Transcription of IPC-TM-650 TEST METHODS MANUAL (D-15)
1 Number Subject Flexural Endurance, Flexible Printed Board 3000 Lakeside Drive, Suite 309S Materials Bannockburn, IL 60015-1249. Date Revision 6/11 E. Originating Task Group IPC-TM-650 Flexible Circuits Test METHODS Subcommittee TEST METHODS MANUAL (D-15). 1 Scope To determine the number of flexes to conductor failure of etched flexible printed board conductor patterns. 2 Applicable Documents None IPC-243-1. 3 Test Specimen The test specimen shall consist of an etched conductor pattern in accordance with Figure 1. A mini- Figure 1 Flexural Endurance Test Pattern.
2 Mum of six specimens with the long dimension of the conduc- (NOTE: Conductors are mm mm [approximately, in . tors oriented in the transverse direction of the base material in] wide on mm mm [approximately, in in]. centers.). shall be prepared using standard commercial practices. For double-sided clad constructions, a separate sample 6 mm 1 mm [approximately, in in] and connect specimen shall be prepared for each side. The opposite the two wires to the relay. The horizontal oscillation of the (untested) side shall be completely etched of copper.
3 Reciprocating bar causes the flexible test specimen to move in what can be described as a rolling, flexible action. 4 Apparatus Flexural Endurance Tester (see Figure 2) or equivalent. Test three specimens per clad side with the conductor 5 Procedures on the inside of the loop. The reciprocating travel should not exceed 10 cycles per minute. The loop shall travel 25 mm . Examine the etched conductor specimen for any pre- 5 mm [effectively, 1 in in]. existing fractures and look for evidence of process anomalies (such as pin holes and nicks), which could cause premature The number of cycles to failure is when electrical discon- fracture.
4 If such fractures or anomalies are found, the speci- tinuity of the conductor occurs. men shall be discarded and a new specimen selected. Report the average number of cycles to failure for the Attach (solder, clamp, etc.) a short length of insulated three specimens tested per clad side. wire to the extreme ends of the conductor pattern of each of the six specimens. 6 Note Master set of drawings of a similar test fixture as seen in Figure 2 is available from the IPC office. This fixture is Using the flexure test equipment as seen in Figure 2, not commercially available.
5 Mount the specimen so that the inside diameter of the loop is IPC-243-2. Figure 2 Typical Flexural Endurance Test Fixture Equipment Material in this Test METHODS MANUAL was voluntarily established by Technical Committees of IPC. This material is advisory only and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this Page 1 of 1. material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.
6 Equipment referenced is for the convenience of the user and does not imply endorsement by IPC.
