Relaxation of thermal stresses in dissimilar materials (approach based on stress intensity)

The characteristics of thermal stresses near apex in dissimilar materials composed of arbitrary wedge angles under thermal loading are investigated theoretically and numerically. The thermal stresses ~r h (h = rr, rO, 00) near the apex are represented by Khf~- 1, where pj- 1 is the order of stress singularity and Khj indicates the intensity of stress field with j = 1,2 . . . . . n. For the metal/ceramics composite, combinations of the bonded wedge angle, in which Khj becomes zero, are clarified theoretically, and the disappearance conditions of stress singularity from both the order pj and the intensity Khj are examined. Also, classification of the distribution of the intensity Khj which divided into two forms is shown for pl and P2, respectively, on the q~l + ~P2-~Pl plane. © 1997 Elsevier Science Ltd.