Questions and answers

What is cross head speed?

What is cross head speed?

The specified straining rate converts into an equivalent crosshead speed by multiplying the strain rate by the gauge (parallel) length of the specimen. For example, a rate of 1% per minute on a specimen having 100mm parallel length results in a crosshead speed of 1mm/min.

What is cross head speed in UTM?

Okayama University of Science. Fundamentally, the crosshead speed of UTM has, more or less, an effect on the tensile shear strength of Lap Joint specimens.

What is crosshead in tensile test?

Cross head – A movable cross head (crosshead) is controlled to move up or down. Usually this is at a constant speed: sometimes called a constant rate of extension (CRE) machine. Some machines can program the crosshead speed or conduct cyclical testing, testing at constant force, testing at constant deformation, etc.

What is cross head travel?

A piston rod is attached to the piston and links it to the crosshead, which is a large casting sliding in crosshead guides (UK: slidebar), allowing it only to move in the same direction as the piston travel. In this way, the transverse forces are applied only to the crosshead and its bearings, not to the piston itself.

What is the formula for stress and strain?

stress = (elastic modulus) × strain. stress = (elastic modulus) × strain. As we can see from dimensional analysis of this relation, the elastic modulus has the same physical unit as stress because strain is dimensionless.

What are the objectives of compression test?

Compression tests are used to determine the material behavior under a load. The maximum stress a material can sustain over a period under a load (constant or progressive) is determined. Compression testing is often done to a break (rupture) or to a limit.

Which test can be performed on UTM?

By far the most common tests performed on plastics with a UTM are tensile strength and modulus and flexural strength and modulus. All testing is done in accordance with specific ASTM and /or ISO standards.

How do I use UTM?

  1. Prepare the Specimen as per the ASTM standard.
  2. Mount the Specimen using suitable compression plate.
  3. Calibration the load cell as per the shunt value.
  4. Select the crosshead speed as per required strain rate.
  5. Set the test speed rate & DAQ H2 Speed rate as per the test required.
  6. Test the specimen up to failure.

How can I improve my tensile test?

Tensile Strength

  1. Use hotter mold temperatures.
  2. Use high injection speed.
  3. Avoid high melt temperature.
  4. Injection pressure has little effect.

Which machine is used for compression test?

Get the Best Value Compression Test Machines

Model Type Force Range
639 Family Static Hydraulic up to 3,000 kN (670,000 lbf)
Universal Test Machines
100 Series Electromechanical up to 9 kN (2,000 lbf)
200 Series Electromechanical up to 5 kN (1,125 lbf)

What is a cross head bearing?

n. a sliding member of a reciprocating engine for keeping the motion of the joint between a piston rod and a connecting rod in a straight line.

Why is there no crosshead in a 4 stroke engine?

In four stroke or trunk piston engines the skirt has arrangement for gudgeon pin, which transmits power from the piston to the gudgeon pin or top end bearing. As there are no cross head guides in four stroke engines, these skirts help in transferring the side thrust produced from the connecting rod to the liner walls.