Durability of material depends on its physical properties and also the geometrical sizes. At tests consider these two factors. For measurement of durability of a wire calculate the area of its cross section and load by means of a dynamometer to a gap. Then divide force measured at the time of a gap into cross-sectional area. For measurement of durability on compression affect with a force a sample before its destruction, then divide force into the area of its influence. In the equipment special devices are also used.
It is required to you
- dynamometer, ruler, caliper, the hardness gage, stamp for measurement of durability.
Instruction
1. Determination of durability to a metal provolokiizmerta diameter of a wire a caliper, transfer it to meters and find the area of its cross section. For this purpose square diameter, increase by 3.14 and divide into 4. Fix a wire on a support and having attached a dynamometer to the lower end, pull until it does not become torn. Record value of force in newtons at the time of a gap. For determination of durability in pascals divide value of force into wire cross-sectional area. (P=F/S). If there is no dynamometer, it is possible to load a wire with cargoes to a gap, and then to determine their weight and to increase it by 9.81. As a result we will receive value of force which led to a rupture of a sample.
2. Durability any obraztsadlya determination of durability of any detail put it on the strong platform (anvil) and on its certain square, whiling away previously it is measured, use force. For this purpose use a special stamp. In such stamp the dynamometer is mounted. After the sample collapses, divide force with which it occurred into the area of impact on a sample. In case at a sample too irregular shape, equip a stamp tip with a special punch and influence them a sample before emergence of a crack. Divide force with which it occurred into the area of a punch.
3. Determination of durability the hardness gage Press the hardness gage sensor to the tested material and lower a spring. It will strike it with the special pin and will determine its durability by force of its impact on the surface of material.