IEC 62137-3:2011 pdf – Electronics assembly technology – Part 3: Selection guidance of environmental and endurance test methods for solder joints
IEC 62137-3:2011 pdf – Electronics assembly technology – Part 3: Selection guidance of environmental and endurance test methods for solder joints.
C.2.4 Torque shear strength test to a connector
C.2.4.1 Test equipment requirements
It is recommended that the test equipment can adjust the rotation speed and has a scheme to keep the rotation axis perpendicular to the test substrate.
C.2.4.2 Torque shear strength test jig for a connector
Prepare a torque shear stren9th test jig. as shown in Figure C.3. for the torque shear strength test of a connector adjustable to the solder joints of the connector and its shape to reinforce the mechanical strength of the connector. it Is desirable that this covering jig should be litting closely to the connector with minimum clearance to improve the measurement accuracy of the test. Depth, H, of this covering jig should approximately be equal to the height of the connector. Place the covering jig on the Connector mounted on a test substrate.
C.2.4.3 Torque shear displacement rate on a connector
A preliminary test should be made to find an approximate maximum torque shear using an initial specimen. Select the proper displacement rate from the preliminary shearing test of a device to find the rotation speed for the displacement rate so that the maximum torque is attained at a time of several tens of seconds to several minutes for joint failure.
NOTE The displacement isle is not specitied in (his standard but Its iecommended to select a disØacemenl rate in the range 01 0.006 98 ra4s to 0,01 7 5 rads tor the test equipment which can acu5l the speed and also radial speed (rotation rat•)
When the displacement rate is not adjustable, rotate the rotation jig so that the torque reaches the maximum Torque in several tens of seconds to several minutes.
C.2.4.4 Position adjustment of torque shear strength test jig for a connector
The torque shear strength test jig covers vertically over the test substrate and then the jig is rotated slowly for torque shear force see Figure C.3). The rotation axis when applying the torque should be adjusted to the centre of the device mounted on the test substrate. It is advisable to use a holding jig to suppress the possible deviationvibration of the rotation axis.
C.2.4.5 Torque shear strength test failure of a connector
The torque strength test shear jig covers vertically the test substrate and then the jig Is rotated slowly for torque shear force. Care should be taken to keep the torque meter In a vertical position against the test substrate. The rotation displacement rate should be in the range of 0.006 98 rad/s to 0,017 5 rad]s for the test equipment which can adjust the rotation displacement rate. When the equipment Is not capable of setting the rotation displacement rate, rotate the torque shear strength test jig very slowly around the connector by keeping the rotation axis perpendicular to the test substrate until the soldered connection breaks.
This annex describes in detail the monotonic bending strength test given in 7.1.5.
Monotonic bending strength test equipment
Test equipment requirements
Unless otherwise specified in the product specificatlion, the monotonic bending strength test
equipment should be as follows.
The test should be made using the monotonic bending strength test equipment specified in
7.1.5 with following details.
) The machine should be able to push the bending tool at a specified speed to the specified
displacement (maximum of 20 mm). The precision of the displacement measurement
should be土1 % of the indication on the test machine (setting value).
) The machine should be able to measure the force applied to the bending tool and the
displacement with passing time.
Substrate bending jig
The substrate bending jig should be able to support the device with the face down of the
device side of the printed circuit board, by pushing the centre of the substrate down with the
bending tool. Unless otherwise specified by the product specitications, the jig should be as
The structure of the substrate bending jig should be as shown in Figure D.1.
a) Material: The material of the jig should be steel.
NOTE It is recommended to use high srength steel to prevent deformation due to cyclic tsting.
b) Bending tool: The radius of the bending tool should be 5 mm 土 0,2 mm.
c) Supporting jig: The radius of the supporting jig should be 2,5 mm 土 0,2 mm.
d) Distance between supporting jigs: The distance should be 90 mm 土 1 mm.