Four-Point Bend Test in Microelectronics
When testing microelectronic components or populated printed circuit boards (PCBs), the ultimate goal is to decrease the probability of failure, such as crack propagation, delamination, etc. A four point bend test is preferred over a three point bend test due to its ability to spread the most stress over the span of the specimen. Three point bend tests are more suitable when maximum stress concentration is needed in a fixed area, such as a specimen’s midpoint, making this test best when the materials are homogeneous. For stacked packages and finished PCB goods, specimens may not be homogeneous, therefore four point bend testing is a preferred method.
- Various anvil requirements and specimen sizes
- Ability to view cracks or delamination of packages during bend testing
- Several four point bend fixtures are available in a multitude of anvil widths. They feature micrometer screw gauges used to adjust the span length of the upper and lower anvils based on specimen dimensions and application requirements.
- Instron’s TestCam can be used to provide real time data on failures. It is easy to install and can be used at various angles that give the best image results. TestCam communicates with Bluehill® Universal software to indicate images at various points in the response curves.
The 2810-400 flexure fixture allows a variety of flexural tests to be performed, including determination of flexural modulus,flexural strength and flexural yield strength. Easy-to-install, the three-point fixture can be modified with an optional conversion kit to provide a four-point bending conversion
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The 3-Point bend fixture is designed to easily provide the capability of a 3-point flexure test; it is suitable for both Dynamic & Static testing. The specimen is supported on two lower anvils and the load is applied in the centre of the specimen by a single upper anvil. The fixture has a variable span from 15 – 80 mm (0.59 – 3.15 in).
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5900 Universal Testing Systems are engineered for precision, built for durability, and offer the flexibility for changing requirements. They are designed with standard and optional features that increase testing efficiency and improve the testing experience for the operator. A wide range of models are available for testing capacities from < 100N up to 600kN.
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Bluehill® Software TestCam Video Recording and Playback module enables the user to record and replay the actual test event, allowing the operator to examine specific regions and points of interest for materials and components that produce distinct test curves.
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Bluehill® 3 is the newest version of Instron’s widely popular Bluehill Software, designed to meet the demands of any level of user from educators and test technicians to, quality engineers and laboratory managers. Compatible with 5900, 3300 and 5500 systems.
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