Stable crack propagation studies in Ankara andesite

Köksal, Nejdet


Fatigue pre-cracking life estimation for fracture toughness test specimens
Alipour Ghasabi, Amir; Kadıoğlu, Fevzi Suat; Department of Mechanical Engineering (2018)
This study is done for predicting fatigue crack initiation life and propagation life of a crack initiated at a notch and grown to a desired length. Both numerical analysis and experimental study was done for single edge notch bend type specimen. Crack initiation life prediction was done using strain-life approach applying different available models. For this purpose 2-D and 3-D finite element model of the specimen was created in Abaqus. By simulating the 2-D and 3-D model under static loading, notch maximum...
Shear mode fracture toughness of rock with different core-based specimen geometries
Het, Kıvanç; Tutluoğlu, Levend; Department of Mining Engineering (2014)
Shear mode fracture toughness tests on core specimens of gabbro rock were conducted. Tests were conducted under three-point bending and Brazilian type indirect compression load. In order to investigate the reasons for having different fracture toughness values with the different testing methods and geometries, modeling with ABAQUS software was conducted. Stress distributions around the mode II notches were analyzed. In order to assess which specimen geometry results in similar stress distributions as in the...
The effect of loading rate, temperature and crack length on fracture initiation toughness in a low strength steel.
Arıkan, Rafet; Doruk, Mustafa; Department of Metallurgical Engineering (1982)
Analysis of the formability of metals
Koçak, Özgür; Tekkaya, A. Erman; Department of Mechanical Engineering (2003)
Workpieces during cold forging fail basically due to ductile fracture. Ductile fracture can be predicted by damage models. In this study, various damage models such as Cockcroft & Latham, McClintock, Freudenthal, Rice & Tracy, Oyane, Ayada, Brozzo are investigated for their applicability to three workpiece materials: bearing steel (100Cr6), stainless steel (X5CrNiMo1810) and brass (CuZn39). The damage material parameters have been obtained by various tests such as tensile, standard compression, ring compres...
Hot cracking susceptibility of twin roll cast Al-Mg alloys
Tirkeş, Süha; Ankara, Osman Alpay; Department of Metallurgical and Materials Engineering (2009)
Increasing use of aluminum alloys in the automotive industry increases the importance of the production of sheet aluminum. To provide cost effective sheet aluminum to the industry, twin-roll casting (TRC) is becoming more important compared to DC casting. Demand for usage of different aluminum alloys in sheet form introduces some difficulties that should be considered during their applications. The main problem encountered during the welding of aluminum alloys is hot cracking. The aim of this study is to un...
Citation Formats
N. Köksal, “Stable crack propagation studies in Ankara andesite,” Ph.D. - Doctoral Program, Middle East Technical University, 1989.