Advances in strength of materials : selected peer reviewed by Liviu Marsavina

By Liviu Marsavina

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5 0 0 | S m o o t h 2 . 5 0 0 | S m o o t h 2 . 5 0 0 | S m o o t h 2 . r a w - T y p e : 2 T h / T h l o c k e d - S t a r t : 1 0 . 0 0 0 ° - E n d : 7 0 . 0 0 0 ° - S te p : 0 . 0 5 0 ° - S t e p t i m e : 3 . s - T e m p . 4 The X-ray pattern diffraction for Fe70 Cr4 Ni1 Ga4 P13 Si5 C3 rod Cross-section of a bulk rod was etched in a solution of 1% hydrofluoric acid and was examined by optical microscopy (figure 5) and one can observe a smooth and homogeneous surface without spots of corrosion.

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. Wyko NT 9300 computes several surface parameters that provide information about roughness and the surface profile. The roughness is measured without the contact of the surface. This profiler sits on a vibration isolation table.

4b) had been used in project [17] for the analysis of crack behavior in different regions of welded joints (parent metal-BM, weld metal-WM, heat-affected-zone-HAZ), designed on different matching levels (weld metal yield stress higher compared to parent metal – overmatching, lower – undermatching, or only slightly lower – normalmatching for tested steel, 700 MPa yield stress). Standard procedures require multiple testing of same specimen in order to obtain valid results. Since the manufacturing of pre-cracked specimen is costly, and this is also the case with testing itself, it is clear that fracture mechanics tests are rather expensive.

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