Abstract. Currently, the focus in materials development is on processing of hybrid metal matrix composites (MMC's) in particular aluminum (Al) based owing to their flexibility in achieving tailor made properties. Till date, only processing, characterization of mechanical and adhesive wear behavior of various hybrid MMCs have received much attention. However, solid erosion wear of hybrid MMCs has not yet been reported. This assessment will further enlarge the range of applications of hybrid MMCs in particular for components in operation for military applications especially in desert areas. In the light of the above, the present paper discusses the air jet erosion behavior of developed Al6061-SiC-carbon fibre hybrid composite prepared by combination of powder metallurgy and casting process followed by hot extrusion at temperature of 550 o C using extrusion ratio of 1:4. The solid sand erodent particle size used was 312 µm while the operating pressure and velocity was maintained at 1.4 bar and 30 m/sec respectively. The adopted feed rate of the sand particles was 2.0 g/min with standoff distance being 10 mm. The sample size was 25 mm x 25 mm x 10 mm. The effect of silicon carbide (SiC), Carbon fibre (C f ), test duration and angle of impingement of the erodent on the erosion wear loss of the developed hybrid composite will be discussed at length.
Engineering drawing courses need to address the student's expectations and maintain their interest. The first year engineering students at KLE Technological University undergo a 3 credit laboratory course on engineering drawing i.e. Computer Aided Engineering Drawing (CAED). This course involves manual drawing augmented with learning a drafting tool. Problem-based learning (PBL) approach, a promising new teaching approach which fuels the students learning capabilities is gaining attention of many leading technological universities. This PBL approach is introduced in teaching the CAED and the reactions are studied. Drawing standards and techniques were taught manually. After introducing PBL approach in our course and looking into the learners responses, we see improvement in the interest level of students and also in nurturing the skills required to address the problem. A real-world problem involving a route map was given to the students before teaching the drawing standards and students were asked to solve the problem. After teaching the basic of engineering drawings, the real-world problem was updated to a complex problem. Students provided solution with lot of curiosity and attentiveness. This facilitation of student friendly teachinglearning environment is most desired by any academician. The PBL approach to teach a technical drawing course is quite interesting not only for the learners but also for the instructors. The optimal PBL teaching approaches to these kinds of courses need more careful implementation steps. This small attempt to impart the drawing standards to learners using PBL route is successful looking into their responses to the problems.
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