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Subject:
Re: Mechanical Reliability Test Methods
From:
Tegehall Per-Erik <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 21 Oct 2003 08:23:06 +0200
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Jim, Werner,

Actually, there is a standard for ball shear test, JEDEC JESD22-B117, "BGA Ball Shear". It can be downloaded free of charge from JEDECs webpage. They must have listen to you Werner when they wrote it because it defines acceptable failure modes but not acceptable shear force.

Per-Erik Tegehall
IVF, Sweden

-----Ursprungligt meddelande-----
Från: Werner Engelmaier [mailto:[log in to unmask]]
Skickat: den 20 oktober 2003 17:20
Till: [log in to unmask]
Ämne: Re: [TN] Mechanical Reliability Test Methods


Hi Jim,
>Are there any sort of industry standards which define the following tests:
>    a. three point bend test
No
>    b. four point bend test
Not yet, 6-10d is working on it together with JEDEC. There likely will be
separate TMs for "Monotonic Bending" [purpose is to find 'brittle' interfacial
solder joint failures resulting from low interfacial/metallization strength] and
"Dynamic Bending" [similar to the IEEE CLTF test for the purpose to fatigue
SJs similar to T-cycling--it works to  some degree]
>    c. ball shear test
No, there should not be one, because the strength values are meaningless,
only the failure mode is telling.
>    d. board level torsion test
No, see (c)

Regards,
Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL  32174  USA
Phone: 386-437-8747, Fax: 386-437-8737, Cell: 386-316-5904
E-mail: [log in to unmask], Website: www.engelmaier.com

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