Category: Engineering

Which theory is suitable for ductile materials? Maximum shear stress theory What are the yield function and yield criterion for a general state of stress? The yielding response of materials to three-dimensional stress states is described by the well known yield criteria, the Tresca criterion, where yielding is taken to occur at a critical value […]

How does a caliper parking brake work? There is a cone behind the piston and it moves with the piston when the foot brake is applied. When the parking brake is operated, the brake lever turns the screw on which it is mounted (it also is an an adjusting screw threaded through an adjusting nut). […]

What is positive photoresist and negative photoresist? Positive photoresists are able to maintain their size and pattern as the photoresist developer solvent doesn’t permeate the areas that have not been exposed to the UV light. With negative resists, both the UV exposed and unexposed areas are permeated by the solvent, which can lead to pattern […]

Why does my tractor battery keep dying? An alternator and a voltage regulator are part of the electrical system that recharges a riding mower battery. If the parts failed, replacing them may restore power to the battery the next time you run the mower. As a result, the battery may die between mowings. Why won’t […]

How long does it take to replace CV axle? about 1 hour How long can you drive on a bad CV axle? about five months How much does it cost to replace a CV axle? The average cost for CV axle replacement is between $1,053 and $1,218. Labor costs are estimated between $141 and $178 […]

What is section method? The method of sections is a process used to solve for the unknown forces acting on members of a truss. The method involves breaking the truss down into individual sections and analyzing each section as a separate rigid body. How do you method a joint? The first step in the method […]

How is a string of Christmas lights wired? Christmas lights are wired as a “series” of lights along a single electrical path. There are two wires attached to the base of each bulb socket – one can be thought of as electricity “in” and the other is electricity “out”. The bulb provides the connection between […]

What is the 0.2% offset yield strength ΣY )? The 0.2% offset yield strength (0.2% OYS, 0.2% proof stress, RP0. 2, RP0,2) is defined as the amount of stress that will result in a plastic strain of 0.2%. This is illustrated by the blue line in Figure 1 below. This is the yield strength that […]

What is ACH infiltration? Infiltration measures The air exchange rate is also known as air changes per hour (ACH). ACH is the hourly ventilation rate, divided by the building volume. It can be calculated by multiplying the building’s CFM by 60, and then dividing by the building volume. ( What are heat infiltration losses? OVERVIEW. […]

Why intake valve opens before TDC? Opening the intake valve before TDC can result in exhaust gasses flowing into the intake manifold instead of leaving the cylinder through the exhaust valve. Later intake valve opening can restrict the entry of air/fuel from the manifold and cause in-cylinder pressure to drop as the piston starts to […]