فهرست مقالات V-Notch

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  1 - Investigation of The Effect of Notch Tip Radius on Fracture Energy of Charpy in 7075 Aluminium Alloy
  Ali Hossein zadeh Mohammad Reza Maraki Mohsen Sadidi
  In the present study Charpy impact tests on a 7075-T651 aluminium alloy with full size (55×10×10 mm) with different notch tip radius (range of 0.19 to 0.40 mm) were conducted and the fracture energy was measured. The experimental results showed that the rela چکیده کامل

  In the present study Charpy impact tests on a 7075-T651 aluminium alloy with full size (55×10×10 mm) with different notch tip radius (range of 0.19 to 0.40 mm) were conducted and the fracture energy was measured. The experimental results showed that the relationship between the fracture energy (E) and the notch tip radius of the Charpy samples (r) for the tested Aluminium is E=18.052r+1.741. Using this relationship, the Charpy energy can be determined for this Aluminium for any notch tip radius. Fracture surfaces revealed an intergranular failure for base metal in longitudinal direction, that a predominately brittle failure (cleavage) with some insights of ductile characteristics was observed. Moreover, with increasing notch tip radius, cracked particles were observed and some microvoids were nucleated, i.e., ductile fracture. Changes in the primary crack notch cause a change in the stress intensity factor adjacent to the crack tip, where the fracture energy in the Charpy Impact Test is subjected to the primary crack notch. پرونده مقاله
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  2 - Stress Field Analysis of V-Notches with Tip Cracks in a Polymer Material Using Digital Image Correlation
  ن. سلطانی م.ر. یادگاری ا. اشراقی
  In this study, displacement field around v-notches of a poly methyl metha crylate (PMMA) specimen with tip cracks will be analyzed using digital image correlation technique. First intensity factor in combination with in-plane rigid body translations and rotation compone چکیده کامل

  In this study, displacement field around v-notches of a poly methyl metha crylate (PMMA) specimen with tip cracks will be analyzed using digital image correlation technique. First intensity factor in combination with in-plane rigid body translations and rotation components will be determined by linear least squares fitting of the displacement field data to the corresponding relations among stress intensity factor and displacement field. The effect of v-notch angle on the results would be investigated. Experimental results will be compared with those obtained from finite element analysis. Good consistency is shown to exist between the results of two methods. The existence and a measure of a small region (corresponding to the plastic deformation zone in front of the crack tip) is demonstrated which should be excluded in data extraction for digital image correlation post-processing using linear elastic fracture mechanics relations. پرونده مقاله