Accession Number : AD0709036

Title :   THE FATIGUE BEHAVIOR OF TUBULAR CONNECTIONS.

Descriptive Note : Progress rept. Jan 68-Apr 70,

Corporate Author : TEXAS UNIV AUSTIN STRUCTURES FATIGUE RESEARCH LAB

Personal Author(s) : Toprac,A. A. ; Louis,G. B.

Report Date : MAY 1970

Pagination or Media Count : 125

Abstract : This investigation presents the results of an experimental study on the fatigue strength of tubular connections. The specimens tested were T- and K-joints. All specimens had the same chord and brace which were 8 5/8 in. 0.D x 3/16 and 3 3/4 in. 0.D x 3/16 in. respectively. Thirteen T- and eighteen K- joints were tested in this program. However in the analysis of the results previous test programs carried out at the University of Texas were also considered. These previous programs include fourteen T- joints of the same geometry. To investigate whether models can be used to make fatigue studies the above mentioned results were compared to those obtained from a fatigue study of 94 T- joints of 2 1/4 in. chord. The results are presented in the form of S-N curves for T- and K- joints with best fit curves based on regression analysis. Further 90% survival curves are presented for both crack initiation and final failure. The study indicates that small size specimens might be feasible to study. The results of this investigation are compared to research carried on in Japan. The correlation of the results proved to be satisfactory. Conclusions are drawn based on all these studies. (Author)

Descriptors :   (*PIPES, WELDS), (*METAL JOINTS, FATIGUE(MECHANICS)), LOADS(FORCES), CRACKS, CRACK PROPAGATION, FAILURE(MECHANICS), REGRESSION ANALYSIS, STRESSES, STATISTICAL ANALYSIS

Subject Categories : Pumps, Filters, Pipes, Tubing, Fittings & Vlvs
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE