Tensile Test of Fine Wires
Fine wires are widely employed in the microelectronic industry. These wires are most commonly used for forming interconnections between ICs (integrated circuit) and PCBs (printed circuit boards). Most interconnection wires today are less than 50µm in diameter and the mechanical characteristics of these wires are crucial in ensuring proper functioning and reliability of the semiconductor device.
Tensile tests are often conducted to evaluate the wire’s tensile strength, yield strength, and elongation. When testing fine wires, it is often challenging to determine the most suitable test configuration. Grips selected should be able to hold the specimen firmly, without causing any specimen slippage or breaks near the jaws. Since these wires are usually very delicate, clamping pressure and closing speed of the grips must be carefully controlled to prevent any premature failure. Some users attach the test specimen to an aperture card prior to inserting the specimen into the grips. These aperture cards allows for better specimen alignment and easier insertion of specimens into the grips.
A tensile test was conducted on 20µm diameter wire using our 6800 table model electromechanical machine, together with custom 10 N pneumatic side acting grips and Bluehill® Universal Software. The wire specimen was attached to an aperture card and clamped by the grips. The two vertical sections of the aperture card were then cut before starting the test. As the load readings are very low, it is recommended to use a load cell of capacity 10 N or lower. To maximize the working range of the load cell, it is best that the weight the grip does not exceed 50% of the load cell capacity. Our custom pneumatic grips are lightweight and the jaw faces feature a special coating to minimize slippage and breaks within the jaw faces. The low load readings also imply that the test results are highly sensitive to surrounding conditions. For this reason, to obtain accurate results, it is critical that the test area be free of external sources of error such as vibration and wind.
Instron 6800 Series Universal Testing Systems provide unparalleled accuracy and reliability. Built on a patent-pending Operator Protect system architecture with an all-new Smart-Close Air Kit and Collision Mitigation features, the 6800 Series makes materials testing simpler, smarter, and safer than ever before.
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Bluehill Universal Software is built from the ground-up for touch interaction and an intuitive user experience. Discover simpler and smarter testing with features such as pre-loaded test methods, QuickTest in seconds, enhanced data exporting: and Instron Connect – a new feature that provides a direct communication link to Service. Users of previous versions of software such as Bluehill 2 and Bluehill 3 can easily upgrade to the newest version of Bluehill.
- 4.4 MB