bulk stress
3.The properties of raw rubber , compounds and vulcanizates of butadiene (Bd)-isoprene (Ip) rubber bulk polymerized with rare earth catalyst (Ln- BIR)were studied . The results showed that there was obvious degradation under the shear stress for Ln-BIRs , and the higher the isoprene content , the more rapid the degration rate .
4.The biaxial modulus and expansion coefficient of BTO films were determined based on the change of stress in BTO films and of the volume of BTO unit cell due to phase transition or the stress slope of BTO films on Si and glass substrates versus temperature plot. The biaxial modulus of BTO film is little higher than that of bulk BTO materials, while the expansion coefficient of BTO films is little lower than that of bulk BTO materials.
5.The cause of construction damage of the bulkhead structure for the 73 000 t panama-max bulk carriers analyzed by CCS′s Rules and Regulations and direct calculation method is that the local working stresses are large than the allowable ones.A resolve plan is proposed of strengthening the corrugated bulkhead,as well as putting up the additional brackets in the lower stool right under the slope plates of the bulkhead in order to reduce the problem of stress concentration due to structural discontinuity.
