Flood geoenvironmental disaster preventive measures in water sheds area of Ambasamuthiram town by using GIS and multicriteria technique

Dec 2017 / by M. SEENIRAJAN, M. NATARAJAN, R. THANGARAJ and E. KAVITHA

In this fast technically developing world it has been difficult to avoid disasters which are occurring periodically despite the scientific reasoning and technical supports. Recent events have fostered the selfish and irresponsible human activities for seasonal floods in India Ambasamuthiram Taluk, Tirunelveli District, Tamilnadu. Flood is a natural disaster almost occurs in every part of the world. India has longest rivers passing from high population density area. During monsoon season, cyclone floods are usually happen in India. Many conditions can result in a flood: hurricanes, overtopped levees, outdated or clogged drainage systems and rapid accumulation of rainfall. The recent flood in Ambasamuthiram was unexpected and not triggered by the above factors. Sometimes floods occur when the watershed size is considerably small which leads to the over flow of water inland. Temporarily used backwater effects in sewers and blocks in local drainage channels and creation of unsanitary conditions may cause flooding. Ambasamuthiram flood was basically claimed to occur due to improper drainage system and underlying strata which was found to be landfill over the ponds and lakes.

Keywords: Analytic hierarchy process (AHP), Geographical Information System (GIS), multi-criteria decision making (MCDA)

Read more

Improving performance of squeeze casting process forADC12 aluminium alloy castings through Taguchi method

Dec 2017 / by K. K. PADMANABHAN and P. SHANMUGHASUNDHARAM

An attempt is made to improve the performance of the squeeze casting process for the production of ADC12 aluminium alloy castings in this study. The prime aim is to experimentally investigate the influence of casting process parameters on the mechanical property hardness. Taguchi’s orthogonal array was used to conduct experiments on samples. It is noted that the squeeze pressure, die temperature and dwell time are the process parameters that make substantial improvement in mechanical properties. The optimum casting condition is found through the Taguchi method and mathematical models are also developed for the process. It is confirmed that the castings prepared for the optimum condition exhibit nearly 40% enhancement in mechanical properties than gravity casting condition.

Keywords: ADC12 aluminium alloy; squeeze pressure; dwell time; Taguchi method

Read more

Mechanical and tribological behaviour of aluminium metal matrix composites – an expatiate review

Dec 2017 / by ARUN PRAKASH J. and P. SHANMUGHASUNDARAM

The potential for aluminium matrix composites (AMCs) is high for various applications due to their physical and mechanical properties. Aluminium matrix ceramic reinforced composites are extensively used in aerospace, automobile and marine applications because of their mechanical and tribological properties. The composites formed out of aluminium alloys are used for their high strength, wear resistance, fracture toughness and stiffness. In AMC, Aluminium is the matrix and the reinforcement is a ceramic or non-metallic hard material which is used to improve the properties of the base metal. This paper attempts to review AMCs effects on mechanical properties like hardness, elongation, tensile, particle size, reinforcement and tribology in addition of different reinforcements in aluminium alloy.

Keywords: AMC, particle size, hardness, reinforcement, heat treatment

Read more

Mechanical behaviour of friction stir welded joints of AA5083 with AA6063 aluminum alloys

Dec 2017 / by S. DHARANI KUMAR, S. SENDHIL KUMAR, D. ARVIND and C. SATHYANARAYNAN

Aluminum alloy finds its applications in automobile, aeronautical and marine engineering. This paper discusses the mechanical characteristics of butt weld joints of aluminium alloy AA5083 along with AA6063. An experiment was conducted for different tool rotational speeds 600 rpm, 800 rpm, 1000 rpm with 4 kN axial load and welding speed of 40 mm/min. It was observed that friction stir welded (FSW) joints of higher tensile strength, lower flexural strength and lower impact strength with maximum hardness, for the work piece fabricated at 1000 rpm using a high speed steel tool with a cylindrical profile. Result illustrates the better understanding of the effect of tool rotational speed and mechanical properties.

Keywords: Aluminum alloy; tensile strength; impact strength; cylindrical pin profile

Read more

Statistical analysis of self-compacting concrete impregnated with coir fibre

Dec 2017 / by S. PAULRAJ, N. BALASUNDARAM, E. SURESHKUMAR and M. DHARSHNA DEVI

Concrete is a composite materials used widely all over the world. During construction in the industry, the construction materials should be eco-friendly. Self-compacting concrete is an innovative concrete that eliminates the vibration without affecting the engineering properties. It is a flowing concrete mixture with high workability that has the ability to consolidate under its own weight. The advantage of SCC is required less time to place large sections. The hardened concrete of SCC has same engineering properties, has no effect on the setting, durability, and hardening of the concrete. Researcher at the University of Tokoyo, Japan started initially in 1980s, to develop SCC and offset the growing shortage of skilled labour. The distinct advantages of SCC are widely acceptance in japan, Europe and USA. The suitability of local aggregates and rough environment conditions, the reluctance appears in lacking of any supportive evidence. The aim of this study is to make development of self-compacting concrete with mineral admixture-coir fiber. The SCC properties were studied on various percentages of coir fiber. The mineral admixture coir fiber was added in the concrete of 0.25%, 0.5% and 1% by weight of cement and the weight of normal sand 10%,20% and 30% of M-sand and C-sand was replaced . Statistical analysis is also used in this study to obtain various characters of the obtained sample.

Keywords: Composite materials, hardened concrete, SCC properties, statistical analysis

Read more

Vibration monitoring in a nutshell

Dec 2017 / by S. SENDHIL KUMAR and M. SENTHILKUMAR

Maintenance is must for all equipment in an industry. The three major types of maintenance are predictive, preventive and breakdown maintenance. Preventive maintenance is adopted by almost all the industries and could not be implemented because it needs well-organized condition monitoring. In predictive maintenance, the condition monitoring technique will enhance the efficiency and industrial safety. The cost of maintenance also is reduced. This paper presents the concise idea of condition monitoring in a nutshell referring to vibration analysis.

Keywords: Condition monitoring, maintenance, rotorbearing system, vibration

Read more

Feature Articles