Life prediction and constitutive models for engine hot section anisotropic materials program

This report presents the results of the first year of a program designed to develop life prediction and constitutive models for two coated single crystal alloys used in gas turbine airfoils. The two alloys are PWA 1480 and Alloy 185. The two oxidation resistant coatings are PWA 273, an aluminide coating, and PWA 286, an overlay NiCoCrAlY coating. To obtain constitutive and/or fatigue data, tests were conducted on coated and uncoated PWA 1480 specimens tensilely loaded in the 100 , 110 , 111 , and 123 directions. A literature survey of constitutive models was completed for both single crystal alloys and metallic coating materials; candidate models were selected. One constitutive model under consideration for single crystal alloys applies Walker's micromechanical viscoplastic formulation to all slip systems participating in the single crystal deformation. The constitutive models for the overlay coating correlate the viscoplastic data well. For the aluminide coating, a unique test method is under development. LCF and TMF tests are underway. The two coatings caused a significant drop in fatigue life, and each produced a much different failure mechanism

Clinic laboratory and colposcopic peculiarities of cervical diseases in teenag and young girls with human papiloma virus

The examination of teenage and young girls with cervical diseases was made, 86 girls had human papilloma virus (HPV) and 138 didn’t have it. The investigation proved that the significant risk factors of HPV infection are early beginning of sexual life, polygamic sexual intercourses, the short period between menarche and the beginning of sexual life. High frequency of other sexually transmitted diseases was determined to be associated with HPV, the most dominant combination is CIN I with progressing endocervicitis and simple leukoplakia