Marks) ii) A square bar of 20 mm x 20 mm in section is subjected to a bending moment of 1000 Nmm. Calculate the stress induced in the top and bottom fibres of the bar. What will be stress in the above fibres‚ if the bar is additionally acted upon by a tensile stress of 50 N/mm2 along the axis. (6 Marks) iii) A circular shaft is to transmit a torque of 500 Nmm at a speed of 1000 rpm. Find out the diameter of the shaft‚ if the permissible shear stress in the shaft material is 70 N/mm2. (6 Marks) 12.a)
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Mechanical Engineering CONSULTANCY SERVICE FOR RYOWO (HOLDING) COMPANY‚ LIMITED Uniaxial Tensile Test on SMC Panels by Dr. P.C. Tse (Associate Professor‚ BSc‚ MSc‚ PhD‚ MHKIE‚ CEng) Department of Mechanical Engineering The Hong Kong Polytechnic University Date: 19 April 2006 1 The Hong Kong Polytechnic University Department of Mechanical Engineering Contents (A) Summary (B) Uniaxial Tensile Test and Fibre Mass Fraction Measurement (C) Conclusions 2 The Hong Kong Polytechnic
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Answer. (b). Tube and pipe cross sections can be produced by either direct or indirect extrusion. 9- Which of the following stress or strength parameters is used in the computation of the force in an extrusion operation (one best answer): (a) average flow stress‚ (b) compression strength‚ (c) final flow stress‚ (d) tensile strength‚ (e) yield strength? Answer. (a). 10- In which of the following extrusion operation is friction a factor in determining the extrusion force (one best answer):
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is very tough and durable‚ is then woven in a pattern similar to tiny spiderwebs all interlocked to provide additional strength and durability. Aramid fibres like Kevlar are resistant to wear‚ tear and heat‚ and have no melting point. What is its main use? Kevlar is one of the strongest materials on earth. It is a fiber that when woven together has the five times the strength of steel. It has been in used in many products throughout the years and researchers are still finding new uses for it
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increasing the number of holes to 2 increases the stability of the cable and giving excess strength to the bracket. By using those dimensions below: Length: 250mm Width: 210mm Height: 125mm Thickness: 12mm Thickness of base: 10mm No. of mounting points: 4 No. of holding holes: 2 Diameter of the holes: 65mm each. The proposed design uses high carbon steel instead of low carbon steel‚ this increase strength and rigidity of the compacted bracket design. The composition of high carbon steel
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Purpose This experiment was intended to make students familiar with some common methods of mechanical testing. The laboratory sessions included mechanical testing such as Rockwell hardness testing‚ the tensile test‚ the Charpy impact test‚ and the Jominy end-quench test. Materials and Methods For the first method of this experiment‚ the Rockwell hardness testing of brass‚ the TA prepared three different types of brass for testing. (Free machining cartridge brass: 360 brass 70% Cu – 30% Zn)
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working conditions in service. 3. The cost of the material. 4. Its susceptibility to corrosion. 5. Its physical‚ chemical as well as thermal stability. 6. Material must withstand service demands. Such as dimensional stability‚ adequate strength‚ toughness‚ thermal conductivity etc. 7. The extent of the stresses induced. 8. Factor of safety desired. 9. The initial stresses during the material processing. 10. Its density‚ melting point‚ boiling point at the working conditions
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current automotive industry. The review of vehicle crash began with anatomy of passenger’s impact‚ followed by front crash analysis of steel and aluminum bumper to explain the process of the energy absorbing during a crash. Due to the weight and strength factors‚ composite material is developed to replace the steel and aluminum bumper. The next element in the chapter is the driver impact analysis including composite bumper subjected to rigid wedge. Before ending the review‚ introduction of LS-DYNA
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static and fatigue tests were manufactured by sandwiching the carbon fibres between upper and lower plastic plates made by 3D printing and by heating the sandwiched plates. The fatigue and static strengths were increased by thermal bonding of the plastic plates and carbon fibres. In addition‚ the strengths were heightened by including the carbon fibres in molten plastic. Keywords: 3D printer; CFRP; Dieless forming 1. Introduction The price of 3D printers drastically decreases due to the development
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BENEFITS OF USE OF HIGH (YIELD) STRENGTH DEFORMED BARS IN R.C.C. STRUCTURES 1. Following materials are used in the R.C.C. structures:- (1) Cement (2) Steel (3) Sand (4) Aggregates (5) Water 2. Different types of steel bars used in R.C.C. works are mentioned below: 1) Mild Steel plain bars (Generally M.S. round bars are used) 2) Medium Tensile Steel bars 3) High yield strength deformed bars (H.Y.S.D. bars) 1. Mild Steel Bars (M.S. Bars)
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