By Liviu Marsavina
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Extra info for Advances in strength of materials : selected peer reviewed papers from the Strength of Materials Laboratory at 85 years, 21-22 November 2008, Timisoara, Romania
98 The slope’s plot from fig. 3 represents the fractal dimension of the roughness profile. 98) is valid on the all evaluation length. The measurements taken with the stylus profilometer are more reliable because of the fact that the stylus is in contact with the surface. This method has some disadvantages: absence of the same precision in all the directions and the clearance in altitude which is limited to 1mm. 46 Advances in Strength of Materials Interferometer Light Microscope Our research was carried out on the optical profilometer Wyko T 9300 product by the Veeco Company.
Uncertain quality of welded joint and unpleasant view, both depended on welders knowledge and skill, pressed the customers and producers to define minimum quality level for welded structures, and radiography, that time the only available non-destructive testing (NDT) method for reliable detection of eventual defects was applied. Simultaneously with development of new and improvement of already existing welding processes, the NDT methods were broadly developed and introduced, capable to document detected defects and verify welding quality.
Analysing diagrams in Fig. 6 and 7 we see a small loading difference between registered results for case II and those registered for case III, but, there is a significant crack growth decrease for case IV of loading. This fact shows us that introducing two spread overloads in loading spectre at a certain number of cycles gives a higher crack growth retardation than in case both overloading points are applied consecutive in a loading spectre. The small difference between case II of loading and case III can indicate the fact that the crack growth delay period given by an overload is not much different from crack growth delay period given by two overloads applied consecutively and plastic deformed zone on crack tip induced by an overload point doesn't increase too much when consequently applying the second overload point.