Strain = Extension (m) / Original length (m)
the dimensions of the cylinder would be 2 times greater. We just had a test on this stuff and this was one of the questions.
not otherwise....split half method is one way of determining reliability of your test and Spearman-Brown formula is a technique used to re-calculate the correlation of your test when you split your test items into half.... this means that the result of Spearman-Brown provides you the correlation of your test in full length.
what you do is you divide 100 by the amount the test was out of then times your answer by your mark
The difference in compressive strength is due to the difference between the modulus of elasticity of concrete and that of the steel which is used to apply the compressive force on the concrete. The pressure applies a lateral confinement pressure which is equal to d/3 meaning that for the cylinder, 2d/3 is confined leaving d/3 unconfined whereas for the cylinder 2d/3 is confined means all of the cube is confined. This leads to the cube having a higher compressive strength that the cylinder. For more information, try to read about the triaxial test and the effect of confinement on the compressive strength of soil samples.
When you formulate and test a statistical hypothesis, you compute a test statistic (a numerical value using a formula depending on the test). If the test statistic falls in the critical region, it leads us to reject our hypothesis. If it does not fall in the critical region, we do not reject our hypothesis. The critical region is a numerical interval.
jubo
jubo
jubo
tensile test
see the following questionWhat_the_difference_between_true_strain_and_engineering_strain
To calculate the tensile strength of a steel channel, such as an ISMC 100 channel, you typically need the material properties of the steel, such as its yield strength. The tensile strength can be estimated using a formula like Tensile Strength = Yield Strength x Safety Factor. It is important to refer to the specific steel standards and specifications for accurate calculations.
why the tensile properties of most brittle materials are accessed by transverse bending tests and not ascertain by tensile tests
A sample coupon of the material is made up, usually in the shape of a dog bone per standards of ASTM. The sample is placed into a tensile testing machine such as made by Instron. The sample is grasped at the ends of the dog bone. This machine has a load cell in it, and the machine is commanded to move relative to its fixed base and stretch the sample, resulting in stress and strain of the material. When the material breaks, the tensile strength is noted. The break stress is the strength divided by the area of the sample of the dog bone center section. If you want yield point, this can be obtained also from plots integral with the software of the test set up. If you want to measure tensile modulus, you would need a strain gage device or extensometer . This is not needed for tensile strength only.
yes
E8
A sample is tested using a tensile test machine by loading it in a direction along its axis. The load is measured with a load cell, and when the sample breaks its tensile strength is determined by dividing the failure load by its area.
A tensile test machine is designed to give a straight line pull on a member so that it measures only direct tensile stress given as the force applied divided by the member area