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 ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################ ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################