Multilayer Laminate of Improved Resistance to Fatigue Cracking.
DEPARTMENT OF THE ARMY WASHINGTON DC
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A multilayer bi-metallic laminate of improved resistance to the initiation and propagation of fatigue cracking and fracture is obtained by intimately bonding, alternate sheets of the two metals one of the metals having a modulus of elasticity at least 20 greater than the other metal. Prior to the bonding step the sheets of the stronger metal are stretched so that when they are released after the bonding step they are left in a state of residual tension while the sheets of the weaker metal are left in a state of residual compression. The residual compression in the weaker metal inhibits fatigue cracking of the laminate while the residual tension in the stronger metal has little effect on the crack resistance thereof. Author
- Laminates and Composite Materials
- Metallurgy and Metallography