Abstract
In accordance with two different methods, we shall first prove that the dynamic stress intensity factor of mode I of an infinite sheet with a central crack propagating at constant velocity is independent of material constants and the uniform velocity. Then, we may give the general solutions to the more complicated problems of an infinite plate weakened by an infinite series of doubly periodic cracks moving at constant velocity under concentrated forces P and Q in this paper. Of course, the dynamic stress intensity factors of them are also independent of material constants and the uniform velocity. It is clear that the conclusion † † It has been found from only a central crack of mode III in an infinite plate in the past[4]. should be very valuable for designers and experimenters.
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