FR4
Tensile Strength
Lengthwise (warp direction?): 40,000 psi
Crosswise: 35,000 psi
Compressive Strength
Flatwise: 60,000 psi
Edgewise: 35,000 psi
Flexural Strength (1/8 in. thick)
Lengthwise: 55,000 psi
Crosswise: 45,000 psi
Modulus of Elasticity in Flexure
Lengthwise: 2.7 Mpsi
Crosswise: 2.2 Mpsi
Shear Strength 19,000 psi
Izod Impact, (ft-lb/in of notch)
Flatwise 7
Edgewise 5.5
No fatigue data.
Source: Modern Plastics Encyclopedia 1986-1987.
If you can get your hands on a later version, you may get some better data.
Joe Felts
-----Original Message-----
From: PAUL BROWN [SMTP:[log in to unmask]]
Sent: Monday, May 31, 1999 8:00 AM
To: [log in to unmask]
Subject: [TN] Under Stress
Hi all,
We are currently modeling the response of some of our PWB's to flexure.
One issue which keeps presenting itself is a lack of a good sources for
the mechanical properties of standard high temp FR4/ copper laminate
boards. Although I realize that such properties are stack-up specific,
does anyone have or know of a ranges for these properties. Of interest
would be: modulus of elasticity (in X, Y, Z), Ultimate tensile strength
(UTS), Ultimate shear stress (USS), Poisson's ratio, creep strain rates,
Endurance limits, ect...... This information is of significant
importance to me and I look forward to what ever input you can provide
me with. Sincerely.................Paul Brown
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