Abstract
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Visual Artifact
A partially charred surface area is found.
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Evaluation
In order to burn away PCB surface material several things must be present:
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(1)
A moist environment for several min at a time.
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(2)
Repeated moist environment episodes in the presence of voltage and current.
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(3)
An external supply of energy for a 1.574 mm thick FR4 laminate in the neighborhood of 39 J for 9 s to ignite and 47 J to sustain a flame for 11 s that is capable of carbonizing the material. For a 1.574 mm thick CEM-1 laminate this can occur with 27 J for 6 s to ignite and 157 J to sustain a flame for 35 s that is capable of carbonizing the material. See experiments #5, #9a and #9b of Chap. 14 for comparative details.
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Reference
Bumiller, E and Hillman, Hillman, Dr. Craig, “Review of Models for Time-to-Failure Due to Metallic Migration Mechanisms”, Last accessed June, 2016, http://www.dfrsolutions.com/uploads/white-papers/Time-to-Failure_Metallic_Migration.pdf
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Small, J.E. (2017). Localized Event Explained-Partially Charred Surface. In: Electronic Control Fires. SpringerBriefs in Fire. Springer, Cham. https://doi.org/10.1007/978-3-319-52845-8_10
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DOI: https://doi.org/10.1007/978-3-319-52845-8_10
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Publisher Name: Springer, Cham
Print ISBN: 978-3-319-52844-1
Online ISBN: 978-3-319-52845-8
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