Study on Solidification Behavior of Aluminium alloy ( LM 6 ) Castings by using Computer aided Simulation software
Method layout of a casting is an important aspect of tooling development. It involves decisions regarding part orientation in mould, parting line, cores, cavity layout, feeders, neck and gating system. An improper method layout leads either poor quality or low yield, which affects the productivity. Method design is mostly carried out manually, using 2D drawing of the cast part. Then tooling is fabricated the sample castings are produced to 3-4 trials which involves lot of production cost in the from of wastage of manpower, time and hamper the day to day schedule of the particular production. Computer simulation provides a clear insight regarding the location and extent of internal defects, ensuring casting are right as first time and every time. In the present study plate castings were considered to study the solidification behavior of Aluminium Alloy (LM6) at different sizes of riser and riser neck. The VEM based casting simulation software is used to study the solidification behavior of above castings. The simulated results were compared with the experimental results. It is expected that this work will be of immense importance equally to the academicians as well as to the industrial methoding engineers.
Wear Behavior of LM 6 – Borosilicate Glass Reinforced Metal Matrix Composite
The work focuses on the fabrication of aluminium based metal matrix composite and then studying its mechanical properties such as tensile strength, compressive strength hardness and wear behavior of produced test specimen. Wide application of the metal matrix composite is mainly depends on the cost of production. In the present study a modest attempt has been made to develop aluminium based MMC reinforced with borosilicate glass, which is usually a waste material from chemical laboratories. The matrix material selected for the production of MMC is aluminium 12% silicon eutectic alloys which is also known as LM 6. For the homogenous distribution of reinforcement particles stir casting method is selected and the test specimens are prepared as per the ASTM standards. Experiments are conducted by varying the % addition of borosilicate glass from 2.5 to 10 %. The result shows that the tensile and compressive strength of the composites increases as the increase in the % addition of borosilicate glass and reaches maximum at 7.5% addition of reinforcement. The addition of borosilicate glass improves the wear behavior of the matrix material which is the main drawback of LM6.
Euthanasia — again: “Letting die” is not in the patient's best interests: a case for active euthanasia
Recent discussions in the Journal on the subject of euthanasia have relied on intuitive appeals to distinctions traditionally considered to be morally relevant, such as the distinction between acts and omissions (or killing and letting die), or ordinary and extraordinary means of treatment. These discussions remained inconclusive. However, the question of euthanasia no longer remains inconclusive if one adopts the perspective suggested by the United States President's Commission for the Study of Ethical Problems in Medicine and Biomedical and Behavioral Research and by the World Medical Assembly – that a doctor should act in his or her patient's best interests. From this vantage point, it is argued, there will be instances when active euthanasia is the proper cause of action.