEST
Without Cushion
With Cushion
0o
FIG.3C
CUSHIONED BARRIER POST
IMPACT 0O
TEST SETUP
FIG.3C
MCF CUSHION POST
IMPACT 0O
TEST SETUP
Report No: MT-11/168
Page 4 of 5 Melbourne Testing Services Pty Ltd
ABN: 71353261540
The tests reported herein have been performed in accordance with approved Melbourne Testing Services procedures. This document shall not be reproduced except in full.
FIG.4B
25 DEGREE IMPACT TEST
FIG.4C
90 DEGREE IMPACT TEST
Without Cushion
With Cushion
Without Cushion
With Cushion
25o
90o
Report No: MT-11/168
Page 5 of 5 Melbourne Testing Services Pty Ltd
ABN: 71353261540
The tests reported herein have been performed in accordance with approved Melbourne Testing Services procedures. This document shall not be reproduced except in full.
FIG.6
25 DEGREE OBLONG POST TESTS AT
PRE-DETERMINED DROP HEIGHTS/IMPACT SPEEDS
IMPACT VELOCITY CONVERSION TABLE
Notes: 1. Melbourne Testing Services (MTS) Pty Ltd shall not be liable for loss, cost, damages or expenses incurred by the client or any other person or
company, resulting from the use of any information or interpretation given in this report. In no case shall Melbourne Testing Services Pty Ltd be
liable for consequential damages including, but not limited to, lost profit, damages for failure to meet deadlines and lost production arising from this report. This document shall not be reproduced except in full and relates only to the items tested.
2. It remains the responsibility of the client to ensure that the samples tested are representative of the entire product batch.
3. MTS shall take no responsibility for the procurement and authenticity of the test product as described herein. 4. This report is specific to the test items in their state at the time of testing. It should not be taken as a statement that all products in all states of
repair, would also perform in the same manner.
5. MTS shall take no responsibility for the interpretation or misinterpretation of the procedures or calculation methods as provided herein or for the appropriateness or validity of the test procedures for the test items described and reported herein.
6. MTS shall take no responsibility for the installation procedures used for the test items as described herein.
7. The tests as reported herein are considered Experimental Type Tests and therefore do not validate or certify the products with any Australian or International standards that may apply.
ROD WILKIE AUTHORISED SIGNATORY
Impact Speed (m/s) 1 2 3 4 5 6 7 8 9 10
Impact Speed (km/h) 3.6 7.2 10.8 14.4 18.0 21.6 25.2 28.8 32.4 36.0
0
2
4
6
8
10
12
14
16
18
20
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Impact Force
(kN)
Impact Speed (m/s)
With Cushion
Without Cushion