Determining the strain due to an applied field, and the polarization due to an applied stress in direct and converse piezoelectric effects. Attachments in MS Word.

A piezoelectric material in the form of a rectangular bar has the dimensions a, b, c, and piezoelectric modulus d(ij)(provided in matrix form in the solution attachment). 1) Find the new dimensions of the bar if an electric field, E is applied along the X₂ axis. Will it remain rectangular? 2) Suppose a shear stress of sigma is applied about the X₃ axis. Determine the magnitude and direction of the polarization.

This is a problem related with the design of demineralizer for the Boiler water treatment, using ionic resins for ionic charge removal

This is a problem related with the design of demineralizer for the Boiler water treatment, using ionic resins for ionic charge removal

Difficulty for solving a problem relating to a truss

How can I solve this problem below by the method of section. Because when I made a section, I always found 4 unknown for 3 equations of equilibrium. Below there are the asking problem plus the answer relating to it for verification, and finally a drawing file attached. Note: The little circle represent the joints between members on the drawing. Note: The drawing file is in word97 format for PC and not for MAC. The asking problem: The diagonal members in the center panel of the truss shown are very slender and can act only in tension; such members are known as counters. Determine the force in member DE and in the counters which are acting under the given loading. The answers of t... click for more

Working with boiler suspension bolts.

An HRT boiler is 4766mm long and 3533mm in diameter. It has 66 steel tubes with a diameter of 9mm. The total dry weight of the boiler is 2.565 tonnes. 4 bolts are to suspend the boiler. If each bolt has to be strong enough to support 1/2 the weight of a filled boiler, what will be the diameter of the bolts? Note: each bolt must not exceed 86 MPA.

Difficulty over a problem of friction about sleeve

How can I solve this problem below: The asking problem: A safety device used by workers climbing ladders fixed to high structures consists of a rail attached to the ladder and a sleeve which may slide on the flange of the rail. A chain connects the worker's belt to the end of an eccentric cam which may rotate about an axle attached to the sleeve at C. Determine the smallest allowable common value of the coefficient of static friction between the flange of the rail, the pins at A and B, and the eccentric cam if the sleeve is not to slide down when the chain is pulled vertically downward. Note: I included the sleeve drawing with this file. The problem was taken from a book, so I had a... click for more