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A Strain Controlled Fatigue Tester for Thin Polymer Film Fatigue Testing

IP.com Disclosure Number: IPCOM000247700D
Publication Date: 2016-Sep-28
Document File: 2 page(s) / 56K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a flex fatigue testing machine using a new transmission mechanism that accommodates multiple simultaneously mounted test pieces and individual monitoring.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 99% of the total text.

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A Strain Controlled Fatigue Tester for Thin Polymer Film Fatigue Testing

Dielectric resin cracking is a major reliability concern in organic flip chip packages. Determination of film flex fatigue robustness before building expensive laminate is essential for new electrical material development. The demand for low coefficient of thermal expansion (CTE), low dissipation factor (df) dielectric material, which usually is associated with lower ductility, tends to worsen the laminates' fatigue.

The novel contribution is a flex fatigue testing machine using a new transmission mechanism that accommodates multiple simultaneously mounted test pieces and individual monitoring. This transmission system does not rely on the gravity to stop the motor; therefore, the novel process frees the tester's limitation to conduct pure bending cyclic tests.

To implement the machine:


1. The sample is taped to the roller either with or without weight


2. The vertical movement of the mandrel drives the roller to rotate


3. The metallic lead then moves either toward or away from the proximity sensor for cycle testing

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Figure: Novel method

This new tester can test five samples at the same time, which improves efficiency. The cycle count is done by proximity switches, the signals of which are collected by a data acquisition system programmed with existing software. The process no longer relies on weight to stop the test, which provides the flexibility to run either biased bending...