Damage Accumulation During Stress Relaxation of Polymer Films in Bending

[+] Author and Article Information
D. Ingman, Y. Michlin

Quality Assurance and Reliability, Technion-Israel Institute of Technology, Haifa, 32000 Israele-mail: qadov@tx.technion.ac.il.

J. Electron. Packag 124(3), 260-265 (Jul 26, 2002) (6 pages) doi:10.1115/1.1463731 History: Received October 19, 2000; Online July 26, 2002
Copyright © 2002 by ASME
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Loading scheme of polymer strip. 1-Outer metallic ring; 2-strip in place; 3-inner metallic ring; rc-inner radius of outer ring
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Hypothetical (no external forces) state of withdrawn ring; r-residual radius
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Photo of measuring setup
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Measurement scheme for determination of residual radius: (a) strip with center of residual curvature above it; (b) strip with center of residual curvature below it; 1-Position of strip; 2-hypothetical (no external forces) position of strip
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Stress distribution dynamics
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Experimental values of strip residual radius of curvature r(t) and results of their approximation
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Stress relaxation curve of 36 μm (a) and 50 μm (b) PET film at 295 K
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Stress relaxation factor (SRF) for the data in Fig. 7
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Stress relaxation curve of 36 μm PET film at 333 K
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Stress relaxation curve of 105 μm PES film at 295 K
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Stress relaxation curve of 103 μm PEEK film at 295 K



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