Reliability design of bolt fatigue strength of hollow axle in cylinder of ball grinder
As to the connecting bolt of hollow axle in cylinder of ball grinder, its failure and stress distribution was analyzed, and its load distribution was calculated. As a result, the calculation method of reliable degree of fatigue strength was obtained. It is proved by an example that the method is reliable and has applying value.
Fatigue behaviour and reliability of extended hollobolt to concrete filled hollow section
The need to provide mechanical connection from one side for the Hollow section 
connection has arisen in a number of fields and has resulted in the development of 
several types of so-called blind fasteners. An experimental blind bolt called the , 
Extended Hollobolt is giving a good behaviour performance in terms of stiffness, 
strength and ductility. The strength performance of this system has been investigated 
under both monotonic and cyclic loading. However, the performance of such 
connections under fatigue loading is still unknown. 
The aim of this study was to investigate the behaviour of blind bolt connection to 
concrete filled hollow section under repeated load. Further aini was to determine the 
reliability of the Extended Hollobolt to concrete filled hollow section. 
The study involved conducting an experimental programme and carrying out fatigue 
life and reliability analysis. The experiment programme tested 52 specimens of bolts 
connected to concrete filled hollow sections where 36 tests involved Extended 
Hollobolt, 10 standard Hollobolt and 6 standard bolts (M16). The test specimens 
were subjected to tensile fatigue load characteristics with varying stress ranges. 
Mathematical methods are used to. analyse the fatigue test data using the normal, 
lognormal and Weibull distributions. Normal and lognormal distributions are more 
suitable. Therefore, statistical analysis procedure proposed by Eurocode for the 
statistical analysis is valid for fatigue test data. Statistical analysis was conducted to 
establish S-N curves and to predict the fatigue life of the proposed blind bolt. This 
was then compared to the normative regulation in Eqocode 3. 
Norashidah Abd Rahman 
Abstract 2012 
The failure mode of the Extended Hollobolt under repeated loading was found to be 
similar with standard bolt, which is a very positive outcome. Statistical analysis of 
fatigue test data showed that the fatigue life of Extended Hollobolt is higher than the 
theoretical design S-N curve which is recommended by Eurocode 3 part 1-9 for the 
standard bolt. However, the actual fatigue life for the standard bolt appears to be 
higher than the proposed blind bolt. A design model for predicting the fatigue life 
using S-N curve for the Extended Hollobolt is proposed. A reliability analysis using 
FORM (First Order Reliability Method) analysis shows that Extended Hollobolt is 
reliable in connections to concrete filled hollow sections where the safety index is 
4.2.
APPLICATION OF SATELLITE PHOTOGRAPHS IN A MORPHOTECTONIC STUDY OF THE CENTRAL ALBORZ, IRAN
This paper introduces a study of morphotectoni c structure in the Central Alborz Basin, Mazandaran province of Iran (about 1200 square kilometer), using Russian KFA-1000 satellite photography and sequential air photographs. The KFA-1000 metric camera has better ground resolution than SPOT and LANDSAT for the whole of the study area. Results are provided from one pair of 30×30 cm. photos, which provided easy interpretation and better results than other data. Areas identified from these images as being of significance were examined in greater detail through the use of aerial photographs (at scales of 1:5000, 1:10000 and 1:60000 were available).