Very high cycle fatigue behavior of nugget zone in AA 7075 friction stir welded joint was experimentally investigated using ultrasonic fatigue testing system (20 kHz) to clarify the crack initiation mechanism. It was found that the fatigue strength of nugget zone decreased continuously even beyond 107 cycles with no traditional fatigue limits. Fatigue cracks initiated from the welding defects located at the bottom side of the friction stir weld. Moreover, a special semicircular zone could be characterized around the crack initiation site, of which the stress intensity factor approximately equaled the threshold of fatigue crack propagation rate. Finally, a simplified model was proposed to estimate the fatigue life by correlating the welding defect size and applied stress. The predicted results are in good agreement with the experimental results.
from #AlexandrosSfakianakis via Alexandros G.Sfakianakis on Inoreader http://ift.tt/2AzP46R
via IFTTT
Εγγραφή σε:
Σχόλια ανάρτησης (Atom)
Δημοφιλείς αναρτήσεις
-
Abstract Kenaf is a multipurpose crop, but a lack of genetic information hinders genetic and molecular research. In this study, we aimed t...
-
As demonstrated by the market reactions to downgrades of various sovereign credit ratings in 2011, the credit rating agencies occupy an impo...
-
Spindle cell/pleomorphic lipoma is an uncommonly encountered benign neoplasm that is usually found in the subcutaneous tissues. Rare cases r...
-
Lichtenstein intervention is currently the classic model of the regulated treatment of inguinal hernias by direct local approach. This “tens...
-
Publication date: Available online 10 February 2017 Source: International Journal of Oral and Maxillofacial Surgery Author(s): S. Sugiyama...
-
ORIGINAL ARTICLES Cyclooxygenase-2 and estrogen receptor-β as possible therapeutic targets in desmoid tumors p. 47 Rasha A Khairy DOI :10....
-
New magnetic resonance (MR) molecular imaging techniques offer the potential for non-invasive, simultaneous quantification of metabolic and ...
-
The parotid gland harbors 85% of all salivary gland neoplasms. Though the majority of tumors are benign, complete surgical resection remains...
-
Facial Nerve Clinic to Provide Comprehensive Personalized Care Newswise (press release) The program will treat patients with facial n...
Δεν υπάρχουν σχόλια:
Δημοσίευση σχολίου