Dynamic analysis of cracked thin rectangular plates subjected to a moving mass first is investigated in this paper. To end, the eigenfunction expansion method utilized solve governing equation. For time, intact plate orthogonal polynomials combination with admissible crack functions as composition, are employed formulation, required professional computer programming The proposed approach guaran...

continued on page 4 Design group revamps postal manual Perhaps you’ve received it. If you have an Andrew account, there’s a one in three chance you did. ‘It’ is an e-mail with the subject, “Andrew account password insecure!” that claims your password has been cracked. The message goes on to say that in addition to the risks they pose to personal account security, slipshod passwords are a potent...

Elastic liners are used for in situ repair and retrofitting of pipes as a cost effective alternative to the replacement of damaged parts and sections. In this paper, we studied the role of an elastic liner on the buckling behavior of a cracked cylindrical shell using finite element method. A special meshing scheme that could mimic the stress singularity at the crack tip was employed to model th...

A study of the mechanisms of cracking-induced mistuning in bladed disks is presented in this paper. An analytical model for a bladed disk was formulated using lumped-mass-beams, and a cracked blade was represented by a beam with a through-crack at the root. Local stiffness reduction due to cracking was incorporated using a flexibility matrix method. The dynamic characteristics of the bladed dis...

The diagnosis of cracked tooth is difficult in the early stage because the symptoms are not consistent, and often a crack line is not visible. Early detection and proper treatment of cracked tooth are important because all cracks have the potential to become a split tooth. 1. Be reminded that cracked tooth occurs usually on mandibular and maxillary first molars in patients in their 40s and 50s....

This is the ®rst in a series of two papers generated from a study on net-section-collapse (NSC) analysis of circumferentially cracked pipes. In this paper (part I), a generalized NSC method is presented to predict the maximum moment of a circumferentially cracked pipe with a variable-depth internal surface crack subject to combined bending and tension (pressure-induced) loads. Two sets of equat...

BACKGROUND: A small, non-blinded, RCT (randomised controlled trial) had reported that oral antibiotics reduced the incidence of mastitis in lactating women with Staphylococcus aureus (S. aureus)- colonized cracked nipples. We aimed to replicate the study with a more rigorous design and adequate sample size. METHODS: Our intention was to conduct a double-blind placebo-controlled trial to determi...

A mathematical model of a cracked rotor and an asymmetric rotor with two disks representing a turbine and a generator is uti­ lized to study the vibrations due to imbalance and side load. Nonlinearities typically related with a “breathing” crack are included using a Mayes steering function. Numerical simulations demonstrate how the variations of rotor parameters affect the vibration response an...